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pressure testing a house gas line ? Tim 04-24-2008
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Posted by HeyBub on April 25, 2008, 10:06 am
George wrote:
>>
>> I didn't suggest the balloon for the benefit of the building
>> inspector; I suggested it for the homeowner.
>>
>> If you think it's an unacceptable, goofey, idea (and I agree on the
>> goofey part), what is your suggestion for a 1-2oz pressure test?
>>
>> Didn't think so.
>>
>>
> Possibly you don't understand the idea of a pressure test. You test a
> gas line using a pressure much higher than the service pressure but
> still well within the pressure rating of the components to force
> marginal joints to reveal themselves.

Okay, I'll play. What do you suggest for 1-2 lb pressure test? A tire gauge?



Posted by S. Barker on April 25, 2008, 12:54 pm
yes, a 10 psi tire guage would work. But the proper test is at 10psi.

s

> George wrote:
>>>
>>> I didn't suggest the balloon for the benefit of the building
>>> inspector; I suggested it for the homeowner.
>>>
>>> If you think it's an unacceptable, goofey, idea (and I agree on the
>>> goofey part), what is your suggestion for a 1-2oz pressure test?
>>>
>>> Didn't think so.
>>>
>>>
>> Possibly you don't understand the idea of a pressure test. You test a
>> gas line using a pressure much higher than the service pressure but
>> still well within the pressure rating of the components to force
>> marginal joints to reveal themselves.
>
> Okay, I'll play. What do you suggest for 1-2 lb pressure test? A tire
> gauge?
>



Posted by S. Barker on April 25, 2008, 12:53 pm
the suggestion is 10 psi for 15 minutes just like stated before. very
simple with a shrader valve, a pressure guage, some reducing bushings and a
't'. and a simple manual tire pump can supply the pressure. so using the
excuse of not having a compressor is not valid either.


s

> Sac Dave wrote:
>>>> 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.
>>
>>
>> I'd love to see a building inspector face looking at that. You know
>> your talking about a gas line in a house , a leaky gas line can cause
>> an explosion ( happens all the time ) They have proper test for a
>> reason I don't think a balloon in the end of a pipe is very good
>> advice.
>
> I didn't suggest the balloon for the benefit of the building inspector; I
> suggested it for the homeowner.
>
> If you think it's an unacceptable, goofey, idea (and I agree on the goofey
> part), what is your suggestion for a 1-2oz pressure test?
>
> Didn't think so.
>



Posted by Sac Dave on April 24, 2008, 9:31 pm

>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.
>
> TR
>
The right way would be to buy a test gauge Pump the whole system up with a
bike pump only needs 10 psi for a couple hours. Put the gauge were the new
cook top will be. You will most likely have to shut of all the valves to any
gas fired equipment ( water heater Furnace ect.) You might be able to start
the additional line with a valve Make sure the valve has WOG on it ( water
oil gas ) then just shut that off test the additional pipe. It's always best
to soap all the joints as an extra precaution I always use about 5 wraps of
Teflon tape on the treads then use rectorseal ( pipe dope ) Just to be safe
you might leave the gauge on the line until your ready to hook up the new
cook top that's the advantage of an in line valve .
http://www.amazon.com/dp/B000FH6GP6?smid=A9HNR4I8RXLVW&tag=nextag-tools-tier4-20&linkCode=asn



Posted by Big_Jake on April 25, 2008, 8:22 pm
> 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.
>
> TR

I can't believe that, after around 15 responses, nobody has a clue on
this. Pressure to an appliance, in the US, is about 10 inches on a
water column. 1 psi is equal to 27.71 inches on a water column (at
sea level).

The other posters are right though, it makes sense to test at a higher
pressure. \

JK

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