APPLICATION
VS is a kind of multifunctional products. It can be usd to convey various medium from tap water to industrial liquid at different
temperature and with different flow rate and pressure. It is suitable for slightly corrosive liquid.
¡ù Water supply: Water filter and transport in waterworks, boosting of main pipeline, boosting in high-rise buildings.
¡ù Industrial boosting : Process flow water system, cleaning system, High pressure washing system, fire fighting system.
¡ù Industrial liquid conveying : Cooling and air-conditioning system, boiler water supply and condensing system,machine associated purpose, acids and alkali
¡ù Water treatment: Ultrafiltration system, reverse osmosis system, distillation system, separator, swimming pool
¡ù Irrigation : Farmland irrigation, spray irrigation, dropping irrigation
OPERATION CONDITIONS
¡ù Thin, clean, non-flammable and non-explosive liquid containing no solid granules and fibers.
¡ù Liquid temperature:
Normal temperature type: -15¡æ ~+70¡æ
Hot water type: +70¡æ ~+120¡æ
¡ù Ambient temperature: up to +40¡æ
¡ù Altitude : up to 1000m
PUMP
VS is a kind of vertical non- self priming multistage centrifugal pump , which is driven by a standard electric motor. The motor output shaft directly connects with the pump shaft through a coupling.
The pressure-resistant cylinder and flow passage components are fixed between pump head and in-and-outlet section with tie-bar bolts,The inlet and outlet are located at the pump bottom at the same plane.
This kind of pump can be equipped with an intelligent protector to effectively prevent it form dry-running, out-of- phase and overload.
Electric motor
¡ù Full-enclosed air blast two-pole standard motor
¡ù Protection class: IP55
¡ù Insulation class: F
¡ù Standard voltage,50Hz:1¡Á220-230/240V
3¡Á220-220/346-380V
3¡Á220-240/380-415V
3¡Á380-415V
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MINIMUM INLET PRESSURE NPSH
In case that the pressure in pump is lower than
the steam pressure used to convey liquid,the cavitations will occur.To avoid cavitations,a minimum pressure at the inlet side of the pump shall be guaranteed.The maximum suction stroke can be calculated with following formula:
H=Pb¡Á10.2-NPSH-Hf-Hv-Hs
Pb=atmosphere pressure [bar]
(can be set as 1bar)
In a closed system,Pb means system pressure[bar]
NPSH=Net positive suction head[m]
(It can be read out from the point of possible max.flow rate shown on NPSH curve)
Hf=Pipeline loss at the inlet [m]
Hv=Steam pressure [m]
Hs=Safety margin =Minimum 0.5m delivery head
If the calculated result H is positive,the pump may run under the max.suction stroke H.
In case the calculated result H is negative,a delivery head of min.inlet pressure is necessary.
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