Are 15mm PVRs obsolete?
boabbyrab
Posts: 36 Forumite
Had water dripping from the tundish and had a plumber come out and said it was the PVR and had to order it, came back a few days later and said that it was 15mm instead of 22mm pipework leading to the tundish and the pipework would need replaced. Most of the pipework is 22mm just a few is 15mm (from the hot water vessel).
Couldn't get the 15mm PVR as obsolete (seemingly)and he recharged the cold vessel which worked (so far) but is this work that will need doing or is it just to wrangle some cash.
1st owner in 2011 and have the paperwork for the tank and it was supplied with a 15/22mm tundish so don't get how it could be wrong.
Couldn't get the 15mm PVR as obsolete (seemingly)and he recharged the cold vessel which worked (so far) but is this work that will need doing or is it just to wrangle some cash.
1st owner in 2011 and have the paperwork for the tank and it was supplied with a 15/22mm tundish so don't get how it could be wrong.
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Comments
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What's a tundish?0
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If it sticks, force it.
If it breaks, well it wasn't working right anyway.0 -
What make and model of unvented hot water tank is it?
Have you looked online for the part? (Makers usually list their part numbers for the spares in the manuals).
The outlet from the tundish is almost invariably 22mm to the outside world (drain); if any of that is only 15mm then it needs uprating to cope with the potential water flow under fault condition.0 -
It is a Range Tribune HE and it is 15mm from the water tank to the top of the tundish and the bottom part is 22mm to the drainWhat make and model of unvented hot water tank is it?
Have you looked online for the part? (Makers usually list their part numbers for the spares in the manuals).
The outlet from the tundish is almost invariably 22mm to the outside world (drain); if any of that is only 15mm then it needs uprating to cope with the potential water flow under fault condition.0 -
The only time an unvented cylinders pressure relief valve drips is when the expansion vessel or air buddle (which acts as a vessel), depending on its design has gone down or if the pressure reducing valve has failed and you live in a very high-pressure area (unlikely).
Once the pressure reducing valve(s), of which there is two on unvented cylinders, start to pass following the lack of a bubble/air pressure, it/they will usually re-seat when the underlying issue is fixed. However, where it has been occurring for a sustained period, they can get mineral deposits (such as scale) or the seal can fail and they will need replacing.
These are standard fittings, typically the one on the cylinder will be 9-10 bar temperature pressure relief valve, and the one on the combination valve will be a 6 bar pressure relief valve.
The size of the temperature relief valves outlet will either be 15mm or 22mm (can be bigger in commercial applications), this is determined by the size of the cylinder, in most cases, it will be a 15mm outlet to D1 pipework (which is the smaller pipework that goes to the tundish) for domestic cylinders. Check the specifications in the manufacturer's instructions, then order the one you need. Reliance is a commonly used brand of PRV's.
Neil M. MCIPHE RP RHP EngTech0
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