Flowserve FPS 14 - Manual (Page 4)

A Full Port Isolation Valve should be installed on the motive gas supply line to allow the pump
to be isolated for service.
A Union or Flange should be installed between the isolation valve and the pump mechanism to
allow for easy removal of the mechanism for service. This should be installed 14” or more
above the cover flange, or in a horizontal plane outside of the O.D. of the cover flange, for easy
removal.
NOTE: Motive gas pressure should be reduced to the minimum required to both overcome
back pressure and high enough to provide necessary pump capacity.
NOTE: If the motive gas pressure exceeds 200 psig, a pressure-reducing valve (PRV) must be
installed on the motive gas supply line to reduce the pressure to the pump. The PRV should be
installed as far upstream as possible for optimum performance.
A Safety Relief Valve set at or below 200 psig, and a pressure gauge should be installed on the
motive gas supply line to protect the pump should the PRV fail. These items should be installed
downstream of the PRV, and upstream of the pump.
4. RESERVOIR / VENTED RECEIVER TANK: A reservoir or vented receiver tank is always required
ahead of the pump. This is to prevent equipment flooding while the pump is in the discharge
cycle. The actual requirement depends on the application and the type of installation. Please
consult GESTRA if a reservoir or vented receiver is not existing, or has not been specified.
5. VENT LINE: Connect the vent line to the 1” NPT vent connection “V”. This vent line should be
pipe to atmosphere, or back to the equipment to be drained. Application details will determine
how the vent must be piped.
A Tee and Ball Valve should be installed in the vent line for troubleshooting purposes (See
Installation Drawings). This is very important because it will allow troubleshooting of the vent
and pressure valves without removing the mechanism from the tank.
A full port isolation valve should be installed on the vent line to allow the pump to be isolated
for service.
A Union or Flange should be installed between the isolation valve and the pump mechanism to
allow for easy removal of the mechanism for service. This should be installed 14” or more
above the cover flange, or in a horizontal plane outside of the O.D. of the cover flange, for easy
removal.
If the vent line piping needs to be run more than 10 feet, the pipe size should be increased to
greater than 1” in order to prevent restrictions which could reduce the capacity of the pump.
If the vent line is run horizontally, the piping should be pitched so as to be self-draining to
prevent vapor lock.
NOTE: If condensate pressure from the equipment to be drained can exceed pump outlet
pressure under normal operating conditions, a steam trap must be installed after each pump.
This steam trap will prevent steam from blowing though the pump and entering the condensate
return line. Consult GESTRA for the proper steam trap sizing and selection.