CHH said:. Local code requires a 24 hour test. A little crazy but ya gotta do what ya gotta do...
Wow....how do they discern between a leak and a temperature change over that amount of time.
CHH said:. Local code requires a 24 hour test. A little crazy but ya gotta do what ya gotta do...
CHH said:The max temperature dependent change is about 2 psi. It's a 20 psi test:
4. Subsection 406.4.1 is replaced with the following:
Threaded gas piping shall be tested at 20 psi for a duration of 24 hours. Welded or medium pressure gas piping shall be tested at 60 psi for 24 hours.
winslow said:Typically when cast iron that has been used for a period od time then lies unused can present some problems. The inside dries up then when water runs through them the inner buildup in the pipe breaks loose causing clogs, especially in cast iron stacks. Good luck (sincerely, not sarcastically)
southernnaturelover said:... the new PVC piping ...
leejosepho said:Only for cold water. Hot water needs CPVC.
Just thinking about using a bike pump for last week's test makes my shoulders ache...GrumpyPlumber said:Having schraders on test gauges makes it easier to grab any old bike pump when you don't have a compressor handy.
southernnaturelover said:Would it be best to use CPVC for hot and cold? Even the cold water pipes will get hot occasionally in the attic.
markts30 said:Just thinking about using a bike pump for last week's test makes my shoulders ache...
360' of 4" Sch40 welded gas line to pump up - to 100lbs for our test (60 for inspector at "final" time) - It would have taken me most of the week LOL
We use bike pumps for inflating test balls and that is it...
We use compressors to test larger water mains (over 2-1/2") with air (60lbs) before water testing for our own peace of mind (and for fixing any leaks that might have occurred) and we test all gas installs with air as well.
CHH said:I'm sure some folks around here use Schraders. I don't personally see very many tests.
Isn't the 10 minute, low pressure test in the National Fuel Gas code? I don't know why the locals here think they know better. I'd prefer an accurate low pressure test over a test that is much higher than working pressure and is suject to some uncertainty as Cass pointed out.
In my line of work we do both low and high pressure tests because seals behave differently under different conditions. Of course low pressure is 250 and high is whatever max test rating is for a particular installation, usually 5,000 psi but sometimes 10,000. Those tests are always "stand way back" events.
leejosepho said:Check his initial posts -- he is the oil-field guy.
GrumpyPlumber said:You stole his limelight.
GrumpyPlumber said:I'm one ... who'll sit and watch the science channel show on industrial machinery, or how tin cans are made.
leejosepho said:Oops, please pardon!
Same here.
Did you see the one on toothpicks?
CHH said:The testing and rebuilding of BOPE's is an industry all it's own.
This is awkward, but...
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