v simple q: will a compression joint handle mains pressure?

Not sure exactly what you're wanting to do, but if you're simply asking whether plastic (or brass) compression fittings will take mains water pressure, then the answer is yes, in both cases.

David

thanks :)

I assume that you're talking about cutting off the flow once the pipe has been severed. Clearly, a compression joint won't actually cut the pipe - you need a pipe cutter. I assume further that you have some means of temporarily turning off the water while you do this - otherwise you'll have a flood!

Any main-stream pipe fitting will hold against mains pressure - solder, compression, plastic push-fit, copper push-fit. My preference would be the last of these - something like

You will have to turn the water off before you fit it, or use a freezer kit while you do.

Dave

thanks for all the replies. Yes, I do have a pipe cutter, and a bucket :) just in case.

Thanks for all replies, I was mainly concerned as to whether compression joints (or their plastic equivalents) would handle mains pressure vs tank pressure (which I have experience of).

Whatever, thanks for all replies. I'll do it tomorrow.

Best wishes all. :)

oh- and I forgot to mention.... I have a tap to turn off the mains.... which I will be doing obviously... thanks again :)

Please explain exactly what you want to do.

Cutting pipes under mains water pressure is ***spectacular***. IMO not to be done in an attic. =20 Been there done that in the *underdrawing* and survived. =20

--=20 Dave Fawthrop

I have a mix of plastic push-fit type and compression jointing on my mains sode of things - out incoming pressure is about 8.5bar and so-far so good...

Fortunately[1] the flow-rate is very low so if we do get a leak it won't be a torrent...

Gordon

If it's a metal fitting on a metal pipe, then yes, easily.

No idea.

under high pressure and imbed themselves into the opposite wall and then a full open end of water. Get a normal compression cap.

Well, if you will insist on cutting the pipe with a hacksaw, what do you expect?!

Push-fit are *fine* if used properly.

You have limited to no experinece of these, which means you are botty talking as usual. Nothing worse than a know-it-all who knows sweet eff all. Avoid push fit stop ends on high pressure mains pipes. Normal compression is simple and a sound joint.

With that set of stats, if you've got room, consider fitting an accumulator. You'll probably also need a pressure reducing valve if you don't have one already.

With an accumulator, you'll get lashings of mains pressure water with no pump or digging.

Even when you get the blockage fixed in the future, the accumulator will give you a bit of water during mains failure...

Christian.

Out of interest, assuming the pire doesn't give way first, which can withstand the most pressure?

sponix

I don't know - but the copper push-fit fitting which I suggested is rated at

ISRT compression fittings, but it's a long time since I had anything to do with high-pressure stuff.We didn't use solder, anyway.

Brazed then solder.

I've not dealt with accumulators to date but I would expect them to have a restricted max working pressure ( 3 -6 bar?). Anyway they would certinaly be a bit to lot cheaper than digging the garden up.

Err, what _is_ an accumulator? It's not something I've heard of before in the context of /water/, and I'm imagining something like a giant expansion vessel, a sort of sealed-system equivalent of a cold water storage cistern...