"ROANIN" wrote in message
...
What is the recommended method for testing 3/8 copper oil feed lines for
an oil furnace for leaks? Pressure or vacuum? Is there a life expectancy
for copper that is buried in the ground or possibly in concrete? These
lines run under the concrete basement floor, so before I replace them I
want to test them. They are about 50 years old and have been working as
far as I know.

Thanks

R


These days you run it above ground. Over many years, some copper lines have
pin-holed. This is true of oil lines and baseboard heating lines. I'd use
pressure to test it, but there may be other methods.