During hydrostatic testing, up to which pressure may leaking joints be tapped to assist in seating the handhole plate?

In hydrostatic testing, if a handhole plate is leaking, it can be tapped to assist in seating it properly. The correct pressure range for this action is up to 300 psig. Tapping the leaking joints helps to reseat the handhole plate and can help stop or mitigate leaks, ensuring a more effective seal during the testing process.

Going beyond this pressure could risk damaging the system or creating safety hazards, as the materials or components may not be designed to withstand excessive stress beyond 300 psig for this purpose. Therefore, maintaining the tapping procedure within this specified limit not only aids in the successful seating of the plate but also aligns with safety procedures in hydrostatic testing.