Pump Solutions Group Neptune Series 7000 dia-PUMP MODELS 7100 thru 7200 User Manual
Page 11
11
6.3.0
LIQUID HEAD REMOVAL, INSPECTION, AND REINSTALLATION
CAUTION
If the diaphragm has failed, any process fluid would pass through the bleed hole located
behind the diaphragm. Handle any liquid with appropriate care.
Mechanical diaphragms should operate for approximately 2000 hours under normal operating
conditions; however, the accumulation of foreign material or debris and abnormal operating condition
or simply age can cause failure. Failure can also occur as a result of system over pressure. Periodic
diaphragm inspection and replacement are recommended.
6.3.1
Adjust the stroke setting to “0” percent and disconnect the power source to the drive
motor
6.3.2
Relieve all pressure from the piping system.
6.3.3
Take all precautions described under “Caution” to prevent environmental and personnel
exposure to hazardous materials.
6.3.4
Disconnect piping to the reagent head and drain any process liquid.
6.3.5
Place a pan underneath the pump head adaptor to catch any liquid leakage.
6.3.6
Remove all but two top reagent head bolt. Product will leak out between the pump head
adaptor and reagent head as the bolts are loosened.
6.3.7
Tilt the head and pour out any liquids retained by the check valves into a suitable
container, continuing to follow safety precautions as appropriate.
6.3.8
Remove the final bolt and rinse or clean the reagent head with an appropriate material.
6.3.9
Inspect the diaphragm and remove the diaphragm if necessary, by turning counter-
clockwise. The diaphragm must be replaced if it is cracked, separated, or obviously
damaged.
6.3.10 To install a diaphragm, first ensure that the critical sealing areas of diaphragm, reagent
head, and pump head are clean and free of debris. Then lubricate the elastomer side of
the diaphragm liberally, where it is in contact against the intermediate chamber wall and
backup plate, with a lubricant (silicone grease is preferred).
6.3.11
Thread the diaphragm (clockwise) fully onto the shaft.
6.3.12
Install the reagent head bolts and tighten in an alternating pattern to ensure an even
pressure on all bolts.