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 11§¸/§˛ 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 21§¸/§˛ 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 0.35§¸/§˛ with following temp. correction. |
|
|
P = Po - P (To/T) 0.35§¸/§˛ |
|
here, |
P = Pressure drop (§¸/§˛) |
|
|
Po = Initial pressure (§¸/§˛) |
|
|
To = Initial temperature (ĄŁK) |
|
|
T = Temperature at end of test (ĄŁK) |
8. |
In case of pressure drop exceeds 0.35 §¸/§˛, 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. |
|
|