Finish Thompson DB22 Series Assembly, Installation And Operation Manual page 8

Centrifugal pump
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2. You must select an explosion-proof FTI motor or provide your own explosion-proof motor.
WARNING: Hot surfaces. This pump is capable of handling liquids with temperatures as high as 220º F (104º C). This may
cause the outer areas of the pump to become hot as well and could cause burns.
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 disassem
bly and inspection of the pump. There may be small quantities of chemicals present during inspection.
WARNING: The pump and associated components are heavy. Failure to properly support the pump during lifting and
movement could result in serious injury or damage to the pump and components.
WARNING: Never run pump at less than minimum flow or with the discharge valve closed. This could lead to pump
failure.
Installation/Operation Precautions
CAUTION: This pump should never be operated without liquid in the casing. It is recommended that run dry protection
be used. Optional electronic power monitors are available to help protect against run dry. If the pump has a PTFE,
ceramic or silicon carbide bushing, IT CANNOT BE RUN DRY WITHOUT CAUSING DAMAGE TO THE PUMP. However,
the pump can operate without liquid in the casing if the pump has a carbon bushing. The exact length of time the pump
can operate dry with a carbon bushing varies with operating conditions and the environment.
CAUTION: Never start or operate with a closed suction valve. Never operate with a closed discharge valve.
CAUTION: Always provide adequate NPSHa (net positive suction head available). It is recommended to provide at least
2 feet (61 cm) above the NPSHr (net positive suction head required).
CAUTION: If pump is used on variable speed drive, do not exceed the frequency for which the pump was designed (for
example, if the pump is a 50 Hz model, do not exceed 50 Hz).
ADDITIONAL SAFETY PRECAUTIONS FOR ATEX COMPLIANT PUMPS
Protection Control
A power monitor, flow switch, pressure switch or similar device must be used to protect against dry running, closed discharge valve or
decoupling. Any of these conditions could lead to a rise in surface temperature of the pump.
Construction Materials
Pump must be manufactured from PVDF with a PVDF motor adapter and bronze bump ring and have the designation "-A" in the pump part
number. The PVDF contains conductive carbon which allows it to be grounded when installed in a properly grounded piping system or when
a properly installed grounding strap is attached to a housing bolt. The bronze bump ring is pressed into the clamp ring or motor adapter and
prevents sparking should the motor bearings fail and the outer drive magnet runs out of round.
Grounding
Static sparking can cause an explosion. When operating in a hazardous area or pumping a hazardous fluid the entire pump system must
be grounded to prevent static discharge. Before operating the pump, ensure the electrical continuity throughout the pumping system
and earth ground is 1 Ohm or less. If greater than 1 Ohm, re-check all grounding connections.
Static Hazard
Static sparking can cause an explosion. Excessive fluid flow rates and improper tank filling methods can produce static electricity causing an
explosion. Ensure safe fluid velocities and tank filling procedures in compliance with CLC/TR 60079-32-1.
Elastomer Selection
Proper o-ring material must be chosen for the fluid being pumped. Improper material selection could lead to swelling and be a possible
source of leaks. This is the responsibility of the end user.
Leaks
The pump must be checked for leaks on a regular basis. If leaks are noticed, the pump must be repaired or replaced immediately.
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