UFC 3-420-01
25 October 2004
two normally open (N.O.) isolating valves, whether the installation has one
pump or multiple pumps. Provide each pump with a check valve on the
discharge and two N.O. isolating valves.
606.5.11.6.2 Continuous Running. Variable speed, constant pressure,
continuous running pumps are to be considered when anticipated
pressure fluctuation would result in short-cycling of the "on-off" type of
pumps. Whether the installation is a single pump or multiple pumps,
provide one full-size pump bypass having a check valve and two N.O.
gate valves. Provide each pump with a check valve on the discharge and
two N.O. isolating valves.
A-18
Previous Page
