Pump pressure tightness test assembly, broadside pipeline and installation method of broadside pipeline

The invention discloses a pump pressure tightness test assembly, a broadside pipeline and an installation method of the broadside pipeline, and relates to the field of ship installation engineering. Apipe valve assembly comprises a broadside pipe and a broadside valve, the pump pressure tightness test assembly comprises a tightness test sealing plate and a tightness test flange, the tightness test sealing plate is connected to the side end face of the broadside pipe in a sealed mode, a first connecting hole is formed in the center of the tightness test sealing plate, and a first threaded connecting pipe is arranged at the first connecting hole; the tightness test flange is detachably connected to the inlet end of the broadside valve, a second connecting hole is formed in the center of thetightness test flange, and a second threaded connecting pipe is arranged at the second connecting hole; when a pump pressure tightness test is carried out, the broadside valve is closed, a pump pressure hose is connected into