Volume-II of IV - GAIL

1.0 SCOPE
This specification covers the requirements of various piping materials
used in piping/ pipeline system handling natural gas and associate utilities
in the pipeline.
2.0 CODES AND STANDARDS
2.1 Pipeline and terminal facilities envisaged as a part of this project shall be
designed and Engineered primarily in accordance with the provision of
ASME B 31.8- Gas Transmission and Distribution piping system 1995
edition.
2.2 All codes standards and specifications referred herein shall be the latest
edition of such documents.
2.3 For sake of brevity, the intials of the society to which the codes are
referred are omitted in the specification, for example, B16.5 is a code
referring to ANSI/ ASME, A 105 is a code referring to ASTM.
2.4 In addition, MECON specifications for various piping and pipeline
materials shall also be applicable.
3.0 MATERIAL SPECIFICATION
Piping material specifications are classified for the general purpose of
selection of material for the class of services. The maximum design
pressure and design temperature together with the fluid in line governs the
selection of material specifications. Deviation of materials from class
specifications may occure due to specific design condition. These
deviations are permissible if they are equal or better than the individual
class requirements.
4.0 CLASS DESIGNATION CODE
The piping class designation consist of three digits numbering system
made up of letter, number, letter e. g. A1A, B1A, D1A, etc as follows:
First letter indicates ANSI class rating e. g.
A-Class 150
B-Class 300
D-Class 600
The middle number indicates differences in the specification within the
same rating and material.
\\Akjha\work contrac\standard TS for Pipe Line WC (Vol-II) MASTER FOLDER\21B piping material spec\Specification for Piping Materials-021B.doc Page 1 of 6