Doc No: OMM50002312
Rev: C Page 13 of 54
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property of FMC Technologies, and may not be reproduced
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4.4 Discharge Piping Recommendations
Table 1: Allowable Working Pressure for Steel Pipe (psi @ 100°F)
1. Route the discharge piping in the shortest, most direct route possible. Use the
same pipe size as the outlet of the pump. In installations where the discharge
piping is in excess of 50 feet (15 meters) it is suggested to use the next larger
size pipe to minimize friction losses downstream.
Always use pipe or hose that is designed for your particular pressure
requirements. Inadequate pressure ratings can allow hose or pipe to fail,
resulting in equipment damage and possibly personal injury. Normal
hose pressure ratings are clearly marked on the outer surface of the
hose. Working pressure ratings for steel pipe can be obtained from the
manufacturer or from the chart shown in Table 1.
2. Always use a pressure gage in the pump discharge line. A properly
functioning gage mounted at the pump (and before any valves) is required to
accurately determine the operating pressure of a pump and to conduct
troubleshooting.
3. Ensure that all piping is supported independently of the pump to reduce vibrations
and strain on the pump. Pulsation dampeners on the discharge are recommended
to reduce pressure pulsation and resulting vibration. The use of elbows, nipples,
unions, or other fittings should be kept to an absolute minimum. Avoid short
radius 90 elbows; use two long radius 45 elbows instead. To help isolate
mechanical and hydraulic vibrations, FMC recommends the use of flexible pipe
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