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Axial Split Casing Centrifugal Pump .pdf

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Croos Pump (Shanghai) Co., Ltd
Axial Split Casing Centrifugal Pump
NMZ/NMZV pump is single stage, axial split case, double suction, between bearing centrifugal
pump. It’s suitable for pumping clean water or slightly contaminated water or liquids which are
physically and chemically similar to water, where large quantity and certain head are required.
The casing is axially split into two parts. The upper part (lighter) and lower part of the casing
differ in weight. The inline suction and discharge nozzles are cast in the lower half casing. This
design makes it easy to remove the upper casing and rotary components without disturbing the
motor and the pipework.
The closed double suction impeller can lower the NPSHr due to each impeller eye only handles
half of the total pump flow rate. And it also can increase the efficiency through back-to-back /
double suction impeller design, as the power is not lost to balance the hydraulic thrust.
The bearings are located on both sides of the rotor, which reduces the deflection of the shaft and
make the pump runs more stable.
Pumps generating high heads have dual volutes to reduce radial forces, ensuring minimal shaft
deflection and low bearing loads.
And it’s with a wide installation versatility, the pump can be produced in horizontal or vertical
mounting, clockwise or anti-clockwise rotation, side suction or bottom section.
NMZ Type Horizontal Split Case Centrifugal Pump
NMZV Type Vertical Split Casing Centrifugal Pump

Tel: +86-21-64092786

Email: export@croospump.com

Croos Pump (Shanghai) Co., Ltd

Selection step of axially split pump

1. List the basic data of the axially split pump, including the characteristics of the
medium, the particle diameter and quantity of the body contained in the medium,
medium temperature, the required flow pressure pipeline system data.

2. Determine the flow and pumping lift.

(1) Determination of the flow

a. If the production process has been given the minimum, normal and maximum
flows, maximum flow shall prevail.

b. If the production process is only given the normal flow, certain margin should be
left. For ns>100 large flow and low lift pump, the flow margin shall be 5%;
for ns<50 small flow and high lift pump, the flow margin shall be 10%; for 50≤ns≤
100 pump, the flow margin shall also be 5%; for pump with poor quality and bad
operation conditions, the flow margin shall be 10%.

c. If the basic data only contain the weight flow, it should be converted to the
volume flow.

Tel: +86-21-64092786

Email: export@croospump.com

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