PMP & PUMP-TRAP APPLICATIONS CONDENSATE DRAINAGE using Vertical Reservoir and Pump-Trap
PURPOSE:
For drainage of condensate from below process equipment where fill head is limited due to height restrictions and a horizontal reservoir cannot be installed.
OPERATION:
This system functions similarly to the system shown on page 455. However, when fill head is restricted due to heat exchanger height above ground, consider a vertical reservoir in lieu of a horizontal reservoir. This would accommodate condensate back-up as well as provide sufficient vapor space for the adequate venting of the pump while providing sufficient fill head to ensure proper operation of the pump.
INSTALLATION GUIDELINES:
(see Figure 25)
• The vertical reservoir must be properly designed and installed to allow adequate condensate back-up during the pump’s discharge cycle (i.e. when not filling), unobstructed venting of the pump, as well as sufficient fill head to ensure proper pump and system operation. Consult factory for additional assistance. • Proper installation and piping of the pump vent line is critical to ensure the system operates correctly. Follow guidelines or consult factory for additional information. • When using a pump-trap with integral steam trap, the trap has been sized in conjunction with the pump. If an application requires the higher capacity capability of a pump-trap with an external steam trap, the steam trap after the pump must be sized in conjunction with the pump to ensure proper function as a system. Improper sizing may potentially dangerous waterhammer. Consult appropriate sections of this catalog or the factory for guidelines regarding proper sizing of the pump-trap combination. • Low-cracking pressure (1/4 PSI opening pressure) check valves should be installed after steam traps when discharging into condensate return lines. Check valves eliminate the possibility of condensate backing up through the steam trap into the system. . • The thermostatic air vent located on the heat exchanger promotes optimum heat transfer. The air vent improves heat-up times and overall heat transfer by expelling accumulated air on start-up. When properly sized and installed, the pump-trap combination can operate in sub-atmospheric (i.e. vacuum) conditions; therefore, a vacuum breaker should not be used.
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www.watsonmcdaniel.com •• Pottstown PA • USA • Tel: 610-495-5131
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