How many expansion joints should be used in a pipe?

Where do we use expansion joints in piping?

Using expansion joints on piping depends upon the configuration of the piping where you will place the expansion joint to absorb thermal expansion or contraction.

How do you service test an expansion joint?

Expansion joints are maintenance free. They can only be tested if the expansion joint is supplied with 2-ply testable bellows using vacuum or air pressure testing.