IEC 62550:2017

IEC 62550 ®
Edition 1.0 2017-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Spare parts provisioning
Approvisionnement en pièces de rechange

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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

– 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

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
op
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
...