Mystery overheat and hot fresh bilge water - MD2020

[pvb]

Indeed it is getting tedious Pete, regardeless of theory it happens, I see it happen from time to time in my daily grind ergo I know it happens from time to time and sometimes replacing the PRV does not cure it but balancing or an accumulator does, sometimes practical obsevation and memory of a decent sized sample is more useful in diagnosis than theory. The first cal is, I agree and have previously said the PRV, but it is not always the case and simply assuming it is when other factors are present e.g. the unusually high temperature expeienced in this case when all was previously OK is not the way to go. For instance I now easily exclude a PRV with a five minute pressure test so know if its that or not, so can save the time fitting one when it is not needed, and it isnt always the PRV at fault.

So you'd now agree that expansion of the water due to temperature wouldn't cause repeated large leaks in "a couple of minutes"?

 

[David2452]

So you'd now agree that expansion of the water due to temperature wouldn't cause repeated large leaks in "a couple of minutes"?

No I wouldn't agree at all there are other factors take into account even actuall boiling in extremis, frankly I'm not so interested as to why it happens but simply that observation shows me it does and the remedies that make it stop happening, that's what my customers pay for, making things happen when they should and not happen when the shouldn't.

 

[pvb]

No I wouldn't agree at all there are other factors take into account even actuall boiling in extremis, frankly I'm not so interested as to why it happens but simply that observation shows me it does and the remedies that make it stop happening, that's what my customers pay for, making things happen when they should and not happen when the shouldn't.

You see, the problem is that you state that the water leak is the result of thermal water expansion, then when I point out how unlikely this is, you start all the defensive blustering.

 

[Keith-i]

Gentlemen, is it a possibility that this particular calorifier has a combined pressure and temperature relief valve as I know many now do. That would perhaps explain the scenario.

 

[pvb]

Gentlemen, is it a possibility that this particular calorifier has a combined pressure and temperature relief valve as I know many now do. That would perhaps explain the scenario.

I don't know of temperature relief valves being common on boat calorifiers, any links?

 

[Keith-i]

Pretty certain I saw it on the C-Warm brochure I was thumbing through the other day, but will try and find my source to confirm.

 

[pampas]

Possible cause may have been thermostat (Engine) sticking?

 

[Ric]

Gentlemen, is it a possibility that this particular calorifier has a combined pressure and temperature relief valve as I know many now do. That would perhaps explain the scenario.

Light bulb moment - yes you care correct. Calorifier is indeed a C-Warm with combined pressure and temperature relief valve. It must just have been doing its job.

 

[pvb]

Light bulb moment - yes you care correct. Calorifier is indeed a C-Warm with combined pressure and temperature relief valve. It must just have been doing its job.

Glad that's sorted! TPRVs aren't very common though on boat calorifiers.

 

[Falling Star]

Yup, that's the one on mine. From the C-Warm (Cleghorn Waring) "Instructions for Temperature and Pressure Relief Valves" info sheet:

If your system has no accumulator or expansion tank, thermal expansion will cause the temperature-and-pressure relief valve to discharge a little hot water every time the stored water is heated. The valve includes a hose connector to allow this water to be drained into the bilge. Eventually, a deposit of scale may build up in the relief valve, preventing it from closing fully. An expansion tank is recommended for this reason.

No expansion tank on mine and I think this is what has happened (again). They also suggest that the valve operation is checked once a month by turning the knob anti-clockwise until it clicks. Must admit that I haven't been doing that. Maybe if it's done then there would be less chance of the scale build-up.

New valve is £51.36 inc p&p

 

[Otter]

You see, the problem is that you state that the water leak is the result of thermal water expansion, then when I point out how unlikely this is, you start all the defensive blustering.

I don't get it, why do you think such casual rudeness is justified on this forum? David is a professional who comes on here to offer free advice based on his experience, we're all grown up enough to decide whether to take his advice or not. Maybe David was right, maybe you proved him wrong, who gives a flying whatsit if you "won" the argument? By all means contradict others but you don't have to berate and attempt to belittle in order for your opinion to be heard.

 

[pvb]

I don't get it, why do you think such casual rudeness is justified on this forum? David is a professional who comes on here to offer free advice based on his experience, we're all grown up enough to decide whether to take his advice or not. Maybe David was right, maybe you proved him wrong, who gives a flying whatsit if you "won" the argument? By all means contradict others but you don't have to berate and attempt to belittle in order for your opinion to be heard.

It wasn't intended as rudeness, it was an observation. It's a forum - views are exchanged, sometimes people get understandably frustrated, especially if posts contain obviously erroneous statements. After all, there are lots of boaters who read these forums and rely on the advice given, so it's important to highlight false statements.

 

[Otter]

It wasn't intended as rudeness, it was an observation. It's a forum - views are exchanged, sometimes people get understandably frustrated, especially if posts contain obviously erroneous statements. After all, there are lots of boaters who read these forums and rely on the advice given, so it's important to highlight false statements.

But it wasn't false, it was an opinion based on his extensive experience and actually turned out to be pretty much the cause. I can't be bothered to forensically trawl through the thread to work out who was right, I just don't get why you and a few others think that the sort of casual rudeness that would be completely unacceptable amongst decent chaps face to face, is acceptable on a technical forum where we're just trying to help one another.

 

[pvb]

But it wasn't false, it was an opinion based on his extensive experience and actually turned out to be pretty much the cause.

Well, actually it was false. He proposed that thermal expansion could cause a leak of maybe 0.5 litre every couple of minutes. I pointed out that this wasn't possible. And his theory certainly didn't turn out to be "pretty much the cause", as you'd know if you'd bothered to read the thread carefully.

I can't be bothered to forensically trawl through the thread to work out who was right...

No, but you're happy to leap to the defence of someone based purely on your prejudice. Still, good to know that the self-appointed forum police are active.

 

[Otter]

Some folks just never get the difference between winning and succeeding.