SIST EN ISO 27509:2021
(Main)Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020)
Petroleum and natural gas industries - Compact flanged connections with IX seal ring (ISO 27509:2020)
This document 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 expressed in accordance with ASME B36.10M and ASME B36.19M.
This document 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 document is applicable within a temperature range from −196 °C to +250 °C.
This document is not applicable for external pressure.
Erdöl- und Erdgasindustrie - Kompakte Flanschverbindungen mit IX Dichtungsring (ISO 27509:2020)
Industries du pétrole et du gaz naturel - Raccordements à brides compactes avec bague d'étanchéité IX (ISO 27509:2020)
Industrija za predelavo nafte in zemeljskega plina - Kompaktni prirobnični konektorji s tesnilnim obročem IX (ISO 27509:2020)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 27509:2021
01-februar-2021
Nadomešča:
SIST EN ISO 27509:2014
SIST EN ISO 27509:2014/AC:2014
Industrija za predelavo nafte in zemeljskega plina - Kompaktni prirobnični
konektorji s tesnilnim obročem IX (ISO 27509:2020)
Petroleum and natural gas industries - Compact flanged connections with IX seal ring
(ISO 27509:2020)
Erdöl- und Erdgasindustrie - Kompakte Flanschverbindungen mit IX Dichtungsring (ISO
27509:2020)
Industries du pétrole et du gaz naturel - Raccordements à brides compactes avec bague
d'étanchéité IX (ISO 27509:2020)
Ta slovenski standard je istoveten z: EN ISO 27509:2020
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 27509:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 27509:2021
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SIST EN ISO 27509:2021
EN ISO 27509
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 23.040.60 Supersedes EN ISO 27509:2012
English Version
Petroleum and natural gas industries - Compact flanged
connections with IX seal ring (ISO 27509:2020)
Industries du pétrole et du gaz naturel - Erdöl- und Erdgasindustrie - Kompakte
Raccordements à brides compactes avec bague Flanschverbindungen mit IX Dichtungsring (ISO
d'étanchéité IX (ISO 27509:2020) 27509:2020)
This European Standard was approved by CEN on 12 February 2020.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 27509:2020 E
worldwide for CEN national Members.
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SIST EN ISO 27509:2021
EN ISO 27509:2020 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 27509:2021
EN ISO 27509:2020 (E)
European foreword
This document (EN ISO 27509:2020) 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 2021, and conflicting national standards shall be
withdrawn at the latest by June 2021.
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 27509:2012.
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 27509:2020 has been approved by CEN as EN ISO 27509:2020 without any modification.
3
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SIST EN ISO 27509:2021
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SIST EN ISO 27509:2021
INTERNATIONAL ISO
STANDARD 27509
Second edition
2020-12
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 27509:2020(E)
©
ISO 2020
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SIST EN ISO 27509:2021
ISO 27509:2020(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: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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SIST EN ISO 27509:2021
ISO 27509:2020(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviations and symbols . 2
4.1 Abbreviated terms . 2
4.2 Symbols . 3
5 Design . 5
5.1 General . 5
5.2 Design principles . 6
5.3 Assembly requirements . 8
5.4 Standard components . 8
5.5 Units of measurements . 9
5.6 Rounding . 9
5.7 Conformance with piping design codes . 9
5.8 Conformance with this document .10
6 Designation .10
6.1 Designation of flanges .10
6.2 Designation of seal rings .10
7 Materials .11
7.1 General .11
7.2 Flange materials.11
7.3 Bolting materials .11
7.4 Seal ring materials .12
8 Strength, pressure/temperature ratings and leak tightness .13
8.1 General .13
8.2 Pressure/temperature ratings .13
8.3 Pressure testing and leak tightness .14
9 Dimensions of flanges .14
9.1 General .14
9.2 Weld neck dimensions .15
9.3 Blind flange (BL) dimensions .23
9.4 Integral flange (IF) dimensions .26
9.5 Rigid interface dimensions .37
9.6 Dimensions of paddle blanks (PB) and paddle spacers (PS) .39
9.7 Handle and lifting lugs .41
9.8 Dimensions of orifice spacers (OS) .42
9.9 Dimensions of reducing threaded flanges .44
9.10 Auxiliary connections .45
9.11 Flange tolerances .45
9.12 Surface finish .47
10 Marking of flanges.48
10.1 Flanges other than integral flanges .48
10.2 Manufacturer's name or trademark .48
10.3 Nominal size .48
10.4 Pressure class designation .48
10.5 Pipe dimensions .48
10.6 Material identification .48
10.7 Identification of internally threaded flanges .49
© ISO 2020 – All rights reserved iii
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SIST EN ISO 27509:2021
ISO 27509:2020(E)
10.8 Material traceability .49
10.9 Marking examples .49
10.10 Stamping .49
11 Dimensions of seal rings .49
12 Manufacture, testing and inspection of IX seal rings .53
13 Coating and colour coding .53
14 Marking of seal rings .54
15 Quality management systems .54
16 Bolt dimensions and masses .54
Annex A (normative) Pressure temperature ratings and load capacity .55
Annex B (normative) Integral flange angle selection .59
Annex C (normative) Bolt dimensions and masses .70
Annex D (normative) Handling, installation, assembly and repair of flanges .77
Annex E (informative) Mass of flanges .90
Annex F (informative) Metric bolting .100
Annex G (informative) Additional information on bibliographical references .102
Bibliography .104
iv © ISO 2020 – All rights reserved
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SIST EN ISO 27509:2021
ISO 27509:2020(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 6, Processing
equipment and systems, 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 second edition cancels and replaces the first edition (ISO 27509:2012), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 27509:2012/Cor.1:2013. The main changes
compared to the previous edition are as follows:
— Annexes B and D (Annex E in previous edition) have become normative annexes;
— more stringent quality requirements regarding manufacture of products and assembly instructions
have been introduced. These include
a) ultrasonic testing of products in accordance with new requirements in ASME VIII div. 2 (in
Clause 7),
b) requirements to material strength and machining strictly in accordance with given tolerances
for IX seal rings (in Clause 12),
c) new and better coating requirements for IX seal rings (in Clause 13 and Annex D),
d) excluding use of IX seal rings to assist alignment by transfer of significant shear load during
assembly (in Annex D),
e) more comprehensive and detailed guidelines on the evaluation of damages to products and the
repair of such damages (in Annex D),
f) more comprehensive requirements to qualification of bolt tensioning procedures (in Annex D),
and
© ISO 2020 – All rights reserved v
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SIST EN ISO 27509:2021
ISO 27509:2020(E)
g) the elastoplastic deformation of flanges by first assembly has been better explained in 5.3
and in Annex D, in order to prevent unnecessary re-machining or rejection when flange bevel
angles have changed.
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.
vi © ISO 2020 – All rights reserved
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SIST EN ISO 27509:2021
ISO 27509:2020(E)
Introduction
This document, which is originally based on NORSOK L-005, has been developed to provide an
International Standard for compact flanged connections that constitutes an alternative to conventional
flanges as specified in ASME standards, European standards and other 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 conform with
the requirements of this document.
This document has been developed for use in process piping systems, which are designed in accordance
with codes for pressure piping, e.g. ASME B31.3. See 5.7 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 document.
The main body of this document 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, and
— requirements to designation and marking of finished products.
Annexes A, B, C and D cover the following topics:
— structural capacity equations for flange assemblies;
— how to apply the flanges to special geometries of valves and equipment nozzles;
— bolt dimensions and masses;
— installation and assembly instructions, and guidelines on how to repair damage and irregularities
on sealing surfaces.
Annexes E, F and G cover the following topics:
— masses of all standard components;
— suitable dimensions of alternative metric bolting;
— additional information on bibliographical references.
In this document, the following verbal forms are used:
— "shall" indicates a requirement;
— "should" indicates a recommendation;
— "may" indicates a permission;
— "can" indicates a possibility or a capability.
© ISO 2020 – All rights reserved vii
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SIST EN ISO 27509:2021
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SIST EN ISO 27509:2021
INTERNATIONAL STANDARD ISO 27509:2020(E)
Petroleum and natural gas industries — Compact flanged
connections with IX seal ring
1 Scope
This document 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 expressed in accordance with ASME B36.10M and ASME B36.19M.
This document 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 document is applicable within a temperature range from −196 °C to +250 °C.
This document is not applicable for external pressure.
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 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions
and surface texture parameters
ISO 4288, Geometrical 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
EN 1591-4, Flanges and their joints — Part 4: Qualification of personnel competency in the assembly of the
bolted connections of critical service pressurized systems
EN 1779, Non-destructive testing — Leak testing — Criteria for method and technique selection
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 B31.3:2018, Process Piping
© ISO 2020 – All rights reserved 1
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SIST EN ISO 27509:2021
ISO 27509:2020(E)
ASTM B568, Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
ASTM B571, Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
ASME VIII Div. 2: Boiler and Pressure Vessel Code — Alternative Rules
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
class
CL
pressure class in accordance with specific values
Note 1 to entry: The values shall be in accordance with ASME B16.5 and ASME B16.34
3.2
compact flanged con
...
SLOVENSKI STANDARD
oSIST prEN ISO 27509:2019
01-september-2019
Industrija za predelavo nafte in zemeljskega plina - Kompaktni prirobnični
konektorji s tesnilnim obročem IX (ISO/DIS 27509:2019)
Petroleum and natural gas industries - Compact flanged connections with IX seal ring
(ISO/DIS 27509:2019)
Industries du pétrole et du gaz naturel - Raccordements à brides compactes avec bague
d'étanchéité IX (ISO/DIS 27509:2019)
Ta slovenski standard je istoveten z: prEN ISO 27509
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
oSIST prEN ISO 27509:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 27509:2019
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oSIST prEN ISO 27509:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 27509
ISO/TC 67/SC 6 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2019-06-14 2019-09-06
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
ICS: 23.040.60
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED FAST TRACK PROCEDURE
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 27509:2019(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 2019
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
Contents
Foreword . vi
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviations and symbols . 3
4.1 Abbreviated terms . 3
4.2 Symbols . 3
5 Design . 6
5.1 General . 6
5.2 Design principles . 6
5.3 Assembly requirements . 8
5.4 Standard components . 9
5.5 Units of measurements . 9
5.6 Rounding . 9
5.7 Compliance with piping design codes . 9
5.8 Compliance to this document . 10
6 Designation . 10
6.1 Designation of flanges . 10
6.2 Designation of seal rings . 10
............................................................................................................................................................ 11
7 Materials
7.1 General . 11
7.2 Flange materials . 11
7.3 Bolting materials . 11
7.4 Seal ring materials . 12
8 Strength, pressure/temperature ratings and leak tightness . 13
8.1 General . 13
8.2 Pressure/temperature ratings . 14
8.3 Pressure testing and leak tightness . 14
9 Dimensions of flanges . 15
9.1 General . 15
9.2 Weld neck (WN) dimensions . 16
9.3 Blind flange (BL) dimensions . 24
9.4 Integral flange (IF) dimensions . 27
9.5 Rigid interface (RI) dimensions . 39
9.6 Dimensions of paddle blanks (PB) and paddle spacers (PS) . 42
9.7 Handle and lifting lugs . 44
9.8 Dimensions of orifice spacers (OS) . 46
9.9 Dimensions of reducing threaded flanges (RTs) . 47
9.10 Auxiliary connections . 48
9.11 Flange tolerances . 49
9.12 Surface finish . 50
10 Marking of flanges . 51
10.1 Flanges other than integral flanges . 51
10.2 Manufacturer's name or trademark . 51
10.3 Nominal size . 52
10.4 Pressure class designation . 52
© ISO 2019 – All rights reserved iii
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
10.5 Pipe dimensions . 52
10.6 Material designation . 52
10.7 Identification of internally threaded flanges . 52
10.8 Material traceability . 52
10.9 Marking examples . 52
10.10 Stamping . 53
11 Dimensions of seal rings . 53
12 Manufacture, testing and inspection of IX seal rings . 56
13 Coating and colour coding . 56
14 Marking of seal rings . 57
15 Quality management systems . 57
16 Bolt dimensions and masses . 57
Annex A (normative) Pressure temperature ratings and load capacity . 58
A.1 Flange structural capacity . 58
A.1.1 General . 58
A.1.2 Capacity . 58
A.1.3 Loads. 59
A.1.4 Flange utilization ratio. 59
A.1.5 Allowable utilization ratios . 59
Annex B (normative) Integral flange angle selection . 62
B.1 General . 62
B.2 Method 1: Use flange length HW5 and interpolated face angle within thickness range
given in Table 15 to Table 20 . 62
B.3 Method 2: Special flange neck geometries . 62
B.4 Examples . 63
B.4.1 Standard flange length with interpolated face angles . 63
B.4.2 Special flange neck geometries with interpolated face angle from cross-sectional
area estimation (non-standard flange neck geometry) . 64
B.4.3 Special flange neck geometries with interpolated face angle from effective inner
diameter and cross-sectional area estimation . 66
B.4.4 Special flange neck geometries with extrapolated face angle from effective inner
diameter in “extended range” and cross-sectional area estimation . 69
Annex C (normative) Bolt dimensions and masses . 72
Annex D (normative) Handling, installation, assembly and repair of flanges . 80
D.1 General . 80
D.2 Protection. 80
D.3 Flange handling . 80
D.4 Welding . 80
D.5 Painting . 80
D.6 Procedure personnel and equipment for assembly . 81
iv © ISO 2019 – All rights reserved
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
D.7 Preparation before final preloading . 81
D.7.1 Clean and check dimensions and surfaces . 81
D.7.2 IX seal ring – Installation and check for stand-off . 84
D.7.3 Use of lubrication and sealant . 84
D.7.4 Lubrication of nuts and bolts . 84
D.7.5 Alignment . 85
D.7.6 Fitting . 85
D.8 Final pre-loading procedure . 86
D.8.1 Torque tightening . 86
D.8.2 Tightening by hydraulic tensioner . 87
D.9 Maintenance . 88
D.10 Disassembly. 89
D.11 Bolt tensioning qualification procedure . 90
D.11.1 General . 90
D.11.2 Competence management . 90
D.11.3 Torque preloading . 90
D.11.3.1 Background . 90
D.11.3.2 Equipment . 91
D.11.3.3 Calibration and qualification . 92
D.11.3.4 Lubrication procedure . 92
D.11.4 Hydraulic tension preloading
............................................................................................................... 92
D.11.4.1 Background . 92
D.11.4.2 Equipment . 92
D.11.4.3 Qualification and calibration . 93
Annex E (informative) Mass of flanges . 94
Annex F (informative) Metric bolting. 106
Annex G (informative) Additional information on bibliographical references . 108
Bibliography. 110
© ISO 2019 – All rights reserved v
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(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 6, Processing
equipment and systems.
This second edition cancels and replaces the first edition (ISO 27509:2012), which has been technically
revised.
The main changes from the previous edition have been made to reduce risk of mistakes and quality issues,
which have been the major cause to a limited use of the first edition of this document. The main changes
are as follows:
Annexes B and D (Annex E in previous edition) have become normative annexes, because they
contain requirements.
More stringent quality requirements regarding manufacture of products and assembly instructions
have been introduced. These include:
ultrasonic testing of products according to new requirements in ASME VIII div. 2 (in Clause 7);
the importance of stringent requirements to material strength and machining strictly according
to given tolerances for IX seal rings (in Clause 12);
new and better coating requirements for IX seal rings (in Clause 13 and Annex D);
requirements about quality assurance and control and conformance of products according to EN
10204.3.1 (in Clause 15);
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
excluding use of IX seal rings to assist alignment by transfer of significant shear load during
assembly (in Annex D)
more comprehensive and detailed guidelines on the evaluation of damages to products and the
repair of such damages (in Annex D);
more comprehensive requirements to qualification of bolt tensioning procedures (in Annex D).
The elastoplastic deformation of flanges by first assembly has been better explained in 5.3 and in
Annex D, in order to prevent unnecessary re-machining or rejection when flange bevel angles have
changed.
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 27509:2019
ISO/DIS 27509:2019(E)
Introduction
This document, which is originally 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 document.
This document has been developed for use in process piping systems, which are designed according to
codes for pressure piping, e.g. ASME B31.3. See 5.7 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
document.
The main body of this document 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.
The normative annexes A, B, C and D cover the following topics:
structural capacity equations for flange assemblies;
how to apply the flanges to special geometries of valves and equipment nozzles;
bolt dimensions and masses;
installation and assembly instructions, and guidelines on how to repair damage and irregularities on
sealing surfaces.
The informative annexes E, F and G cover the following topics:
masses of all standard components;
suitable dimensions of alternative metric bolting;
additional information on bibliographical references.
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
For the purposes of this document, the following verbal forms apply:
"shall" indicates a requirement strictly to be followed in order to conform to this document 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 document;
"can" is used for statements of possibility and capability, whether material, physical or casual.
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oSIST prEN ISO 27509:2019
ISO/DIS 27509:2019(E)
Petroleum and natural gas industries — Compact flanged
connections with IX seal ring
1 Scope
This document 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 document 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 document is applicable within a temperature range from −196 °C to +250 °C.
This document is not applicable for external pressure.
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 2768-1, General tolerances — Part 1: Tolerances f
...
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