On 1/8/2014 9:07 PM, robin wrote:
From: "Robert A. Rosenberg" <[email protected]>
Sent: Thursday, January 09, 2014 2:37 PM
At 10:56 +0000 on 01/08/2014, Mike Kerford-Byrnes wrote about SI
units and such:
A few years ago I attempted to purchase 225 yards of water pipe from a
plumbing merchant, only to be told (in no uncertain terms) that only
metric
lengths were available. Somewhat chastened, I mentally converted and
asked
for 200 metres of water pipe. The response?
"Half inch or three-quarters?"
I see no problem with the question. The pipe is still made in half
and three-quarter diameters (not metric diameters) since it is a
standard item and needs to work with older fittings/etc. The lengths
however have switched over to metric lengths.
Depends where you are and what kind of pipe (copper, iron, etc).
Here, copper pipe diameters are in metric, but only are rough
approximations
to the original imperial diameters.
So, 3/8-inch is 10mm half-inch is 12mm, 5/8-ths is 15mm, 3/4 is 20mm.
Of course, original iron water pipe still goes by imperial diameters.
No no, it's the ironic water pipe he was talking about. :-)
