What's the reason for the diameters of MDPE pipe and why are they
different to copper?

And another one: why is a street elbow called a street elbow?
(The rather low quality article on wikipedia was of no help!
http://en.wikipedia.org/wiki/Street_elbow)

Last question: where is Doctor Evil? :-)

TIA

Mr F.

What's the reason for the diameters of MDPE pipe and why are they
different to copper?

The pipe wall is much thicker. An MDPE pipe of the same diameter as a copper
would have much lower flow. Also, as they aren't compatible with copper
fittings, it is best not to have the same outside diameter, to prevent the
temptation.

20mm MDPE is approximately equivalent to 15mm copper. 25mm MDPE is
approximately equivalent to 22mm copper. 32mm MDPE is approximately
equivalent to 28mm copper.

By "approximately equivalent to" is meant "slightly better than", especially
for the 15mm20mm.

Christian.

In message , Mr Fizzion
writes
What's the reason for the diameters of MDPE pipe and why are they
different to copper?

And another one: why is a street elbow called a street elbow?
(The rather low quality article on wikipedia was of no help!
http://en.wikipedia.org/wiki/Street_elbow)

Last question: where is Doctor Evil? :-)

Back, unfortunately

It would appear that the brain transplant was unsuccessful, and the
jury's still out on as to whether the gender change worked.

--
geoff