Date of imperial/metric changeover

[Handyman]

What date, approximately, was half inch and three-quarter inch copper pipe phased out, in favour of 15mm & 22mm pipe?

 

[cozzmic]

Early to mid seventies. Why?

 

[seanfhear]

Try BS 2871 where '71 is the operative number. This should put you in the right direction. i.e.1971.

 

[Handyman]

Early to mid seventies. Why?

Because where I live, there are various small developments, ranging from 1870s to the present day. It would be useful to know in advance what size pipes I might encounter, and be better prepared to get the job sorted. So, up to 1970, it's imperial, and, say, from 1976 onwards it will be metric. Is that a reasonable assumption?

 

[doitall]

Very reasonable since it happened in 1972.

 

[seanfhear]

Thank you "doitall", you have perhaps closed the approximation asked for, still further.

 

[sime10]

Just get a few 3/4 x 22mm convertors, 15mm and 1/2" are nearer enough the same so no need for convertors