Installation
Installation ofthis equipment involves potentially
hazardous procedures. Only trained and qualified
personnel who have read and who understand
the information in this manual should install this
equipment.
• All electrical wiring must be done by a qualified
electrician and comply with all local codes and
regulations
General Information
The Typical Installation shown is only a guide
for selecting and installing system components.
Contact your Verder distributor for assistance in
planning a system to suit your needs. Always use
Genuine Verder Parts and accessories. Be sure all
accessories are adequately sized and pressure rated
to meet the system’s requirements.
Reference letters in the text, for example (A), refer to
the callouts in the figures.
Tighten Clamps Before First Use
After you unpack the pump, and before you use it
for the first time, check all clamps and tighten as
necessary.
Tips to Reduce Cavitation
Cavitation in a double diaphragm pump is the
formation and collapse of bubbles in the pumped
liquid. Frequent or excessive cavitation can cause
serious damage, including pitting and early wear of
fluid chambers, balls, and seats. It may result in
reduced efficiency of the pump. Cavitation damage
and reduced efficiency both result in increased
operating costs.
Cavitation depends on the vapor pressure ofthe
pumped liquid, the system suction pressure, and the
velocity pressure. It can be reduced by changing any
ofthese factors.
1. Reduce vapor pressure: Decrease the
temperature ofthe pumped liquid.
2. Increase suction pressure:
a. Lower the installed position ofthe pump
relative to the liquid level in the supply.
b. Reduce the friction length of the suction
piping. Remember that fittings add friction
length to the piping. Reduce the number of
fittings to reduce the friction length.
c. Increase the size ofthe suction piping.
NOTE: Be sure the inlet fluid pressure does not
exceed 25% ofthe outlet working pressure.
3. Reduce liquid velocity: Slow the cyclic rate of
the pump.
Pumped liquid viscosity is also very important but
normally is controlled by factors that are process
dependent and cannot be changed to reduce
cavitation. Viscous liquids are more difficult to pump
and more prone to cavitation.
Verder recommends taking all the above factors
into account in system design. To maintain pump
efficiency, supply only enough power to the pump to
achieve the required flow.
Verder distributors can supply site specific
suggestions to improve pump performance and
reduce operating costs.
859.0769
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