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R600 and HSRL Series LP-Gas Regulators
7
The inlet and outlet pressure plug may be removed using
a 7/16 in. / 11 mm hexagon wrench. The pressure tap is
restricted, so the plug can be removed with pressure on the
outlet of the regulator. Install a pressure gauge to determine
the regulator’s inlet pressure and outlet setting during
adjustment, (actual pressure at the second stage regulator
may be less due to line loss). After setting, add thread sealant
to the 1/8 in. NPT pipe plugs. Reinstall the pipe plugs by
threading into the gauge ports finger-tight and then wrench
tighten 1-1/2 to 3 turns past finger-tight (approximate maximum
torque of 12 ft-lb / 16 N•m). Replace the closing cap. Check
the pipe plugs for leakage.
Overpressure Protection
!
WARNING
Some type of overpressure protection is
needed if actual inlet pressure can exceed
the outlet pressure rating. Overpressuring
any portion of this equipment above the
limits shown in the Specifications section
may cause damage to regulator parts, leaks
in the regulator or personal injury due to
bursting of pressure-containing parts or
explosion of accumulated gas.
If any portion of the regulator is exposed to
an overpressure condition that exceeds the
limits in the Specifications section, it must be
inspected for damage that may have occurred.
Large volumes of gas may discharge through
the regulator vent during internal relief valve
operation, which can, if not controlled, result
in fire or explosion from accumulated gas.
The R600 and HSRL Series regulators, except for the
first stage of the Types R632A and R632E, contain internal
relief valves. The internal relief valve in all units will
give overpressure protection against excessive build-up
resulting from seat leakage due to worn parts or chips or
foreign material on the orifice. The amount of internal relief
protection provided varies with the regulator type and the
cause for the overpressure relief valve operation. When the
internal relief valve opens, gas escapes to the atmosphere
through the regulator’s vent.
Some type of additional external overpressure protection
must be provided if the outlet pressure in an overpressure
condition exceeds the inlet pressure rating of the gas system
or downstream equipment. Common methods of external
overpressure protection include relief valves, monitoring
regulators, shutoff devices and series regulation.
Maintenance
!
WARNING
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without first isolating the
regulator from system pressure and relieving
all internal pressure.
Regulators that have been disassembled for
repair must be tested for proper operation
before being returned to service. Only parts
manufactured by Fisher
®
should be used for
repairing Fisher regulators. Relight pilot lights
according to normal startup procedures.
Due to normal wear or damage that
may occur from external sources, these
regulators must be inspected and maintained
periodically. The frequency of inspection
and replacement of the regulators depends
upon the severity of service conditions or
the requirements of local, state and federal
regulations. Even under ideal conditions,
these regulators should be replaced after
20 years from date of manufacture or sooner
should inspection reveal the need.
Failure to replace a regulator that has had water
inside due to flooding, water table level or
weather events or has corrosion present could
result in personal injury or property damage.
Visually inspect the regulator each time a gas delivery is
made for:
• Improper installation, vent not pointed vertically down or
under a cover; no vent tube on underground systems
• Plugged or frozen vent
• Wrong regulator or no regulator in the system
• Internal or external corrosion, including paint chipping
or flaking
• Flooded Regulator; water in spring case; regulator
submersed on underground tanks
• Regulator age
• Any other condition that could cause the uncontrolled
escape of gas
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