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Old 10-09-2012, 11:25   #46
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Re: High Fresh Water Pressure When Running Motor

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The valve WATTS Relief Valve, 1/2 In, Brass, M x FNPT - Relief Valves - 1X624|530-1/2 - Grainger Industrial Supply should blow before a clamped hose comes off I assume! So I would just T it into the line from the hot water tank, drain to the bilge.

Have to scout out on the boat where I can put the tank ProFlo Thermal Expansion Tank 2 Gallon - FreshWaterSystems.com on the boat.

what pressure should the tank be set at?
[EDIT] Sorry, took out the valve reference, the model quoted is better suited for the task and a little harder to find[/EDIT]

Can you measure the pressure on your water system when it is running normally? That should be the tank setting. If you can't measure, you might be able to see pressure settings on the pump controller. Failing all of that, IME most boat systems are relatively low pressure, 20-30 psig.
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Old 11-09-2012, 09:49   #47
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Re: High Fresh Water Pressure When Running Motor

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Originally Posted by phantomracer View Post
T
what pressure should the tank be set at?
By default its probably set at 40 psig, which is a little high for a boat system. I would set it at 20-25 psig.
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