Installation; Tighten Fasteners Before Setup; Tips To Reduce Cavitation - Graco Husky 1050 Operation

Installation

Installation
The Typical Installation shown in F
for selecting and installing system components. Contact
your Graco distributor for assistance in planning a
system to suit your needs.

Tighten Fasteners Before Setup

Before using the pump for the first time, check and
retorque all external fasteners. Follow Torque
Instructions, page 18.

Tips to Reduce Cavitation

Cavitation in a 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: Be sure the inlet fluid pressure does not exceed
25% of the 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.
8
. 4 is only a guide
IG
Graco recommends taking all of the above factors into
account in system design. To maintain pump efficiency,
supply only enough power to the pump to achieve the
required flow.
Graco distributors can supply site specific suggestions
to improve pump performance and reduce operating
costs.
312877ZAD