The pipe used for liquid line that is up to vapourizer shall be seamless steel pipes as per specifications accepted by distribution company. Pipes of below 50 NB shall be of SCH 80 and pipes of 50 NB and above shall be of SCH 40. Copper tubing manifolds shall not be allowed.

The pipe fittings used shall be forged fittings of SCH 80, as per specifications approved by the distributing company.

All fittings of less than 50 NB shall also be forged fittings of 300 class rating.

No screwed connection shall be allowed. In case, due to any reason screwed connection is used, the pipe used shall be of SCH 80 only.

The valves, sight flow indicator, thermal relief valve, NRV, etc, shall be of 300 class rating.

Only cast steel ball valves with fire safe feature shall be used.

All flanges used shall be of carbon steel, SA105,300 class rating with dimensional standard as per specifications approved by distribution company. No screwed connections should be provided except for the special fitting like excess flow check valve, thermal relief valves (TRV), pressure gauges etc.

All weld joints provided on the line shall be accessible and shall be hydro-tested for 25 kgf/cm2 pressure. The welding shall be fusion welding