ISO 9624:2019
(Main)Thermoplastics piping systems for fluids under pressure — Flange adapters and loose backing flanges — Mating dimensions
Thermoplastics piping systems for fluids under pressure — Flange adapters and loose backing flanges — Mating dimensions
This document specifies the mating dimensions for thermoplastic flange adapters and corresponding loose backing flanges intended to be used in thermoplastic piping systems for the conveyance of fluids under pressure. It applies to flange adapters and loose backing flanges for use with pipes with nominal outside diameters (dn) from 16 mm to 2 500 mm and nominal pressures up to 25 bar[1] (PN 25). This document specifies the dimensions of the flange adapters intended to be used for: — butt fusion piping systems; — socket fusion piping systems; — adhesive jointed piping systems. NOTE 1 For specific connections with dimensions (e.g. dn450 or dn630) not covered in this document, or specific equipment (butterfly valves), specific solutions are available on the market. This document is applicable to loose backing flanges made from metal, thermoplastics, or a combination of metal and thermoplastics. This document also provides information on gaskets and gives general recommendations on correct assembling practices. NOTE 2 Industrial applications are not covered by this document. Products intended for industrial application are covered by ISO 15493[1], ISO 15494 or ISO 10931[2]. [1] 1 bar = 0,1 MPa = 105 N/m2.
Systèmes de canalisations thermoplastiques pour fluides sous pression — Collets et brides folles plates — Dimensions de raccordement
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 9624
Second edition
2019-07
Thermoplastics piping systems for
fluids under pressure — Flange
adapters and loose backing flanges —
Mating dimensions
Systèmes de canalisations thermoplastiques pour fluides sous
pression — Collets et brides folles plates — Dimensions de
raccordement
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
5 Dimensions . 3
5.1 General . 3
5.2 Butt fusion systems . 3
5.3 Socket fusion systems . 8
5.4 Adhesive bonded systems . 9
6 Gaskets .12
7 Marking .12
7.1 Minimum required marking of flange adapters .12
7.2 Minimum required marking of loose backing flanges .13
Annex A (informative) Gaskets .14
Annex B (informative) Guidance for the application of the bolt torque .15
Annex C (informative) Recommended dimensions for PE100 flange adapter in relation to
the loose backing flanges PN .17
Bibliography .19
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 138, Plastics pipes, fittings and valves for
the transport of fluids, Subcommittee SC 2, Plastics pipes and fittings for water supplies.
This second edition cancels and replaces the first edition (ISO 9624:1997), which has been technically
revised.
The main changes compared to the previous edition are:
— increase of dimensions up to 2 500 mm;
— technical consistency with industrial applications standards;
— addition of two informative annexes on gaskets and torque application.
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.
iv © ISO 2019 – All rights reserved
Introduction
This document covers the dimensions of flange adapters and loose backing flanges which are commonly
used in the connection of plastic piping systems to valves, pumping stations or other equipment, and to
pipelines of the same or other material. Some equipment (e.g. butterfly valves) may require specific
designs that are not covered by this document.
This revised version of this document covers dimensions allowing the connection of plastic piping
systems up to DN 2500, to answer the increasing demand of large dimensions on the market.
Flanged joints should be able to transfer long-term axial forces with maintained tightness, which
requires use of suitable components and a correct assembly. This revised version includes informative
annexes addressing joint design and torque application and gives bibliographic references to installation
guidelines which are available on the market.
INTERNATIONAL STANDARD ISO 9624:2019(E)
Thermoplastics piping systems for fluids under
pressure — Flange adapters and loose backing flanges —
Mating dimensions
1 Scope
This document specifies the mating dimensions for thermoplastic flange adapters and corresponding
loose backing flanges intended to be used in thermoplastic piping systems for the conveyance of fluids
under pressure.
It applies to flange adapters and loose backing flanges for use with pipes with nominal outside
1)
diameters (d ) from 16 mm to 2 500 mm and nominal pressures up to 25 bar (PN 25).
n
This document specifies the dimensions of the flange adapters intended to be used for:
— butt fusion piping systems;
— socket fusion piping systems;
— adhesive jointed piping systems.
NOTE 1 For specific connections with dimensions (e.g. d 450 or d 630) not covered in this document, or
n n
specific equipment (butterfly valves), specific solutions are available on the market.
This document is applicable to loose backing flanges made from metal, thermoplastics, or a combination
of metal and thermoplastics.
This document also provides information on gaskets and gives general recommendations on correct
assembling practices.
NOTE 2 Industrial applications are not covered by this document. Products intended for industrial application
[1] [2]
are covered by ISO 15493 , ISO 15494 or ISO 10931 .
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 261, ISO general purpose metric screw threads — General plan
ISO 727-1, Fittings made from unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly(vinyl chloride)
(PVC-C) or acrylonitrile/butadiene/styrene (ABS) with plain sockets for pipes under pressure — Part 1:
Metric series
ISO 1452-3, Plastics piping systems for water supply and for buried and above-ground drainage and
sewerage under pressure — Unplasticized poly(vinyl chloride) (PVC-U) — Part 3: Fittings
ISO 4427-3, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 3:
Fittings
ISO 7005-1, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
5 2
1) 1 bar = 0,1 MPa = 10 N/m .
ISO 15494, Plastics piping systems for industrial applications — Polybutene (PB), polyethylene (PE),
polyethylene of raised temperature resistance (PE-RT), crosslinked polyethylene (PE-X), polypropylene
(PP) — Metric series for specifications for components and the system
ISO 15874-3, Plastics piping systems for hot and cold water installations — Polypropylene (PP) — Part 3:
Fittings
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: steel flanges
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:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
3.1
nominal outside diameter
d
n
specified outside diameter, in millimetres, assigned to a nominal size DN/OD
[3]
Note 1 to entry: The nominal outside diameter d of pipes is given in ISO 161-1 .
n
3.2
nominal size
DN
numerical designation of the size of a flange for reference purposes and only loosely related to
manufacturing dimensions
3.3
nominal pressure
PN
numerical designation used for reference purposes related to the mechanical characteristics of the
component of a piping system
Note 1 to entry: For plastic piping systems conveying water (including flange adapters), the PN symbols
correspond to the allowable operating pressure (PFA) in bar, which can be sustained with water at 20 °C with a
[4]
design basis of 50 years, and based on the minimum design coefficient in accordance with ISO 12162 . For loose
backing flanges, the PN symbol is used to indicate its geometrical characteristics.
4 Symbols and abbreviated terms
d nominal (outside) diameter of connecting pipe and flange adapters, and
n
nominal (inside) diameter of the socket
D outside diameter of loose backing flange
DN size designation of loose backing flange
D bolt hole diameter
D inside diameter of loose backing flange
D pitch circle diameter
2 © ISO 2019 – All rights reserved
D outside diameter of flange adapter head
D outside diameter of flange adapter shank
n number of bolt holes
r radius of shoulder of flange adapter
f
5 Dimensions
5.1 General
Loose backing flanges shall be designated by the relevant PN symbol, in consistency with Table 2 to
Table 4, Table 6 or Table 8 as appropriate.
NOTE 1 The values of the outside diameter D of the loose backing flange and the pitch circle diameter D of the
bolts are taken from EN 1092-1.
NOTE 2 The values of the bolt hole diameter D are taken from series medium in ISO 273.
The inside diameter D of the loose backing flange shall conform to the design of the flange adapter.
Unless otherwise specified, the diameters of the flange adapters as specified in Table 1, Table 5 and
Table 7 shall be suitable with the corresponding loose backing flanges, and therefore comply with
ISO 7005-1 using the appropriate tolerances as given in EN 1092-1.
Flange adapters shall be designed in order to prevent stress concentration at any changes in cross
section. The thickness of the flange adapter face and loose backing flange shall be dependent on the
material used in the manufacture of the adapter and on the n
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