GB-H-152 GAS BOOSTER PACKAGE OPERATION AND MAINTENANCE MANUAL
© 2008 DH Instruments, a Fluke Company
Page 18
•
Check that the booster drive adjust regulator (2) is set to a pressure of 0.15 MPa (20 psig) or higher
and that minimum flow requirements are met (see Section 1.4, 2.2).
•
Check there are no restrictions in the shop drive air supply circuit. Remove any restrictions. If a filter
is installed on the shop drive air circuit, it may cause a flow restriction.
•
Check that there are no leaks in the shop drive air circuit. Repair any leaks.
5.4
PRESSURE GENERATES TOO SLOWLY OR NOT AT ALL
A slow running booster will cause the pressure to be generated slowly. Ensure the booster is running
properly before continuing (see Section 5.2).
•
Check that the test gas (high pressure) supply to the
SUPPLY IN
port is not below 4.8 MPa (700 psi).
If the supply is too low, increase supply pressure. Speed of pressure generation is directly related to
the pressure of the test gas supply. For example, pressure is generated twice as quickly with the test
gas supply at 14 MPa (2 000 psi) than with the supply at 7 MPa (1 000 psi).
•
Check that there are no restrictions in the test gas supply line to the booster. If a restriction exists,
remove it. Possible restrictions include a valve not fully opened, a regulator with a low flow constant
(CV), an inline filter, small diameter tubing, etc.
•
Check that the booster inlet and outlet check valves in the high pressure booster piston are
operating properly. Close the booster drive shutoff valve (4). Adjust the high pressure Regulator (6)
to zero pressure by rotating the knob counter-clockwise until no spring force is felt.
•
Open the booster drive shutoff valve (4). The booster should cycle several times then stall. If the
booster does not stall when the test gas supply pressure is above 2 MPa (300 psi) and the shop drive
air pressure is below 0.25 MPa (40 psig), the check valves are the most likely cause. Contact a
DHI
Authorized Service Provider if faulty check valves are suspected.
5.5
BOOSTER RUNS CONTINUOUSLY
The booster is a pneumatically operated pump. The reciprocating action is caused by an imbalance of
forces within the pump due to the opposing drive air pressure and the high pressure instrument gas
supply that is being boosted. If the booster runs continuously, it means that forces do not equalize.
•
Check that the test gas supply is present at the
SUPPLY IN
port (5) and is at least 1/25 of the desired
booster output pressure. Generally, test gas supply needs to be at least 4 MPa (600 psi). If not,
ensure that supply meets required specifications (see Section 2.2).
•
Check that the high pressure circuit connected to the
HIGH PRESSURE OUT
port is not open to
atmosphere.
•
Check that there are no leaks in the high pressure line from the output of the booster at the check
valve to the point-of-use. Repair any leaks. If driver air supply pressure is above 0.25 MPa (40 psig),
adjust to below this limit. If booster stops running, increase test gas supply.
•
Check that the inlet and outlet check valves in the high pressure booster piston are
operating properly. Close the booster drive shutoff valve (4). Adjust the high pressure regulator (6)
to zero pressure by rotating the knob counter-clockwise until no spring force is felt.
•
Open the booster drive shutoff valve (4). The booster should cycle several times then stall. If the
booster does not stall when the test gas supply pressure is above 20 MPa (300 psi) and the drive air
pressure is below 0.25 MPa (40 psig), the check valves are the most likely cause. Contact a
DHI
Authorized Service Provider if faulty check valves are suspected.
