SIST EN ISO 19901-5:2004

SLOVENSKI STANDARD
SIST EN ISO 19901-5:2004
01-maj-2004
Petroleum and natural gas industries - Specific requirements for offshore
structures - Part 5: Weight control during engineering and construction (ISO 19901
-5:2003)
Petroleum and natural gas industries - Specific requirements for offshore structures -
Part 5: Weight control during engineering and construction (ISO 19901-5:2003)
Erdöl- und Erdgasindustrie - Offshore-Plattformen - Teil 5: Gewichtskontrolle während
der Auslegung und Konstruktion (ISO 19901-5:2003)
Industries du pétrole et du gaz naturel - Exigences spécifiques relatives aux structures
en mer - Partie 5: Contrôles des poids durant la conception et la fabrication (ISO 19901-
5:2003)
Ta slovenski standard je istoveten z: EN ISO 19901-5:2003
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
SIST EN ISO 19901-5:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 19901-5:2004

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SIST EN ISO 19901-5:2004
EUROPEAN STANDARD
EN ISO 19901-5
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2003
ICS 75.180.10
English version
Petroleum and natural gas industries - Specific requirements for
offshore structures - Part 5: Weight control during engineering
and construction (ISO 19901-5:2003)
Industries du pétrole et du gaz naturel - Exigences Erdöl- und Erdgasindustrie Besondere Anforderungen an
spécifiques relatives aux structures en mer - Partie 5: Offshore- Bauwerke - Teil 5: Gewichtskontrolle während der
Contrôles des poids durant la conception et la fabrication Auslegung und Konstruktion (ISO 19901-5:2003)
(ISO 19901-5:2003)
This European Standard was approved by CEN on 10 July 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19901-5:2003 E
worldwide for CEN national Members.

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SIST EN ISO 19901-5:2004
EN ISO 19901-5:2003 (E)
Foreword
This document (EN ISO 19901-5:2003) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 "Materials, equipment and offshore
structures for petroleum and natural gas industries", the secretariat of which is held by AFNOR.
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 January 2004, and conflicting national
standards shall be withdrawn at the latest by January 2004.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and
the United Kingdom.
NOTE FROM CMC  The foreword is susceptible to be amended on reception of the German
language version. The confirmed or amended foreword, and when appropriate, the normative
annex ZA for the references to international publications with their relevant European
publications will be circulated with the German version.
Endorsement notice
The text of ISO 19901-5:2003 has been approved by CEN as EN ISO 19901-5:2003 without any
modifications.
2

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SIST EN ISO 19901-5:2004


INTERNATIONAL ISO
STANDARD 19901-5
First edition
2003-07-15


Petroleum and natural gas industries —
Specific requirements for offshore
structures —
Part 5:
Weight control during engineering and
construction
Industries du pétrole et du gaz naturel — Exigences spécifiques
relatives aux structures en mer —
Partie 5: Contrôles des poids durant la conception et la fabrication




Reference number
ISO 19901-5:2003(E)
©
ISO 2003

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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
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©  ISO 2003
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Published in Switzerland

ii © ISO 2003 — All rights reserved

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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
Contents Page
Foreword. v
Introduction . vii
1 Scope. 1
2 Normative references. 2
3 Terms, definitions and abbreviated terms. 2
3.1 Terms and definitions. 2
3.2 Abbreviated terms. 7
4 Weight control classes. 7
4.1 General. 7
4.2 Class A: High definition of weight and CoG requirements. 7
4.3 Class B: Medium definition of weight and CoG requirements. 8
4.4 Class C: Low definition of weight and CoG requirements . 8
4.5 Selection of weight control class . 8
5 Weight and load budget (WLB). 9
5.1 General. 9
5.2 Requirements. 10
5.3 Weight and load budget (WLB) content. 10
5.3.1 General. 10
5.3.2 50/50 weight estimate . 11
5.3.3 Weight reserves. 12
5.3.4 Future weights and loads. 12
5.3.5 Loading conditions and parameters . 13
5.3.6 Weight and load budget (WLB) formats and levels. 14
5.3.7 CoG constraints. 15
6 Weight reporting. 15
6.1 General. 15
6.2 The weight control procedure . 16
6.3 Requirements to the weight report . 17
6.3.1 Introduction to the report. 17
6.3.2 Summary and conclusions to the report. 17
6.3.3 Area/module reports. 19
6.3.4 Special reports (optional). 20
6.3.5 Annexes to the report. 21
7 Requirements for weight data from suppliers and weighing of bulk and equipment. 22
7.1 General. 22
7.2 Provision of weight information . 22
7.3 Requirements for weighing. 23
7.4 Weighing equipment. 23
7.5 Weighing procedure. 23
7.6 Notification and witnessing of weighing . 24
7.7 Calibration of weighing equipment . 24
7.8 Weighing operation. 24
7.9 Temporaries during weighing. 25
7.10 Items excluded during weighing . 25
8 Requirements for weighing of major assemblies. 25
8.1 Weighing procedure. 25
8.2 Environmental conditions. 25
8.2.1 Light. 25
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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
8.2.2 Wind.26
8.2.3 Temperature and humidity .26
8.3 Weighing.27
8.3.1 Number and timing of weighings.27
8.3.2 Weighing procedure.27
8.3.3 Notification and witnessing of weighings .28
8.3.4 Preparation of the weighing.28
8.3.5 Weighing equipment.29
8.3.6 Calibration of weighing system .31
8.3.7 Foundation and supports .32
8.3.8 Structural integrity.32
8.3.9 Weighing operation.32
8.3.10 CoG calculations.33
8.3.11 Weighing certificate.34
8.3.12 Weighing report.34
9 Requirements for “as-built” weight documentation.35
Annex A (informative) Weight data sheets — Tagged equipment .36
Annex B (informative) Weighing certificates .38
Annex C (informative) Weight and load budget (WLB) formats and levels .42
Annex D (informative) Major elements of the weight displacement .43
Annex E (informative) Supplier weighing procedure .44
Annex F (informative) Guidelines for displacement measurement of floaters.46
Bibliography.50



iv © ISO 2003 — All rights reserved

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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 19901-5 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.
ISO 19901 consists of the following parts, under the general title Petroleum and natural gas industries —
Specific requirements for offshore structures:
 Part 4: Geotechnical and foundation design considerations
 Part 5: Weight control during engineering and construction
The following parts of ISO 19901 are under preparation:
 Part 1: Metocean design and operating considerations
 Part 2: Seismic design procedures and criteria
 Part 3: Topsides structure
 Part 6: Marine operations
 Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
ISO 19901 is part of a series of standards for offshore structures. The full series consists of the following
standards:
 ISO 19900, Petroleum and natural gas industries — General requirements for offshore structures
 ISO 19901 (all parts), Petroleum and natural gas industries — Specific requirements for offshore
structures
 ISO 19902, Petroleum and natural gas industries — Fixed steel offshore structures
 ISO 19903, Petroleum and natural gas industries — Fixed concrete offshore structures
 ISO 19904, Petroleum and natural gas industries — Floating offshore structures
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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
 ISO 19905-1, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 1: Jack-ups
 ISO/TR 19905-2, Petroleum and natural gas industries — Site-specific assessment of mobile offshore
units — Part 2: Jack-ups commentary
 ISO 19906, Petroleum and natural gas industries — Arctic offshore structures
vi © ISO 2003 — All rights reserved

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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
Introduction
The offshore structures International Standards ISO 19900 to ISO 19906 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.
The offshore structures International Standards 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.
© ISO 2003 — All rights reserved vii

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SIST EN ISO 19901-5:2004

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SIST EN ISO 19901-5:2004
INTERNATIONAL STANDARD ISO 19901-5:2003(E)

Petroleum and natural gas industries — Specific requirements
for offshore structures —
Part 5:
Weight control during engineering and construction
1 Scope
This part of ISO 19901 specifies requirements for controlling the weight and centre of gravity (CoG) by means
of mass management during the engineering and construction of structures for the offshore environment. The
provisions are applicable to offshore projects that include structures of all types and materials.
This part of ISO 19901 differentiates between projects where considerations with regard to weight and CoG
have a high priority as a result of weight and/or CoG sensitivity, and projects where weight and CoG are of
little consequence. This differentiation has been made by the introduction of three different classes of
structure (Class A, Class B and Class C). Depending on the degree of control necessary, different clauses of
this part of ISO 19901 will apply; Clause 4 provides guidelines for assigning one of these classes.
This part of ISO 19901
 specifies quality requirements for reporting of weights and centres of gravity,
 specifies requirements for weight reporting,
 provides a basis for overall project status reports or management reports for all classes,
 specifies requirements for weight and load budgets for offshore installations,
 specifies the methods and requirements for the weighing of major assemblies, and the determination of
weight and centre of gravity,
 specifies requirements for weight information from suppliers, including weighing of equipment and bulk
materials for offshore installations;
and may be used
 as a basis for planning and presentation of the contractor's weight-reporting system;
 as a basis for evaluation of the contractor's weight-reporting system;
 as a means of refining the structural analysis/model;
 as a contract reference between the ordering client and the contractor;
 as a basis for costing.
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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
2 Normative references
The following referenced documents are indispensable for the application 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.
Guide to the expression of uncertainty in measurement (GUM), BIPM, IEC, IFCC, ISO, IUPAC, IUPAP and
OIML
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
assembly
designed and fabricated group of bulk and equipment items which form one unit
3.1.2
ballast
variable solid or fluid content used to trim a floating structure and/or keep a certain draft
3.1.3
base weight estimate
weight estimate used for budgeting purposes which does not include any unforeseen quantity growth,
estimating errors or unnamed events
3.1.4
base weight contingency
weight addition, based on risk analysis or experience, used to transform a base weight estimate into a 50/50
weight estimate accounting for uncertainties
3.1.5
budget weight
weight reference figures as defined in the weight and load budget and related to the initial or changed design
concept
3.1.6
bulk
component or arrangement of components defined as stock materials or of low complexity
NOTE Bulk items support the equipment items by providing infrastructure around and between them.
3.1.7
client weight reserve
weight addition with CoG (usually a fixed weight) controlled by the client and used to cater for any orders for
variation to the contractual design concept
3.1.8
CoG envelope
defined constraint volume within which the CoG of an assembly must remain for design purposes
3.1.9
consumables
variable content, which is solid in stores and fluid in utility tanks
EXAMPLES Fuel, provisions, service/potable water, operating utilities.
2 © ISO 2003 — All rights reserved

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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
3.1.10
contractor weight reserve
weight addition (usually a fixed weight) controlled by the contractor and used to cater for any design growth
due to development of the initial design concept
3.1.11
deadweight
total carrying capacity of a floating structure
NOTE Includes weight of crude oil, deck cargo, temporaries, water, snow and ice accumulations, marine growth,
ballast water, consumables, crew and their effects.
3.1.12
displacement
weight of the volume of water displaced by a floating structure, which is the sum of lightweight and deadweight
3.1.13
dry weight
weight of a component, weight item or an assembly in its dry installed condition including permanent utilities
NOTE 1 Examples of permanent utilities are gearbox oil, hydraulic oil, filter sand, etc.
NOTE 2 Any content of operating fluid flowing through a component, weight item or an assembly is excluded.
3.1.14
equipment
component, or arrangement of components, built for specific function(s)
NOTE The component/assembly normally has unique documentation due to its function and complexity.
3.1.15
first fill
initial filling of liquid in equipment items, piping lines or tanks
NOTE First fill typically takes place towards the end of site construction, prior to tow-out and prior to filling for normal
operations.
3.1.16
float-out
loading condition in which a major assembly is transferred from a dry construction site to become self-floating
3.1.17
fluid content
all fluids flowing through a component, weight item or an assembly
EXAMPLES Process gases, liquids, powders, etc.
3.1.18
future weight
weight of a component or an assembly to be installed after the start of production
NOTE Start of production is also known as “first oil”.
3.1.19
grillage
temporary structural foundation assemblies for modules or sections during transportation
3.1.20
gross reported weight
sum of the net weight and weight allowance
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SIST EN ISO 19901-5:2004
ISO 19901-5:2003(E)
3.1.21
gross WTO
gross weight take-off
sum of the net WTO and weight allowance
3.1.22
gross weight/WTO contingency
difference between the gross reported weight and the gross WTO at any time during the project execution
3.1.23
hook-up
installation and commissioning of components or assemblies after the modules have been installed in their
final position
3.1.24
hook weight
sum of lift weight and lifting gear weight
3.1.25
lifting gear
rigging
equipment needed during a lifting operation
EXAMPLES Slings, spreader bars, lifting frames, shackles, etc.
3.1.26
lift weight
weight of a component, an assembly or a module at padeyes, including temporaries and residual fluid content
but excluding lifting gear
3.1.27
lightweight
lightship
dry weight and utility systems required for a minimum operation of a floating structure
3.1.28
live load
load on a deck area according to its defined function
3.1.29
loading condition
defined event or operation during which loads occur
NOTE For each loading condition, all weight items and variable loads that are known or predicted to occur are
identified, quantified and located.
3.1.30
load-out
loading condition in which a major assembly or a module is transferred from land onto a floating structure by
horizontal movement
3.1.31
mating
loading condition in whic
...