help in natural gas distributing system

I need some guide about natural gas distributing system , this system shall provide NG to 11 factories , .........
should I consider pigging for the sub-pipes which its diameter varried from 2' to 6' and its length varried from 200m to 2 Km


By the way gas pressure is 7 bar g

Thanks all

You need a main monitoring station at the main supply tie in and individual monitoring stations at each delivery station. The monitoring station is guided by NFPA codes and has to be located at a definite distnce from the building, fenced(if it is a trunk line) and possibly with a fire protection system depending upon the flow rate and hazardous area classification.
NG lines may be underground or overground. Most cases they are underground to reduce interference with the public utilities.
The depth the pipe may be embedded is dictated by the maximum weight of traffic above and soil pressure.
For 2" to 6" pipes in my opinion pigging should not be required.
However lots of question remains unanswered in ur query. Is it a depressurised or pressurized. If it is a depressurized the temperature may go down below 20 deg C. You may need low temperature carbon steel pipes or carbon steel pipes should suffice.
Welcome any other comments from experts in the community.