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.
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?
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
See other pump products.