Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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Pressure testing
After installation, the unit must be pressure tested and pumped down.
Pressure testing of refrigeration plant
Before charging refrigerant to the plant, it must be pressure tested and pumped down.
Pressure test the plant with one of the following:
•
dry
air; pressurised cylinders containing dry atmospheric air, but
never
oxygen cylinders
•
air compressor for high pressure
•
nitrogen
See also subsection
15.4 Evacuation and charging of refrigerant.
Danger!
The plant compressors must
not
be used to pressurise the plant.
Warning!
Water and other fluids must
not
be used for pressure testing.
Danger!
If using nitrogen, it is important to place a reducing valve with a pressure gauge between the ni-
trogen cylinder and the plant.
During pressure testing, it is important to make sure that pressure transducers and other control
equipment are not exposed to the test pressure. The compressor stop valves must also be closed
during pressure testing.
Plant safety valves must normally be blanked off during pressure testing as their opening pres-
sure is lower than the test pressure.
Danger!
During pressure testing, no persons are allowed in rooms with plant parts or in the vicinity of the
plant.
•
The entire plant must be pressure tested according to local pressure testing rules.
•
The test pressure must
never
exceed the pressure the unit was designed for.
•
If required that the compressor is pressure tested with the unit, the test pressure must
not
exceed
28 bar
.
•
As an initial tightness test, reduce pressure to
10 bar
for a period of
24 hours
. A tightly
sealed plant will maintain this pressure throughout that period.
•
Please make sure that manometers, pressure controls, pressure transducers and other
control equipment are
not
exposed to the test pressure.
During leak testing it is permitted to enter the rooms and approach the plant.
•
As a second tightness test, examine all welds, flange joints, etc. for leaks by applying
soapy water while maintaining the
10 bar
pressure.
When pressure testing, make a pressure test report containing the following:
•
date of pressure testing
•
name of person performing the test
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