Steam Condensate Pumping
Specification Checklist for Steam Condensate Units
- Pump flow rate
Typically 2 times the normal (not peak) condensate flow rate.
- Total Dynamic Head (max.)
Calculated when pumps are operating at the actual pump flow rate (which may be a bit higher than specified flow rate) and with worst case back pressure condition. Consider all other sources of condensate that may flow into condensate header.
- TDH (Min)
Specify so that in worst case the NPSHR (+3 ft. for centrifugal pumps) is still less than the NPSHA. Look at minimum back pressure in discharge line and highest liquid level on suction side.
- Temperature
Worst case, considering distance of condensate receiver from condensing source, and likelihood of steam trap failure.
- Inlet height for condensate
Specify the minimum for which the receiver must be designed.
- Receiver size
Consider one or two sizes larger. Allows for increase in capacity without insulation and piping changes.
- Plot area
What is maximum allowable?
- Controls
Specify NEMA designation. Does not necessarily have to be similar to motor designation.
- Pump materials of construction
What chemicals may be used in boiler treatment and condensate treatment system. Amines and sulfites are of particular importance. What about future?
- Mechanical seals / Packing
High performance seals used above 212F. Packing used where seal failure may cause problem.
- Pump speed
1750 RPM is desirable. Seal and bearing life much better than at 3500 RPM.
- Pump type
Regenerative turbine pump: non-cavitating, stable flow rate.
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20575 Center Ridge Road, Suite 110 • Cleveland, OH 44116 • Ph (440) 331-7181 • Fax (440) 331-7108
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