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5.2 Ideal Metering Pump Installation
Figure 16
All piping systems should include:
o
Shutoff valves and unions (or flanges) on suction and discharge piping. This permits
check valve inspection without draining long runs of piping. Shutoff valves should be
the same size as connecting pipe. Ball valves are preferred since they offer minimum
flow restriction.
o
An inlet strainer, if the product is not a slurry. Pump check valves are susceptible to dirt
and other solid contaminants unless designed for that service, and any accumulation
can cause a malfunction. The strainer should be located between the suction shutoff
valve and the pump suction valve. It must be sized to accommodate the flow rate and
the anticipated level of contamination; 100 mesh screens are recommended.
o
Vacuum/pressure gauges in the suction and discharge lines installed to check system
operation. Gauges should be fitted with protective shutoff valves for isolation while not
in use.
o
A separate system relief valve to protect piping and process equipment, including the
pump, from excess process pressures.
