IS 11790 : 2024 Preparation of Butt Welding Ends for Pipes, Valves, Flanges and Fittings - Code of Practice
1 SCOPE
1.1 This standard covers the preparation of butt welding ends of pipes, valves, welding neck flanges and pipe fittings. It is also applicable to other piping components which are connected to piping system by butt welding.
1.2 Materials for piping components for which these welding ends are primarily intended are carbon and alloy steels. They may also be used for nonferrous materials, upon satisfactory qualifications of welding procedures for the particular material.
1.3 The standard includes requirement for re-entrant shapes for heavy wall ends, welding bevel profiles, inside contours, for joints made with or without backing rings and internal and machining dimensions with their tolerances. The preparation of backing rings, if any, must be specified in ordering material to this specification.
1.4 This standard covers welding end preparation for four general types of joints but does not prescribe specific types of welding processes nor procedures. The four types of joints are:
a) No backing ring;
b) Split or non-continuous backing ring;
c) Solid or continuous backing ring; and
d) Consumable insert ring.
1.5 This standard also covers welding end preparation for gas tungsten arc welding (GTAW) of the root pass.
2 REFERENCES
This standard given below contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated was valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of this standard:
| IS No. | Title |
| IS/ISO 3183 : 2019 | Petroleum and natural gas industries - Steel pipe for pipeline transportation systems (second revision) |