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handy007
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| Joined: | Fri Nov 9th, 2007 |
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Posted: Fri Nov 9th, 2007 08:21 pm |
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I've had a 50gal GE (GE SG50T12AVH00) gas hot water tank installed in basement this summer. Hot water is fine. Recently, I have noticed a very loud metal rattling sound coming from the tank. It happens a couple of minutes after the burner has turned off and lasts just a second. It allways happens after a shower or bath. I can hear it anywhere in the 2 story house. It appears the duct work and draft hood is solid. Could the flue baffle be causing this noise?
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eleent
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Posted: Fri Nov 9th, 2007 10:37 pm |
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Hello: I'd check water pressure with a gauge and also look for anything that could get in the way of thermal expansion like a check valve or heat trap. Pressure should be in the 50 to 60 psi range. Sometimes if there is a valve in the way, pressure can rise quickly when reheating and make the sounds you're hearing. Sometimes tanks moan as well. Or, perhaps that's ghosts 
Yours, Larry
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handy007
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Posted: Tue Nov 13th, 2007 03:46 pm |
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| I pulled the flue out and put a bend in it. This seems to have taken care of the loud metallic noise. However, I have noticed that the temp/press relief valve is leaking about a cup of water after a shower. I pressed the thermal expansion tank valve quickly to see if I had air pressure and some water came out. I understand their should be about 10-15lbs of air pressure above water pressure in the thermal expansion tank but should water come out of the air valve? I thought there is a bladder in the T.E.Tank to prevent this. I believe the thermal expansion tank needs replaced, what do you think? It seems your right about an expansion/pressure problem.
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eleent
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Posted: Thu Nov 15th, 2007 04:28 am |
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Hello: If water comes out the air side of the expansion tank, well, how to put this? It has done its last expansion Time for a new one. Contrary to what you've heard, measure the line pressure and pump up the tank, before installing it, to line pressure or up to five pounds more. Most "experts" seem to be within five pounds of agreement  The high water pressure isn't good for the tank. I've had similar pressures collapse the flue, ruining the tank. Might be a good idea to replace the relief valve as well as it seems the present one wasn't doing it's job.
Yours, Larry
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handy007
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Posted: Mon Nov 19th, 2007 06:54 pm |
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Took cold water line pressure, it was 65psi. Installed 2 gal new expansion tank to replace old 2 gal. exp. tank and pumped it up to 65psi a few days ago. Problem of T&P valve weeping during showers is now gone. Very easy fix. 
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eleent
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Posted: Mon Nov 19th, 2007 09:05 pm |
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Hello: Sounds good but for one point. Make sure the tank got pumped up before installing in the line. Otherwise it's possible the filling didn't put in the right amount of air 
Yours, Larry
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