Vertical Multi-Stage Centrifugal Pumps BL(T)

Vertical Multi-Stage Centrifugal Pumps BL(T)

High-efficiency standard motor, Japan NSK bearings and cold-rolled 50ww800 silicon steel sheet made the pump high efficiency, low noise and maintenance-free. Totally enclosed shaft seal, IP55 protection grade, F class insulation grade, the special "double-lock" drive end bearing made the pump withstand higher inlet pressure.

Balanced & container-type shaft seal with all the parts assembled together, no axial rotating to prevent the shaft and rubber parts from wearing, with the characteristics of rapid changing, easy installation and safe operation.Dynamic sealing is made of cemented carbide materials and the static sealing is fluorine rubber material which make the mechanical seal to be high temperature resistance, long service life, easy changing and other significant characteristics.

Being produced by the most advanced international laser welding technology,, no eliminate welding, ensure the high intensity and efficiency. The processing technology: precision casting, CNC lathe, CNC machining center, the modern advanced technology such as the laser welding technique and processing equipment.2T-4T is spot welding,16T and above is laser welding.

The built-in floating sealing ring of the pump cavity body could minimize the internal leakage produced by the differential pressure and prevent the energy consumption when liquid leaking back to the pump cavity body.

The pump core parts are designed to be multilevel interlocking, fastening nut locked, component system interlock assembly industry, to minimize the gap between the impeller per level, improve the efficiency of the impeller water conservancy, and ensure the stability, reliablity and efficiency of the pump core components.

Cold extrusion spline shaft with good surface quality, high machining accuracy, at the same time improve the comprehensive mechanical properties of the shaft and the reliability of the pump.

Model Instruction

Overview Of The Product

BL(T) series stainless steel multi-stage centrifugal pump (afterwards called pump)boasts characters of high efficiency,low noise, steady operation, etc.The pump set adopts the non-self-priming vertical multi-stage structure, which makes a compact whole,its installation easy, its operation and maintenance convenient.

Application Limits

◎

Medium temperature: normal type:0℃ ~68℃ hot water type:68℃ ~120℃

◎

Ambient temperature:+40℃

◎

Advisable to use motor of higher power in case that the density or viscosity of medium is above that of water.

◎

pH: 5 to 8

Application Limits

Certificate

Electric Motor

◎

Full-enclosed and ventilating two-pole standard motor

◎

Protection class: IP55

◎

Insulation class: F

◎

Standard voltage Single phase 220V-50Hz Three phase:220/380V-50Hz

Energy Efficiency Standard (IEC60034-1)

Calculation Of minimum Inlet Pressure

If the pressure in pump is lower than the vapour pressure of medium, cavitation will occur, which will affect the performance of pump. To avoid the cavitation and ensure the pump inlet has a minimum pressure, maximum suction head should be calculated as following:

Pb: Atmospheric pressure, bar (In close pipeline system, it can be considered as the system pressure );
NPSH: Net positive suction head, m (Value at maximum flow of Q-NPSH curve);
Hf: Suction pipe line loss (Value at maximum flow of corresponding pipeline);
Hv: Medium vapour pressure, m (Medium vapour pressure at corresponding temperature, the default medium is water, as shown in figure2 on the right );
Hs: Safety margin, m, general value is 0.5.
Calculation result: if H is positive, the pump is installed in suction way, otherwise, it is installed in downdraft way.
Note: It is not necessary to do above calculation under general conditions. Only when we use pump in the following situations do we need to calculate the H:

Selection Of Pumps

Duty point of the pump:

From a duty point it is possible to select a pump on the basis of the curve charts shown in "performance curves/technical" data.

Dimensional data:

When sizing a pump the following must be taken into accounting:

Pump efficiency:

Before determining the best efficiency point, the operation pattern of the pump needs to be identified. If the pump expected to operate as the same duty point, then select a BL pump which is operating at a duty point corresponding with the best efficiency of the pump.
As the pump is sized on the basis of the highest possible flow, it is important always to have the duty point to the right on the efficiency curve(eta) in order to keep efficiency high when the flow drops

Pump material:

Selection of pump connection depend on the rated pressure and pipe work. the pump offer a wide range of texible connection such as:

Commonly used mechanical seal configuration tables

Maximum Work Pressure

Maximum Ambient Temperature

When the pump is operating in the place where ambient
temperature is higher than 40℃ or altitude is higher than
1000m,the output power of motor P2 will decrease because of poor
cooling caused by low air density.Therefore,in that case,the pump should be equipped with high-power motor.