What is the change in length of a 2.00 m copper pipe if its temperature is raised from 20°C to 972°C? any help would be loved.
L2final length ?? L1initial length 2 m T2final temp 972 C T1initial length 20 C a coef linear expansion of copper 17E - 6 L2 L1 * [ 1 + (a) * (T2 - T1)] L2 2 * [ 1 + (17E - 6) * (972 - 20)] L2 2.032368 m
I've never heard of any entity government, local or federal that recommended replacing OLD metal piping with new copper pipes. To a great extent, the longevity of any pipes, other than plastic, like the new PEX stuff, is quite dependent on the quality or lack thereof, of the water in your particular area. I live in a house built in 1904, and most of it is still using good old galvanized pipe to supply water all over the place. We have plenty of pressure and flow out of both the old and the newer pipes which have been installed in the last 10-15 years. In the 40 years I've been working with plumbing, I've only seen two galvanized pipes that had rusted through to the point where there was actually a hole that leaked water. I have, however, seen a hundred copper pipes, most of them in walls, that have corroded small little pin prick holes in them and then sprayed all over the inside of the wall pocket between studs. That makes a mess of drywall and basement ceilings if they're finished. If you're seriously considering replacement of your pipes, I would very much recommend the new PEX materials. It's flexible enough to be installed very easily in places where pipes previously dared not go. I believe it's also less expensive than copper, by a bunch.
thermal expansion of Cu is 16.5 ?m·m?1·K?1 temp swing is 952C so 952 x 16.5 E-6 15.7E-3 or 15.7mm edit forgot the 2 meters, so 31mm is the answer.
