PRV and Pressure vessel

Master of None · Posted: Fri May 15, 2009 11:52 am Post Subject: PRV and Pressure vessel

A friend of mine is on his third heat exchanger on a Sabre combie. Volkara has advised him to install a pressure reducing valve and a pressure vessel on his cold water main. What is the correct order to install these components? ie. Stop cock - pressure vessel - pressure reducing valve. His mains pressure is at 3.5 bar, What pressure should he set the PRV to and pressure vessel charge.

Thankyou.

bengasman · Posted: Fri May 15, 2009 2:51 pm Post Subject:

is it a biflow model?

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Agile · Posted: Fri May 15, 2009 3:04 pm Post Subject:

What was the failure mode of the HE ?

Tony

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Paul Barker · Posted: Fri May 15, 2009 7:03 pm Post Subject:

bengasman wrote:

is it a biflow model?

Unless they've changed it's the vokera compact which is a Band D linea with a recuperator; reliable pedigree.

In any case it has a plate heat exchanger.

OP Put the pressure vessel on the boiler side of the pressure reducing valve.

bengasman · Posted: Fri May 15, 2009 7:15 pm Post Subject:

Surely a plate hex can handle 3 or 4 bar???

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glasgowgas · Posted: Fri May 15, 2009 10:42 pm Post Subject:

Paul Barker wrote:

In any case it has a plate heat exchanger.

er,no it doesn`t.

prv set to 3 bar.
water pressure is 0.5 bar above M.Is
has boiler been repaired under warranty?

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kevplumb · Posted: Fri May 15, 2009 10:45 pm Post Subject:

prv has nowt te de withit howay lad give the old haggis a shake

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glasgowgas · Posted: Fri May 15, 2009 10:50 pm Post Subject:

kevplumb wrote:

prv has nowt te de withit howay lad give the old haggis a shake

sorry kev meant Pressure Reducing Valve that OP mentioned at the start of thread, the one Vokera have told him to fit.

Can only think its warranty repairs being done by Vokera for leaks on hex.

hows life anyway mucker?

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heytesto · Posted: Fri May 15, 2009 11:01 pm Post Subject:

The boiler quotes a maximum 6.0 bar mains inlet.

What I suspect is there is a loose jumper stopcock or non return valve before the boiler. This is allowing pressure to build too high as there is no expansion available.

A pressure reducing valve above the main stopcock (to maintain balanced pressures), and on the boiler inlet, fit a single check valve followed by the mini expansion vessel.

kevplumb · Posted: Fri May 15, 2009 11:02 pm Post Subject:

Quote:

sorry kev meant Pressure Reducing Valve that OP mentioned at the start of thread, the one Vokera have told him to fit.

Can only think its warranty repairs being done by Vokera for leaks on hex.

hows life anyway mucker?

plodding marra just plodding

still trying to fig out how i can get out of getting married (again)

bleeding yanks are worse than pit bulls

it's ok bett don't read this forum

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glasgowgas · Posted: Fri May 15, 2009 11:08 pm Post Subject:

kevplumb wrote:

still trying to fig out how i can get out of getting married (again)

bleeding yanks are worse than pit bulls

fake your own death, tell her your gay,tell her you miss unblocking british lavvy pans

keep your powder dry big man

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Paul Barker · Posted: Sat May 16, 2009 8:44 am Post Subject:

glasgowgas wrote:

Paul Barker wrote:

In any case it has a plate heat exchanger.

er,no it doesn`t.

prv set to 3 bar.
water pressure is 0.5 bar above M.Is
has boiler been repaired under warranty?

it did up to last one I fitted 2 yes ago. when did they change?

Master of None · Posted: Mon May 18, 2009 1:07 pm Post Subject:

Agile wrote:

What was the failure mode of the HE ?

Tony

Fracture I believe

heytesto wrote:

The boiler quotes a maximum 6.0 bar mains inlet.

What I suspect is there is a loose jumper stopcock or non return valve before the boiler. This is allowing pressure to build too high as there is no expansion available.

A pressure reducing valve above the main stopcock (to maintain balanced pressures), and on the boiler inlet, fit a single check valve followed by the mini expansion vessel.

Thankyou, will tell him.

And yes they were all warrantee repairs, But they have stated they will not repair it again unless he takes these steps.

Thankyou all, Sorry for the delay in replying I was away the weekend.