Mechanical Piping

OK. Here's a suggestion:

• For gases, keep the average flow velocity below 10m/s, and size the pipes to suit.

Pressure is not an issue.

Dear Sir,

Thanks for your comments but my concern what NB and Schedule piping will i use.

Use the velocity first to calculate the NB: flow is pi times the diameter squared times the velocity divided by 4. Increase the diameter to get the velocity below 10m/s, then the next standard diameter up will do.

Use the pressure against the NB to decide on the schedule. Alternatively, and preferably, follow the end Client's piping standards for the diameter and the contents.

Unless any other CR4 reader knows a better way?

Not sure you are ready for this.

You really need to go to school, or HIRE an engineer.

Natural Gas - Pipe Sizing
It's unsettling that you would even ask such a question.Might as well hand you a loaded gun.

Pipe size 500mm , Schedule Ms40 seamless. Flow 7500 m3/hr at 10m/s velocity.

Recommended gas velocity 8.5 m/s to 15 m/s.

So the Size is ok unless you want to run over 100 metres. Then take a 600 mm size to be totally save with pressure drops.

Gmauthur, these are not done simply asking on CR4 with no layout/dictated parameters/length/line heights/ ambient temperature etc. This is why there are Piping Consultants involved in engineering & then designing.

Thanks for your kind help.

Sir i know for that work designers should be invole but in Japaness company they didn't involve any type of designers thats why i needed ur help.

pipe rack height 7.5 M, Ambient temp, and last user end approx 865 m.

Any other information can i share for better suggestions.

In any Japanies company this type of job is not left with unprofessionals. They will never allow CNG piping to be designed by this type of information.

Is there a Japanese specification/classification for pipeline design that has a designation of DBS-1000? Or DBS^wac-1000?

That would be Designed By Strangers, or Designed By Strangers ^{without a clue}-1000.

I think we do a dis-service to those who are obviously unqualified for the task at hand by providing technical information that is beyond the comprehension of the recipient.

Just my 2 yen's worth.