Boiler PRV blow-off

[AndersonC]

Does the copper pipework which exits the boiler to bleed the PRV have to be connected together with soldered fittings, or are push-fit acceptable for this application?

Any advice appreciated, thank you.

 

[oilman]

Since boilers have push fits inside them, I don't see why push fits can't be used.

 

[chrishutt]

I would say only metal fittings (compression or soldered) since the discharge could be steam at 100°C.

 

[oilman]

So how do we get over the push fits used in boilers?

I actually use metal fittings to the tundish, and since these are plastic pushfits are no problem thereafter.

 

[gigz]

I would have said because the tundish discharge is a bigger diameter the pressure is'nt as much. We always use soldered. Seen one the other day where 15 mm speedfit pipe was pushed into an endfeed elbow

 

[chrishutt]

I actually use metal fittings to the tundish,...

Tundish? We're talking boiler PRVs here, not unvented cylinders, so no tundish.

As for a boiler's internal seals and joints, that's the responsibility of the manufacturer and the notified body (testing house) that issues the CE mark. Beyond the PRV is our responsibility and we're subject to different standards and can't get away with half the stuff manufacturers do inside their boilers.

 

[oilman]

Tundish? We're talking boiler PRVs here, not unvented cylinders, so no tundish.

Oh? Well I've seen them on MIs. I suspect the reason they're not used mostly is it's more expensive than a bit of pipe stuck through a wall (assuming it's even done as well as that). I came across them last week pointing along the side, towards the front of the boiler