SIST EN ISO 27509:2014

SLOVENSKI STANDARD
SIST EN ISO 27509:2014
01-januar-2014
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Petroleum and natural gas industries - Compact flanged connections with IX seal ring
(ISO 27509:2012)
Erdöl- und Erdgasindustrie - Kompakte Flanschverbindungen (ISO 27509:2012)
Industries du pétrole et du gaz naturel - Raccordements à brides compactes avec bague
d'étanchéité IX (ISO 27509:2012)
Ta slovenski standard je istoveten z: EN ISO 27509:2012
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
75.180.01 Oprema za industrijo nafte in Equipment for petroleum and
zemeljskega plina na splošno natural gas industries in
general
SIST EN ISO 27509:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 27509:2014

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SIST EN ISO 27509:2014


EUROPEAN STANDARD
EN ISO 27509

NORME EUROPÉENNE

EUROPÄISCHE NORM
December 2012
ICS 23.040.60
English Version
Petroleum and natural gas industries - Compact flanged
connections with IX seal ring (ISO 27509:2012)
Industries du pétrole et du gaz naturel - Raccordements à Erdöl- und Erdgasindustrie - Kompakte
brides compactes avec bague d'étanchéité IX (ISO Flanschverbindungen mit IX Dichtungsring (ISO
27509:2012) 27509:2012)
This European Standard was approved by CEN on 18 December 2012.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 27509:2012: E
worldwide for CEN national Members.

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SIST EN ISO 27509:2014
EN ISO 27509:2012 (E)
Contents Page
Foreword . 3
2

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SIST EN ISO 27509:2014
EN ISO 27509:2012 (E)
Foreword
This document (EN ISO 27509:2012) 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 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 June 2013, and conflicting national standards shall be withdrawn at
the latest by June 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 27509:2012 has been approved by CEN as a EN ISO 27509:2012 without any modification.

3

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SIST EN ISO 27509:2014

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SIST EN ISO 27509:2014

INTERNATIONAL ISO
STANDARD 27509
First edition
2012-12-15

Petroleum and natural gas industries —
Compact flanged connections with IX
seal ring
Industries du pétrole et du gaz naturel — Raccordements à brides
compactes avec bague d'étanchéité IX




Reference number
ISO 27509:2012(E)
©
ISO 2012

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SIST EN ISO 27509:2014
ISO 27509:2012(E)

COPYRIGHT PROTECTED DOCUMENT


©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2012 – All rights reserved

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SIST EN ISO 27509:2014
ISO 27509:2012(E)
Contents Page
Foreword .v
Introduction.vi
1 Scope.1
2 Normative references.1
3 Terms, definitions, symbols and abbreviated terms .2
3.1 Terms and definitions .2
3.2 Symbols.2
3.3 Abbreviated terms .4
4 Design.5
4.1 General .5
4.2 Design principles.5
4.3 Assembly requirements.6
4.4 Standard components.7
4.5 Units of measurements.8
4.6 Rounding.8
4.7 Compliance with piping design codes .8
4.8 Compliance to this International Standard.8
5 Designation .8
5.1 Designation of flanges.8
5.2 Designation of seal rings.9
6 Materials .9
6.1 General .9
6.2 Flange materials .9
6.3 Bolting materials .10
6.4 Seal ring materials.11
7 Strength, pressure/temperature ratings and leak tightness.11
7.1 General .11
7.2 Pressure/temperature ratings .12
7.3 Pressure testing and leak tightness.12
8 Dimensions of flanges .13
8.1 General .13
8.2 Weld neck (WN) dimensions .14
8.3 Blind flange (BL) dimensions.21
8.4 Integral flange (IF) dimensions .24
8.5 Rigid interface (RI) dimensions .31
8.6 Dimensions of paddle blanks (PB) and paddle spacers (PS) .34
8.7 Handle and lifting lugs.37
8.8 Dimensions of orifice spacers (OS).38
8.9 Dimensions of reducing threaded flanges (RTs) .39
8.10 Auxiliary connections .40
8.11 Flange tolerances .40
8.12 Surface finish.42
9 Marking of flanges.42
9.1 Flanges other than integral flanges.42
9.2 Manufacturer's name or trademark .43
9.3 Nominal size.43
9.4 Pressure class designation.43
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SIST EN ISO 27509:2014
ISO 27509:2012(E)
9.5 Pipe dimensions .43
9.6 Material designation .43
9.7 Identification of internally threaded flanges .43
9.8 Material traceability .44
9.9 Marking examples.44
9.10 Stamping.44
10 Dimensions of seal rings .44
11 Inspection and testing of seal rings .48
12 Coating and colour coding .48
13 Marking of seal rings.48
14 Quality management systems.48
15 Bolt dimensions and masses .48
Annex A (normative) Pressure temperature ratings and shear capacity of seal rings.49
Annex B (informative) Integral flange angle selection .54
Annex C (informative) Quality management system .64
Annex D (normative) Bolt dimensions and masses .65
Annex E (informative) Handling, installation, assembly and repair of flanges.71
Annex F (informative) Mass of flanges.84
Annex G (informative) Metric bolting .95
Annex H (informative) Additional information on bibliographical references .97
Bibliography .98

iv © ISO 2012 – All rights reserved

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SIST EN ISO 27509:2014
ISO 27509:2012(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 27509 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing equipment and
systems.
© ISO 2012 – All rights reserved v

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SIST EN ISO 27509:2014
ISO 27509:2012(E)
Introduction
[36]
This International Standard, which is based on NORSOK L-005 , has been developed to provide a standard
for compact flanged connections (CFCs) that constitutes an alternative to conventional flanges as specified in
ASME standards, European Standards and other International Standards, with reduced mass and smaller
overall dimensions, as well as increased reliability in leak tightness by means of its inherent design features
and make up procedures. CFCs can also provide an alternative to other types of clamp and hub type
mechanical connectors.
The use of load carrying sealing elements, traditionally referred to as "gaskets", does not comply with the
fundamental requirements of this International Standard.
This International Standard has been developed for use in process piping systems, which are designed
according to codes for pressure piping, e.g. ASME B31.3. See 4.7 for more details.
The flange designs have been selected to achieve a minimum safety factor of 2,0 when subjected to a design
pressure equal to ASME B16.5 pressure temperature ratings within the temperature limits of this International
Standard.
The main body of this International Standard contains all necessary information on how to manufacture and
supply flange and seal ring materials, such as
⎯ flange dimensions and material requirements;
⎯ seal ring dimensions and material requirements;
⎯ bolting dimensions and material requirements;
⎯ requirements to tolerances and surface finish;
⎯ requirements to designation and marking of finished products.
Normative annexes A and D cover the following topics:
⎯ structural capacity equations for flange assemblies;
⎯ bolt dimensions and masses.
Informative annexes B, C, E, F and G cover the following topics:
⎯ how to apply the flanges to special geometries of valves and equipment nozzles;
⎯ quality management;
⎯ installation and assembly instructions, and guidelines on how to repair damage and irregularities on
sealing surfaces;
⎯ masses of all standard components;
⎯ suitable dimensions of alternative metric bolting.
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SIST EN ISO 27509:2014
ISO 27509:2012(E)
For the purposes of this International Standard, the following verbal forms apply:
⎯ "shall" indicates a requirement strictly to be followed in order to conform to this International Standard and
from which no deviation is permitted, unless accepted by all involved parties;
⎯ "should" indicates that among several possibilities one is recommended as particularly suitable, without
mentioning or excluding others, or that a certain course of action is preferred but not necessarily required;
⎯ "may" indicates a course of action permissible within the limits of this International Standard;
⎯ "can" is used for statements of possibility and capability, whether material, physical or casual.

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SIST EN ISO 27509:2014

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SIST EN ISO 27509:2014
INTERNATIONAL STANDARD ISO 27509:2012(E)

Petroleum and natural gas industries — Compact flanged
connections with IX seal ring
1 Scope
This International Standard specifies detailed manufacturing requirements for circular steel and nickel alloy
compact flanged connections and associated seal rings, for designated pressures and temperatures in class
designations CL 150 (PN 20) to CL 1500 (PN 260) for nominal sizes from DN 15 (NPS ½) to DN 1200
(NPS 48), and for CL 2500 (PN 420) for nominal sizes from DN 15 (NPS ½) to DN 600 (NPS 24).
NOTE NPS is in accordance with ASME B36.10M and ASME B36.19M.
This International Standard is applicable to welding neck flanges, blind flanges, paddle spacers and spacer
blinds (paddle blanks), valve/equipment integral flanges, orifice spacers, reducing threaded flanges and rigid
interfaces for use in process piping for the petroleum, petrochemical and natural gas industries.
This International Standard is applicable within a temperature range from −196 °C to +250 °C.
This International standard is not applicable for external pressure.
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.
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 4288, Geometric Product Specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture
ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-
section conduits running full — Part 1: General principles and requirements
ISO 5167-2:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full — Part 2: Orifice plates
ISO 14313, Petroleum and natural gas industries — Pipeline transportation systems — Pipeline valves
ISO 80000-1:2009, Quantities and units — Part 1: General
ASME B16.5, Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
ASME B16.34, Valves — Flanged, Threaded and Welding End
ASME B1.20.1, Pipe Threads, General Purpose (Inch)
ASME B31.3, Process Piping
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SIST EN ISO 27509:2014
ISO 27509:2012(E)
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: Steel flanges
EN 1779, Non-destructive testing — Leak testing — Criteria for method and technique selection
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
class
CL
ASME pressure class in accordance with ASME B16.5 and ASME B16.34
3.1.2
compact flanged connection
CFC
non-gasketed bolted static pipe connection including two flanges and where the bolt loads are transferred
through metal to metal contact between the flange faces
3.1.3
gasket
barrier to prevent the passage of fluids, but which does transmit all loads between flanges
EXAMPLE As shown in EN 1591-1:2001, Figure 3.
3.1.4
purchaser
individual or organization that buys the pipe connection on behalf of the user and/or operator or for its own use
3.1.5
seal
component providing a barrier to prevent the passage of fluids, transmitting no significant loads between the
flanges
3.1.6
supplier
individual or organization that takes the responsibility for the supply of the pipe connection and its
conformance with this International Standard
3.2 Symbols
A outside diameter of neck
A maximum outer diameter to accommodate standard tools
max
A minimum neck outer diameter listed in Table 7 to Table 12
min
Area cross-sectional area of the neck/pipe calculated from t
015 015
Area cross-sectional area of a special flange neck geometry calculated from t
eqv eqv
B bore diameter, where the bore should not exceed the maximum listed bore in this International
Standard
B maximum listed bore diameter
max
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SIST EN ISO 27509:2014
ISO 27509:2012(E)
B minimum bore diameter for which the face angles are valid
min
B1 minimum bore diameter for flange to be blinded
NOTE B1 is also the start diameter for blind and reducing threaded flange face angles.
BCD bolt circle diameter
d bolt size
B
d average diameter of neck end = (A+B)/2
p
DA1 internal diameter of groove
DA3 outer diameter of groove
DG4 seal ring seal diameter
DW1 inner recess diameter
DW2 outer recess diameter
DW3 outside diameter of flange
DW4 flange to neck fillet outer diameter
e radial distance between BCD and d
p
e (DW3 + DW2)/4 – BCD/2
B
e (DW3 + DW2)/4 –(A+B)/4
p
E1 depth of groove
E2 depth of recess
E3 depth of recess for gasket
F applied axial force
A
F bolt total plastic capacity (root area × number of bolts × yield strength)
cB
F flange axial load capacity without effect of bolt prying
f
F flange axial load capacity including the effect of bolt prying
fP
F end cap force calculated to seal ring seal diameter
end
F resulting force from external tension force F and external bending moment M
R A A
f flange material yield strength at temperature
y
HP1 thickness of PB, PS and OS
HW3 flange thickness
HW5, HT5 overall length
L bolt hole diameter
L1,L2,L3 bolt hole depths
M applied bending moment
A
n number of bolts
2
p internal pressure in N/mm
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SIST EN ISO 27509:2014
ISO 27509:2012(E)
RA radius
RB radius
RC radius (maximum value tabulated)
RV1 neck to flange ring radius on integral flanges
t pipe wall thickness
t minimum neck thickness that can be used which is defined by the standard pipe outer diameter,
min
A, and maximum listed bore diameter, B .
max
t the maximum neck thickness that can be used which is defined by A and the minimum listed
max max
bore diameter
t the wall thickness giving the smallest possible face angle (0,15°)
015
t the wall thickness calculated from a special flange neck geometry
eqv
X half major ellipse axis
Y half minor ellipse axis
αA2 groove angle
αB1 flange face bevel angle
αB2 effective face angle/rear face bevel angle
ψ flange utilization ratio
3.3 Abbreviated terms
BL blind flange
CFC compact flanged connection
CL class
DN nominal pipe diameter (expressed in millimetres)
ID internal diameter
IF integral flange (as part of some other equipment or component)
IX special metallic seal ring applied in Clause 4
LB line blinds (including PS and PB)
NPS nominal pipe size (expressed in inches)
OD outer diameter
OS orifice spacer
PB paddle blank
PN nominal pressure (bar)
PS paddle spacer
PTFE polytetrafluoroethylene
RI rigid interface
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SIST EN ISO 27509:2014
ISO 27509:2012(E)
RT reducing threaded flange
WN weld neck
4 Design
4.1 General
In order to be compliant with this International Standard, CFCs fulfil the minimum design requirements
outlined below.
⎯ They have been designed for face-to-face make-up for transfer of the bolt loading through the flange
faces.
⎯ They have been designed so that a static mode is maintained in the bolted joint up to 1,5 times the
specified pressure/temperature rating, see 7.2. Static mode is maintained as long as the difference
between maximum and minimum nominal stress sustained by the bolts in the joint does not exceed 5 %
of the minimum values specified in Table 3.
⎯ They have been standardized to cover as a minimum the same pressure temperature class designations
and sizes as can be found in ASME B16.5 with equal or better performance.
⎯ They have been standardized to fit with commonly used standards by the valve industry (e.g. ASME
B16.34, ISO 14313 and the EN 12516 series of parts), and other valve standards which make reference
to these standards for pressure design.
⎯ The weakest part of flanged connections according to this International Standard regarding fatigue failure
is always located somewhere in the transition from flange to pipe or flange to nozzle neck of an
equipment or valve. The bolted joint itself is never subjected to fatigue load if considerations to cycling
temperatures are taken when selecting bolt material, see 6.3.
4.2 Design principles
Figure 1 shows the d
...