All UK copper pipe is sized by external dimension in mm irrespective of wall thickness. So that is completely opposite to UK stainless pipe which is sized by internal diameter!! Crazy and inconsistent, but that is how it is.
I am sure I can cut a copper strip from sheet in the correct size to make up any difference in diameter. Possibly add a table of suitable shim dimensions in with each order?
All UK copper pipe is sized by external dimension in mm irrespective of wall thickness. So that is completely opposite to UK stainless pipe which is sized by internal diameter!! Crazy and inconsistent, but that is how it is.
Sounds like you just described the difference between how a pipe and a tube are measured.
This is useful stuff, but please split these last few comments off into a new post.
Thanks thunder88, I had thought that the different schedule pipes had the same internal diameter but they are actually slightly different. 2" schedule 40 is slightly bigger than 2" schedule 80. But both are sized by internal diameter wheras the tube is sized by external diameter which remains constant for the different wall thickness's.
Thanks LOO, I will compile those dimensions into excel for my own use later.
This may not be the right thread to ask but does any one know off hand if the dash series deplegmator / condensor 3/8" npt fittings will marry up well enough with 3/8" bsp? Or is this a no no.
Small sizes are close but the advice is not to use them where pressure holding capacity is important. For some applications you can get away with it, but the threads are likely to cut into one another. This damages the threads but if they are not going to be moved around from 1 fitting to another - it is not a big deal.
Comments
All UK copper pipe is sized by external dimension in mm irrespective of wall thickness. So that is completely opposite to UK stainless pipe which is sized by internal diameter!! Crazy and inconsistent, but that is how it is.
I am sure I can cut a copper strip from sheet in the correct size to make up any difference in diameter. Possibly add a table of suitable shim dimensions in with each order?
Sounds like you just described the difference between how a pipe and a tube are measured.
@thunder88, possibly, is this consistent everywhere? I don't know the dimensions or standards for USA and Aus pipe and tube.
Australian, New Zealand, European and American standards
https://www.youtube.com/watch?v=ty6eY9VUIgI
@Myles, As far as I know, pipe dimension is always the ID and tube dimension is always the OD.
Difference between Pipes and Tubes
This is useful stuff, but please split these last few comments off into a new post.
Thanks thunder88, I had thought that the different schedule pipes had the same internal diameter but they are actually slightly different. 2" schedule 40 is slightly bigger than 2" schedule 80. But both are sized by internal diameter wheras the tube is sized by external diameter which remains constant for the different wall thickness's.
Thanks LOO, I will compile those dimensions into excel for my own use later.
https://www.youtube.com/watch?v=ty6eY9VUIgI
In Austarilia our pipe is measured as Nominal Bore, so neither ID or OD really.
StillDragon Australia & New Zealand - Your StillDragon® Distributor for Australia & New Zealand
copper pipe excel attached
https://www.youtube.com/watch?v=ty6eY9VUIgI
Hi Fellas
This may not be the right thread to ask but does any one know off hand if the dash series deplegmator / condensor 3/8" npt fittings will marry up well enough with 3/8" bsp? Or is this a no no.
Cheers
Anything 1/2" or smaller is near enough when the npt/bsp threads are together from what i've been told. I'll go and try one for you.
Edit, sorry i have no 3/8th fittings in BSP who'da thought it. You should be good though.
StillDragon Australia & New Zealand - Your StillDragon® Distributor for Australia & New Zealand
I have some RTD PT100 sensors with 1/2"npt thread, they fit 1/2"bsp OK
OD
Awesome thanks. Will report back if I have issues.
1/2" fits, 3/4" not quite so good
Small sizes are close but the advice is not to use them where pressure holding capacity is important. For some applications you can get away with it, but the threads are likely to cut into one another. This damages the threads but if they are not going to be moved around from 1 fitting to another - it is not a big deal.
Pipe Thread NPT and BSPT fittings compatibility (PDF)