Where should pipe joint compound be applied on threaded connections?

When it comes to applying pipe joint compound on threaded connections, the correct practice is to apply it on the male threads completely. This is important for several reasons.

Firstly, the purpose of a pipe joint compound is to seal the connection and prevent leaks. Applying the compound only on the male threads ensures that the seal is created as the male threads are screwed into the female threads. Compounds reduce friction, making it easier to screw the pipes together while also providing a barrier against leaking gas or fluids.

Furthermore, if the female threads were to be coated instead, it could lead to excess material being squeezed out when tightening the joint, which might contaminate the connection or interfere with the integrity of the seal. Additionally, applying joint compound to both the male and female threads could create a messy joint and risk improper sealing.

In summary, applying pipe joint compound to the male threads completely ensures a proper seal without the risks associated with applying it to the female threads or leaving the joint dry.