Finish Thompson DB22 SERIES - Manual (Page 5)

5
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 disassembly and inspection of the pump.
There may be small quantities of chemicals present during inspection.
WARNING:
Never run pump at less than minimum flow or with the discharge valve closed. This could lead to pump failure.
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.
CAUTION: This pump should never be started without liquid in the casing. If the pump has a PTFE, ceramic or silicon carbide
bushing, IT CANNOT BE RUN DRY WITHOUT CAUSING DAMAGE TO THE PUMP. It is recommended that run dry protection be used.
Optional electronic power monitors are available to help protect against run dry. However, the pump can operate without liquid in
the housing 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 environment.
CAUTION: Never start or operate with a closed suction valve.
WARNING: Operation without priming or against a closed discharge valve can result in high temperatures that can result in
injury or damage to pump components.
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 exam-
ple, if the pump is a 50 Hz model, do not exceed 50 Hz).
Safety Precautions for ATEX Pumps
CAUTION: 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.
WARNING: The pump must be checked for leaks on a regular basis. If leaks are noticed, the pump must be repaired or replaced
immediately.
WARNING: The pump must be cleaned on a regular basis to avoid dust buildup greater than 5 mm.
WARNING: ATEX pumps must use a power monitor, flow switch, pressure switch or similar device to help protect against run-
ning dry, closed discharge valve and decoupling. Any of these conditions could lead to a rise in surface temperature of the pump.
Temperature Classification
The surface temperature of DB Series pumps depends upon the temperature of the fluid that is being pumped. The following chart
lists different fluid temperatures and the corresponding pump surface temperature.
Fluid Temperature Maximum Surface
Temperature
Temperature
Class
Maximum Allowable
Surface Temperature
85º F (36º C) 136º F (58º C) T6 85º C
170º F (77º C) 178º F (81º C) T5 100º C
220º F (104º C) 203º F (95º C) T4 135º