Water Passage Design
MTH has combined sixty years of water passage design with
a multistage mechanical concept to achieve maximum capacity
and pressure while minimizing horsepower requirements. By optimizing
the number of pumping stages with each water passageway, MTH
improves both efficiency and pressure in the 140 • 240
• 180 • 280 Series, exceeding the standards realized
by previous techniques.
Impeller Profile
One of the most notable improvements in regenerative turbine
pump technology incorporated in 140 • 240 • 180
• 280 Series pumps involves the ability to determine the
optimum impeller width and blade length. These factors have
a significant effect on the required horsepower versus pressure
curve for regenerative turbine pumps. By optimizing these for
each 140 • 240 • 180 • 280 Series pump, peak
efficiency is improved and “off peak” horsepower
requirements are reduced as well.
Impeller Blades
After the most favorable impeller profile has been determined
for a particular water passageway cross-section, MTH calculates
the number of blades needed to maximize the performance of that
pump. Current blade design in 140 • 240 • 180 •
280 Series pumps increases both efficiency and design pressure
without the manufacturing difficulties associated with producing
contoured blade impellers.
State-of-the-art computer controlled machines simplify manufacturing
of the various MTH impellers utilized in the 140 • 240
• 180 • 280 Series. The result is a high performance
pump providing efficiency characteristics exceeding those of
more expensive units.
NPSH Requirements
140 • 240 • 180 • 280 Series regenerative
turbine pumps meet low net positive suction head (NPSH) requirements
without efficiency loss. This is achieved by keeping the inlet
fluid velocity low and then gently accelerating to passageway
velocities.
200 Series
Inducer for Low NPSH |
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240 • 280 Series regenerative turbine pumps provide
exceptionally low NPSH requirements to suit boiler feed
water deaerator applications.
This reduced NPSH is obtained by using a first stage
centrifugal Francis vane impeller with inlet flow paths
shaped to maintain a constant fluid velocity. This reduces
entry losses to the impeller as well as maintaining pump
efficiency. A multi-vane diffuser is used in conjunction
with the centrifugal impeller for balancing radial loads
and extracting the maximum pressure from the flow produced
by the first stage impeller. Pressure and flow produced
by the low NPSH inducer assures that the succeeding stages
are adequately fed. |
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