Pressure for boiler test

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Dave 1234
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Post by Dave 1234 » Fri. Sep. 22, 2017 2:51 pm

Guys I need to test a tube type EFM boiler. What is a safe pressure ? Yes, with water.

Thanks Dave

 
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coaledsweat
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Post by coaledsweat » Fri. Sep. 22, 2017 3:01 pm

15# would be enough would think. If it can hold it for 24 hours it's gold star time.

 
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gaw
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Post by gaw » Fri. Sep. 22, 2017 3:18 pm

Your safety valve will open at 30 psi. I would hook a hose to it and fill her up and pressurize it to 30 psi or a little above and see if she holds. You should have at least 30 psi water pressure in your pipes so nothing special is required.

 
Pacowy
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Post by Pacowy » Fri. Sep. 22, 2017 3:28 pm

I believe there is a code spec that the minimum testing pressure is equal to 1.5 times the psi rating of the PRV and the maximum test pressure is equal to 90% of the boiler test pressure set by the manufacturer. So, in a hot water system with a 30 psi PRV, the minimum testing pressure would be 45 psi.

Mike


 
Dave 1234
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Stoker Coal Boiler: 1948 International boiler, EFM S-20 stoker
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Post by Dave 1234 » Fri. Sep. 22, 2017 6:30 pm

THANK YOU !

Mike I'll try the 45 lbs. Did not want to over pressure for no reason. A quick air only test found a bad DHW coil already. If thats all I find I'm a happy guy. It's a nice old 700 , real clean inside and out .

Dave

 
Dave 1234
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Posts: 788
Joined: Tue. Nov. 13, 2012 9:05 am
Stoker Coal Boiler: 1948 International boiler, EFM S-20 stoker
Coal Size/Type: Buck,

Post by Dave 1234 » Sat. Sep. 30, 2017 10:33 am

Test went well, a plug was weeping and the DHW coil had a pinhole too . She held 50 psi for 24 hrs. so I'm happy with that. I never tried to re-tubed a boiler, and this 700 was to nice . I prob would have done it if she was a leaker.

Dave

 
Pacowy
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Joined: Tue. Sep. 04, 2007 10:14 pm
Location: Dalton, MA
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite

Post by Pacowy » Sat. Sep. 30, 2017 10:50 am

Congrats. Glad the issues were manageable and that your 700 gets a new life!

Mike

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