The T&P (relief) valves are supposed to be tested on a certain frequency.
If you've never heard of water heater rocket launching you should look it
up.  It happens as a result of the T&P getting clogged or stuck shut and
then the thermostat getting stuck on.

https://youtu.be/rGWmONHipVo

If they leak after test it is usually because some calcium deposits got
stuck in the valve seat.  You can assist it slightly by pushing down on the
brass stem that extends from the center of the valve.  This is especially
likely if you have never flush the deposits out of the tank.  As they age,
the spring can simply get weak.

I cycle mine every spring to vent the system and every fall when I'm
flushing and draining.  As far as I know it doesn't leak and I've been
doing it since it was replaced 7 years ago.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD

On Wed, May 27, 2020, 18:04 Robert Abbott via CnC-List <
[email protected]> wrote:

> On 5/27/2020 11:41 AM, Joel Aronson via CnC-List wrote:
>
> As I have said before, replace the relief valve.  It opened occasionally
>> on my Raritan
>>
>>
>
> Joel, question?   Did the relief valve open occasionally only when the
>> engine was running with engine coolant heating the water, or when you were
>> heating water via shore power or just any time at random regardless of
>> whether the water was being heated or the pressure pump on?
>>
>>
>        My leak will occur over the time I leave the boat all shut down.
>
> Rob Abbott
>>> AZURA
>>> C&C 32 - #277
>>> Halifax, N.S.
>>>
>>>
>>>
>>> _______________________________________________
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>>
>> --
>> Joel
>>
>>
>> _______________________________________________
>>
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> Joel
>
>
> _______________________________________________
>
> Thanks everyone for supporting this list with your contributions.  Each and 
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