ISO/FDIS 19901-5

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19901-5
ISO/TC 67/SC 7
Petroleum and natural gas
Secretariat: BSI
industries — Specific requirements
Voting begins on:
2021-06-15 for offshore structures —
Voting terminates on:
Part 5:
2021-08-10
Weight management
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 5: Gestion des poids
ISO/CEN PARALLEL PROCESSING
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 19901-5:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 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

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 ........................................................................................................................................................13

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 .............................................................................................................................................................................20

7.3.1 General...................................................................................................................................................................................20

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 ...................................................................................................................22

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

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

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

7.4.3 Weight reporting ...........................................................................................................................................................23

7.4.4 Weighing of assemblies ...........................................................................................................................................23

7.5 Installation and HUC .......................................................................................................................................................................23

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

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

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

7.6.3 Weight database ............................................................................................................................................................24

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

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

7.6.6 Decommissioning .........................................................................................................................................................25

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

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

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

8.3 Weighing requirements ................................................................................................................................................................26

8.3.1 Equipment ..........................................................................................................................................................................26

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 ................................................................................................................................28

8.5.5 Spare weighing devices and ancillaries.....................................................................................................28

8.6 Witnessing of weighing ................................................................................................................................................................28

8.7 Scheduling of weighings ..............................................................................................................................................................28

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

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

8.10 Temporary items present during a weighing ............................................................................................................29

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

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

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

9.1 General ........................................................................................................................................................................................................30

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 ...........................................................................................................................................32

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 ................................................................................33

9.4 Preparations prior to the weighing ....................................................................................................................................33

9.4.1 Notification and witnessing of weighings ...............................................................................................33

9.4.2 Environmental conditions during a weighing .....................................................................................33

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

9.4.4 Temporary items during the weighing ......................................................................................................34

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

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

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

9.5.3 Consistency of results ...............................................................................................................................................35

9.5.4 CoG calculations ............................................................................................................................................................35

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

9.5.6 Weighing certificate....................................................................................................................................................36

Annex A (informative) Commentary ..................................................................................................................................................................37

Annex B (informative) Weighing certificates ............................................................................................................................................41

Annex C (informative) Example control weight summary ..........................................................................................................45

Annex D (informative) Variable weight ..........................................................................................................................................................46

Annex E (informative) Example decision-making RAPID matrix.........................................................................................50

Annex F (informative) Weighing result uncertainty ..........................................................................................................................52

Annex G (informative) Weight database structure .............................................................................................................................55

Annex H (informative) Weight management guidelines for concrete structures ...............................................56

Annex I (informative) Coordinate systems ..................................................................................................................................................59

Annex J (informative) Weight allowances and reserves ................................................................................................................61

Annex K (informative) Weight management competencies ......................................................................................................63

Bibliography .............................................................................................................................................................................................................................64

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

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

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

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/

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, in collaboration with the European Committee for Standardization (CEN) Technical

Committee CEN/TC 12, Materials, equipment and offshore structures for petroleum, petrochemical and

natural gas industries, in accordance with the Agreement on technical cooperation between ISO and

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

— previous Annex A “Weight data sheets – tagged equipment” combined with previous Annex B

“Weighing certificates” to create new joined into a new Annex B “Weighing certificates”;

— previous Annex C “Weight and load budget (WLB) formats and levels” replaced with new

— information in previous Annex E “Supplier weighing procedure” relocated to Clause 8;

— deleted previous Annex F “Guidelines for displacement measurement of floating facilities”;

— information in previous Annex G “Requirements for weight control during operations” relocated

— information in previous Annex H “Requirements for topsides weight estimation — New builds/

— information in previous Annex I “Executive summary description” relocated to Clause 7;

— replaced previous Annex J “Weighing result uncertainty” with Annex F “Weighing result

— previous Annex K “Weight control database structure” replaced with new Annex G “Weight

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

The International Standards on offshore structures prepared by TC 67/SC 7 (ISO 19900, the ISO 19901

series, ISO 19902, ISO 19903, ISO 19904-1, the ISO 19905 series, and ISO 19906) constitute a common

basis covering those aspects that address design requirements and assessments of all offshore facilities

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 facilities, whatever the

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

The International Standards on offshore structures prepared by TC 67/SC 7 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

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 design (FEED), detail engineering, construction and