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International
Standard
ISO 15590-1
Fourth edition
Oil and gas industries including
2024-07
lower carbon energy — Factory
bends, fittings and flanges for
pipeline transportation systems —
Part 1:
Induction bends
Industries du pétrole et du gaz, y compris les énergies à faible
teneur en carbone — Coudes d'usine, raccords et brides pour
systèmes de transport par conduites —
Partie 1: Coudes fabriqués par induction
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms. 5
4.1 Symbols .5
4.2 Abbreviated terms .6
5 General requirements . 6
5.1 Units of measurement .6
5.2 Rounding .6
5.3 Conformity to this document .6
6 Designation . 7
7 Pressure rating and design . 7
8 Purchaser-supplied information . 8
8.1 General information.8
8.2 Additional information.9
8.3 Information on the mother pipe . .9
9 Manufacturing . 10
9.1 Mother pipe.10
9.2 Qualification test bend .10
9.3 Production bending .11
9.4 Post-bending heat treatment .11
9.5 Forming and sizing after bending .11
9.6 Strip/plate end welds . 12
9.7 Jointers and girth welds . 12
9.8 End preparation . . 12
10 Testing and inspection .12
10.1 General requirements . 12
10.2 Extent of testing and inspection . 13
10.2.1 Qualification test bend . 13
10.2.2 Production bends . 13
10.2.3 Production test bends . 13
10.3 Chemical composition . 13
10.4 Physical testing . 13
10.4.1 Test pieces — General . 13
10.4.2 Tensile testing . 13
10.4.3 Charpy V-notch impact testing .18
10.4.4 Through-thickness hardness testing . 20
10.4.5 Surface hardness testing . 20
10.4.6 Metallographic examination . 20
10.4.7 Crack tip opening displacement testing .21
10.4.8 Guided bend testing .21
10.4.9 Flattening tests .21
10.4.10 Retesting .21
10.5 Non-destructive testing . 22
10.5.1 General . 22
10.5.2 Visual inspection . 22
10.5.3 Weld seam testing . 22
10.5.4 Inspection of bend ends . 23
10.5.5 Magnetic particle testing or liquid-penetrant testing on the bend body . 23
10.5.6 Ultrasonic testing on the bend body . 23
iii
10.5.7 Level of residual magnetism . 23
10.5.8 Repairs . 23
10.5.9 NDT personnel . 23
10.6 Dimensions . 23
10.7 Gauging . 28
10.8 Hydrostatic testing . 28
11 Inspection document .28
12 Marking . .28
Annex A (normative) Manufacturing procedure specification (MPS) .29
Annex B (normative) PSL 2S bends ordered for sour service .31
Bibliography .35
iv
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 need
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