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Technical Tips & Information
Watson McDaniel PMP Series
The Watson McDaniel PMP Series of Pressure Motive Pumps are designed to transfer liquids, normally condensate, without the use of electrical energy. The primary application for the PMP is pumping condensate from a process application or condensate collection area back to the return system. Hot Condensate 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 istherefore 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.
Several choices of pump body materials, types and configurations are available to meet specific customer applications:
Ductile Iron Tanks Ductile Iron is far superior to cast iron in handling higher pressures and temperatures. Ductile iron is also extremely corrosive resistant to condensate and water and can last in excess of 50 years before tank replacement is required. Our ductile iron tanks can be ASME coded on request.
Fabricated Carbon Steel Carbon steel has a higher
pressure and temperature rating than ductile iron. Certain
industrial facilities such as chemical and petrochemical
refineries request carbon steel only. Our carbon steel tanks come standard ASME coded.
Fabricated Stainless Steel Stainless steel (304L) tanks are
the most corrosive resistant and can be used in extremely
harsh environments. Low Profile Low profile tanks are often required when draining condensate from process equipment when positioned close to the ground which limits filling head. Low profile units are available in both fabricated steel and cast iron.
Sump Drainers Sump drainers are similar to the standard
PMP models except that they discharge the condensate
vertically upwards. This piping configuration allows them to
be easily fit into below ground sump pits with limited space.
High Pressure Standard units have a maximum discharge
pressure of 150 PSIG. High pressure (PMPHP) units can
discharge condensate up to 200 PSIG and are used for
returning condensate against systems with high back pressure.
TYPICAL CONFIGURATIONS
Stand-Alone: PMP pump unit with inlet and outlet check valves.
Simplex: One Pumping unit with check valves and receiver tank, mounted on frame and skid base.
Duplex: Two Pumping units with check valves and receiver tank, mounted on frame and skid base..
Triplex: Three Pumping units with check valves and receiver tank, mounted on frame and skid base.
Quadraplex: Four Pumping units with check valves and receiver tank, mounted on frame and skid base.
FEATURES
• Seal-less – The PMP contains no seals. The weak point in conventional electric pumps is seal failure due to flashing hot condensate across the seal face.
• Non-Electric – Since no electricity is required they can be
used in remote locations or NEMA 4,7 & 9 hazardous areas. Can operate using steam, air, nitrogen or other pressurized gases as the motive force.
• Ductile-Iron – Pump tanks are standard in Ductile-Iron
which is far superior to Cast-Iron for pressure and
temperature rating and safety. Can be ASME coded and
can last in excess of fifty years prior to replacement.
• Carbon Steel – Pump tanks available in ASME coded
carbon steel.
• Stainless Steel – Pump tank options include 304L for
applications in harsh environments.
OPTIONS
• Cycle counter for measuring the amount of condensate flow through the pump.
• Insulation jackets are available to stop radiation loses
through the pump body and provide personal protection.
• Sight glass for monitoring liquid level inside pump body.
• ASME code-certified fabrication facility for the design and
manufacture of customized systems.