5
Watson McDaniel Company
PMPNT Manual 2605100 Rev A
Installation – Open Loop (Vented) System
1.
The pump must be installed standing in the
vertical position and located below an
atmospheric (vented) receiver. It is
important that the preferred operating
filling head be established from the top of
the pump body to the underside of the
receiver. A minimum of 6” filling head is
recommended.
Note:
Less fill head is
possible, but capacity will be reduced from
published values.
2.
Vented Receiver:
A vented receiver
should be installed before and above the
pressure motive pump. If you will be using
and existing tank or fabricated one, be
sure to verify that the vessel is properly
sized and vented for the application.
Please consult our sizing guide on Page 10
of this instruction.
3.
Connect the inlet and outlet check valves
to the pump.
Caution:
Make sure that the
flow arrows on the check valves are
oriented in the proper direction. For
optimum performance, horizontal pipe runs
immediately before and after the check
valves should be kept as short as possible.
Pipe up the pump inlet check valve to the
receiver and outlet check to the discharge
line. It is recommended that full port
isolation valves be used for the pump,
matching the line size.
4.
Connect the operating steam supply
pressure to the motive inlet connection
(1/2" FNPT) at the top of the pump head.
Motive pressure line should always be
equipped with an isolation valve, strainer
and a steam trap. The motive steam drip
trap condensate discharge may be piped to
the top of the receiver or pump
discharging line. A PRV may also be
considered in the motive piping to adjust
the pressure to optimum level.
5.
Pump Vent/Exhaust Line:
Install a pipe
line from the pump vent connection (1/2"
FNPT) to the top of the receiver. This
piping is extremely important to ensure
proper operation of the pump and system.
Figure 4: Open Loop Pump System