Petroleum and natural gas industries - Specific requirements for offshore structures - Part 5: Weight management (ISO 19901-5:2021)

Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore-Bauwerke - Teil 5: Gewichtskontrolle (ISO 19901-5:2021)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures en mer - Partie 5: Gestion des poids (ISO 19901-5:2021)

Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne ploščadi - 5. del: Upravljanje teže (ISO 19901-5:2021)

General Information

Status
Published
Public Enquiry End Date
14-Jun-2020
Publication Date
12-Dec-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Dec-2021
Due Date
12-Feb-2022
Completion Date
13-Dec-2021

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SLOVENSKI STANDARD
SIST EN ISO 19901-5:2022
01-februar-2022
Nadomešča:
SIST EN ISO 19901-5:2016
Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne
ploščadi - 5. del: Upravljanje teže (ISO 19901-5:2021)

Petroleum and natural gas industries - Specific requirements for offshore structures -

Part 5: Weight management (ISO 19901-5:2021)

Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore-Bauwerke - Teil 5:

Gewichtskontrolle (ISO 19901-5:2021)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures

en mer - Partie 5: Gestion des poids (ISO 19901-5:2021)
Ta slovenski standard je istoveten z: EN ISO 19901-5:2021
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
SIST EN ISO 19901-5:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 19901-5:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 19901-5:2022
EN ISO 19901-5
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2021
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19901-5:2016
English Version
Petroleum and natural gas industries - Specific
requirements for offshore structures - Part 5: Weight
management (ISO 19901-5:2021)

Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie - Besondere

spécifiques relatives aux structures en mer - Partie 5: Anforderungen an Offshore-Bauwerke - Teil 5:

Gestion des poids (ISO 19901-5:2021) Gewichtskontrolle (ISO 19901-5:2021)
This European Standard was approved by CEN on 11 September 2021.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-5:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 19901-5:2022
EN ISO 19901-5:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 19901-5:2022
EN ISO 19901-5:2021 (E)
European foreword

This document (EN ISO 19901-5:2021) has been prepared by Technical Committee ISO/TC 67

"Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries"

in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures

for petroleum, petrochemical and natural gas industries” the secretariat of which is held by NEN.

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 June 2022, and conflicting national standards shall be

withdrawn at the latest by June 2022.

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

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 19901-5:2016.

Any feedback and questions on this document should be directed to the users’ national standards

body/national committee. A complete listing of these bodies can be found on the CEN website.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 19901-5:2021 has been approved by CEN as EN ISO 19901-5:2021 without any

modification.
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SIST EN ISO 19901-5:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 19901-5:2022
INTERNATIONAL ISO
STANDARD 19901-5
Third edition
2021-11
Petroleum and natural gas
industries — Specific requirements
for offshore structures —
Part 5:
Weight management
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 5: Gestion des poids
Reference number
ISO 19901-5:2021(E)
© ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 19901-5:2022
ISO 19901-5:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 19901-5:2022
ISO 19901-5:2021(E)
Contents Page

Foreword ....................................................................................................................................................................................................................................... vi

Introduction ...........................................................................................................................................................................................................................viii

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

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

3  Terms and definitions .................................................................................................................................................................................... 2

4 Abbreviations .......................................................................................................................................................................................................... 6

5 Principles of weight management ..................................................................................................................................................... 7

5.1 General ........................................................................................................................................................................................................... 7

5.2 Weight management during project lifecycle phases .......................................................................................... 7

5.3 Weight management objectives ............................................................................................................................................... 7

5.3.1 Objectives during conceptual design phase ............................................................................................... 7

5.3.2 Objectives during FEED, detail engineering and construction phases .............................. 8

5.3.3 Objectives during operations and decommissioning phases ..................................................... 8

5.4 Illustration of weight versus time ......................................................................................................................................... 8

5.5 Loading conditions.............................................................................................................................................................................. 9

5.5.1 General ........................................................................................................................................................................................ 9

5.5.2 Typical loading conditions ......................................................................................................................................... 9

6 Control Weights ..................................................................................................................................................................................................10

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

6.2 Purpose ...................................................................................................................................................................................................... 11

6.3 Budget weights and NTE weights ....................................................................................................................................... 11

6.3.1 Budget Weights ................................................................................................................................................................. 11

6.3.2 Reserves .................................................................................................................................................................................. 11

6.3.3 NTE weights......................................................................................................................................................................... 12

6.4 Loading conditions and parameters ................................................................................................................................12

6.5 Control weights during operations phase ...................................................................................................................12

7 Weight management during project execution phases ...........................................................................................12

7.1 Conceptual design ......... .................................................................................................................................. ..................................12

7.1.1 General .....................................................................................................................................................................................12

7.1.2 Predicted weight ............................................................................................................................................................. 13

7.1.3 Conceptual design weight ....................................................................................................................................... 13

7.1.4 Upper bound weight constraint ......................................................................................................................... 13

7.1.5 Weight estimating .......................................................................................................................................................... 14

7.1.6 Key documentation ....................................................................................................................................................... 14

7.1.7 Estimating principles ..................................................................................................................................................15

7.1.8 Deliverables ......................................................................................................................................................................... 17

7.2 FEED ......... ............................................................. ........................................................................................................................................ 18

7.2.1 General ..................................................................................................................................................................................... 18

7.2.2 Weight management plan ........................................................................................................................................ 18

7.2.3 Weight management procedure......................................................................................................................... 19

7.2.4 Weight reporting ............................................................................................................................................................. 19

7.2.5 Weight checking and verification ..................................................................................................................... 20

7.3 Detail engineering ............................................................................................................................................................................ 21

7.3.1 General ..................................................................................................................................................................................... 21

7.3.2 Weight management plan ........................................................................................................................................ 21

7.3.3 Weight management procedure......................................................................................................................... 21

7.3.4 Weight reporting ............................................................................................................................................................. 21

7.3.5 Weight checking and verification ..................................................................................................................... 23

7.4 Construction .......................................................................................................................................................................................... 23

7.4.1 General .....................................................................................................................................................................................23

7.4.2 Weight database ............................................................................................................................................................... 23

7.4.3 Weight reporting ............................................................................................................................................................. 24

iii
© ISO 2021 – All rights reserved
---------------------- Page: 9 ----------------------
SIST EN ISO 19901-5:2022
ISO 19901-5:2021(E)

7.4.4 Weighing of assemblies ............................................................................................................................................. 24

7.5 Installation and HUC ...................................................................................................................................................................... 24

7.6 Operations ............................................................................................................................................................................................... 24

7.6.1 General ..................................................................................................................................................................................... 24

7.6.2 Weight management procedure......................................................................................................................... 24

7.6.3 Weight database ........................................................................................................................................... ....................25

7.6.4 Legacy weight databases ......................................................................................................................................... 25

7.6.5 Laydown and storage drawings ........................................................................................................................ 25

7.6.6 Decommissioning ...........................................................................................................................................................26

8  Requirements for suppliers’ weight data and weighing of tagged equipment and

assembled discipline bulks ...................................................................................................................................................................26

8.1 General ........................................................................................................................................................................................................ 26

8.2 Submission of weight data ......... ................................................................................................................................................ 26

8.3 Weighing requirements ............................................................................................................................................................... 27

8.3.1 Equipment ............................................................................................................................................................................. 27

8.3.2 Discipline bulks ................................................................................................................................................................ 27

8.4 Weighing procedure ....................................................................................................................................................................... 27

8.5 Weighing devices ...............................................................................................................................................................................28

8.5.1 Type of weighing device ............................................................................................................................................28

8.5.2 Calibration of weighing devices .........................................................................................................................28

8.5.3 Maximum relative uncertainty for weighing devices ....................................................................28

8.5.4 Capacity of weighing device ..................................................................................................................................29

8.5.5 Spare weighing devices and ancillaries ......................................................................................................29

8.6 Witnessing of weighing ................................................................................................................................................................29

8.7 Scheduling of weighings .............................................................................................................................................................. 29

8.8 Environmental conditions during a weighing .........................................................................................................29

8.9 Weighing operation ......................................................................................................................................................................... 29

8.10 Temporary items present during a weighing ...........................................................................................................30

8.11 Permanent items not installed during a weighing ..............................................................................................30

8.12 Weighing certificate ........................................................................................................................................... .............................30

9  Requirements for weighing of major assemblies ...........................................................................................................31

9.1 General ........................................................................................................................................................................................................ 31

9.2 Weighing procedure ....................................................................................................................................................................... 31

9.3 Weighing system ................................................................................................................................................................................ 32

9.3.1 Load cells ................................................................................................................................................................................ 32

9.3.2 Read-out devices ............................................................................................................................................................. 32

9.3.3 Uncertainty of weighing system ........................................................................................................................ 32

9.3.4 Calibration of load cells .............................................................................................................................................33

9.3.5 Capacity of weighing system components................................................................................................ 33

9.3.6 Spare load cells and ancillaries .......................................................................................................................... 33

9.3.7 Hydraulic jacking system ......................................................................................................................................... 33

9.3.8 Levelness of the assembly during the weighing ..................................................................................34

9.4 Preparations prior to the weighing ......... ..........................................................................................................................34

9.4.1 Notification and witnessing of weighings ................................................................................................34

9.4.2 Environmental conditions during a weighing.......................................................................................34

9.4.3 Weighing prediction report ...................................................................................................................................34

9.4.4 Temporary items during the weighing ........................................................................................................ 35

9.5 Weighing operation ......................................................................................................................................................................... 35

9.5.1 Number of results recorded .................................................................................................................................. 35

9.5.2 Readings of load cells and level criteria......................................................................................................36

9.5.3 Consistency of results .................................................................................................................................................36

9.5.4 CoG calculations ...............................................................................................................................................................36

9.5.5 Weighing report ...............................................................................................................................................................36

9.5.6 Weighing certificate ..................................................................................................................................................... 37

Annex A (informative) Commentary .................................................................................................................................................................38

Annex B (informative) Weighing certificates ..........................................................................................................................................42

© ISO 2021 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 19901-5:2022
ISO 19901-5:2021(E)

Annex C (informative) Example control weight summary ........................................................................................................46

Annex D (informative) Variable weight .........................................................................................................................................................47

Annex E (informative) Example decision-making RAPID matrix ......................................................................................51

Annex F (informative) Weighing result uncertainty .......................................................................................................................53

Annex G (informative) Weight database structure ...........................................................................................................................56

Annex H (informative) Weight management guidelines for concrete structures ............................................57

Annex I (informative) Coordinate systems ................................................................................................................................................60

Annex J (informative) Weight allowances and reserves ..............................................................................................................62

Annex K (informative) Weight management competencies.....................................................................................................64

Bibliography .............................................................................................................................................................................................................................65

© ISO 2021 – All rights reserved
---------------------- Page: 11 ----------------------
SIST EN ISO 19901-5:2022
ISO 19901-5:2021(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 (see 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 (see 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.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformit
...

SLOVENSKI STANDARD
oSIST prEN ISO 19901-5:2020
01-junij-2020
Industrija za predelavo nafte in zemeljskega plina - Posebne zahteve za naftne
ploščadi - 5. del: Upravljanje teže (ISO/DIS 19901-5:2020)

Petroleum and natural gas industries - Specific requirements for offshore structures -

Part 5: Weight management (ISO/DIS 19901-5:2020)

Erdöl- und Erdgasindustrie - Besondere Anforderungen an Offshore Bauwerke - Teil 5:

Gewichtskontrolle während der Auslegung und Konstruktion (ISO/DIS 19901-5:2020)

Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures

en mer - Partie 5: Contrôle des poids (ISO/DIS 19901-5:2020)
Ta slovenski standard je istoveten z: prEN ISO 19901-5
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
oSIST prEN ISO 19901-5:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 19901-5:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 19901-5:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 19901-5
ISO/TC 67/SC 7 Secretariat: BSI
Voting begins on: Voting terminates on:
2020-03-23 2020-06-15
Petroleum and natural gas industries — Specific
requirements for offshore structures —
Part 5:
Weight management

Industries du pétrole et du gaz naturel — Exigences spécifiques relatives aux structures en mer —

Partie 5: Contrôle des poids
ICS: 75.180.10
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 19901-5:2020(E)
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. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................vi

Introduction ............................................................................................................................................................................................................................viii

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Abbreviated terms .............................................................................................................................................................................................. 8

5 Principles of Weight Management ..................................................................................................................................................... 8

5.1 Weight management during project lifecycle phases ............................................................................................ 8

5.2 Objectives..................................................................................................................................................................................................... 9

5.3 Weight development graph .......................................................................................................................................................10

5.4 Loading conditions ...........................................................................................................................................................................12

6 Weight budget.......................................................................................................................................................................................................13

6.1 General ........................................................................................................................................................................................................13

6.2 Requirements ........................................................................................................................................................................................13

6.3 Content ........................................................................................................................................................................................................14

6.3.1 General...................................................................................................................................................................................14

6.3.2 Weight reserves .............................................................................................................................................................14

6.3.3 Future weights ................................................................................................................................................................14

6.3.4 Loading conditions and parameters ............................................................................................................14

6.3.5 Formats and levels.......................................................................................................................................................15

6.3.6 CoG envelopes .................................................................................................................................................................15

7 Weight management during project execution phases .............................................................................................15

7.1 Conceptual design .............................................................................................................................................................................15

7.1.1 General...................................................................................................................................................................................15

7.1.2 Estimating principles ................................................................................................................................................16

7.1.3 Deliverables .......................................................................................................................................................................17

7.2 FEED ..............................................................................................................................................................................................................17

7.2.1 General...................................................................................................................................................................................17

7.2.2 Weight management Procedure ......................................................................................................................17

7.2.3 Estimating principles ................................................................................................................................................18

7.2.4 Weight budget .................................................................................................................................................................18

7.2.5 Deliverables .......................................................................................................................................................................18

7.3 Detail engineering .............................................................................................................................................................................19

7.3.1 General...................................................................................................................................................................................19

7.3.2 Weight management procedure ......................................................................................................................19

7.3.3 Weight Budget .................................................................................................................................................................20

7.3.4 Deliverables .......................................................................................................................................................................20

7.4 Construction ...........................................................................................................................................................................................22

7.4.1 General...................................................................................................................................................................................22

7.4.2 Weight management procedure ......................................................................................................................22

7.4.3 Deliverables .......................................................................................................................................................................22

7.5 Installation ...............................................................................................................................................................................................22

7.5.1 General...................................................................................................................................................................................22

7.5.2 Weight management procedure ......................................................................................................................23

7.5.3 Deliverables .......................................................................................................................................................................23

7.6 Operating ..................................................................................................................................................................................................23

7.6.1 General...................................................................................................................................................................................23

7.6.2 Weight management Procedure ......................................................................................................................23

7.7 Decommissioning ..............................................................................................................................................................................24

8 Requirements for “as-built” weight documentation ....................................................................................................24

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(E)
9 Requirements for suppliers’ weight data and weighing of equipment and

assembled bulks ................................................................................................................................................................................................25

9.1 General ........................................................................................................................................................................................................25

9.2 Submission of weight data .........................................................................................................................................................25

9.3 Weighing requirements ................................................................................................................................................................26

9.3.1 Equipment ..........................................................................................................................................................................26

9.3.2 Bulk...........................................................................................................................................................................................26

9.4 Weighing procedure ........................................................................................................................................................................26

9.5 Weighing devices ................................................................................................................................................................................27

9.5.1 Type of weighing device .........................................................................................................................................27

9.5.2 Calibration of weighing devices .......................................................................................................................27

9.5.3 Maximum relative uncertainty for weighing devices ....................................................................27

9.5.4 Capacity of weighing device ................................................................................................................................28

9.5.5 Spare weighing devices and ancillaries.....................................................................................................28

9.6 Notification and witnessing of weighing .......................................................................................................................28

9.7 Scheduling of weighings ..............................................................................................................................................................28

9.8 Environmental conditions during a weighing ...........................................................................................................28

9.9 Weighing operation ..........................................................................................................................................................................28

9.10 Temporary objects present during a weighing ........................................................................................................29

9.11 Permanent items not installed during a weighing ................................................................................................29

9.12 Weighing Certificate ........................................................................................................................................................................29

10 Requirements for weighing of major assemblies ............................................................................................................30

10.1 General ........................................................................................................................................................................................................30

10.2 Weighing procedure ........................................................................................................................................................................30

10.3 Weighing system .................................................................................................................................................................................32

10.3.1 Load cells .............................................................................................................................................................................32

10.3.2 Read-out devices ...........................................................................................................................................................32

10.3.3 Uncertainty of weighing system ......................................................................................................................32

10.3.4 Calibration of load cells ...........................................................................................................................................32

10.3.5 Capacity of weighing system components ..............................................................................................33

10.3.6 Spare load cells and ancillaries ........................................................................................................................33

10.3.7 Hydraulic jacking system .......................................................................................................................................33

10.3.8 Levelness of the assembly during the weighing ................................................................................34

10.4 Preparations prior to the weighing ....................................................................................................................................34

10.4.1 Notification and witnessing of weighings ...............................................................................................34

10.4.2 Environmental conditions during a weighing .....................................................................................34

10.4.3 Weighing prediction report .................................................................................................................................34

10.4.4 Temporary items during the weighing ......................................................................................................35

10.5 Weighing operation ..........................................................................................................................................................................35

10.5.1 Number of results recorded ................................................................................................................................35

10.5.2 Readings of load cells and level criteria ....................................................................................................35

10.5.3 Consistency of results ...............................................................................................................................................36

10.5.4 CoG calculations ............................................................................................................................................................36

10.5.5 Weighing certificate....................................................................................................................................................36

10.5.6 Weighing report .............................................................................................................................................................36

Annex A (informative) Weighing certificates ............................................................................................................................................38

Annex B (normative) Accuracy of major assemblies weighing predictions .............................................................42

Annex C (informative) Example weight budget (WB) summary ...........................................................................................43

Annex D (informative) Guidelines for displacement measurement of floating facilities ...........................44

Annex E (informative) Weight management during operations ...........................................................................................48

Annex F (informative) Requirements for topside weight estimation — new builds/green field .......51

Annex G (informative) Executive summary description ...............................................................................................................54

Annex H (informative) Weighing result uncertainty .........................................................................................................................57

iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(E)

Annex I (informative) Weight management database structure ..........................................................................................60

Annex J (informative) Weight management of concrete structures ..................................................................................61

Annex K (informative) Coordinate systems ................................................................................................................................................64

Bibliography .............................................................................................................................................................................................................................66

© ISO 2020 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(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 (see 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 (see 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.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore

structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 7, Offshore

structures.

This third edition cancels and replaces the second edition (ISO 19901-5:2016), which has been

technically revised.
The main changes compared to the previous edition are as follows:
— Title changed to Weight Management
— Document restructured and columnisation removed.
— Weight control classes removed
— Requirements for weight management for all project phases implemented
— Annexes restructured:
— Previous Annexes A and B joined into a new Annex A.

— Previous Annex B deleted and replaced with new Annex B Accuracy of major assemblies

weighing predictions added

— Previous Annex D and F joined into new Annex D Guidelines for displacement measurement of

floating facilities

— Previous Annex E deleted and replaced by new revised Annex E Weight management during

operations

— Previous Annex F updated to Annex D Guidelines for displacement measurement of floating

facilities
— Previous Annex G updated to Annex E Weight management during operations
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oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(E)

— Previous Annex H updated to Annex F Requirements for topside weight estimation — New

builds/green field
— Previous Annex I updated to Annex G Executive summary description
— Previous Annex J expanded and updated to Annex H Weighing result uncertainty
— Previous Annex K updated to Annex I Weight management database structure
— New annexes added:
— Annex J Weight management of concrete structures
— Annex K Coordinate systems
A list of all parts in the ISO 19901 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
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oSIST prEN ISO 19901-5:2020
ISO/DIS 19901-5:2020(E)
Introduction

The International Standards ISO 19900, ISO 19901 (all parts), ISO 19902, ISO 19903, ISO 19904,

ISO 19905 (all parts) and ISO 19906 relating to offshore structures constitute a common basis covering

those aspects that address design requirements and assessments of all offshore structures used by the

petroleum and natural gas industries worldwide. Through their application the intention is to achieve

reliability levels appropriate for manned and unmanned offshore structures, whatever the type of

structure and the nature of the materials used.

It is important to recognize that structural integrity is an overall concept comprising models for

describing actions, structural analyses, design rules, safety elements, workmanship, quality control

procedures and national requirements, all of which are mutually dependent. The modification of one

aspect of design in isolation can disturb the balance of reliability inherent in the overall concept or

structural system. The implications involved in modifications, therefore, need to be considered in

relation to the overall reliability of all offshore structural systems.

ISO 19900, ISO 19901 (all parts), ISO 19902, ISO 19903, ISO 19904, ISO 19905 (all parts) and ISO 19906

relating to offshore structures are intended to provide a wide latitude in the choice of structural

configurations, materials and techniques without hindering innovation. Sound engineering judgement

is therefore necessary in the use of these International Standards.
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oSIST prEN ISO 19901-5:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 19901-5:2020(E)
Petroleum and natural gas industries — Specific
requirements for offshore structures —
Part 5:
Weight management
1 Scope

This document specifies requirements for managing and controlling the weight and centre of gravity

(CoG) of offshore facilities by means of mass management during all lifecycle phases; including

conceptual design, front end engineering, detail engineering, onshore/inshore construction, and offshore

installation. These facilities can be completely new installations (Greenfield) or the modifications to

existing installations (Brownfield). It is also necessary to continue managing and controlling weight

throughout operations, decommissioning and removal to facilitate Structural Integrity Management

(SIM) and to assist with removal of facilities during decommissioning. The provisions are applicable to

offshore facilities of all types (fixed and floating). Only items with mass shall be addressed. Loads not

related to mass shall be omitted. Se ISO 19904-1, ISO 19901-6 and ISO 19901-7.

Weights from mass of snow and ice are not to be included as they are not part of a facility.

This document specifies:

a) managing and controlling weights and CoGs for components and entire facilities;

b) managing weight and CoG interfaces;
c) standardised terminology for weight and CoG estimating and reporting;
...

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