Fristam Pumps FP Series, Instruction And Maintenance Manual, Page: 22 / 32

Fristam FP/FPX Series Pump
22
Figure 3
• Avoid throttling valves
in the suction piping.
• Keep suction lines as
short and direct as
possible.
• Ensure that the NPSH
available in the
system is greater
than NPSH
required by the
pump.
• Avoid sump areas
where sediments
may collect (
Fig-
ure 3 ).
• Avoid the formation of air pockets in the pip-
ing ( Figure 4 ).
• Avoid abrupt closure of shut-off valves, this
may cause hydraulic shock which can cause
severe damage to the pump and system.
• Avoid elbows in the suction line if possible.
When necessary they should be located 5
pipe diameters away from the pump inlet,
and have a bend radius greater than 2 pipe
diameters (
Figure 5
).
• Check valves in discharge line should be a
minimum of 5 ft. away from the pump outlet (
Figure 5
).
E
LECTRICAL
I
NSTALLATION
We use standard duty TEFC motors unless otherwise specified. Many motor options are available: wash-
down, flameproof, explosion proof, hostile duty or chemical duty.
The motor selected should meet the requirements of the specified operating conditions. A change in
conditions (for example, higher viscosity, higher specific gravity, lower head losses) can overload the
motor. When changing operating conditions or whenever there is any doubt, please contact Fristam
Pumps, Inc., for technical assistance.
Have an electrician connect the motor using sound electrical practices. Provide adequate protection.
Pumps fitted with mechanical seals must not run dry, not even momentarily.
Determine the direction
of rotation by watching the motor fan, which must turn clockwise.
Figure 4
1265000110
5/2/03
R 2D
5D
=>
5' MINIMUM
CHECK
VALVE
Figure 5