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kostello

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I think I've got a leak in the coil of my hot water tank.

So this afternoon I've disconnected the coil from the heating system, capped it and pressure tested it.

In 3 hours the gauge has dropped from 40 psi to 34 psi and is still dropping.

Am I right to think it's knackered?

sasha
 

Dibs-h

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When you say disconnected it - I assume you've disconnected both ends of they as the enter\exit the tank, etc.?

In which a pressure loss would mean knackered tank to me.

HIH

Dibs
 

Doug B

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You could always un-cap both ends & put a tub/bucket under the bottom tapping of the coil, if it fills with water you have a leaky coil.
They usually go with a pin hole forming in the coil & the give away signs are that the central heating header tank starts over flowing as the bigger domestic hot water header tank is usually higher & the water is trying to find its own level.

HTH.

Cheers.

Edit, depending on how you`ve capped the ends you could be getting a pressure drop as some plumbing fittings aren`t air tight
 

9fingers

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Also your coil is full of air surrounded by a water jacket and the water temperature could be falling during your test?

pressure is proportional to absolute temperature (kelvin)

Bob
 
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