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pressure testing a house gas line ? Tim 04-24-2008
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Posted by Tony Hwang on April 26, 2008, 1:03 pm
John Gilmer wrote:
>>normal gas line pressure is only a couple psi.
>
>
> If that!
>
> Gas pressure is usually measured in "Inches of Water."
>
> 30' of water is about 15 psi. 1 psi is about 2' or 24" of water.
>
>
>
>
> ** Posted from http://www.teranews.com **
Hi,
Are you sure 1 psi = 2 feet of water column?

Posted by Speedy Jim on April 26, 2008, 3:29 pm
Tony Hwang wrote:

> John Gilmer wrote:
>
>>> normal gas line pressure is only a couple psi.
>>
>>
>>
>> If that!
>>
>> Gas pressure is usually measured in "Inches of Water."
>>
>> 30' of water is about 15 psi. 1 psi is about 2' or 24" of water.
>>
>>
>>
>>
>> ** Posted from http://www.teranews.com **
>
> Hi,
> Are you sure 1 psi = 2 feet of water column?


Close enuf.
http://www.iprocessmart.com/techsmart/pressure_help.htm

An easy way to remember it is: "half a pound per foot..."

Jim

Posted by John Gilmer on May 7, 2008, 11:02 am


> http://www.iprocessmart.com/techsmart/pressure_help.htm
>
> An easy way to remember it is: "half a pound per foot..."
>
> Jim

I always start with the "fact" that one atmosphere of pressure is aboutg 30'
of water and about 15 psi. Folks can substitute 31.? and 14.7 but our
approximation is definitely "gud enuf."


** Posted from http://www.teranews.com **

Posted by Rudy on April 25, 2008, 7:30 pm
> normal gas line pressure is only a couple psi.

around here, its ONE HALF PSI


Test pressure on the gauge was 15# IIRC



Posted by HeyBub on April 24, 2008, 8:56 pm
Tim wrote:
> I am going to add a short run from my main inside gas line to service
> a new cooktop. It will only be about a 10 ft run...the service line
> is in the ceiling a little over from the range location. Question
> is...do you normally test the new line from the meter to the rest of
> the system...and what is the normal pressure in an inside gas line
> (black pipe throughout)...looks linke am 1" or 1 1/4" run ?
>
> I used to work for the gas company in Chicago a long time ago when I
> was out of school for awhile...we laid...welded...and tested hundreds
> of 2" lines in the time I was there. I would rather pressure test
> than use the old soapy bubble test.
>
> Any additional help/guidance will be appreciated.
>


Blow up a balloon. Put it on the pipe. Does the balloon shrink?

The pressure from the balloon will be greater than anything the pipe will
ever see.



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