HRC Series Sealless Centrifugal Reverse Circulation Installation
The above diagram shows the typical piping of a reverse circulation HRC
Series pump. Although the HRC reverse circulation pumps are designed to
remove entrained gas from the fluid, careful adiabatic analysis of the
entire system is required for successful operation. In addition, the following
recommendations are very important for efficient operation and maximum
service life of the product.
We recommend that the tank and piping be designed to provide the pump
1.5 times more NPSH availability (NPSHA) than that required by the pump
(NPSHR).
To maintain NPSHA, it is highly recommended that the selected suction
piping should be twice the diameter of the pump suction all the way from
the tank to the pump inlet, and that elbows and bends should be minimized
as much as possible.
Carefully consider the size and selection of valves and filters used in
the suction pipe since these are typical sources of flow disruptions that
increase flow resistance and cavitation effects.
To prevent the formation of gas pockets, minimize horizontal piping and
eliminate sharp bends and dips.
Be careful not to mechanically stress the pump inlet and outlet. Use properly
supported piping with stress buffers like expansion joints or other means
to support the weight of piping and reduce the possibility of thermal
pipe expansion strain.
Where excessive pump discharge capacity is expected, the careful use of
an orifice plate on the pump discharge can resolve the problem.
Make a positive confirmation that each piping connection is leak free
before full system startup.
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