I need to connect two pieces of iron pipe (ouside diameter 27mm, 1 and 1/16 inch) with something flexible, about 2 metres apart, to carry hot water. Lots of PVC piping available, but I can't find anything to mate the iron to the PVC. Any suggestions, please?
flexible pipe will need to be MDPE as that is what the other end of the adaptor expects but it may be possible that a universal-unversal version exists?
That is 3/4" nominal bore, so you are looking for 3/4" fittings. Iron and steel pipes are not measured by the OD. Nor are rigid PVC pipes, if the size is given in inches.
If the iron (or steel unless it is very old) pipe has threads on the ends, the easiest way would be to look for 3/4" BSP female threaded adaptors to your choice of flexible pipe. Alternatively, there are Primofit compression fittings for connecting steel pipes to HDPE.
Ah, if it's CH and not potable, then iron is used but you have to use inhibitors to stop corrosion. Use PEX, JG Speedfit or similar barrier pipe, designed for CH. Don't use MDPE.
Re joints, I'd expect Speedfit do a grip ring fitting, but I'd look further along the pipes for a screwed joint I could undo with a two stilsons to use a threaded adaptor.
It's possible to hire an electric pipe threading tool that exerts no torque on the existing pipe sytem. (There is an anchor that grips the pipe.) If you don't thread it,there is a strong possibility of leaks depending on the state of the outside of the pipe. (pitting/corrosion etc) with compression fittings.
However if it's that bad, you need to consider replacing all.of it.
The cowboy option is to get some thick walled plastic pipe with an internal diameter matching the external diameter of the iron pipe, and then secure it with jubilee clips. Some of the large bore clear plastic pipe I have seen is very (vey) thick walled although I doubt it is approved for CH use.
I phoned 6 local plumbing centres yesterday, each passing me on to the next, until I got the Universal Transition Fittings at the local Drain Centre. However, I'm disturbed to be told by another poster that I shouldn't use MDPE for CH as, although I only needed 2 metres, I had to buy the minimum qty of 25m. And it isn't anywhere near as flexible as I'd hoped.
Plumb Center, Drain Center, etc.. They're tossers, just looking to charge = you the maximum possible, they don't care that you'll never go back. They d= on't want you back, they cater for trade accounts and negotiated discounts.= If Screwfix don't stock it, try BES.co.uk.
Car radiator hoses are mostly permeable to oxygen, which is partly why yo= u should change most anti-freeze every few years. There's no reason why you= couldn't use copper, if you keep the inhibitors up, but it's not a pukka f= ix.
I've never run hot water through any PE, I suspect it will become too flop= py to be useable.=20
problems. Galvanized was used. You probably know that.
Is it feasible to remove more of the pipe, by tracing each piece back to a threaded joint. If you could then unscrew both pipes, you could replace the whole length with plastic - using threaded joints at each end.
you the maximum possible, they don't care that you'll never go back. They don't want you back, they cater for trade accounts and negotiated discounts. If Screwfix don't stock it, try BES.co.uk.
should change most anti-freeze every few years. There's no reason why you couldn't use copper, if you keep the inhibitors up, but it's not a pukka fix.
to be useable.
I think the problem is not so much floppiness as *creep*, i.e. it will gradually stretch under the pressure and gravity loading until it fails. Is it a horizontal run? If so it will survive longer with frequent supports.
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