There is more to sizing a pump for condensate return than just understanding the capacity/GPM required for the application. The variables that need to be understood are also different when sizing and selecting an electrical pump versus a mechanical pump.

These issues are explored in detail in this webinar. In it, TLV Corporation President Jim Risko explains how to select and use electrical/mechanical pumps; and ensure that condensate return pumping applications operate reliably.

0:00 Introduction
1:08 Electric Atmospheric Condensate Pumps
1:17 Electric Pressurized Condensate Pump Systems
1:32 Simple Condensate Return
2:48 Pumped Condensate Return
3:35 Typical Electric Condensate Pump?
3:51 Electric Pump Selection Criteria
4:04 Electric Pump Requirements
4:58 Flashing Causes Cavitation
5:20 Condensate Pump Cavitation
7:15 Mitigate Impeller Damage
11:01 Condensate Pumps: Electric Requirements
12:06 Actual v Design Pumping Load
16:32 Service Factor / Life Considerations
18:51 Negative Differential / Back Pressure Causes
19:59 Total Dynamic Head (TDH) - Back Pressure
21:18 Total Discharge Pressure (TDP)
23:01 3500 RPM Pump ("High Efficiency")
27:17 3500 RPM Pump Characteristics
28:58 1750 RPM Pump ("Low NPSH")
31:35 1750 RPM Pump Characteristics
33:04 Net Positive Suction Head (NPSHA)
34:09 Water Vapor Pressure Table
34:55 Example: Net Positive Suction Head (NPSH)
36:09 3500 High RPM: NPSHR NPSHA
36:55 Decrease Temperature - Vapor Pressure Table
37:10 Cool Temperature 3500 High RPM: NPSHR
37:37 Elevate Receiver 3500 High RPM: NPSHR
39:00 1750 Low RPM: NPSHR NPSHA
39:52 Flash Steam
40:19 Installation Requirements & Common Errors
42:50 Insufficient NPSHA
47:40 37.5 GPM @ 30 PSIG Electric Condensate Pump
51:14 Proper Installation
52:53 Design & Installation Requirements
53:50 VFD/VSD Motor Drive
56:06 Pressurized Condensate Return Systems
56:36 GP10 PowerTrap Operation
57:53 GP10 PowerTrap Pump
58:32 PowerTrap Pump MOTIVE
59:53 Steam is Wet

Find articles referenced and learn more about this topic in the Steam Theory section of the TLV website: [ Ссылка ]

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