Copper Tube:
Solid drawn copper tubes of outside diameter 10 mm, 12 mm or 20 mm, as suitable, conforming to IS 2501, shall be used. The wall thickness of the tubes shall be minimum 1 mm and suitable for withstanding 25 kgf/cm2 pressure.

Steel Tubes:
Cold drawn seamless, electric welded, cold drawn electric resistance welded (ERW) or oxyacetylene welded tubes of suitable sizes conforming to IS 3601 shall be used.

Mild Steel Tubes:
Hot finished seamless, or electric resistance welded (ERW) mild steel tubes of suitable size, conforming to medium or heavy class of IS 1239 (Part 1), or any other steel tube approved by statutory authority shall be used.

Cast iron and aluminium fittings shall not be used.

In the case of flange connections, the flanges shall be machined and should preferably have raised face. Metallic/spiral wound metallic gasket of minimum thickness of 1.5 mm is preferable for use. For LPG lines subjected to full cylinder pressure of LPG liquid lines the minimum flange rating shall be 300 class rating.

For LPG lines subjected to full cylinder pressure of LPG liquid lines the minimum flange rating shall be 300 class rating.

A quarter turn emergency shut-off valve (ESOV) designed to work on LPG, shall only be used form a inline for shut-off operation. These are quick shut off valves like ball/plug valves. They should be installed as close as practicable to the point where gas enters the premises to which adequate access shall be provided. If it is installed inside the building it should be close to the entry point. In open position, the lever/key of the ESOV shall be in parallel to the axis of the pipeline on which it is installed. An emergency operating procedure shall be distinctly displayed near the ESOV.