Doc. No.: OMS500000104
Rev: A Page 11 of 42
Subject to contractual terms and conditions to the contrary, this document and all the information contained herein are the confidential and exclusive
property of FMC Technologies, and may not be reproduced, disclosed, or made public in any manner prior to express written authorization by FMC.
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.
3. Insure that all piping is supported independently of the pump to reduce vibrations and
strain on the pump itself. 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 hose connections between the pump and any rigid piping or the use of
pulsation dampeners.
4. A properly adjusted pressure relief valve or rupture disc must be installed directly
downstream of the pump to prevent damage or injuries resulting from over pressure or
deadhead conditions. The relief valve by-pass line must be as large as the pipe outlet of
the relief valve. Never install valves in the by-pass line or between the pump and relief
valve. FMC recommends that the by-pass be returned to the suction tank or drain, not
back into the pump suction line.
4.5
Multiple Pump Systems
Special consideration must be taken to avoid vibration and pulsation problems when operating
multiple reciprocating pumps using common suction and discharge piping headers. It is
recommended that the user contact FMC or other experienced industry consultants for
assistance with the design of the system and pump in these situations.