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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.
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
• Flooded Regulator; water in spring case; regulator
submersed on underground tanks
• Regulator age
• Any other condition that could cause the
uncontrolled escape of gas
Failure to properly inspect the regulator could result in
personal injury or property damage.
vent Opening
Make sure the regulator vent, vent assembly, or vent
tube does not become plugged by mud, insects, ice,
snow, paint, etc. The vent screen aids in keeping the
vent from becoming plugged, and the screen should
be clean and properly installed.
Regulator Replacement
Older regulators are more likely to catastrophically
fail because of worn or corroded parts. Replace
HSRL Series regulators over 20 years of age. Other
service or environmental conditions may dictate
replacement of the regulator before it becomes
20 years old. Regulators that are installed on
underground systems and in areas that are subject
to sea salt (coastal) atmospheres should be inspected
annually for external and internal corrosion
and may require replacement sooner. Refer to
Fisher
Bulletin LP-32 for additional information.
®
Water inside Regulators from Floods
or Weather
Replace any regulator that has been flooded, has had
water in the spring case or shows evidence of external
or internal corrosion. Checking for internal corrosion
can be done by removing the closing cap and with the
aid of a flashlight observing the condition of the relief
valve spring, main spring, and internal spring barrel
area. A more detailed examination will require shutting
down the gas system and complete removal of the
adjusting screw. Closely examine regulators installed
with their vent horizontal for signs of corrosion.
Correct any improper installations.
Regulator Repair
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 to repair Fisher regulators. Be
sure to give the complete type number of the regulator
when corresponding with the factory.
The type number, orifice size, and spring range are
on a label attached to the spring barrel. The date of
manufacture is stamped on the regulator. Always
provide this information in any correspondence with
your Fisher Distributor regarding replacement parts
or technical assistance. If construction changes are
made in the field, be sure that the regulator marking is
also changed to reflect the most recent construction.
HSRL Series
7
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