Pressure Motive Pumps

Pressure Motive Pumps

The Watson McDaniel PMP Series of Pressure Motive Pumps are designed to transfer hot condensate (or other liquids) without the use of electrical power.  The mechanical seals in standard electric condensate return pumps begin to have difficulty when handling condensate in excess of 195° F. Seal failure is virtually guaranteed when condensate temperatures reach 203° F due to flashing of the condensate across the seal face. It is therefore required to cool condensate in order to prevent seal failure prior to pumping using electric pumps. PMPs do not have seals and therefore will handle condensate well in excess of these temperatures.

The primary application for the PMP is pumping condensate from a process application or condensate collection area back to the condensate return system.  All PMP Series stand alone units are furnished with pump tank, check valves, and internal pumping mechanism.  The PMPSP Sump Drainer is a special PMP designed for pumping water out of low lying areas or pits. It is an excellent solution where there is no access to electricity.

Watson McDaniel also offers Pumps with Receiver Tanks which consist of one or more stand alone pump units connected to an appropriately sized receiver tank mounted on a common base. Additional pumping units can be used for increased capacity or pump redundancy in case of failure.  SimplexDuplexTriplex and Quadraplex condensate pumping systems are available.

Pump-Trap Combination (PMP with Steam Trap) is used when draining condensate from a single piece of heat transfer equipment whose steam flow is being controlled with a modulating type valve.  When a modulating valve controls the flow of steam to a heat exchanger, a stall condition can develop.  Stall occurs when the modulating valve closes and steam pressure downstream of the valve is unable to push the condensate into the return line and it backs up into the heat exchanger.  A pump-trap combination will eliminate this problem.  Watson McDaniel Pump-Traps are available with either an internal steam trap (Model PMPT) or an external steam trap (WPT Series).

Watson McDaniel’s fully-qualified fabrication facility is ASME Code Certified. Our engineers can design and build complete custom condensate pumping systems to meet all your requirements.


Pressure Motive Pump 1" X 1" (NPT) PMPM LOW-CAPACITY (MINI) PRESSURE MOTIVE PUMP  (0-150 PSI)
-35 %

Pressure Motive Pump 1" X 1" (NPT) PMPM LOW-CAPACITY (MINI) PRESSURE MOTIVE PUMP (0-150 PSI)

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CAD$3,123.25 CAD$4,805.00

Pressure Motive Pump 1 1/4" X 1 1/4" (NPT) PMPM LOW-CAPACITY (MINI) PRESSURE MOTIVE PUMP  (0-150 PSI)
-35 %

Pressure Motive Pump 1 1/4" X 1 1/4" (NPT) PMPM LOW-CAPACITY (MINI) PRESSURE MOTIVE PUMP (0-150 PSI)

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CAD$3,438.50 CAD$5,290.00

Pressure Motive Pump  1" X 1" (NPT) PMPT PUMP & TRAP COMBINATION W/ INT STM TRAP DUCTILE IRN PMP BDY  (0-150 PSI)
-35 %

Pressure Motive Pump 1" X 1" (NPT) PMPT PUMP & TRAP COMBINATION W/ INT STM TRAP DUCTILE IRN PMP BDY (0-150 PSI)

1" X 1" (NPT) PMPT PUMP & TRAP COMBINATION W/ INT STM TRAP DUCTILE IRN PMP BDY  (0-150 PSI) The M..

CAD$4,169.75 CAD$6,415.00

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