Shutdown; Routine Maintenance - Johnson Pump Top Wing Series Manual

• Check that the valves are completely open on both the inlet and outlet and that the
pipelines are free from obstructions. The TopWing pumps are of the positive dis-
placement type and should therefore never be operated against a closed valve, as
this would result in pressure overload, damages on the pump and possibly damage
on the pump system.
• Check that the drive shaft has the correct direction of rotation for required flow, see
figure below.
• Before starting the pump, make sure that there is liquid on the suction side.
This is very important for pumps with unflushed product seals as these sealing arr-
angements must never run dry.
• Before operating the pump it is considered good practice to briefly start and stop the
pump to check the direction of rotation and to make sure that there are no
obstructions what so ever for the function. When this has been done the operation
can begin. Keep a visual check on the suction and discharge pressure gauges and
monitor the pump temperature and absorbed power where possible.
2.5

Shutdown

When shutting the pump down the valves on the suction and discharge side must be
closed. Following precautions must be taken:
• The power is shut off and the starting device locked so that the pump cannot be
started.
• The pneumatic relief valve is purged.
• The connections for the flushed mechanical seals are shut off and depressurised.
• The pump and pipelines must be empty and de-pressurised.
See chapter "4.0 Disassembly and assembly instructions'' before undertaking any work
on the pump.
2.6

Routine maintenance

• Check the oil level regularly.
• Change the oil once a year or every 3000 operating hours, whichever comes first.
• For lubricant capacities and grades, see "Section 3.2''.
• Measure vibration and temperature, these factors can indicate bearing failure.
16
Rotation
Suction
Rotation
Discharge
Direction of rotation
Suction
A.0500.301/314.A – IM-TW/10.00 GB (0401)