Finish Thompson DB22 SERIES - Manual (Page 9)

9
Section III - Start-up and Operation
Start-up and Operation
1. This pump must be filled from a flooded suction tank (grav-
ity) or primed with liquid from an outside source. The DB22
is not self-priming.
2. Open the inlet (suction) and discharge valves completely
and allow the pump to fill with liquid.
3. Close the discharge valve.
4. Turn the pump on. Slowly open the discharge valve. Adjust
the flow rate and pressure by regulating the discharge
valve. Do not attempt to adjust the flow with the suction
valve.
Shutdown
1. Use the following procedure to shutdown the pump.
2. Slowly close the discharge valve.
3. Turn off the motor.
4. Close the suction valve.
Flush Systems
CAUTION: Some fluids react with water; use compatible
flushing fluid.
1. Turn off the pump.
2. Completely close the suction and discharge valves
3. Connect flushing fluid supply to flush inlet valve.
4. Connect flushing fluid drain to flush drain valve.
5. Open flushing inlet and outlet valves. Flush system until the
pump is clean.
Optional Drain Installation
1. Remove the impeller housing (item 1) from the pump as-
sembly.
2. Clamp the impeller housing to a drill press table.
3. Using a 7/16” drill and the molded boss as a guide, drill
completely through the molded boss into the interior of the
impeller housing.
CAUTION: Do not tap too deep or the impeller housing may
be damaged.
4. Using a ¼” NPT tap, tap the hole in the molded boss to the
appropriate depth.
5. Install the drain plug or valve, being careful not to over-
tighten.
Section IV - Maintenance
Recommended maintenance schedule
The recommended maintenance schedule depends upon the
nature of the fluid being pumped and the specific application.
If the pump is used on a clean fluid, it is recommended that the
pump be removed from service and examined after six months
of operation or after 2,000 hours of operation. If the pump is
used on fluids with solids, high temperatures or other items
that could cause accelerated wear, then this initial examination
should be sooner.
After the initial examination of the internal components and wear
items are measured, a specific maintenance schedule can be
determined. For best results, it is recommended that the pump
be removed from service annually for examination.
Disassembly
WARNING: Rotating Parts. This pump has components that
rotate while in operation. Follow local safety standards for lock-
ing out the motor from the power supply during maintenance or
service.
WARNING: Chemical Hazard. This pump is used for trans-
ferring 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: Magnetic force hazard. This pump should only
be disassembled and assembled using the recommended pro-
cedures. The magnetic attraction is powerful enough to rapidly
pull the motor end and the wet end together. 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.
Stop the pump, lock out the motor starter, close all the valves
that are connected to the pump, and drain/decontaminate the
pump.
WARNING: The pump must be thoroughly flushed of any
hazardous materials and all internal pressure relieved prior to
opening the pump. Allow the pump to reach ambient tempera-
tures prior to performing maintenance.
1. Secure the pump/motor to the bench with the adapter foot
hanging over the edge. Remove (4) 1/2” socket head cap
screws, lock washers and flat washers (items 14, 15, 16)
securing the pump to the motor. Use 3/8” Allen wrench or
3/8” hex socket on universal joint.