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Tài Liệu Tiêu chuẩn về ống gang , phụ kiện ống nước ISO 2531


Thành Viên Mới
Contents Page
Foreword iv
1 Scope 1
2 Normative references 1
3 Terms and definitions .2
4 Technical requirements 5
4.1 General .5
4.2 Pressure classification and dimensional requirements 7
4.3 Material characteristics .11
4.4 Coating and linings for pipes .12
4.5 Coatings and linings for fittings and accessories .13
4.6 Marking .13
5 Leaktightness requirements .13
5.1 Pipes and fittings .13
5.2 Flexible joints .13
5.3 Flanged joints as cast, screwed, welded and adjustable 15
6 Test methods .17
6.1 Dimensions 17
6.2 Straightness of pipes 17
6.3 Tensile test .17
6.4 Brinell hardness 19
6.5 Works leaktightness testof pipes and fittings .20
7 Type tests .20
7.1 Leaktightness of joints to internal pressure .20
7.2 Leaktightness of joints to external pressure 21
7.3 Leaktightness of joints to negative internal pressure .22
7.4 Leaktightness and mechanical resistance of flanged joints 22
8 Tables of dimensions 23
8.1 Socket and spigot pipes .23
8.2 Flanged pipes 25
8.3 Fittings for socketed joints .25
8.4 Fittings for flanged joints .41
1 Scope
This International Standard specifies the requirements and test methods applicable to ductile iron pipes,
fittings, accessories and their joints for the construction of pipelines:
⎯ to convey water (e.g. for human consumption and raw water),
⎯ operated with or without pressure, and
⎯ installed below or above ground.
NOTE In this International Standard, all pressures are relative pressures expressed in bar 1)
This International Standard specifies materials, dimensions and tolerances, mechanical properties and
standard coatings of pipes, fittings and accessories. It also gives performance requirements for all
components including joints.
This International Standard applies to pipes, fittings and accessories cast by any type of foundry process or
manufactured by fabrication of cast components, as well as corresponding joints in the size range DN 40 to
DN 2600 inclusive.
It is applicable to pipes, fittings and accessories which are
⎯ manufactured with socketed, flanged or spigot ends (joint design and gasket shapes are outside the
scope of this International Standard),
⎯ normally delivered internally and externally coated.
Pipes and fittings are classified according to allowable operating 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 4016, Hexagon head bolts — Product grade C
ISO 4034, Hexagon nuts — Product grade C
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
ISO 6506-1, Metallic materials — Brinell hardness test -– Part 1: Test method
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges

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