NATURAL GAS PIPE SIZING (MEDIUM PRESSURE)

[NYOH]

Hello,

I have a question on sizing medium pressure gas pipe. Here is the information:

1. The total gas load is approximately 17,000,000 BTU which equals to 17,000 CFH.
2. Equipments minimum working pressure is 5 inch.H20 and maximum working pressure is 56 inch.H20.
2. Upon submitting this load to the gas utility company, they have sent us an schematic of how new medium pressure gas line and associated devices will be installed.
3. The property is a warehouse with a height of approximately 21 feet.
4. The total linear feet of pipe run from the point where the new 2 inch gas line will enter the warehouse to where the equipment is installed is approximately 150 feet.

I know that new schedule-40 pipe has to be welded. Looking at various "gas pipe design" tables, I need to find out if 4 inch steel pipe will be sufficient to provide 17,000 CFH. What is the maximum CFH and minimum CFH a 4" steel pipe can deliver with 150 feet of pipe length.

Thank you for your help!

 

[ione]

You should refrain from double-posting or at least you should introduce in your OP a link to the other thread (

http://www.eng-tips.com/viewthread.cfm?qid=381558)

 

[LittleInch]

OK, a slightly different question, but to give you an answer you still need to define what is your min and max pressures and inlet pressure. Are they both with the same flow

I did a quick check and 4" is more than sufficient for your needs (17,000 scfh), with less than 5 inches water column difference between meter/ pressure reg and equipment. 2 1/2 " doesn't work, and 3" is getting a bit higher pressure drop (15 to 20 inches)

You need to be quite careful to read the notes on those standard tables as many are for pressure less than 1 psig and for pressure drops of 1 inch or less water column.

note the comments on the diagram about the gas appliance regulators pressure requirements.

Not quite sure why you are so concerned over this??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.