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Condensate Pump Selection & Sizing
Select the unit based on the load rate, discharge pressure required, and on the likely return temperature. On all applications and to prevent pump cavitation, we recommend specifying 2-Stage 2' NPSH pumps. We recommend this to avoid costly maintenance on the pumps should steam traps blow through (and we all know they will) and create high temperature returns.
The standard procedure for sizing the actual receiver (tank) is for one and one-half (1-1/2) minutes NET* storage based on the system return rate. The reasons for this are as follows:
Pumps are also sized based on system return rate. Use a factor of three (3), three times (3X) the condensing rate to allow for extra capacity on a cold start as well as intermittent operation.
Figure Receiver Volume-NET* Capacity: Divide pounds of steam per hour (PPH) by 500 to attain GPM. Multiply GPM times 1.5 to attain Net* Storage capacity.
Figure Pump Capacity-GPM: Divide pounds of steam per hour (PPH) by 500 to attain GPM. Multiply GPM times 3 to attain required pump GPM.
* NET STORAGE CAPACITY= The actual useable storage in the receiver tank. This is the point between where the float switch stops the pump from operating and the bottom of the inlet pipe to the receiver. Gross storage is the actual tank volume and is really irrelevant from the standpoint of sizing. This is the number manufacturers use for specifying tanks.
Flotronics Cast Iron Tanks Are Warranted for Thirty (30) Years Against Failure Due To Oxygen Corrosion and are available in sizes of 9 Gallon to 3000 Gallon.
Standard Rectangular Cast Iron Tanks .
| GROSS | NET |
| 9 Gallons | 6 Gallons |
| 15 Gallons | 8 Gallons |
| 21 Gallons | 13 Gallons |
| 36 Gallons | 20 Gallons |
| 52 Gallons | 30 Gallons |
| 75 Gallons | 40 Gallons |
| 120 Gallons | 81 Gallons |
| 175 Gallons | 126 Gallons |
| 250 Gallons | 190 Gallons |
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