GB-K Gas Booster Package Operation and Maintenance Manual
Page 25
© 1998 - 2000
DH Instruments, Inc
.
•
Check that there are no leaks in the high pressure line from the output of the booster at the outlet
check valve to the point-of-use. Repair any existing leaks.
•
Check that the inlet and outlet check valves in the high pressure booster piston are
operating properly. Close the Shop Drive Air Shut-off Valve (11). Adjust the High Pressure
Outlet Regulator (7) to zero pressure by rotating the knob counter-clockwise until no spring force
is felt.
Open the Shop Drive Air Shut-off Valve (11). The booster should cycle several times then stall.
If the booster does not stall when the instrument gas supply pressure is above 2 MPa (300 psi)
and the shop drive air pressure is below 0.5 MPa (75 psig) for GB-K-75 or 0.25 MPa (40 psig) for
GB-K-152, the check valves are the most likely cause. Contact a
DHI
Authorized Service
Provider if the booster continues to run.
5.5
BOOSTER CONTINUOUSLY RUNS
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 instrument gas supply is present at the Supply Inlet Fitting (3) and that minimum
pressure is 2 MPa (300 psi). If not, ensure that supply meets required specifications.
•
Check that the high pressure circuit 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 shop driver air supply pressure is above 0.5 MPa
(75 psig) for GB-K-152 or 0.25 MPa (40 psig) for GB-K-152, adjust to below this limit. If booster
stops running, increase instrument gas supply.
•
Check that the inlet and outlet check valves in the high pressure booster piston are
operating properly. Close the Shop Drive Air Shut-off Valve (11). Adjust the High Pressure
Outlet Regulator (7) to zero pressure by rotating the knob counter-clockwise until no spring force
is felt.
•
Open the Shop Drive Air Shut-off Valve (11). The booster should cycle several times then stall.
If the booster does not stall when the instrument gas supply pressure is above 2 MPa (300 psi)
and the shop drive air pressure is below 0.5 MPa (75 psig) for GB-K-152 or 0.25 MPa (40 psig)
for GB-K-152, the check valves are the most likely cause. If the booster does not stall, contact a
DHI
Authorized Service Provider.
5.6
CANNOT ACHIEVE PRESSURE (LP & HP)
5.6.1
LOW PRESSURE
Maximum output pressure of the Low Pressure Outlet Regulator (12) is 1.25 MPa (180 psi).
•
Check that instrument gas supply is set above 2 MPa (300 psi).
