SIST EN ISO 19901-5:2022

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

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.

Contents Page
European foreword . 3

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.
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 19901-5:2021(E)
© 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
ii
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 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
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 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 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, 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
CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 19901-5:2016), which has been
technically revised.
The main changes are as follows:
— part title changed to "Weight Management";
— document restructured and columnization removed;
— weight control classes removed;
— requirements for weight management for all project phases implemented;
— annexes deleted or relocated to body of document:
— 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
Annex C “Control weights”;
— deleted previous Annex D “Major elements of the weight displacement”;
— information in previous Annex E “Supplier weighing procedure” relocated to Clause 8;
— deleted previous Annex F “Guidelines for displacement measurement of floating facilities”;
vi
ISO 19901-5:2021(E)
— information in previous Annex G “Requirements for weight control during operations” relocated
to Clause 7;
— information in previous Annex H “Requirements for topsides weight estimation — New builds/
green field” relocated to Clause 7;
— information in previous Annex I “Executive summary description” relocated to Clause 7;
— replaced previous Annex J “Weighing result uncertainty” with Annex F “Weighing result
uncertainty”;
— previous Annex K “Weight control database structure” replaced with new Annex G “Weight
database structure”.
— Annexes added:
— Annex A “Commentary”;
— Annex D “Variable weight”;
— Annex E “Example decision-making RAPID matrix”;
— Annex H “Weight of concrete structures”;
— Annex I “Coordinate systems”;
— Annex J “Weight allowances and reserves”;
— Annex K “Weight management competencies”.
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.
vii
ISO 19901-5:2021(E)
Introduction
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
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.
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
Standards.
viii
INTERNATIONAL STANDARD ISO 19901-5:2021(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 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
me a s ur ement (GUM: 1995)
ISO 19901-5:2021(E)
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
3  Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
approved variation
approved scope change affecting the predicted weights (3.32) and changing the control weights (3.11)
3.2
assembly
designed and fabricated group of discipline bulks (3.12) and tagged equipment (3.34) that form one unit
EXAMPLE Deck, module, living quarters, bridge, flare, substructure.
3.3
brownfield
modifications made to an existing facility (3.16)
3.4
budget weight
weight and centre of gravity (3.5) reference values as part of the control weights (3.11)
3.5
centre of gravity
CoG
point in a body or system of bodies at which the entire weight is considered to act
Note 1 to entry: For assemblies, the aggregate CoG is the mathematical weighted mean of the CoGs of the
individual items (comprising the completed assembly) measured from a common reference point.
3.6
centre of gravity envelope
CoG envelope
defined volume within which the centre of gravity (3.5) of an assembly (3.2) is constrained for a specified
loading condition (3.23)
3.7
conceptual design
phase of design during which several concepts are evaluated, and preferred concepts are selected
3.8
conceptual design weight
sum of the predicted weight (3.32) and the conceptual design weight reserve (3.9)
Note 1 to entry: This weight is used for engineering purposes and for checking fabrication/installation strategies
during conceptual design.
3.9
conceptual design weight reserve
provision during conceptual design to allow for reserves when control weights are determined
EXAMPLE Management reserve, planned future reserve and unplanned future reserve.
ISO 19901-5:2021(E)
3.10
consumable
material used and replenished during normal operation of a facility (3.16)
EXAMPLE Potable/service water, diesel fuel, crew provisions, drilling powders for creation of mud and/or
cement.
3.11
control weights
budget weight (3.4) [and associated centre of gravity envelope (3.6)], not-to-exceed weight (3.28) [and
associated centre of gravity envelope (3.6)] and reserves [e.g. management reserve (3.24), planned future
reserve (3.31), unplanned future reserve (3.38)] for each loading condition (3.23)
3.12
discipline bulks
all dry weight items (3.43) excluding tagged equipment (3.34)
EXAMPLE Piping, manual valves, structural, cable and trays, etc.
3.13
dry weight
weight of a component, weight item (3.43) or an assembly (3.2) in its dry installed condition including
permanent contents in closed systems in tagged equipment (3.34)
Note 1 to entry: Examples of permanent contents are gearbox oil, hydraulic oil, filter sand, coolant, etc.
Note 2 to entry: Excludes variable weights.
Note 3 to entry: Dry weight results in permanent actions, defined as G1 and G2 in ISO 19902 and ISO 19901-3.
3.14
estimate to complete
ETC
estimated weight (3.15) of discipline bulks (3.12) and/or tagged equipment (3.34) with insufficient
definition measured by weight take-off
3.15
estimated weight
weight derived by using norm-based calculations or previous experience
3.16
facility
topsides (3.36) and substructure that is built and installed to serve a particular purpose
3.17
front end engineering design
FEED
phase following conceptual design (3.7) phase, during which the selected concept is matured, and design
parameters normally are fixed
3.18
greenfield
new facilities that are fabricated onshore and installed offshore
3.19
gross weight take-off
gross WTO
net weight take-off (3.27) plus net weight allowance (3.26)
ISO 19901-5:2021(E)
3.20
hook-up and commissioning
HUC
installation of components or assemblies (3.2) after the topsides (3.36) have been installed to complete
a functioning facility (3.16)
3.21
lift weight
weight of a component or assembly (3.2) at its lift points, including permanent items and temporary
items (3.35), but excluding the lift rigging
3.22
lightship weight
displacement of the complete floating facility (3.16) (i.e. ready for service) with all its machinery,
equipment and outfitting, including permanent ballast, required spare parts, constant process fluids
and liquids in tagged equipment (3.34) and piping at their working levels but without liquids in storage
or reserve supply tanks, items of consumable or variable loads, stores or crews and their effects
3.23
loading condition
condition for which the weight and centre of gravity (3.5) of an assembly (3.2) is required to be managed
Note 1 to entry: See 5.5.
3.24
management reserve
reserve to take account for scope changes after setting the control weights (3.11)
3.25
master equipment list
MEL
project specific list for compiling and managing technical data for tagged equipment (3.34)
3.26
net weight allowance
addition applied to net weight take-off (3.27) to account for weight growth due to item weight
uncertainty, design development and construction
Note 1 to entry: Guidance on net weight allowances is given in Annex J.
3.27
net weight take-off
net WTO
weight take-off based on the actual designed data from 3D model, engineering drawings or supplier
data
3.28
not-to-exceed weight
NTE weight
maximum acceptable weight and centre of gravity envelope (3.6) for the respective loading condition
(3.23)
3.29
operating reserve
weight difference between the predicted weight (3.32) and the not-to-exceed weight (3.28) during the
operations phase
3.30
operating weight
dry installed weight plus variable weight (3.40)
ISO 19901-5:2021(E)
3.31
planned future reserve
reserve to account for planned modifications (e.g. additions, removals or relocations) during the
operations phase of the facility (3.16)
3.32
predicted weight
expected (median) weight, the sum of gross weight take-off (3.19) and estimate to complete (3.14)
through all project phases
Note 1 to entry: The median (P50) weight estimate has a 50-50 chance of being lesser or greater than the out-
turn weight.
Note 2 to entry: During the conceptual design phase, the net and gross WTO’s can be zero.
3.33
reconciled weighed weight
actual weight at the time of the weighing, including any weighing correction(s)
3.34
tagged equipment
equipment identified and tracked in the master equipment list (3.25)
3.35
temporary items
items temporarily installed during a loading condition (3.23) and removed afterwards
Note 1 to entry: Temporary items do not form part of a structure’s permanent dry or operating weight.
3.36
topsides
assemblies placed on a substructure (fixed or floating) to provide some or all of a facility's (3.16)
functions
Note 1 to entry: For floating facilities and jack-ups, the hull deck is not typically part of the topsides, however,
some of the equipment and discipline bulks mounted in or on the hull can be defined as part of the topsides.
Note 2 to entry: A separate fabricated deck or module support frame is part of the topsides.
3.37
uncertainty allowance
allowance, based on risk analysis or experience, to account for the immaturity of the conceptual design
scope
3.38
unplanned future reserve
reserve to account for the addition of unplanned modifications during the operations phase of the
facility (3.16)
EXAMPLE Equipment upgrades, process and non-process system modifications (including new flowlines),
additional supporting structures, etc.
3.39
upper bound wei
...