SIST EN ISO 19901-5:2022

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

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
operations. These can be new facilities (greenfield) or modifications to existing facilities (brownfield).
Weight management is necessary throughout operations, decommissioning and removal to facilitate
structural integrity management (SIM). The provisions of this document are applicable to fixed and
floating facilities of all types.
Weight management only includes items with static mass.
Snow and ice loads are excluded as they are not considered to be part of the facility. Dynamic loads are
addressed in ISO 19904-1, ISO 19901-6 and ISO 19901-7.
This document specifies:
a) requirements for managing and controlling weights and CoGs of assemblies and entire facilities;
b) requirements for managing weight and CoG interfaces;
c) standardized terminology for weight and CoG estimating and reporting;
d) requirements for determining not-to-exceed (NTE) weights and budget weights;
e) requirements for weighing and determination of weight and centre of gravity (CoG) of tagged
equipment, assemblies, modules and facilities;
This document can be used:
f) as a basis for costing, scheduling or determining suitable construction method(s) or location(s) and
installation strategy;
g) as a basis for planning, evaluating and preparing a weight management plan and reporting system;
h) as a contract reference;
i) as a means of refining the structural analysis or model.

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)

Le présent document spécifie les exigences relatives à la gestion et au contrôle du poids et du centre de gravité (CdG) des installations en mer par la gestion des masses pendant toutes les phases du cycle de vie, notamment l'étude conceptuelle, l’étude avancée de détail (FEED), l'ingénierie de détail, la construction et les opérations. Ces structures peuvent être des installations nouvelles ou des modifications d’installations existantes (zones de réhabilitation).
La gestion des poids est nécessaire tout au long des opérations, mais également au cours des phases de démantèlement et d'enlèvement, afin de faciliter la gestion de l'intégrité structurelle (GIS). Les dispositions du présent document s'appliquent aux installations fixes et flottantes de tous types.
La gestion des poids ne concerne que les éléments ayant une masse statique.
Les charges associées à la neige et à la glace sont exclues, car elles ne sont pas considérées comme faisant partie de l’installation. Les charges dynamiques sont traitées dans l'ISO 19904-1, ISO 19901-6 et l'ISO 19901-7.
Le présent document spécifie:
a) les exigences applicables à la gestion et au contrôle des poids et des CdG des ensembles et des installations entières;
b) les exigences applicables aux interfaces de la gestion des poids et du CdG;
c) une terminologie normalisée pour l'estimation et l'établissement de rapports relatifs aux poids et aux CdG;
d) les exigences applicables à la détermination des poids à ne pas dépasser (NTE) et des poids prévisionnels;
e) les exigences applicables à la pesée et à la détermination du poids et du centre de gravité (CdG) des équipements identifiés, des ensembles, des modules et des installations.
Le présent document peut être utilisé:
f) comme base d'établissement des coûts, de planning ou de détermination de méthode de construction ou de localisation(s) appropriés et de stratégie d'installation;
g) comme base de planification, d'évaluation et de préparation d'un plan de gestion des poids et d'un système de suivi;
h) comme référence de contrat;
i) comme moyen d'amélioration de l'analyse structurelle ou du modèle de calcul.

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

Ta dokument določa zahteve za upravljanje oziroma nadzor teže in težišča (CoG) obratov na morju z upravljanjem mase v vseh fazah življenjskega cikla, vključno s konceptualnim načrtovanjem, predprojektnim inženirskim načrtovanjem (FEED), načrtovanjem za izvedbo, izdelavo in obratovanjem. To so lahko novi obrati (greenfield) ali spremenjeni obstoječi obrati (brownfield). Upravljanje teže je potrebno med obratovanjem, izločitvijo iz uporabe in odstranitvijo, da se olajša upravljanje strukturne celovitosti (SIM). Določbe tega dokumenta se uporabljajo za vse vrste fiksnih in plavajočih obratov. Upravljanje teže vključuje samo elemente s statično maso. Snežna in ledna obtežba sta izključeni, saj se ne štejeta za del objekta. Dinamične obtežbe so obravnavane v standardih ISO 19904-1, ISO 19901-6 in ISO 19901-7. Ta dokument določa: a) zahteve za upravljanje oziroma nadzor teže in težišča sestavov ter celotnih objektov; b) zahteve za vmesnike za upravljanje teže in težišča; c) standardizirano terminologijo za ocenjevanje teže in težišča ter poročanje; d) zahteve za določanje največje teže (NTE, not-to-exceed) in proračunske teže; e) zahteve za tehtanje oziroma določanje teže in težišča označene opreme, sestavov, modulov ter objektov. Ta dokument je mogoče uporabiti: f) kot osnovo za izračun stroškov, načrtovanje ali določanje ustreznih načinov in lokacij gradnje ter strategije instalacije; g) kot osnovo za načrtovanje, vrednotenje in pripravo načrta upravljanja teže ter sistema poročanja; i) kot sredstvo za izboljšanje strukturne analize ali modela.

General Information

• Status: Published
• Public Enquiry End Date: 14-Jun-2020
• Publication Date: 12-Dec-2021
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Dec-2021
• Due Date: 12-Feb-2022
• Completion Date: 13-Dec-2021
• Ref Project: EN ISO 19901-5:2021 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 5: Weight management (ISO 19901-5:2021)

Relations

• Replaces: SIST EN ISO 19901-5:2016 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 5: Weight control during engineering and construction (ISO 19901-5:2016)
• Effective Date: 08-Dec-2021
• Replaces: SIST EN ISO 19901-5:2016 - Petroleum and natural gas industries - Specific requirements for offshore structures - Part 5: Weight control during engineering and construction (ISO 19901-5:2016)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

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.

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SIST EN ISO 19901-5:2022

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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.

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SIST EN ISO 19901-5:2022
EN ISO 19901-5:2021 (E)
Contents Page
European foreword . 3

2

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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.

3

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SIST EN ISO 19901-5:2022

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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

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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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2021 – All rights reserved

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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

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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
iv
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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
v
© ISO 2021 – All rights reserved

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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.

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oSIST prEN ISO 19901-5:2020

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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

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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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

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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

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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
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oSIST prEN ISO 19901-5:2020
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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
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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
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— 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;
d
...