Waukesha 200 series Operation And Maintenance Manual - Installation
Installation
Waukesha Cherry-Burrell
Page 10
95-03074
January 2003
Installation
Special Requirements for Liquid Ring Self-Priming Pump
Liquid ring self-priming pumps are designed for applications with large amounts of entrained air. CIP return pump
applications involve intermittent flow from tank with air entering supply line. Suction lift applications evacuate air from
supply line lifting liquid into pump to begin pumping. Suction lift up to 23 feet (7 meters) is possible.
For pump to work correctly, casing first must be full of liquid. If casing is completely dry or has too little liquid, it will not
be able to self-prime and operate as intended. Correct installation piping helps ensure casing remains full of liquid and
ensures trouble-free operation. Installation piping may include:
•
Vertical Discharge Piping: Ensures backflow into
casing for CIP return or similar applications. Install
vertical section of pipe no less than 3 feet (1 meter)
long in discharge piping (Figure 3).
•
Foot or Check Valve in Suction Piping: For suction
lift applications not allowing vertical suction piping
(Figure 4), install foot or check valve to prevent
backflow and siphon effect from evacuating liquid in
casing.
•
Vertical Suction Piping: For suction lift
applications, install vertical section of pipe no less
than 3 feet (1 meter) long in suction and discharge
piping. This will prevent backflow (due to siphon
effect) from evacuating liquid in casing (Figure 4).
•
Leak-Free Suction Piping: Air leaks in suction
piping will reduce pump performance and may allow
air in faster than pump is able to pump it away. This is
especially important for suction lift applications
requiring long suction lift.
General Requirements
CAUTION: Pump and piping may contain sharp
edges. Wear gloves during installation and service
of pump to help avoid injuries from these hazards.
•
Install pump near as practical to liquid supply.
•
Install shutoff valves to isolate pump from supply and
discharge lines allowing pump service without
draining system.
•
Keep supply piping short and straight to keep pump
supplied with liquid and prevent damaging cavitation.
•
Use line size, particularly for inlet supply line, equal
to or larger than connection size on pump.
•
Ensure joints in suction line are well sealed
preventing air leaks.
•
Support supply and discharge piping near pump
preventing strain on pump casing.
•
Install pipe anchor between joint and pump if
expansion joint is used.
•
Allow easy access to pump for service and inspection
during operation.
•
Ensure mounting structures are properly sized
supporting weight of pump.
•
Consider local noise level regulations.
•
Ensure pump motor type is suitable for environment
where pump is to be operated.
•
Protect motor from flooding.
CAUTION: Pumps intended for use in hazardous
environments - eg., explosive, corrosive, etc. - must
use a motor with appropriate enclosure
characteristics. Failure to use an appropriate motor
type may result in serious damage and/or injury.
Figure 3 - Vertical Discharge
Figure 4 - Vertical Suction and Discharge