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Re: Natural Gas Pipe selection

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Posted By<" ">Reyn FitzPatrick on March 20, 2002 at 12:44:02:

In Reply to: Natural Gas Pipe selection posted byGIL on March 04, 2002 at 15:18:23:

: I am trying to find the correct pipe size for natural gas pipe to supply a new a/c unit. Could someone please tell me if this is correct:
: A/C Heating BTUh = 72000
: Natural gas BTU/CF= 1025

: 72000/1025= 70.2 CF/hr

: Pressure is 10 psi, before regulator

: Pipe size of 1 inch is fine correct.

Approved gas fired appliances have a rating plate stating the designed input - 72,000 BTU/hour?
Ask your utility for the nominal BTU/cf. It varies from about 900 to 1,100 BTU/cf.
Local building codes will spec out the pipe size.
It's been years since I was in the utility business but the pressure in a houseline, downstream of the meter/regulator was always in the range of 7 to 11 inches water column - about 1/4 pound pressure (psi)= again your utility can tell you what the delivery pressure is.
You also need to know the length of pipe from the meter/regulator to the appliance and be sure to include any other appliances which tap of the line.

If it is the only appliance a run of 1" houseline for less than 20 feet should be adequate. That's a guess, check your local codes.

Good luck, Fitz

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