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Installer: This instruction booklet MUST be left
with the owner of the service station at
which the equipment is being installed.
Station Owner: Retain these instructions for future use
and provide them to persons servicing
or removing this equipment.
STP-MLD+ Introduction
STP-MLD+ units are piston-operated mechanical leak
detectors intended for installation only in a petroleum
pumping system operating with 20 to 50 PSI pump pressure
with less than 12 feet of static uid head. They automatically
indicate pipeline faults, which leak 3 GPH (gallons per hour)
or more at 10 PSI. These leaks are indicated by restricting
system delivery to 3 GPM (gallons per minute) or less at
pump pressure of up to 30 PSI in compliance with U.S.
EPA requirements 280.41(b) & 280.44(a) for automatic leak
detection in pressurized piping. After installation, the user
of the leak detector must monitor system delivery levels to
ensure that any restricted delivery of fuel, signaling a leak in
the pipeline, is dealt with promptly.
The STP-MLD+ units test the delivery pipeline system up
to the solenoid valve in the dispenser for leaks whenever
the static system pressure has fallen to three PSI or less,
and within 3 to 4 seconds allows full ow if the system has
no leaks. A leak smaller than the required 3 GPH detection
level, any air or vapor trapped in the system, or systems
with pressure below 26 PSI, will lengthen the time before
the leak detector allows full ow. The leak detector is not
designed to detect leaks from the underground storage
tank or the submersible pump.
STP-MLD+ units are designed for use with FE Petro
®
STP/
IST model submersible pumps. STP-MLD+ units can also be
used in competitive submersible models equipped with a 2"
NPT leak detector port or special leak detector tee housing
.
The piston chamber of the leak detector must be vented to
the tank. If your submersible pump does not have a “tank”
port, the pump will have to be replaced, a threaded riser
must be used, or a different leak detector must be used.
All mechanical leak detectors must be tested upon startup,
and routinely thereafter (at least annually) under NFPA
National Fire Prevention Association) standards. These
NFPA and other industry testing practices must be followed
by the installer and the end user.
A leak detector is not a substitute for compliance with prudent
industry practices. Fuel inventory reconciliation checks must
be performed on a daily basis by comparing dispenser meter
totalizers with fuel volume changes in the underground tank.
Installation Instructions
Installation of two or more STP-MLD+’s
in parallel into the same product piping
system will result in the smallest leak
that is detectable being greater than the
EPA requirements. Each STP-MLD+ will
detect a leak of 3 GPH or greater. If two
STP-MLD+s are in parallel, a leak of 6
GPH will be the smallest leak that will
be capable of being detected. If three
STP-MLD+s are in parallel, a leak of 9
GPH will be the smallest leak that is
capable of being detected, and so on.
Note: Third party tests have approved the use of the
STP-MLD+G, STP-MLD+AG, STP-MLD+D, and
STP-MLD+BD for:
• Maximum of 165.1 gallons for rigid pipelines
• Maximum of 109.8 gallons for exible pipelines
• Maximum of 274.9 for a combination of rigid and
exible pipelines (rigid portion cannot exceed
165.1 gallons
Note: A precision line test must be conducted before
installing a leak detector for the rst time. A
precision line test is also recommended before
replacing a leak detector that is having slow ow
(tripping) problems to assure line integrity.
Note: Before installing the leak detector, purge the system
of any air by running the pump and delivering
gasoline from each dispenser (starting with the
dispenser farthest from the pump), until all air is
removed. The leak detector will not work properly
until all of the air is out of the system.
Caution
MLD+ Model List
Model Product Description
MLD+G Gasoline up to 10% Ethanol (blue cover) – For use with a variety of motor fuels including: gasoline, diesel
fuels, kerosene, and gasoline-alcohol blends with concentrations of 0% - 10%
ethanol, 20% MTBE with 80% gasoline, or 17% TAME with 83% gasoline.
MLD+AG Up to 85% Ethanol, 20% ETBE,
17%TAME and gasoline
(blue cover with SS vent tube) – For use with a wide variety of motor fuels
including: gasoline, diesel fuels, kerosene, gasoline-alcohol blends with
concentrations of 0% - 85% ethanol, 20% MTBE with 80% gasoline, or 17%
TAME with 83% gasoline.
MLD+D Diesel fuel and kerosene only
(gold cover) For use with diesel fuels and kerosene. DO NOT use in any other
motor fuel as it will NOT detect leak rates that comply with U.S. EPA requirements.
MLD+BD Up to 20% Biodiesel and 100%
Biodiesel
(
gold cover with
SS vent tube)
For use with diesel fuels, up to 20% biodiesel
and diesel blends, 100% biodiesel, and kerosene. DO NOT use in any other motor
fuels as it will NOT detect leak rates that comply with U.S. EPA requirements
.
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