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GB-152-AF™ OPERATION AND MAINTENANCE MANUAL
5.7
LEAKS
Pressure leaks are the most common problem found in pressure handling equipment. Normally, the first
step is to determine if the leak is within the booster or outside of the unit.
•
To determine if the leak is within the unit, disconnect at the booster high pressure OUT port and
plug it. Establish similar conditions under which the leak was observed and determine if the leak is
still present. For small leaks, it may be necessary to install an appropriate pressure sensing device
at the OUT port. In some cases, it is useful to perform simple leak checks on the most common
outside sources before disconnecting the test system. Note that leaks inside the booster are unusual
unless there has been some disassembly.
•
More than one leak can exist in a system. Fixing one leak does not guarantee a leak tight system.
Therefore, continue executing the troubleshooting procedures until all leaks are located
and corrected.
Since it is impractical to produce a troubleshooting guide that will cover every
conceivable leak, the source of your leak may not be covered in this guide.
•
Check all fittings and components for leaks. Use leak detection fluid for small leaks. Tighten loose
fittings or replace damaged fittings. Repair or replace leaking regulators.
Never tighten a fitting while it is under pressure. If pressure is in the system and the fitting should fail
while being tightened, you or those around you may be injured.
Do not over-torque the DH500 fittings that are inside the booster. To do so will damage them,
requiring their replacement. Recommended torque on a DH500 fitting gland is 15 Nm.
It is possible that a leak exists in the high pressure section of the gas booster. These leaks are very difficult to
isolate and detect. If no leaks can be found following the above procedures, it is likely the problem is within
the booster. Contact a DHI Authorized Service Provider for assistance (Section 6, Table 2).
5.8
GAS CONTINUOUSLY VENTS THROUGH
EXHAUST MUFFLER
When the booster does not run and gas is venting through the muffler, the boosters air cycling valve
(spool valve) is stuck between its toggle points.
There are two methods for restoring proper operation.
order below:
•
Put the drive air SHUTOFF valve in the OFF position. Plug the booster high pressure OUT port.
Increase drive air pressure, using the DRIVE ADJUST regulator, to 65 (450 kPa). Put the drive air
SHUTOFF valve into the ON position quickly. If the booster begins to operate normally, set the drive
air SHUTOFF valve to OFF and reset the regulator to previous settings. Repeat the process until the
booster begins normal operation.
•
Put the drive air SHUTOFF valve in the OFF position. Plug the booster high pressure OUT port.
Increase drive air pressure using the DRIVE ADJUST regulator to 65 (450 kPa). Remove the
exhaust muffler and use your hand to plug the vent port. Put the drive air SHUTOFF valve into the
ON position quickly.
remove it. If the booster begins to operate normally, set the drive air SHUTOFF valve to OFF,
reinstall the muffler and reset regulators to previous settings. Repeat the process until the booster
begins normal operation.
If normal operation cannot be restored, contact a DHI Authorized Service Provider.
© 2007 DH Instruments, a Fluke Company
This is normally caused by a low gas flow rate.
When the build-up of pressure begins to leak past your hand, quickly
Page 22
It is recommended to perform them in the
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