Page 83 - Webster Service Manual

SPM Single and Duplex Manual Models
SPM Single and Duplex Manual units are capable of
supplying fuel oil to heating units or tanks located up to
feet above the supply pumps. They are designed
for use in maintained pressure or open loop systems.
Pump pressures can be set at a range from 10 psi to
psi. See Correct Supply Line Size charts, for maxi-
mum discharge head.
Tank to Pump Connections
Connect suction line from the tank to preferred supply
pump inlet port. Connect return line from pump return
port to tank. Internal 1/8" bypass plug (factory installed)
must be in position for recommended two-pipe opera-
Be certain all plugs and connections are secure
and leak tight.
The correct suction line size can be determined by
referring to the charts. Generally, the return line should
be sized the same as the suction line. Check valves in
the suction lines between the tank and SPM units
assure that pumps are full of oil, ready for service.
Check valves must be oil tight. Low pressure drop
swing type are recommended to minimize friction loss.
For SPM Duplex Manual models, preferred installation
calls for a separate suction line from tank to pump for
each pump/motor unit. If system failure occurs because
of a gross leak in the suction line of the primary unit, the
second unit can still provide backup service. Check
valves can be installed in return lines to allow removal
of inactive pump for servicing, while primary pump con-
tinues to run.
These typical installation diagrams, illustrating a main-
tained pressure supply system or optional open loop
system, for continuous pump operation, are shown for
reference only. Compliance to all applicable codes
where installed is the sole responsibility of the installer .