ITW Dynatec DYNAMELT D15 Series, Technical Documentation Manual

Page: 222 / 234

Page 4 ITW Dynatec
Rev.10.15 Appendix Pumps
Operation
WARNING
•
Follow all General Safety Instructions.
•
Measures must be taken to avoid skin contact. Wear protective clothing.
•
Downstream pressure can change rapidly once the pump is started. If the
downstream flow passages are blocked or valves are closed, the pump will likely
reach dead-head condition before valves can be opened or the blockage removed.
Dead-head condition occurs when the pump reaches maximum pressure
achievable at a given speed, with a given fluid viscosity.
Reaching the dead-head condition may cause the pump to fail, or for piping limits to
be exposed. Dead head occurs whenever the pump is operating but the applicators
are not dispensing.
•
Measure the pump temperature after installation, and monitor temperature during
operation. Rapid changes in temperature, while process temperatures and ambient
temperatures are stable, signals a pending failure.
Safety Notes on Start-Up
•
Check to insure that all process safety devices are in place and operational.
•
Be certain the pump is fully lubricated and full of fluid prior to starting the motor.
•
Be certain the pump temperature has fully reached the process temperature prior to
starting the motor. Heat soak the pump sufficiently to ensure all recesses are at
process temperature.
•
Pump outlet pressure and speed limits are dependant on fluid viscosity and
throughput. Pump inlet pressure is an important feature for lubrication and fluid
stability. Materials for pump construction are important for corrosion and wear
resistance. Consult ITW Dynatec for detailed applications. Normally the pumps are
single or dual output. Typical speed ranges are 10-90 rev/ min.
•
To avoid contamination of process fluid, the pump should be flushed out to remove
test oil. Precaution must also be taken to flush out pumps at plant shutdown, since
congealed fluid can cause seizure, when operating PUR.
•
Unless fluid purity can be guaranteed (especially from metal fragments), filtration must
be installed before pump inlet, to avoid damage to pump internals.
•
During start-up, start the motor with a low speed set point, then gradually increase
speed to the intended operating speed. An acceleration rate of 20 rpm / sec or less is
recommended; 5 rpm / sec is a good starting point, allowing ample acceleration time
for downstream apparatus to fill gradually with fluid, and for pressure to rise slowly.
•
If at any time during operation the pump does not appear to be running smoothly, or
unusual noise is heard, stop the pump immediately to limit internal damage and
contact ITW Dynatec!