Low NPSH Industrial Boiler Feed Pumps

Developed to pump 230˚F deaerated water from the deaerator to the boiler. This original design has now been improved to include high capacity models fully functional at one foot NPSH. All Roth one foot NPSH deaerator pumps are end mounted with two moisture protected ball bearings. No process lubricated bearings.

End Mounted Pump

The Roth Pump Company is the only pump manufacturer in the world today that offers a line of pumps with full performance at one foot NPSH at speeds of both 1750 and 3500 RPM in a range of differential heads up to 600 feet TDH, capacities up to 190 GPM. All Roth pumps in this bulletin are guaranteed to deliver full rated capacity of boiling water to the boiler with only one foot NPSH.

  • Capacity increases proportionally with the speed ratio. Head increases as the square of the speed ratios. Power input increases with the cube of the speed ratio.
  • Capacity and head in feet of liquid are uniform for all specific gravities in liquid range.
  • The power input is proportionate to the specific gravity of the liquid.
  • The viscosity limitation of both is about 200 centistokes or 1000 SSU.

ROTH TURBINE DESIGN INCREASES THE CENTRIFUGAL'S PRESSURE AND LOWERS THE OPERATING SPEED

The regenerative action turbine pump takes over where the centrifugal stops. Following are those areas in which the ROTH turbine pump surpasses the conventional centrifugal pumps:

  • Turbine impellers develop pressures many times higher than those of the centrifugal running at twice the speed of the turbine.
  • Many applications which require 3500 RPM with conventional centrifugal impellers are better handled at only 1750 RPM with the ROTH turbine.
  • ROTH turbine pumps in many installations can run quieter and outlast the conventional centrifugal pump in the same service because they develop pressure at slower speeds; pump hot water with low suction head; and are free of the cavitation inherent in centrifugals under certain conditions.

More and more engineers are specifying "centrifugal or turbine" pumps for application within range up to 200 GPM and up to 300 PSI in order to permit cost and performance comparisons with conventional centrifugal pumps.

In such cases it is recommended that electric motors for drivers be specified as "non overloading at design point with overload and under voltage protection." This permits consideration of smaller motors when the pump selected has improved efficiency.

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