Here is one for you English guys.

Here in the US we use refrigeration copper pipe and tubing that is measured on the out side dimension OD. While the plumbers and hydronic heat installers use copper pipe that is measured by the inside dimension.

EG. 1 1/8 in. OD refrigeration pipe is equal to 1 in ID water line copper.
1 3/8 OD is equal to 1 1/4 ID.


So this is a 2 part question.

First. Does your refrigeration industry use the OD/ID dimensions as we do here in the States?

Secondly, Our common size pipe is 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1-1/8 etc. If you convert 1-1/8 pipe to metric it comes out to 28.57mm. I'm sure they wouldn't use such a clumsy number for pipe. So what are the common mm sizes?


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