FE PETRO STP150B++ - Manual Pressure Relief

10
Manual Pressure Relief
The manual line pressure relief (see Figure 14) is located
in the center of the stationary manifold under a brass
cap. It is available on all pumps manufactured after April
of 1996. FE Petro makes it easy to relieve the pressure
in the piping system anytime routine maintenance or
troubleshooting must be performed.
Simply remove the brass cap at the top of the stationary
manifold, and turn the pressure relief screw counter-
clockwise until you come to the screw’s retaining ring
(approximately 4 complete turns). This allows the pressure
in the piping system to bleed back to the storage tank.
Next, turn the screw clockwise to its original position
to close the path (turn snug, do not over tighten); then
replace the brass cap. Line side pressure is now relieved
and maintenance or troubleshooting can be performed
without having to contain excess product that escapes
when the system is pressurized.
Clamp Valve (Check Valve Clamp)
The clamp valve (see Figure 14) is located directly
above the check valve inside the stationary manifold of
the submerged pump. It consists of a lead screw with a
sealing disk attached. The head of the screw is accessible
by removing the 1 / 4" line test port pipe plug on the check
valve cover of the STP / IST.
The cavity under the 1 / 4" pipe plug is
at full pump pressure and product will
be released through this opening. If
the pump is equipped with a manual
pressure relief, use it to relieve line
pressure prior to removing the plug.
For normal operation, the clamp valve should be rotated
fully counter-clockwise where a star washer locks it in
place. Be sure to replace the 1 / 4" pipe plug. During a
line test, the clamp valve should be rotated fully clockwise,
where the sealing disk secures against the check valve.
This blocks the pressure relief valve in the check valve so
it does not relieve line pressure back to the tank.
Syphon Systems (Optional)
Syphoned tanks should be of the
same diameter with tank bottoms
located on the same horizontal plane.
Using tanks of different diameter, or
installing the bottoms of the tanks on
different horizontal planes may create
a potential site for fuel to leak into the
environment and / or the containment
sump due to overll of the tank(s).
Some jurisdictions allow two or more tanks of the same
product grade to be manifolded together with a syphon
loop. These systems usually have a single submersible
pump, and the syphoning action keeps the tanks
level while pumping out of only one tank. All FE Petro
submersible pumps have syphoning capability built into
the pump. However, if a syphon check valve is required,
it must be ordered separately. The outlet of the syphon
check valve should be connected with a line to the highest
spot in the syphon loop. At this point the submersible pump
creates a vacuum of 20–28" Hg.
When correctly installed, the syphon action between the
tanks will continue whether the pump is running or not, as
long as the product level in the tanks is higher than the
bottom of the syphon loop vertical piping. The function of
the STP / IST in the syphon system is merely to prime the
syphon line, removing the air and allowing the syphon to
take place.
Note: The syphon port on FE Petro submersible pumps
was designed to be connected to the syphon piping
between tanks. Using the vacuum port (syphon
port) for other purposes may create complications
with the pump’s ability to draw a vacuum because
of excessive foreign materials being drawn into
pump components.
Note: A fuel lter, between the syphon check valve and
the syphon loop, may be useful to help eliminate
debris from entering the syphon check valve.
Debris can keep a syphon check valve from
operating properly. Be sure to use a fuel lter,
which is compatible with the application.
Warning
Warning