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PUMPS BE OPERATED WITH A FLOODED SUCTION, AS THIS WILL FACILITATE START-UP AND
INCREASE THE SERVICE LIFE OF THE PUMP.
2.0.3 It is recommended that all solution tanks be furnished with a low level cut off switch or low-level alarm
and cut off switch to prevent the pump from running dry. Although the pump can run dry for a few
minutes, OPERATION AGAINST A DRY SYSTEM UNDER THE PRESSURE FOR A PROLONGED
PERIOD MAY CAUSE DAMAGE TO THE PUMP DIAPHRAGM AND REDUCE THE OPERATING LIFE
OF THE PUMP.
3.0
DISCHARGE PIPING
3.0.1 It is recommended that the Mechanically Actuated Diaphragm metering pump operate against a suitable
back pressure to facilitate better operation of the check valves.
3.0.3 To protect the pump, it is recommended that an external relief valve as manufactured by Neptune Chemical
Pump Company, or equal, be placed in the discharge line of the pump to avoid over pressure.
3.0.4 Discharge piping should at least equal to discharge port size of the pump's Liquid Head.
NOTE: All pipes and valves must have a working pressure at least twice the system maximum pressure.
CAUTION :
Do not attempt to run the pump in excess of its nameplate rating.
4.0
INSTALLATION OUTDOORS
The Mechanically Actuated Diaphragm metering pump is a totally enclosed pump, which can be used outdoors or
indoors. When installed outdoors, make sure that the pump is protected against extremes of nature as follows:
4.0.1
Running of the pump when exposed to tropical sunshine with ambient temperature above 100°F (37.8°C)
would cause excessive oil and motor temperatures. The pump should be shaded and located in such a
way as to permit an ample degree of air circulation.
4.0.2
Under cold conditions, the pump should be insulated and a heat tracing should be supplied in order to
maintain the hydraulic fluid at an ambient temperature above 36°F (2°C.)
5.0 START UP PROCEDURE
The following start up procedure is complete and does repeat instructions on filling the gearbox and pump.
5.0.1
Open suction and discharge valves. (See recommendation 1.0.5)
5.0.2
Adjust backpressure close to zero.
5.0.3 Start pump.
5.0.4
On initial start-ups: Check for proper motor rotation (Refer to Paragraph 1.0.6). Listen for any abnormal
motor or crank noises, and if present, refer to trouble shooting chart (page 20)
5.0.5
Adjust system pressure to requirement.
6.0
MAINTENANCE
Under normal conditions, the Mechanically Actuated Diaphragm metering pumps should not require any
SECTION III
NORMAL MAINTENANCE
10
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