Installation; General Information; Tighten Clamps Before First Use; Tips To Reduce Cavitation - Graco SaniForce 2150 Operation Manual

Installation

Installation Installation
Installation of this 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

General Information

General Information Information
The Typical Installation shown is only a guide for
selecting and installing system components. Contact
your Graco distributor for assistance in planning a
system to suit your needs. Always use Genuine
Graco 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 Tighten Tighten Clamps Clamps Before Clamps
After you unpack the pump, and before you use it
for the first time, check all clamps and tighten as
necessary.
3A5132K
Before First Before First Use First Use Use
Tips to to to Reduce Tips Tips Reduce Reduce Cavitation Cavitation 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 of the
pumped liquid, the system suction pressure, and the
velocity pressure. It can be reduced by changing any
of these factors.
1. Reduce vapor pressure: Decrease the
temperature of the pumped liquid.
2. Increase suction pressure:
a. Lower the installed position of the 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 of the suction piping.
NOTE: NOTE: If the fluid inlet pressure to the pump is NOTE:
more than 25% of the outlet working pressure,
the ball check valves will not close fast enough,
resulting in inefficient pump operation. Excessive
inlet fluid pressure also will shorten diaphragm
life. Approximately 3-5 psi (0.02-0.03 MPA,
0.21-0.34 bar) should be adequate for most
materials.
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.
Graco recommends taking all the above factors
into account in system design. To maintain pump
efficiency, operate the pump at the lowest speed and
pressure setting needed to achieve the required flow.
Graco distributors can supply site specific
suggestions to improve pump performance and
reduce operating costs.
Installation
9