Spare parts provisioning

IEC 62550:2017 describes requirements for spare parts provisioning as a part of supportability activities that affect dependability performance so that continuity of operation of products, equipment and systems for their intended application can be sustained. This document is intended for use by a wide range of suppliers, maintenance support organizations and users and can be applied to all items.

Approvisionnement en pièces de rechange

IEC 62550:2017 spécifie les exigences relatives à l’approvisionnement en pièces de rechange relevant des activités de supportabilité ayant une incidence sur les caractéristiques de sûreté de fonctionnement et permettant ainsi d’assurer la continuité du fonctionnement des produits, des matériels et des systèmes pour leur application prévue. Le présent document est destiné à être utilisé par un large éventail de fournisseurs, d’organisations de support logistique à la maintenance et d’utilisateurs et peut être appliqué à toutes les entités.
Mots clés : pièces de rechange nécessaires

General Information

Status
Published
Publication Date
19-Jan-2017
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
20-Jan-2017
Ref Project

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IEC 62550
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Spare parts provisioning
Approvisionnement en pièces de rechange
IEC 62550:2017-01(en-fr)
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IEC 62550
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Spare parts provisioning
Approvisionnement en pièces de rechange
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 03.120.01; 21.020 ISBN 978-2-8322-3834-9

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62550:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms, definitions and abbreviated terms ........................................................................ 8

3.1 Terms and definitions .............................................................................................. 8

3.2 Abbreviated terms ................................................................................................. 11

4 Overview ....................................................................................................................... 12

4.1 Participants and major steps in the spare parts provisioning process .................... 12

4.2 Types of spare parts ............................................................................................. 14

4.3 Identification of spare parts as integral part of the level of repair analysis

(LORA) ................................................................................................................. 14

4.4 Overall spare parts provisioning process ............................................................... 16

5 Demand forecast ........................................................................................................... 17

5.1 General ................................................................................................................. 17

5.2 Forecast based on consumption data .................................................................... 18

5.2.1 General ......................................................................................................... 18

5.2.2 Procedures for forecast ................................................................................. 18

5.3 Initial determination of demand ............................................................................. 19

5.3.1 General ......................................................................................................... 19

5.3.2 Prediction of failure rates and failure intensities ............................................. 19

5.3.3 Calculation of demand rates .......................................................................... 20

6 Spare parts quantification .............................................................................................. 20

6.1 General ................................................................................................................. 20

6.1.1 Process overview .......................................................................................... 20

6.1.2 Probability distributions for spare parts quantification .................................... 22

6.1.3 Measures of effectiveness (MoE) ................................................................... 23

6.1.4 ABC-analysis (Pareto analysis) ...................................................................... 24

6.1.5 Quantification of repairable items .................................................................. 26

6.1.6 Quantification of non-repairable items ........................................................... 26

6.2 Strategic (critical, insurance) spare parts .............................................................. 28

6.3 Inventory systems ................................................................................................. 28

6.4 Inventory optimization ........................................................................................... 30

7 Spare parts documentation ............................................................................................ 32

7.1 Principles and objectives ...................................................................................... 32

7.2 Illustrated parts catalogue (IPC) ............................................................................ 32

7.3 Parts catalogue ..................................................................................................... 35

8 Supply management ...................................................................................................... 35

8.1 General ................................................................................................................. 35

8.1.1 Activities ........................................................................................................ 35

8.1.2 Economic provisioning ................................................................................... 36

8.2 Sources for spare parts ......................................................................................... 36

8.3 Supply policies ...................................................................................................... 37

8.3.1 Insourcing ...................................................................................................... 37

8.3.2 Outsourcing ................................................................................................... 37

8.3.3 Single sourcing .............................................................................................. 37

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IEC 62550:2017 © IEC 2017 – 3 –

8.3.4 Global sourcing ............................................................................................. 38

8.3.5 Concurrent sourcing ...................................................................................... 38

8.3.6 Obsolescence management ........................................................................... 39

8.4 Planning and control of the flow of repairable spare parts ..................................... 39

Annex A (informative) Prognosis of demand ......................................................................... 40

A.1 General ................................................................................................................. 40

A.2 Synthetic determining of demand .......................................................................... 40

A.3 Prognosis based on consumption data .................................................................. 41

A.3.1 Overview ....................................................................................................... 41

A.3.2 Forecast on the basis of the moving average ................................................. 41

A.3.3 Forecast on the basis of the weighted moving average .................................. 42

A.3.4 Forecast on the basis of exponential smoothing ............................................. 42

A.3.5 Forecast on the basis of regression analysis ................................................. 43

Annex B (informative) Measures of effectiveness ................................................................. 44

B.1 General ................................................................................................................. 44

B.2 Stock-related measures of effectiveness ............................................................... 44

B.2.1 Fill rate (FR) and risk of shortage (ROS) ........................................................ 44

B.2.2 Expected backorders (EBO)........................................................................... 46

B.2.3 Mean waiting time (MWT) .............................................................................. 47

B.3 System-related measures of effectiveness ............................................................ 48

B.3.1 Operational system availability (A ) ............................................................. 48

B.3.2 Number of systems not operationally ready (NOR)......................................... 49

Annex C (informative) Example: Quantification of spare parts and optimization of

inventory stocks .................................................................................................................... 50

C.1 General ................................................................................................................. 50

C.2 Product breakdown structure ................................................................................ 50

C.3 Calculation of spare parts quantities and costs ..................................................... 52

Bibliography .......................................................................................................................... 54

Figure 1 – Participants and major steps in the spare parts provisioning process ................... 13

Figure 2 – Identification of spare parts .................................................................................. 16

Figure 3 – Spare parts provisioning process during design and development ........................ 17

Figure 4 – Spare parts provisioning process during utilization ............................................... 21

Figure 5 – Principle of an ABC-analysis ................................................................................ 25

Figure 6 – Inventory control policies ..................................................................................... 27

Figure 7 – Hierarchically structured inventory system ........................................................... 28

Figure 8 – Single-product-single-inventory models ................................................................ 30

Figure 9 – Idealized inventory model for non-repairable items ............................................... 31

Figure 10 – Supply management activities ............................................................................ 36

Figure A.1 – Procedures of demand forecast ........................................................................ 40

Figure B.1 – Diagram for the determination of the fill rate (FR) with a Poisson demand ........ 45

Figure B.2 – Diagram for the determination of the factor K for the required fill rate ............... 46

Figure B.3 – Inventory system with a backorder case ............................................................ 46

Figure B.4 – Diagram for the determination of the mean waiting time (MWT) with a

Poisson demand ................................................................................................................... 48

Figure C.1 – Structure of the DCN ........................................................................................ 50

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– 4 – IEC 62550:2017 © IEC 2017

Figure C.2 – Inventory system for the DCN ........................................................................... 53

Table 1 – Responsibilities, targets, and measurements for suppliers, maintainers,

operator and users ................................................................................................................ 13

Table C.1 – First indenture level – Data communication network ........................................... 51

Table C.2 – Second indenture level – Communication system ............................................... 51

Table C.3 – Third indenture level – Power supply system ..................................................... 51

Table C.4 – Third indenture level – Main processor .............................................................. 51

Table C.5 – Third indenture level – Fan system .................................................................... 52

Table C.6 – Investments in spare repairable items ................................................................ 52

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IEC 62550:2017 © IEC 2017 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPARE PARTS PROVISIONING
FOREWORD

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International Standard IEC 62550 has been prepared by IEC technical committee 56:

Dependability.
The text of this standard is based on the following documents:
FDIS Report on voting
56/1711/FDIS 56/1719/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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– 6 – IEC 62550:2017 © IEC 2017

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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IEC 62550:2017 © IEC 2017 – 7 –
INTRODUCTION
Spare parts provisioning is the process for planning necessary spare parts under
consideration of a customer's needs and requirements.

Proper planning and control of spare parts is a critical component of effective supportability. If

the right parts are not available when needed for routine maintenance or repairs, downtime is

prolonged. If too many spare parts are available, the enterprise absorbs excessive costs and

the overhead of carrying inventory.

Spare part planning and supply to achieve business objectives are based on four goals:

• the right spare part;
• in the right quantity;
• at the right time;
• at the right place.

Spare parts provisioning is a prerequisite for all types of maintenance tasks, such as

replacements and repairs. Spare parts for corrective maintenance tasks should be supplied at

random intervals for steady state availability. It may take three to four repairs before steady

state availability is reached. In this period repairs may be clustered, and the need can vary

significantly over time. For preventive and on-condition maintenance, fixed intervals or

approximately fixed intervals for replacement items may occur. Coordination of demand for

spare parts with supply of spare parts at the required time is an important factor. Unavailable

materials are one of the most cited reasons for delays in the completion of maintenance

tasks.

The availability of spare parts is one of the factors that impacts system downtime.

Methodologies such as integrated logistic support (ILS) and its subsidiary logistic support

analysis (LSA) provide necessary information for spare parts provisioning. This information

includes system breakdown, maintenance concept, and supply concept. Spare part
optimization will cover issues typically giving answers to questions such as:

• which spare parts should be stored within the maintenance organization or by a supplier?

• how many spare parts of each type should be stocked?

Spare part optimization is based on operations research methods and selected reliability

methods and may be analytical or use Monte Carlo simulations. The optimization process

aims at balancing the cost of holding spare parts against the probability and cost of spare part

shortage.

Before spare parts can be ordered, procedures for procurement, administration and storage of

required material should be specified. Additionally, a general supply concept should be

compiled and specified.

Correct material supply procedures will guarantee that spare parts are ordered in time and

delivered when requested. The procedures also include control of the repair of replacement

parts as well as the monitoring of repair turn-around times. All organizations involved, from

production to purchasing and storage, via maintenance, should have complete transparency

about material availability and possible completion of the task. The planned material costs in

the task should be compared with its consumption. These are then documented and form the

basis of usage-controlled materials planning. With this process, inventory of spare parts can

be optimized to meet availability requirements with minimum inventory levels.

This document is applicable to all industries where supportability has a major impact on the

dependability of the item through its life cycle.
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– 8 – IEC 62550:2017 © IEC 2017
SPARE PARTS PROVISIONING
1 Scope

This document describes requirements for spare parts provisioning as a part of supportability

activities that affect dependability performance so that continuity of operation of products,

equipment and systems for their intended application can be sustained.

This document is intended for use by a wide range of suppliers, maintenance support

organizations and users and can be applied to all items.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

NOTE Some terms listed in IEC 60050-192 are also included here for the convenience of the reader.

3.1 Terms and definitions
3.1.1
consumables

any item which is expendable, may be regularly replaced and generally is not product specific

EXAMPLE Oil, grease, nuts, bolts and screws, gaskets, etc.
Note 1 to entry: Generally consumable items are relatively low cost.
3.1.2
corrective maintenance
maintenance carried out after fault detection to effect restoration

Note 1 to entry: Corrective maintenance of software invariably involves some modification.

[SOURCE: IEC 60050-192:2015, 192-06-06]
3.1.3
failure
loss of ability to perform as required

Note 1 to entry: A failure of an item is an event that results in a fault state of that item: see fault

[IEC 60050-192:2015, 192-04-01].

Note 2 to entry: Qualifiers, such as catastrophic, critical, major, minor, marginal and insignificant, may be used to

categorize failures according to the severity of consequences, the choice and definitions of severity criteria

depending upon the field of application.
---------------------- Page: 10 ----------------------
IEC 62550:2017 © IEC 2017 – 9 –

Note 3 to entry: Qualifiers, such as misuse, mishandling and weakness, may be used to categorize failures

according to the cause of failure.
[SOURCE: IEC 60050-192:2015, 192-03-01]
3.1.4
indenture level
level of sub-division within a system hierarchy
EXAMPLE System, subsystem, assembly, and component.

Note 1 to entry: From the maintenance perspective, the indenture level depends upon various factors, including

the complexity of the item's construction, the accessibility of sub items, skill level of maintenance personnel, test

equipment facilities, and safety considerations.
[SOURCE: IEC 60050-192:2015, 192-01-05]
3.1.5
integrated logistic support
ILS

management process to determine and co-ordinate the provision of all materials

and resources required to meet the needs for operation and maintenance
[SOURCE: IEC 60050-192:2015, 192-01-30]
3.1.6
item
subject being considered

Note 1 to entry: The item may be an individual part, component, device, functional unit, equipment, subsystem, or

system.

Note 2 to entry: The item may consist of hardware, software, people or any combination thereof.

[SOURCE: IEC 60050-192:2015, 192-01-01, modified — omission of internal references and

Notes 3, 4 and 5]
3.1.7
level of maintenance
maintenance level
set of maintenance actions to be carried out at a specified indenture level
[SOURCE: IEC 60050-192:2015, 192-06-04]
3.1.8
line replaceable item
LRI

replaceable hardware or software unit which can be replaced directly on the equipment by the

user or by a maintenance support facility

Note 1 to entry: In some projects instead of LRI the term line replaceable unit (LRU) is applied.

...

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