PMP & PUMP-TRAP APPLICATIONS
CONDENSATE RECOVERY • Using Pressure Motive Pump (PMP)
PURPOSE:
For recovering condensate from multiple sources when the total system back pressure is greater than the individual source pressures. The receiver tank is used to collect the condensate and properly vent system flash steam.
OPERATION:
Condensate from multiple sources at various pressures collects in a receiver (flash tank) for pressure equalization. This allows drainage by gravity into the Pressure Motive Pump (PMP), filling the PMP until the internal mechanism reaches its upper trip point and activates the motive steam used for pumping. Pressure from the flash steam generated by the hot condensate is vented to the atmosphere in order to equalize tank pressure to 0 psig. This assures that condensate will freely flow by gravity to the receiver tank and then to the pump tank, avoiding potential condensate back-up.
INSTALLATION GUIDELINES:
(see Figure 22)
• The receiver tank and receiver vent connection must be properly sized to accommodate the flash steam and allow for pressure equalization to atmospheric conditions. Consult appropriate sections of this catalog or the factory for guidelines regarding proper sizing of the receiver tank and receiver vent connection. • Plan the installation of the receiver tank so it sits above the Pressure Motive Pump to maintain proper fill head above the top of the pump to ensure condensate enters the PMP by gravity. In most instances, the receiver tank should also be positioned below the incoming high pressure condensate delivery lines. • Proper installation of the pump vent line is critical to ensure the system operates correctly. For best results, connect the pump vent line directly to the top of the receiver tank or to the receiver vent line making certain to avoid obstructions or low points. Consult factory for additional information. • Low-cracking pressure (1/4 PSI opening pressure) check valves should be installed after steam traps whe discharging into condensate return lines. Check valves eliminate the possibility of condensate backing up through the steam trap into the system.
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www.watsonmcdaniel.com •• Pottstown PA • USA • Tel: 610-495-5131
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