4
Required Tools
• Standard at head screw driver, for manual pressure
relief.
• 1¼" socket / ratchet wrench for tightening the STP-
MLD+ into the manifold housing.
• 9/16" and a 1/2" open end wrench or an adjustable
wrench for attaching exible tubing ttings.
• UL - recognized non-hardening, non-toxic pipe thread
sealant.
Preparation
1. Disconnect power to the submersible pump at the
electrical supply box (if already installed).
2. Tag and lock out electrical circuit breakers so they
are not turned on accidentally.
If the electrical circuit breakers
are accidentally turned on while
installing a leak detector, there is the
possibility of ignition of hydrocarbon
vapors, and/or the installer being
bathed in gasoline, which could
result in serious personal injury or
death. ALWAYS tag and lock out
breakers so they are not turned on
accidentally.
Warning
Before commencing the installation
of a leak detector, use safety cones,
barricades, trucks, etc. to isolate the
work area.
Caution
Relieve line pressure by using the
manual pressure relief (if present),
or by loosening a pipe plug either in
the manifold cover of the STP/IST or
in the shear valve under a dispenser.
Make adequate provision to trap
the liquid that escapes to prevent
contamination of the environment.
Re-tighten the pipe plug or manual
pressure relief.
3. Remove the two-inch pipe plug or old leak detector
from the submersible pump or the adapter tee.
4. Examine the straight bore below the two-inch
threads for roughness caused by corrosion. If
rough, smooth with ne emery paper.
5. Apply UL-classied non-hardening, non-toxic pipe
thread sealant to the two-inch threads on the leak
detector, and lubricate the O-ring with grease or
oil. Make sure the manifold cavity and STP-MLD+
threads are dry, clean and free from any debris.
If wet, thread sealant may wash off of the applied
areas and weeping may result.
6. Screw the leak detector into the pump or adapter
tee, and tighten with a 1¼" Socket or pipe wrench
on its body ats. The STP-MLD+ must be properly
torqued into the manifold to provide a good seal
(minimum of 138 foot-pounds) (see Figure 2).
7. Remove the plastic dust cover from the vent port
at the top of the leak detector.
8. Remove the 1/4-inch plug from the TANK PORT
on the pump manifold. Apply UL-classied, non-
hardening, non-toxic pipe thread sealant to the
threads on the tubing tting and install one 90º
tting in the leak detector vent port and a 90º tting
in the tank port.
Take steps to prevent any foreign
materials from getting into the top of
the leak detector as damage to the
sealing surfaces in the piston area
could result, preventing the leak
detector from operating correctly.
The FE Petro
®
STP/IST’s have two
labeled ports: one for the syphon
system and one for the tank. The
leak detector must be vented to
the tank port only. This is the port
closest to the tank. Do not connect
a leak detector to the syphon port,
as this will make the leak detector
inoperative, causing it to be
incapable of detecting a leak, with
resulting risk of contamination of the
environment (see Figure 2).
9. Install the vent tube which is packed with the
STP-MLD+, into the compression ttings just
installed in step 8 above, and tighten rmly. The
tubing may be shortened if needed.
This line vents the air displaced by
piston travel, and drains any liquid,
which may leak past the piston seal.
When installing this tubing, make
sure it is not crimped and that it will
drain properly to the tank, or the
leak detector will not open properly
and could give a false indication
of a leak. Failure to install and
connect this tubing could result in
environmental contamination.
10. Turn power on at the load center and turn on the
submerged pump at a dispenser. Look for leaks
at the parts just worked on. If there are any leaks,
immediately turn off the power at the load center,
tag and lock out the breaker, and repair the leaks.
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