Compressed air - Energy efficiency - Assessment (ISO 11011:2013)

This International Standard sets requirements for conducting and reporting the results of a compressed
air system assessment (hereafter referenced as an “assessment”) that considers the entire system, from
energy inputs to the work performed as the result of these inputs.
This International Standard considers compressed air systems as three functional subsystems:
— supply which includes the conversion of primary energy resource to compressed air energy;
— transmission which includes movement of compressed air energy from where it is generated to
where it is used;
— demand which includes the total of all compressed air consumers, including productive end-use
applications and various forms of compressed air waste.
This International Standard sets requirements for
— analysing the data from the assessment,
— reporting and documentation of assessment findings, and
— identification of an estimate of energy saving resulting from the assessment process.
This International Standard identifies the roles and responsibilities of those involved in the
assessment activity.
This International Standard provides indicative information in Annexes B, C, D, and E of the type of
data to be collected to assist in a successful assessment. The information provided is not exhaustive
and therefore is not intended to restrict the inclusion of other data. The form and presentation of the
information given in the annexes is also not intended to restrict the manner of presentation of the
reporting to the client.

Druckluft - Energieeffizienz - Bewertung (ISO 11011:2013)

Air comprimé - Efficacité énergétique - Évaluation (ISO 11011:2013)

L'ISO 11011:2013 fixe les exigences pour obtenir et rapporter les résultats de l'évaluation d'un système d'air comprimé (appelée ci-après «évaluation») tenant compte de tout le système, des entrées d'énergie jusqu'au travail effectué en conséquence de ces entrées.
L'ISO 11011:2013 considère que les systèmes d'air comprimé sont constitués de trois sous-systèmes fonctionnels: une alimentation (offre) incluant la conversion de la ressource d'énergie primaire en énergie d'air comprimé; une transmission incluant le mouvement de l'énergie de l'air comprimé de son lieu de production jusqu'à son lieu d'utilisation; une demande incluant tous les utilisateurs d'air comprimé, y compris les applications d'utilisation finale de production et les diverses formes de consommations perdues d'air comprimé.
L'ISO 11011:2013 fixe des exigences concernant l'analyse des données issues de l'évaluation, le rapport et la documentation des résultats de l'évaluation, et l'identification d'une estimation d'économie d'énergie résultant du processus d'évaluation.
L'ISO 11011:2013 identifie les rôles et les responsabilités des personnes impliquées dans l'activité d'évaluation.

Stisnjeni zrak - Energijska učinkovitost - Ocenjevanje (ISO 11011:2013)

General Information

Status
Published
Public Enquiry End Date
29-Jan-2015
Publication Date
12-May-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
15-Apr-2015
Due Date
20-Jun-2015
Completion Date
13-May-2015

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SLOVENSKI STANDARD
SIST EN ISO 11011:2015
01-junij-2015
6WLVQMHQL]UDN(QHUJLMVNDXþLQNRYLWRVW2FHQMHYDQMH ,62
Compressed air - Energy efficiency - Assessment (ISO 11011:2013)
Druckluft - Energieeffizienz - Bewertung (ISO 11011:2013)
Air comprimé - Efficacité énergétique - Évaluation (ISO 11011:2013)
Ta slovenski standard je istoveten z: EN ISO 11011:2015
ICS:
23.140 .RPSUHVRUMLLQSQHYPDWLþQL Compressors and pneumatic
VWURML machines
SIST EN ISO 11011:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 11011:2015
---------------------- Page: 2 ----------------------
SIST EN ISO 11011:2015
EUROPEAN STANDARD
EN ISO 11011
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2015
ICS 23.140
English Version
Compressed air - Energy efficiency - Assessment (ISO
11011:2013)

Air comprimé - Efficacité énergétique - Évaluation (ISO Druckluft - Energieeffizienz - Bewertung (ISO 11011:2013)

11011:2013)
This European Standard was approved by CEN on 19 March 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11011:2015 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 11011:2015
EN ISO 11011:2015 (E)
Contents Page

Foreword ..............................................................................................................................................................3

---------------------- Page: 4 ----------------------
SIST EN ISO 11011:2015
EN ISO 11011:2015 (E)
Foreword

The text of ISO 11011:2013 has been prepared by Technical Committee ISO/TC 118 “Compressors and

pneumatic tools, machines and equipment” of the International Organization for Standardization (ISO) and has

been taken over as EN ISO 11011:2015 by Technical Committee CEN/TC 232 “Compressors, vacuum pumps

and their systems” the secretariat of which is held by SIS.

This European Standard shall be given the status of a national standard, either by publication of an identical

text or by endorsement, at the latest by September 2015, and conflicting national standards shall be

withdrawn at the latest by September 2015.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech

Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 11011:2013 has been approved by CEN as EN ISO 11011:2015 without any modification.

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SIST EN ISO 11011:2015
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SIST EN ISO 11011:2015
INTERNATIONAL ISO
STANDARD 11011
First edition
2013-09-15
Compressed air — Energy
efficiency — Assessment
Air comprimé — Efficacité énergétique — Évaluation
Reference number
ISO 11011:2013(E)
ISO 2013
---------------------- Page: 7 ----------------------
SIST EN ISO 11011:2015
ISO 11011:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 11011:2015
ISO 11011:2013(E)
Contents  Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1  Scope ................................................................................................................................................................................................................................. 1

2  Normative references ...................................................................................................................................................................................... 1

3  Terms and definitions ..................................................................................................................................................................................... 1

3.1 General ........................................................................................................................................................................................................... 2

3.2 Flow .................................................................................................................................................................................................................. 3

3.3 Pressure ........................................................................................................................................................................................................ 4

3.4 Storage ........................................................................................................................................................................................................... 5

3.5 Volume ............................................................................................................................................................................................................ 5

4  Roles and responsibilities .......................................................................................................................................................................... 6

4.1 Identification of assessment team members ................................................................................................................ 6

4.2 Site management support ............................................................................................................................................................. 7

4.3 Communications .................................................................................................................................................................................... 7

4.4 Access to equipment, resources, and information ................................................................................................... 7

4.5 Assessment objectives and scope ........................................................................................................................................... 7

4.6 Identification of other assessment team members ................................................................................................. 7

4.7 Objective check ....................................................................................................................................................................................... 7

5  Assessment methodology............................................................................................................................................................................ 8

5.1 General ........................................................................................................................................................................................................... 8

5.2 Systems engineering methods ................................................................................................................................................... 8

5.3 Systems engineering process ..................................................................................................................................................... 8

5.4 System assessment process ......................................................................................................................................................... 9

6  Parameters and their determination ...........................................................................................................................................10

6.1 General ........................................................................................................................................................................................................10

6.2 Measurement .........................................................................................................................................................................................10

6.3 Pressure .....................................................................................................................................................................................................10

6.4 Flow rate ....................................................................................................................................................................................................11

6.5 Power ...........................................................................................................................................................................................................12

7  Initial data collection and evaluation ..........................................................................................................................................13

7.1 General ........................................................................................................................................................................................................13

7.2 Plant background ...............................................................................................................................................................................13

7.3 Plant function ........................................................................................................................................................................................13

7.4 Compressed air system definition .......................................................................................................................................13

7.5 Inventory of key end-use air demands ............................................................................................................................13

7.6 Heat recovery ........................................................................................................................................................................................13

7.7 Baseline period and duration of data logging ...........................................................................................................14

7.8 Energy use ................................................................................................................................................................................................14

7.9 Compressed air system supply efficiency .....................................................................................................................14

7.10 System volume .....................................................................................................................................................................................14

7.11 Pressure .....................................................................................................................................................................................................15

7.12 Flowrate .....................................................................................................................................................................................................15

7.13 Critical air demands ........................................................................................................................................................................15

7.14 Compressed air waste ....................................................................................................................................................................15

7.15 Air treatment .........................................................................................................................................................................................15

7.16 Compressor control .........................................................................................................................................................................16

7.17 Storage ........................................................................................................................................................................................................16

7.18 Maintenance ...........................................................................................................................................................................................16

7.19 Ambient intake conditions .........................................................................................................................................................16

8  Analysis of data from assessment ....................................................................................................................................................16

8.1 General ........................................................................................................................................................................................................16

© ISO 2013 – All rights reserved iii
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SIST EN ISO 11011:2015
ISO 11011:2013(E)

8.2 Baseline profiles .................................................................................................................................................................................17

8.3 System volume .....................................................................................................................................................................................19

8.4 Pressure profile ...................................................................................................................................................................................19

8.5 Perceived high-pressure demand ........................................................................................................................................21

8.6 Demand profile ....................................................................................................................................................................................22

8.7 Critical air demands ........................................................................................................................................................................23

8.8 Compressed air waste ....................................................................................................................................................................24

8.9 Optimized air treatment ..............................................................................................................................................................25

8.10 Reduced system operating pressure .................................................................................................................................26

8.11 Balance of supply and demand ..............................................................................................................................................27

8.12 Maintenance opportunities .......................................................................................................................................................27

8.13 Heat recovery opportunities ....................................................................................................................................................28

9  Reporting and documentation of assessment findings .............................................................................................28

9.1 Assessment report ............................................................................................................................................................................28

9.2 Confidentiality ......................................................................................................................................................................................29

9.3 Energy-saving opportunities ...................................................................................................................................................29

9.4 Data for third-party review .......................................................................................................................................................29

Annex A (informative) Introduction to energy assessment .......................................................................................................30

Annex B (informative) Assessment activities — General .............................................................................................................32

Annex C (informative) Assessment activities — Supply ................................................................................................................37

Annex D (informative) Assessment activities — Transmission .............................................................................................43

Annex E (informative) Assessment activities — Demand ............................................................................................................47

Annex F (informative) Competencies ................................................................................................................................................................50

Bibliography .............................................................................................................................................................................................................................51

iv © ISO 2013 – All rights reserved
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SIST EN ISO 11011:2015
ISO 11011:2013(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www.iso.org/patents

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

The committee responsible for this document is ISO/TC 118, Compressors and pneumatic tools, machines

and equipment, Subcommittee SC 6, Air compressors and compressed air systems.
© ISO 2013 – All rights reserved v
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SIST EN ISO 11011:2015
ISO 11011:2013(E)
Introduction

This International Standard has been developed with reference to available documentation (see

Bibliography) relating to energy assessment of compressed air systems.

This International Standard is produced to support the objectives of energy management for those

organisations utilizing compressed air and wishing to improve the energy efficiency of such systems.

Remembering the words of Lord Kelvin who said in 1883, “If you cannot measure it, you cannot

improve it”, this International Standard aims to assist with measurement and provide the knowledge

to enable improvement.

The prime consideration for any compressed air system is the ability to generate air with the least

amount of energy. Having done this, the next consideration is to transmit energy from the point of

generation to the point of use with the least loss. The final consideration is to eliminate waste and use

the least amount of air for the production process.

This International Standard uses speciality terms which relate the needs of assessment activities to

those of compressed air systems. Many terms will appear new to the users of this International Standard

who are familiar with general compressed air terms.
A general introduction to energy assessment is given in Annex A.

1) Extracts from ASME EA-4-2010 were used with permission from ASME. The core elements used are from Scope

and Introduction, Organizing the Assessment, Analysis of Data From the Assessment, Reporting and Documentation,

and Mandatory Appendices — I, Preliminary Data Collection Matrix.
vi © ISO 2013 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 11011:2015
INTERNATIONAL STANDARD ISO 11011:2013(E)
Compressed air — Energy efficiency — Assessment

WARNING — Users of this International Standard are advised that energy-related judgements

should not compromise safety issues.
1  Scope

This International Standard sets requirements for conducting and reporting the results of a compressed

air system assessment (hereafter referenced as an “assessment”) that considers the entire system, from

energy inputs to the work performed as the result of these inputs.

This International Standard considers compressed air systems as three functional subsystems:

— supply which includes the conversion of primary energy resource to compressed air energy;

— transmission which includes movement of compressed air energy from where it is generated to

where it is used;

— demand which includes the total of all compressed air consumers, including productive end-use

applications and various forms of compressed air waste.
This International Standard sets requirements for
— analysing the data from the assessment,
— reporting and documentation of assessment findings, and

— identification of an estimate of energy saving resulting from the assessment process.

This International Standard identifies the roles and responsibilities of those involved in the

assessment activity.

This International Standard provides indicative information in Annexes B, C, D, and E of the type of

data to be collected to assist in a successful assessment. The information provided is not exhaustive

and therefore is not intended to restrict the inclusion of other data. The form and presentation of the

information given in the annexes is also not intended to restrict the manner of presentation of the

reporting to the client.
2  Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 1217, Displacement compressors — Acceptance tests
ISO 5598, Fluid power systems and components — Vocabulary
3  Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1217 and ISO 5598 and the

following apply.
© ISO 2013 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 11011:2015
ISO 11011:2013(E)
3.1  General
3.1.1
air treatment

any process provided for the purpose of separation and purification of the compressed air

3.1.2
artificial demand

excess air consumed by a system’s unregulated or poorly regulated uses due to operating at a pressure

in excess of actual requirements
3.1.3
assessment team

authority to fulfil roles and responsibility of the assessment having appropriate functions and knowledge

3.1.4
baseline

set of typical operating period, work conditions, and performance parameters revealed by assessment

and used for comparison of efficiency of measures recommended as a result of energy efficiency

assessment procedures
3.1.5
compressed air point of use
components using the pneumatic energy for physical or chemical actions
3.1.6
compressed air systems

group of subsystems comprising integrated sets of components, including air compressors, treatment

equipment, controls, piping, pneumatic tools, pneumatically powered machinery, and process

applications utilizing compressed air
3.1.7
compressed air system assessment

activity which considers all components and functions, from energy inputs (SUPPLY SIDE) to the work

performed (DEMAND SIDE) as the result of these inputs; undertaken to observe, measure, and document

energy reduction and performance improvement opportunities in a compressed air system

3.1.8
data logging

measurement of physical parameters while tabulating a periodic log (record) of their numerical value

using time-aligned data frames for the plurality of recorded parameters
Note 1 to entry: Two types of data logging are:

a) dynamics: data logging while creating a sufficiently high frequency periodic log (record) so as to investigate

the time-based variation of measured physical parameters

b) trending: data logging during an extended duration of time for the purpose of investigating regularities,

irregularities, or both in the measured physical parameters throughout time
3.1.9
demand

total of all compressed air consumers, including productive end-use applications and various forms of

compressed air waste
3.1.10
drawdown

circumstance observed in a compressed air system that is characterized by continual pressure decay

arising from a compressed air system event whereby air demand exceeds the capacity of supply

2 © ISO 2013 – All rights reserved
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SIST EN ISO 11011:2015
ISO 11011:2013(E)
3.1.11
operating period

group of typical time periods that share similar compressed air energy and compressed air demand profiles

Note 1 to entry: See 3.1.15.
3.1.12
spot check measurement

measurement of physical parameters creating a log (record) of their numerical value that is carried out

at random time intervals or limited to a few instances
3.1.13
supply
conversion of primary energy resource to compressed air energy
3.1.14
transmission
movement of compressed air energy from where it is generated to where it is used
3.1.15
typical operating period
time period that represents a period of typical plant operation
3.2  Flow
3.2.1
demand flow rate
total airflow rate of demand-side consumption

Note 1 to entry: Demand-side consumption includes productive consumers, inappropriate usage, artificial

demand, and demand-side waste. This takes into account supply flow plus or minus the compressed air supplied

to system demand from secondary storage as
...

SLOVENSKI STANDARD
kSIST FprEN ISO 11011:2015
01-januar-2015
6WLVQMHQL]UDN(QHUJLMVNDXþLQNRYLWRVW2FHQMHYDQMH ,62
Compressed air - Energy efficiency - Assessment (ISO 11011:2013)
Air comprimé - Efficacité énergétique - Évaluation (ISO 11011:2013)
Ta slovenski standard je istoveten z: FprEN ISO 11011
ICS:
23.140 .RPSUHVRUMLLQSQHYPDWLþQL Compressors and pneumatic
VWURML machines
kSIST FprEN ISO 11011:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
kSIST FprEN ISO 11011:2015
---------------------- Page: 2 ----------------------
kSIST FprEN ISO 11011:2015
EUROPEAN STANDARD
FINAL DRAFT
FprEN ISO 11011
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2014
ICS
English Version
Compressed air - Energy efficiency - Assessment (ISO
11011:2013)
Air comprimé - Efficacité énergétique - Évaluation (ISO
11011:2013)

This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical

Committee CEN/TC 232.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which

stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language

made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprEN ISO 11011:2014 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
kSIST FprEN ISO 11011:2015
FprEN ISO 11011:2014 (E)
Contents Page

Foreword ..............................................................................................................................................................3

---------------------- Page: 4 ----------------------
kSIST FprEN ISO 11011:2015
FprEN ISO 11011:2014 (E)
Foreword

The text of ISO 11011:2013 has been prepared by Technical Committee ISO/TC 118 “Compressors and

pneumatic tools, machines and equipment” of the International Organization for Standardization (ISO) and has

been taken over as FprEN ISO 11011:2014 by Technical Committee CEN/TC 232 “Compressors, vacuum

pumps and their systems” the secretariat of which is held by SIS.
This document is currently submitted to the Unique Acceptance Procedure.
Endorsement notice

The text of ISO 11011:2013 has been approved by CEN as FprEN ISO 11011:2014 without any modification.

---------------------- Page: 5 ----------------------
kSIST FprEN ISO 11011:2015
---------------------- Page: 6 ----------------------
kSIST FprEN ISO 11011:2015
INTERNATIONAL ISO
STANDARD 11011
First edition
2013-09-15
Compressed air — Energy
efficiency — Assessment
Air comprimé — Efficacité énergétique — Évaluation
Reference number
ISO 11011:2013(E)
ISO 2013
---------------------- Page: 7 ----------------------
kSIST FprEN ISO 11011:2015
ISO 11011:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 8 ----------------------
kSIST FprEN ISO 11011:2015
ISO 11011:2013(E)
Contents  Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1  Scope ................................................................................................................................................................................................................................. 1

2  Normative references ...................................................................................................................................................................................... 1

3  Terms and definitions ..................................................................................................................................................................................... 1

3.1 General ........................................................................................................................................................................................................... 2

3.2 Flow .................................................................................................................................................................................................................. 3

3.3 Pressure ........................................................................................................................................................................................................ 4

3.4 Storage ........................................................................................................................................................................................................... 5

3.5 Volume ............................................................................................................................................................................................................ 5

4  Roles and responsibilities .......................................................................................................................................................................... 6

4.1 Identification of assessment team members ................................................................................................................ 6

4.2 Site management support ............................................................................................................................................................. 7

4.3 Communications .................................................................................................................................................................................... 7

4.4 Access to equipment, resources, and information ................................................................................................... 7

4.5 Assessment objectives and scope ........................................................................................................................................... 7

4.6 Identification of other assessment team members ................................................................................................. 7

4.7 Objective check ....................................................................................................................................................................................... 7

5  Assessment methodology............................................................................................................................................................................ 8

5.1 General ........................................................................................................................................................................................................... 8

5.2 Systems engineering methods ................................................................................................................................................... 8

5.3 Systems engineering process ..................................................................................................................................................... 8

5.4 System assessment process ......................................................................................................................................................... 9

6  Parameters and their determination ...........................................................................................................................................10

6.1 General ........................................................................................................................................................................................................10

6.2 Measurement .........................................................................................................................................................................................10

6.3 Pressure .....................................................................................................................................................................................................10

6.4 Flow rate ....................................................................................................................................................................................................11

6.5 Power ...........................................................................................................................................................................................................12

7  Initial data collection and evaluation ..........................................................................................................................................13

7.1 General ........................................................................................................................................................................................................13

7.2 Plant background ...............................................................................................................................................................................13

7.3 Plant function ........................................................................................................................................................................................13

7.4 Compressed air system definition .......................................................................................................................................13

7.5 Inventory of key end-use air demands ............................................................................................................................13

7.6 Heat recovery ........................................................................................................................................................................................13

7.7 Baseline period and duration of data logging ...........................................................................................................14

7.8 Energy use ................................................................................................................................................................................................14

7.9 Compressed air system supply efficiency .....................................................................................................................14

7.10 System volume .....................................................................................................................................................................................14

7.11 Pressure .....................................................................................................................................................................................................15

7.12 Flowrate .....................................................................................................................................................................................................15

7.13 Critical air demands ........................................................................................................................................................................15

7.14 Compressed air waste ....................................................................................................................................................................15

7.15 Air treatment .........................................................................................................................................................................................15

7.16 Compressor control .........................................................................................................................................................................16

7.17 Storage ........................................................................................................................................................................................................16

7.18 Maintenance ...........................................................................................................................................................................................16

7.19 Ambient intake conditions .........................................................................................................................................................16

8  Analysis of data from assessment ....................................................................................................................................................16

8.1 General ........................................................................................................................................................................................................16

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8.2 Baseline profiles .................................................................................................................................................................................17

8.3 System volume .....................................................................................................................................................................................19

8.4 Pressure profile ...................................................................................................................................................................................19

8.5 Perceived high-pressure demand ........................................................................................................................................21

8.6 Demand profile ....................................................................................................................................................................................22

8.7 Critical air demands ........................................................................................................................................................................23

8.8 Compressed air waste ....................................................................................................................................................................24

8.9 Optimized air treatment ..............................................................................................................................................................25

8.10 Reduced system operating pressure .................................................................................................................................26

8.11 Balance of supply and demand ..............................................................................................................................................27

8.12 Maintenance opportunities .......................................................................................................................................................27

8.13 Heat recovery opportunities ....................................................................................................................................................28

9  Reporting and documentation of assessment findings .............................................................................................28

9.1 Assessment report ............................................................................................................................................................................28

9.2 Confidentiality ......................................................................................................................................................................................29

9.3 Energy-saving opportunities ...................................................................................................................................................29

9.4 Data for third-party review .......................................................................................................................................................29

Annex A (informative) Introduction to energy assessment .......................................................................................................30

Annex B (informative) Assessment activities — General .............................................................................................................32

Annex C (informative) Assessment activities — Supply ................................................................................................................37

Annex D (informative) Assessment activities — Transmission .............................................................................................43

Annex E (informative) Assessment activities — Demand ............................................................................................................47

Annex F (informative) Competencies ................................................................................................................................................................50

Bibliography .............................................................................................................................................................................................................................51

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Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www.iso.org/patents

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

The committee responsible for this document is ISO/TC 118, Compressors and pneumatic tools, machines

and equipment, Subcommittee SC 6, Air compressors and compressed air systems.
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Introduction

This International Standard has been developed with reference to available documentation (see

Bibliography) relating to energy assessment of compressed air systems.

This International Standard is produced to support the objectives of energy management for those

organisations utilizing compressed air and wishing to improve the energy efficiency of such systems.

Remembering the words of Lord Kelvin who said in 1883, “If you cannot measure it, you cannot

improve it”, this International Standard aims to assist with measurement and provide the knowledge

to enable improvement.

The prime consideration for any compressed air system is the ability to generate air with the least

amount of energy. Having done this, the next consideration is to transmit energy from the point of

generation to the point of use with the least loss. The final consideration is to eliminate waste and use

the least amount of air for the production process.

This International Standard uses speciality terms which relate the needs of assessment activities to

those of compressed air systems. Many terms will appear new to the users of this International Standard

who are familiar with general compressed air terms.
A general introduction to energy assessment is given in Annex A.

1) Extracts from ASME EA-4-2010 were used with permission from ASME. The core elements used are from Scope

and Introduction, Organizing the Assessment, Analysis of Data From the Assessment, Reporting and Documentation,

and Mandatory Appendices — I, Preliminary Data Collection Matrix.
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INTERNATIONAL STANDARD ISO 11011:2013(E)
Compressed air — Energy efficiency — Assessment

WARNING — Users of this International Standard are advised that energy-related judgements

should not compromise safety issues.
1  Scope

This International Standard sets requirements for conducting and reporting the results of a compressed

air system assessment (hereafter referenced as an “assessment”) that considers the entire system, from

energy inputs to the work performed as the result of these inputs.

This International Standard considers compressed air systems as three functional subsystems:

— supply which includes the conversion of primary energy resource to compressed air energy;

— transmission which includes movement of compressed air energy from where it is generated to

where it is used;

— demand which includes the total of all compressed air consumers, including productive end-use

applications and various forms of compressed air waste.
This International Standard sets requirements for
— analysing the data from the assessment,
— reporting and documentation of assessment findings, and

— identification of an estimate of energy saving resulting from the assessment process.

This International Standard identifies the roles and responsibilities of those involved in the

assessment activity.

This International Standard provides indicative information in Annexes B, C, D, and E of the type of

data to be collected to assist in a successful assessment. The information provided is not exhaustive

and therefore is not intended to restrict the inclusion of other data. The form and presentation of the

information given in the annexes is also not intended to restrict the manner of presentation of the

reporting to the client.
2  Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 1217, Displacement compressors — Acceptance tests
ISO 5598, Fluid power systems and components — Vocabulary
3  Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1217 and ISO 5598 and the

following apply.
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3.1  General
3.1.1
air treatment

any process provided for the purpose of separation and purification of the compressed air

3.1.2
artificial demand

excess air consumed by a system’s unregulated or poorly regulated uses due to operating at a pressure

in excess of actual requirements
3.1.3
assessment team

authority to fulfil roles and responsibility of the assessment having appropriate functions and knowledge

3.1.4
baseline

set of typical operating period, work conditions, and performance parameters revealed by assessment

and used for comparison of efficiency of measures recommended as a result of energy efficiency

assessment procedures
3.1.5
compressed air point of use
components using the pneumatic energy for physical or chemical actions
3.1.6
compressed air systems

group of subsystems comprising integrated sets of components, including air compressors, treatment

equipment, controls, piping, pneumatic tools, pneumatically powered machinery, and process

applications utilizing compressed air
3.1.7
compressed air system assessment

activity which considers all components and functions, from energy inputs (SUPPLY SIDE) to the work

performed (DEMAND SIDE) as the result of these inputs; undertaken to observe, measure, and document

energy reduction and performance improvement opportunities in a compressed air system

3.1.8
data logging

measurement of physical parameters while tabulating a periodic log (record) of their numerical value

using time-aligned data frames for the plurality of recorded parameters
Note 1 to entry: Two types of data logging are:

a) dynamics: data logging while creating a sufficiently high frequency periodic log (record) so as to investigate

the time-based variation of measured physical parameters

b) trending: data logging during an extended duration of time for the purpose of investigating regularities,

irregularities, or both in the measured physical parameters throughout time
3.1.9
demand

total of all compressed air consumers, including productive end-use applications and various forms of

compressed air waste
3.1.10
drawdown

circumstance observed in a compressed air system that is characterized by continual pressure decay

arising from a compressed air system event whereby air demand exceeds the capacity of supply

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3.1.11
operating period

group of typical time periods that share similar compressed air energy and compressed air demand profiles

Note 1 to entry: See 3.1.15.
3.1.12
spot check measurement

measurement of physical parameters creating a log (record) of their numerical value that is carried out

at random time intervals or limited to a few instances
3.1.13
supply
conversion of primary energy resource to compressed air energy
3.1.14
transmission
movement of compressed air energy from where it is generated to where it is used
3.1.15
typical operating period
time period that represents a period of typical plant operation
3.2  Flow
3.2.1
demand flow rate
total airflow rate of demand-side consumption

Note 1 to entry: Demand-side consumption includes productive consumers, inappropriate usage, artificial

demand, and demand-side waste. This takes into account supply flow plus or minus the compressed air supplied

to system demand from secondary storage as system pressure decreases. This can also account for the airflow

entering secondary storage as system pressure increases.
3.2.2
flow dynamic application
end use wherein the peak airflow rate and minimum pressure occur simultaneously
3.2.3
flow static application

end uses characterized when peak airflow rate and minimum pressure required do not occur

simultaneously
3.2.4
generation flow rate

airflow rate of compressed air generated by the air compressor(s) before any air treatment equipment

air use and supply-side waste
3.2.5
peak airflow
maximum value of the airflow during the daily or
...

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