Plumbing help - pipe sizes!!

cubegame

I've managed to cut us off from the cold water supply as I was in the process of replacing a worn stopcock with an isolating valve and pressure reducing valve.

I thought that both sides of the tap were 15mm pipe and had picked up both fittings with 15 mm compression joints. However, after cutting the tap out and clearing up the pipe ends the incoming pipe is just slightly wider than 15mm.

I realise that this is probably some imperial sizing but could anyone offer advice on what size it is likely to be based on it being just slightly wider than 15mm?



Cheers

woodbutcher_2

Is the incoming pipe Lead?

cubegame

woodbutcher wrote: »

Is the incoming pipe Lead?

No, it's copper. Slightly thicker walled than the 15mm pipe on the house side.

Inactive

15mm is probably half inch?

22mm is about three quarter inch I believe.?

woodbutcher_2

Old copper pipe was made of thicker stuff than what you get now but the external circumference will be the same.I suspect,as you say,it is imperial,though not exactly sure as plumbing is not my thing.Maybe go to a plumbing merchant and explain the problem.I'm sure they will have an imperial to metric fitting.

Alternatively,you could try lightly sanding with emery or similar to try and reduce the size very slightly 'til new fitting goes on.I suspect there will not be a lot of difference between the two.

I had to join copper to lead once and the merchants gave me a fitting called a lead lock and told me i may have to trim the lead slightly to get it to fit.This turned out to be the case and after a bit of judicious trimming,i got it to work.

Inactive

You need a 15mm to half inch coupler, it would seem.;)

woodbutcher_2

I'm not so sure myself.Was old copper pipe 1/2"? Seems a big discrepancy between that and 15mm.About 1/8" and i'm sure he said fitting was too small which would make old stuff bigger than 15mm.

As i say,not a plumber so maybe best talk to a plumbers merchant.

cubegame

Having looked around at the difference between the two sizes (15mm and half inch) it would seem that the half inch to 15mm coupler is the answer. Fingers crossed!

Thanks all.

Inactive

Good luck, I'm sure that will do the job.;)

plumb1_2

cubegame wrote: »

Having looked around at the difference between the two sizes (15mm and half inch) it would seem that the half inch to 15mm coupler is the answer.

Thanks all.

There is no such fitting, you will have to file the 1/2" pipe down, to accept the 15mm.

wildheart_2

plumb1 wrote: »

There is no such fitting, you will have to file the 1/2" pipe down, to accept the 15mm.

you are talking rubbish im afraid.a metric to imperial adapter is indeed available.i should know as i sell them and they are a standard fitting.