Copper pipe 21.68mm?
Discussion
We have a house built in 1960, most of the plumbing is original, the copper pipe seems to be slightly smaller than 22mm, I just measured one bit, its 21.68mm. Is it imperial? it doesn't correspond to an imperial size according to my Zeus book.
In two instance now a plastic push on 22mm end stop has failed and starts dripping.
The first one I put a compression fitting on and wound it up, its been fine.
I'm about to do the second.
I'd ideally like to find the correct fitting? But I suspect I'll end up using 22mm?
Its under the bath in a tricky corner and I have an arm in plaster....they'll be some swearing!
In two instance now a plastic push on 22mm end stop has failed and starts dripping.
The first one I put a compression fitting on and wound it up, its been fine.
I'm about to do the second.
I'd ideally like to find the correct fitting? But I suspect I'll end up using 22mm?
Its under the bath in a tricky corner and I have an arm in plaster....they'll be some swearing!
Huntsman said:
I have just wound a 22mm on, seems to be ok.
But its not 3/4, that would be about 19.2mm, so what size is it?
'Pipe' is measured on the inside, whereas 'tube' is measured on the outside. over the ages people have messed with this fundamental and confused the whole issue. But its not 3/4, that would be about 19.2mm, so what size is it?
We have moved from imperial pipe to metric tube, with all the attendant issues, especially when older buildings are involved.
I gave up trying to work out the logic in Imperial to Metric pipe measurements when I was training and just accepted that 1/2 inch is 15mm, 3/4 is 22mm and inch is 28mm.
But it does sound like the OP has discovered 3/4 inch pipe. A plumbers worst nightmare to discover after you've just cut into it and realise you have no adapters or olives!
But it does sound like the OP has discovered 3/4 inch pipe. A plumbers worst nightmare to discover after you've just cut into it and realise you have no adapters or olives!
King Herald said:
'Pipe' is measured on the inside, whereas 'tube' is measured on the outside. over the ages people have messed with this fundamental and confused the whole issue.
According to Wikipedia (cough), metric copper pipe is measured by OD, ie 15mm, imperial pipe is measured by ID, ie 3/4 inch.1/2inch and 15mm are very nearly the same OD, to the extent that fitting can be used on either size.
3/4inch and 22mm have a bigger size difference, 22mm compression fittings on a 3/4inch pipe will be fine, but in my experience a 22mm push fit on a 3/4 pipe wont be fine.
The pipe sizes shown on the wiki table refer to american specs where the wall thickness, and hence OD is defferent to european.
I'm developing pipe size OCD.....
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