Grain Systems PNEG-526 - Manual (Page 180)

8. Check the regulator "set-point" and "lock-up" pressure.
point is the outlet pressure the regulator is adjusted to deliver.
Lock-up is the pressure where tight shutoff is achieved).
IMPORTANT: During start-up, a pressure gauge must be
connected to the outlet piping between the regulator outlet and
the downstream shutoff valve to closely monitor the outlet
pressure. When checking the regulator for set-point and lock-up,
provision must be made to PERMIT FREE FLOW of gas beyond
the outlet valve.
The regulator set-point is factory adjusted as specified on the
order. Set-point should be checked with small gas flow (10% of
maximum regulator capacity or less). Open the valve down-
stream of the regulator before turning on gas. Slowly open the
inlet valve while monitoring the outlet pressure gauge. Small flow
should be set by adjusting the outlet valve.
WARNING: Always closely monitor the outlet pressure gauge
during start-up while opening or closing valves and making
adjustments. If the outlet pressure continues to increase above
the specified lock-up pressure, open the downstream valve to
discharge the excess pressure and close the inlet valve.
Only adjust set-point when gas is flowing through the regulator.
DO NOT adjust if regulator is locked-up (tight shutoff).
IMPORTANT: Small flow during set-point adjustment is particu-
larly important where set-point is in the top third of the spring
range. Large flow could result in over-stressing the spring or loss
of lock-up from the spring compressing solid. If the set-point
adjustment must be made at large flow (60% to 100% of maxi-
mum regulator capacity) and set-point is in upper third of spring
range, use the next higher range spring.
After set-point has been determined to be correct, check for lock-
up by slowly closing the outlet valve. Again closely monitor the
regulator outlet pressure gauge. Regulator must be fully capable
of tight lock-up. If outlet pressure continues to rise above the
lock-up pressure, open the downstream valve to discharge
excess pressure and close the inlet shutoff valve. If the pressure
goes above lock-up the regulator is not closing properly. Make
the necessary corrections before resuming start-up.
9. Prompt attention is essential if there is regulator trouble, if
gas leaks from the vent or elsewhere from the regulator, or if
leaks develop in the piping. Failure to shut down the regulator
may cause serious hazards.
10. The outlet of the vent piping must allow for the free and
unobstructed passage of air and gas.
The diaphragm case vent must be positioned to protect against
flooding, drain water, ice formation, traffic, tampering, etc. The
vent must be protected against nest building animals, bees,
insects, etc. to prevent vent blockage and minimize the chances
for foreign material from collecting in the vent side of the
regulator diaphragm.
is the user's responsibility to assure that all regulator
vents vent lines exhaust to a non-hazardous location
away from any potential sources of ignition. Where vent
lines are used, it is the user's responsibility to assure that
each regulator is individually vented and that common vent
lines are not used.
MONITOR REGULATORS AND
EXTERNAL CONTROL LINES
When bypassing a regulator with an external control line, the
control line valve must be closed before the bypass valve is
opened. Failure to do so could result in the diaphragm being
exposed to the inlet pressure.
USE OTHER GASES
1. Do not use Equimeter regulators on corrosive gases unless
authorized by Equimeter for a specific corrosive condition.
2. Where the gas is propane or butane (LPG) and the
regulator has an internal relief valve special care is
required with the regulator vent. Because propane and butane
are heavier than air, they do not disperse readily in the atmo-
sphere. Instead, they tend to collect in low places. Since large
volumes can discharge from the regulator vent at times of
emergency, care must be taken to pipe any such discharge to
atmosphere at a safe place to prevent any gathering or migration
of explosive mixtures in low areas.
GENERAL INSPECTION AND
SERVICE INSTRUCTIONS
1. lnspect the regulator periodically to make sure it is in satis-
factory working condition. Establish the frequency of inspection
on the basis of severity of service and applicable laws and
regulations. As a minimum recommendation, pressure regulating
and limiting equipment should be inspected at intervals not
exceeding 15 months, but at least once each calendar year.
2. If the regulator is to be moved to another location, make
sure its construction is compatible with the new pressure and
flow conditions.
Before any disassembly of the regulator, make sure
it is completely depressurized. Pressure must be fully released
from the inlet, the outlet and any control line connections. Failure
to adequately depressurize could result in serious injury.
3. Carefully note the location and position of all disassembled
parts to be certain reassembly is correct. lnspect each part
carefully and replace any that are worn, damaged or otherwise
unsatisfactory.
4. Adjustment screw lubrication should be checked whenever
the regulator is serviced. Make sure the threads are fully coated
with lubricant. Where there is evidence of thread wear, such as
loose fit or excessive sideplay, the worn parts must be replaced.
Failure from worn threads can result in serious
personal injury. Even at 10 psig outlet pressure, the force
exerted on the adjustment screw by spring compression can
be great. Therefore, adjustment screw lubrication and thread
condition must be given careful attention.
5. Upon completion of servicing, make certain that the regu-
lator installation is entirely free of leaks.
Equimeter Incorporated
805 Liberty Boulevard
Pennsylvania 15801
(8 14) 37 1-8000
1998 EQUIMETER. INC.
TOC