How many flanges are there in a pair of flanges in pipe installation?
One pair is one pair. Two also can understand, is the same, but here should be matching
Flange is to connect two pipe fittings, in general, to connect two pipes, the two pipes need to be welded at one end of the flange, so one is two pieces
The old tradition is a pair of two. A pair of gloves is two, a pair of sleeves is also two, a pair of flanges is two pieces.
