Can someone explain to me why thinner walled flexible copper 3/8
tubing (e.g., .025, .032 inch) is (is it?) considered less safe or
appropriate than thicker-walled. I'm talking about a mobile-home
furnace installation. The pump pressures involved are less than,
say, a water line.
The line pressure will be and damn well better be less than a water line. If
the tank is above ground, then the only real pressure on the line will be
that of the weight of the oil on the line, as the pump pulls the oil from
the tank. Either copper will work, but its up to your local jurisdiction as
to the type that you have to use.
The pressures on the line past the pump, however, are normally in excess of
100PSI, and thats not a worry....so long as you donthave to replace your
feeder line off the pump.
Thanks. Very helpful.
I wondered too about the sturdiness of thinner walls in extremely cold
weather of the sort we're having now in New England. Sub-zero.
On Wed, 21 Jan 2004 21:52:21 -0500, "CBhvac"
.032" (or better) is used to reduce possibility of corrosion through or
puncture of or other damage to the line. If buried in a concrete (or other)
floor it should be run through a plastic flex (or ridgid) conduit as some
concretes can be corrosive to copper. The pressure is only that of the head
of the oil in the tank perhaps 0.5-5 psi depending on tank elevation and
amount of oil in it, in fact it can run at slight vacuum when the burner is
running due to pressure drop through the filter.
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