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NEN-EN 12008-2
prEN 12008-2
Publikatie
Specifieke functionele
eisen voor de
materialen,
het ontwerp,
de aanleg, het
gebruik, het onderhoud
en de renovatie
van gasvoorzieningssystemen
met een
bedrijfsdruk
tot en met 16 bar.
Deel 2: Systemen van staal met een
bedrijfsdruk
t.m. 16 bar
uitsluitend
Specific functional requirements for the materials, design,
construction, operation, maintenance and renovation of gas
supply systems up to and including 16 bar.
Part 2: Steel-systems up to and including 16 bar MOP
Vo
augustus 1995
UDC 621.644.2:696.2:614.82/.83
Commentaar
15 december
normalisatie-instituten
vervangen
1995
van 18 Europese landen
Specific functional requirements for the materials, design, construction,
maintenance and renovation of gas supply systems up to and including
Part 2: Steel-systems up to and including 16 bar MOP
or
operation,
16 bar.
ev
be
in
Definitief vastgestelde
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voor
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KEN), waarin de nationale
samenwerken, heeft gepubliceerd het Europese normontwerp:
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4
DRAFY
prEN 12008-2
EUROPEANSTANDARD
NORMEEXJ'ROPEENNE
July
EUROPAISCHE NORM
1995
ICS
Descriptors
:
Vo
English
version
Specific
functional
requirements
for the
Materials,
Design, Construction,
Operation,
Maintenance and Renovation of Gas Supply Systems
up to and including
16 bar - Part 2: Steel-Systems
up to and including
16 bar MOP
or
Spezifische
funktionale
Anforderungen
an Werkstoffe,
Planung, Bau, Betrieb,
Instandhaltung
und Sanierung von
Gasversorgungssystemen
bis zu 16 bar
Betriebsdruck
- Teil 2: Stahl-Systeme
bis zu 16 bar Betriebsdruck
be
iew
ev
Pr
Prescriptions
fonctionnelles
spécifiques
pour les matériaux,
la
la construction,
conception,
l'entretien
et la
l'exploitation,
rénovation
des réseaux de distribution
de gaz jusque et y compris 16 bar Partie 2: Réseaux en acier de MOP
jusque et y compris 16 bar
This draft European Standard is submitted
to the CEN members for
It has been drawn up by Technical
Committee CEN/TC 234 .
CEN enquiry.
eld
CEN members are bound to comply with
If this draft becomes a European Standard,
the CEN/CENELEC Internal
Regulations
which stipulate
the conditions
for
giving
this European Standard the status of a national
standard without
any alteration.
This draft European Standard was established
by CEN in three official
versions
in any other language made by translation
French, German). A version
(English,
under the responsibility
of a CEN member into its own language and notified
to the Centra1 Secretariat
has the same status as the official
versions.
bodies of Austria,
CEN members are the national
standards
Belgium,
Denmark,
Greece,
Iceland,
Ireland,
France,
Germany,
Finland,
Italy,
Luxembourg,
Netherlands,
Norway, Portugal,
Spain, Sweden, Switzerland
and United Kingdom.
CEN
European Committee for Standardization
Comité Européen de Normalisation
Europäisches
Komitee für Normung
c CEN 1995
Centra1
Secretariat:
Copyright
reserved
rue de Stassart
36, BG050
Brussels
to al1 CEN members
Ref.
No. prEN 1200802:1995
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E
Page 2
prEN 12008-2:1995
. Contents
0
1
Introduction
scope..
........................................................
4
5
..........................................................
5
2
Normative Referencer,
3
Definitions, Symbols and abbreviations .....................................
6
4
4.1
4.1.1
4.12
4.13
4.1.4
4.1.5
Design
General &&i&&&f8~
SeleCtY& Oi ii8;3iGhSis’
Basematerial .......................................................
Qualit leve1 .......................................................
Welda r; ility
7
7
................................................
Vo
Impactenerg;':
......................................................
1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1
7
7
7
7
7
7
8
9
9
9
9
9
10
54
5:4.1
5.4.2
5.4.3
5.4.4
5.4.5
5.4.6
5.4.7
Constfuction .......................................................
Handling, transportation and storage ......................................
........................................................
Pipejoints
General
Welded jo&
’ ::::::::::::::::::::::::::::::::::::::::::::::::::::::
....................................................
Mechanicaljoints
Construction records
::::::::::::::::::::::::::::::::::::::::~~;;~~~~;
Laying ..........
General
Pip8 string’& 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 1: 11: 1: 1: 1: 1: 1: 11: : 1: 1: 1: 1: 1: 1: 1:
Deflection .........................................................
Connection to ether plant ..............................................
Valves
Underwate;~rÒ;si;ies’:::::::::::::::::::::::::::::::::::::::::::::::::
Boring, jacking and Impact moling ........................................
10
10
10
10
10
10
10
11
11
11
11
11
11
12
12
6
Coating inspection prior to laying
7
Ressuretesting
4.1.6
4.2
4.2.1
4.2.2
be
iew
5.2.3
53.
ev
5
51.
52
5:2.1
5.2.2
Pr
4.3
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.5
4.6
4.7
4.7.1
4.7.2
or
Inspection ceftificates for components .....................................
Othersteels..
......................................................
Steel pip8 .........................................................
.‘. ..................................
Pi e standard ...................
VQallthickness
......................................................
Pipeline components ..................................................
Electrically insulating couplings and connections ...............................
Type test
Strength te&@1 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :
......................................................
Tightnesstest
Electrical test .......................................................
lnspection certificates .................................................
Valves
Insulatio8~/C’o;;oSi’on’p~OieCiiò~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Selection of pipeline components .........................................
Off-take connections made of straight pipes .................................
Oth8f pipeline COmpOn8ntS
.............................................
eld
........................................
.....................................................
Annexes
Annex A
(informative)
Handling, transportation
Annex B
(informative)
Deflection
Annex C
(informative)
BibliowaDhv
and storage
...........................
.............................................
............................................
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8
8
8
0
8
0
8
8
12
12
13
15
16
prEN
Page
1200802:1995
3
Foreword
This document describes the functional requirements for gas supply through steel pipe systems at pfessutes up
to 16 bar MOP. It appiies to their materials, design, consttuction, commissioning, opefation and mintenance
in order to provide a safe and ~ec~t8 supply of gas.
Vo
Thera is a complete suite of functional standards pfepafed by CENTTC 234 Gas Supply to cover all parts of the
gas supply system from the input of gas to the transport system through to the installation pip8 immediateiy
befof the gas burning appliances, whether fof domestic, commercial of industtial pufposes. A complete list of
the functional standatds ptepafed by TC 234 is given in annex C to this standard. This functional standard is
listed as work item EN . . (WI 20) (Note unless Oth8fwiS8 stated reference to any work item, eg. WI 20, means
a work item of TC 234).
l l
Work Item 06 gives the general functional fequifements for gas supply through pipe systems up to and including
16 bar MOP, as shown in the diagram. Work Item 7, 20, 21 give fufthef detail for gas supply systems in Polyethylene EN... [Wl. 71 and for the renovation of existing gas supply systems EN... (WI 21). A standafd WI 8
covers the purging, commissioning, decommissioning, recommissioning and pressure testing of gas supply
systems. Work Items 6, 7, 20, 21 and 8 form a complete set of recommendations for gas supply systems in
the pressure range up to and including 16 bar MOP. In preparing theabove documents it bas been assumed that
the reader has a basic understanding of gas supply .
or
In the gas industry the terms distribution and transmission of gas are commonly used to denote parts of the
pipe system. This standard is for gas supply systems but reference is stil1 made to distribution and transmission
activities. For case of undetstanding the relevant terms are defined.
be
ev
Pr
For historie reasons there are no common definitions for the systems called transmission or distribution systems
in the member states. Therefore to provide for full continuity in gas supply systems reference also needs to be
made to ether standards in the annex, eg. for pressure regulating installations EN ...*. (Wl 15), EN . . . (WI 16),
for metering installations to prEN 1776 and to EN . . . (Wl 01 and 02) installation pipes, which are the pipes
taking gas to the appliances. Some distribution systems may also operate at pressures above 16 bar MOP. For
these systems reference should be made to ptEN 1594. Standard prEN 1594 gives normative references for the
welding procedures appropriate to steel gas supply systems up to and including 16 bar MOP.
iew
Gas supply systems are highly complex and the paramount importante of safety traditionally placed on their
creation and use has led to the development of vety detailed codes of practice and operating manuals in the
member states. These detailed statements embrace recognised high standards of gas engineering and the
specific requirements imposed by the legal structures of the member states.
The m8mb8f states coveted by this standard are:
Austria l
Belgium l
Denmark*
Finland *
France l
Germany l
Greece
Iceland
Ireland l
Italy l
Luxemboutg
Netherlands*
eld
The text of standards EN . . . (WI 61, EN..(Wl 7, 20, 21) and EN . . . ( WI 8) contain the ptinciples that are
common to the detailed Codes of Practice and operating manuals in the member states. These principles have
been extracted to form a standard of the functional requirements for gas supply systems. Any national standard
if existing shall comply at least with the requirements of this functional standard. NO ether CEN standard
supersedes this standard for gas supply systems up to and including 16 bar.
Norway *
Poftuaal l
Spain
Sweden *
Switrerland *
United Kingdom*
The asterisk denotes member states participating difectly in the drafting pfocess.
This standard also gives reference to relevant European and other recognised standards for the products that
are used to construct and operate gas supply systems. Thete are further references in EN . . . (WI 06), EN . . . (Wl
07, 21) and in EN . . . . (WI 08) to relevant standards that have been cOnsult8d and to standards organisations
that have co-operated in the formation of this functional standatd.
0 Introduction
(Wl 6) gives nofmative and informative references for gas supply systems up to and
Th8 standard EN
including
16
bar
MOP.
.
l
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Page 4
prEN 12008-2:1995
This standard EN . . . (WI 20) covers the functional requirements of steel systems and should be read in conjunction with EN ma(WI 06) and also with prEN 1594 which gives normative teferences fot welding procedures
appropriate to steel gas supply systems up to and including 16 bar MOP.
l
The requirements of this standard are based on safe gas engineering practice under conditions normally
encountered in the gas industry. Requirements for all abnormal of unusual conditions cannot be specifically
provided for, nor are all engineering or construction details prescribed.
Procedures for the pressute
testing, purging, commissioning, decommissioning of st&
to and including 16 bar MOP are given in EN am(WI 08).
gas supply systems up
l
Vo
In most countries the safety and reliability of gas supply is subject to national legislation and/or regulation. In
the absente of a European directive on gas supply requirements the national legislation applies.
For instance national laws or tegulations at various levels may apply to detailed aspects.
EXAMPLE 1: The
US8
of some materials may be restricted to c8rtain circumstances.
EXAMPLE 2: Values for depths of cover ot clearance may be more stringent.
EXAMPLE 3: Maximum pressure levels and set points may be required.
or
Existing industrial safety regulations pertaining to werk areas, safety devices, and safe werking practices are
not intended to be supplanted by this standard.
Managers with responsibilities for the creation and operation of steel gas supply systems shall-have regard to
the requirements of this standard and to ether relevant standards. It is the responsibility of these managers and
engineers to apply this standard, supplemented with other proven safe practice to the particular circumstances
of each particular gas supply system. These requirements also apply to the development of gas supply
technology and practice which should not be limited by this standard.
Pr
1 scope
iew
ev
be
This functional standard is applicable for steel gas supply systems supplying the families of gases specified in
Table 1 of EN 437 at pressures up to and including 16 bar MOP. This standard applies to tha materials, design,
construction and testing of new steel gas supply systems and the extension of existing systems.
This standard does not apply to the materials, design, construction and testing of gas supply systems in use
prior to the publication of this standard. Howevet, this standard applies to the operation, maintenance and
renovation of all gas supply systems.
2 Normative References
eld
This standard incorporates by dated ot undated references, provisions from other publications. These normative
references are cited at the appropriate places in the text and the publications are listed hereafter. For dated
references, subsequent am8ndmentS to 01 revisions of any of these publications apply to this standard only
when incorporated in it by amendm8nt 01 revision. For undated references the latest edition of the publication
referred to applies.
EN 437
Test gases, test pressures and appliance categories.
prEN 1594
Pipelines for gas transmissions.
EN 10204
Metallic products; types of inspection documents
prEN 10208-1
Steel pipes for pipe lines fot combustible fluids - Technical delivery conditions
Part 1: Pipes of requirement class A
prEN 10208-2
Steel pipes for pipe lines for combustible fluids - Technical delivery conditions
Part 1: Pipes of requirement class B
EN 10220
Plain and steel tubes,
l8ngth
ptEN 10226-1
Pipe thteads where pressure tight joints are made on the threads
Part 1: Designation, dimensions and tolerances
EN 45004
General
EN . . . (WI 06)
Functional requirements for the materials, design, construction, operation,
maintenance and renovation of gas supply systems up to and including 16 bar
Part 1 t General
and seamless, dimensions and
t’MSS8S
per unit
criteria for the operation of bodies performing inspection
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