Pressure and leak test of refrigerant piping system.

After election of provision refrigeration plant onboard and finished refrigerant pipe work prior to

application of insulation, pressure/leak test to be performed as follow procedure.

1.	Close suction valve and discharge valve of compressor.
2.	Open other valves installed on the refrigerant pipe line.
3.	Low pressure switch to be isolated from suction line during this test and ensure that
	expansion valves, pressure switches and etc. containing bellows or diagrams are
	isolated from the rest of the plant during the test.
4.	Charge N2 gas into entire system through charge valve until the pressure rises up to
	the test pressure of 11kg/cm² G. for low pressure side.
	( from expansion valve to compressor suction stop valve)
5.	Close stop valve just ahead the expansion valve on the liquid line to separate high
	pressure line from low pressure line.
6.	Further charge dry N2 gas until the pressure rises up to the test pressure of 21kg/cm² G.
	for high pressure side.
	(From compressor discharge stop valve to manual stop valve installed just ahead
	expansion valve)
7.	Keep this condition for 12 hours and check the pressure drop at the end of this test.
	The pressure drop should not exceed 0.35kg/cm² with following temp. correction.
		P = Po - P (To/T) 0.35kg/cm²
	here,	P = Pressure drop (kg/cm²)
		Po = Initial pressure (kg/cm²)
		To = Initial temperature (°K)
		T = Temperature at end of test (°K)
8.	In case of pressure drop exceeds 0.35kg/cm², every joint to be checked by halide
	torch detector or soap water. If leakage is detected, the test should be repeated
	after the leak part repaired.