Finish Thompson UC (S/N 125040 and lower) - Manual (Page 11)

11
CAUTION: Do not run the pump dry. This could damage the pump. The fluid being transferred by the pump lubri-
cates the pump. Even short periods of running the pump dry could damage the pump. It is recommended that a
run dry protection device be used.
CAUTION: Do not dead head the pump. Running the pump at zero flow will cause any liquid inside the pump to
elevate rapidly in temperature. This will continue until the boiling point of the liquid is reached. The liquids will flash
to vapor, causing the pump to run dry, and destroy the pump. Run dry protection in the form of a power monitor is
recommended.
WARNING: All ATEX compliant pumps must use a power monitor to protect against running dry, closed discharge
valve, and pump decoupling. Any of these conditions could lead to elevated surface temperatures.
CAUTION: Cavitation for an extended period of time can cause pitting and damage on the pump components.
Make certain NPSHa is greater than pump NPSHr.
CAUTION: Water hammer. Rapid changes in the fluid’s velocity can cause large, sudden pressure surges. These
pressure surges can damage the pump, plumbing and instrumentation. Common causes are rapidly closing
valves. Check valves on the suction can also cause water hammer if the liquid has time to reverse direction before
the valve closes.
Shutdown
Use the following procedures to shut the pump down.
1. Slowly close the discharge valve
2. Shut off the motor.
3. Close the suction valve.
Disassembly/Reassembly
Disassembly
Pump End
WARNING: Rotating Parts. This pump has components that rotate while in operation. Follow local safety
standards for locking out the motor from the power supply during maintenance or service.
WARNING: Chemical Hazard. This pump is used for transferring many types of potentially dangerous chemicals.
Always wear protective clothing, eye protection and follow standard safety procedures when handling corrosive or
personally harmful materials. Proper procedures should be followed for draining and decontaminating the pump
before disassembly and inspection of the pump. There may be small quantities of chemicals present during
inspection.
WARNING: The pump must be thoroughly flushed of any hazardous materials and all internal pressure
relieved prior to opening the pump.
WARNING: Magnetic force hazard. This pump should only be disassembled and assembled using the recom-
mended procedures. The magnetic attraction is powerful enough to rapidly pull the motor end and the wet end
together. ALWAYS use the jackscrews (item 14) to assemble/disassemble the pump. Do not place fingers between
the mating surfaces of the motor and wet ends to avoid injuries. Keep the drive magnet and impeller assembly
away from metal chips or particles.