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

General Information

Status
Published
Publication Date
11-Jul-2019
Current Stage
6060 - International Standard published
Start Date
12-Jul-2019
Completion Date
12-Jul-2019
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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 9624:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 9624:2019(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
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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: 2 ----------------------
ISO 9624:2019(E)
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

© ISO 2019 – All rights reserved iii
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ISO 9624:2019(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 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
---------------------- Page: 4 ----------------------
ISO 9624:2019(E)
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.
© ISO 2019 – All rights reserved v
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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

diameters (d ) from 16 mm to 2 500 mm and nominal pressures up to 25 bar (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. 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 2019 – All rights reserved 1
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ISO 9624:2019(E)

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
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 .
3.2
nominal size

numerical designation of the size of a flange for reference purposes and only loosely related to

manufacturing dimensions
3.3
nominal pressure

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
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
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ISO 9624:2019(E)
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
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 nominal pressure (PN) of the piping system

for which it is designed.

Flange adapters according to Table 1 shall be associated with flanges of same d , from Tables 2, 3 or 4

as relevant.

NOTE 3 The figures are schematic only, to indicate the relevant dimensions. They do not necessarily represent

manufactured components, e.g. flange adapter with special geometry for connecting butterfly valves.

5.2 Butt fusion systems

The dimensions of the spigot ends shall comply with the relevant pipe system standard, e.g. ISO 4427-3.

All dimensions shall be measured in accordance with Figure 1.
© ISO 2019 – All rights reserved 3
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ISO 9624:2019(E)
Key

d nominal (outside) diameter of connecting pipe and nominal (inside) diameter of the socket

D outside diameter of loose backing flange
D bolt hole diameter
D inside diameter of loose backing flange
D pitch circle diameter
D outside diameter of flange adapter head
D outside diameter of flange adapter shank
r radius of shoulder of flange adapter
Figure 1 — Butt fusion systems

For butt fusion systems, the dimensions of the flange adapters shall conform to those given in Table 1.

Table 1 — Flange adapters — Dimensions for butt fusion systems

Nominal outside diame- Outside diameter of Outside diameter of Radius of shoulder of

a b c
ter of pipe and spigot flange adapter head flange adapter shank flange adapter
d D D
n 4 min 5 min
(+0,5 / −0,5)
16 40 22 3
20 45 27 3
25 58 33 3
32 68 40 3
40 78 50 3
50 88 61 3
63 102 75 4
75 122 89 4
The diameter of the spigot shall conform to the relevant product standard.

The actual value of D should be as high as possible to ensure fitness for purpose of the assembly. See Annex C for

higher recommended values of D for PE100 flange adapters.
D shall be measured in the middle of the radius r .
5 f
4 © ISO 2019 – All rights reserved
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ISO 9624:2019(E)
Table 1 (continued)

Nominal outside diame- Outside diameter of Outside diameter of Radius of shoulder of

a b c
ter of pipe and spigot flange adapter head flange adapter shank flange adapter
d D D
n 4 min 5 min
(+0,5 / −0,5)
90 138 105 4
110 158 125 4
125 158 132 4
140 188 155 4
160 212 175 4
180 212 183 4
200 268 232 4
225 268 235 4
250 320 285 4
280 320 291 4
315 370 335 4
355 430 373 6
400 482 427 6
450 585 514 6
500 585 530 6
560 685 615 6
630 685 642 6
710 800 737 8
800 905 840 8
900 1 005 944 8
1 000 1 110 1 047 8
1 200 1 330 1 245 8
1 400 1 540 1 450 8
1 600 1 760 1 650 10
1 800 1 960 1 860 10
2 000 2 170 2 070 10
2 250 2 435 2 320 10
2 500 2 730 2 550 10
The diameter of the spigot shall conform to the relevant product standard.

The actual value of D should be as high as possible to ensure fitness for purpose of the assembly. See Annex C for

higher recommended values of D for PE100 flange adapters.
D shall be measured in the middle of the radius r .
5 f

The dimensions of PN 10 designated loose backing flanges shall conform to those given in Table 2.

© ISO 2019 – All rights reserved 5
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ISO 9624:2019(E)

Table 2 — PN 10 designated loose backing flange dimensions for butt fusion systems

PN 10 designated loose backing flanges
Nominal
outside Bolts
Outside Inside Pitch circle
diameter of
Bolt hole Screw
diameter diameter diameter
Number
pipe
diameter thread
d D D D D n
n min 2 3 1
10 16 90 23 60 14 4 M12
15 20 95 28 65 14 4 M12
20 25 105 34 75 14 4 M12
25 32 115 42 85 14 4 M12
32 40 140 51 100 18 4 M16
40 50 150 62 110 18 4 M16
50 63 165 78 125 18 4 M16
65 75 185 92 145 18 4 M16
80 90 200 108 160 18 8 M16
100 110 220 128 180 18 8 M16
100 125 220 135 180 18 8 M16
125 140 250 158 210 18 8 M16
150 160 285 178 240 22 8 M20
150 180 285 188 240 22 8 M20
200 200 340 235 295 22 8 M20
200 225 340 238 295 22 8 M20
250 250 395 288 350 22 12 M20
250 280 395 294 350 22 12 M20
300 315 445 338 400 22 12 M20
350 355 505 376 460 22 16 M20
400 400 565 430 515 26 16 M24
500 450 670 517 620 26 20 M24
500 500 670 533 620 26 20 M24
600 560 780 618 725 30 20 M27
700 630 895 645 840 30 24 M27
700 710 895 740 840 30 24 M27
800 800 1 015 843 950 33 24 M30
900 900 1 115 947 1 050 33 28 M30
1 000 1 000 1 230 1 050 1 160 36 28 M33
1 200 1 200 1 455 1 260 1 380 39 32 M36
1 400 1 400 1 675 1 470 1 590 42 36 M39
1 600 1 600 1 915
...

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