Twin Screw Pump

Twin Screw Pump

In industry, twin screw pump is a used for a variety of applications, from transferring hazardous liquids to moving viscous materials, twin screw pump is a commonly used for moving fluids and transferring chemicals in industries such as food processing, petrochemical products, pharmaceuticals, cosmetics, and more. As their name suggests, these pumps have two screws that rotate in opposite directions, which helps to move fluids more effectively.

Twin screw pump is a positive displacement (PD) pumps that use two opposed screws to push fluid through the pumping chamber. As the screws turn, pockets of fluid are drawn in and then pushed along until they've discharged out the other side. These specialty PD pumps are often used when high-pressure output is required or where shear-sensitive materials need to be handled without degradation. In some cases, one or both of the screws can be tapered so that they're narrower at one end than the other. This design helps increase volumetric efficiency.

Twin screw pump configurations can be either inline or lobe type – each with its own unique benefits and disadvantages that should be considered before making a purchase decision. When configured as an inline twin screw pump, both screws share a common shaft running parallel to the center line of the housing/pump body."

If you're curious about how these versatile pumps can be used in your business, read on to learn more about twin screw pumps and their many uses.
 

Twin screw pump code:

Handling various medium without solid.
Viscosity:
1-1500mm²/s, the viscosity can reach up to 3 x 10⁶mm²/s when reduced the speed.
Pressure range:4.0MPa
Capacity range:1-2000m³/h
Temperature range:-15℃-280℃

Series code specification :
W-horizontal pump                V-vertical pump

Size and variety code specification:
The pumps of Chongqing Hongar Industries Co., Ltd are divided into two consturctions:horizontal and vertical, there are 2 ,3,4,5,6,7,7T',8,9 , 10sizesand altogether 10.The combination of sizes and variety is showedas following table :

Type code specification:
Twin screw pump has 3 main constructions:Z,ZK and Zi.

► Z-long shaft design:Packing seal,doudle end seal or metal seal is required
in design,when the medium temperature exceed 150-200°C.

► ZK-short shaft design:adopt mechanical seal, medium temperature<120°C.

► Zi-Internal bearing design:Adopt mechanical seal,medium temperature<80°C, onlyusedfordeliverylubricantmedium

The leading features of twin screw pump:

Delivery various medium smoothly without any disturbing and pulsation.There aremedium to be pumped throughout in the woring elements as sealing liquid which guar-anteed by the construction of pump casing.All of the pump possess high self primingability and can deliver the liquid mixtured with gas or air.

The high suction performance,i.g very low NPSHr was guaranteed by the special de-sign of pump.

Adopted the external bearing which lubricated individually, so can deliver variousnon-lubrication medium.

Adopted synchronous gear, there is no metallic contact between rotaing parts,thereis no dangerous even dry running in a short time.

Various construction completely such as horizontal, vertical and casing with liner,and so on. the pump can handle various clean liquid without solid grain, low or highviscosity medium, even can deliver some corrosive medium with a correct material se-lection.


◆ Ship building: used for marine as cargo and stripping pump, ballast pump, lubricat-ing oil pump for main machine,feul oil transfer and spray pump,load or unload oilpump.
◆ Power plant: Heavy and crude oil transfer pump, Heavy oil burning pump.
◆ Chemical industry: Transfer for variovs acid,alkali solution,resin,colour,printing ink,paint glycirine and paraffin wax.
◆ Oil refinery: Transfer for various heating oil, asphalt oil, tar,emulsion,asphalt,andalso loading and unloading various oil goods for oil tanker and oilpool.
◆ Food industry: used for brewery,food products factory,sugarrefinery, tin factory totransfer for alcohol, honey,sugar juice,toothpaste,milk cream,soysauce,vegetable oil,animal oil and wine.
◆ Oil field: Transfer for various oil goods and crude oil and etc.

Notes of selecting pump:
1 ,First,should make sure the temperature of operating condition,if thetemperature is less than 120°C,it is best to select the ZK design.
2 ,If the pumped medium with good 1 ubrication,such as lub.oil and foodoil,select the design Zi pump that is reliable and economical.
3, Depend on the viscosity of medium umder working temperature tochoose the rotating speed n:in case v ≤1000mm²/s,it is right to choose n=1450r/min.when v=1000-1500mm²/s,please take care to consider the NPSH value.If v<1500mm²/s,please contact with the manufacturer and thespecialist to give you a satisfactory service.
4,Preliminary choose the pump size corresponding with the capacity and pressure which you desired from the performance table of series W.V twin screw pump.
5,Calculate the fluid flowing velocity VF in axial acording to the pitch h from pump performance talbe (for example the size2.1-24,the number 24 means pitch h in mm),VF=n x h/60(m/s).then calculate the NPSHr value as following: NPSHr=(1.5+0.253VF 1.84345+0.0572VF 1.55)*v 0.4146 where: v:vis-cosity (°E) of medium umder working temptrature.take v as value 5° E when v≤40mm²/s,when V>40mm²/s,1mm²/s=1/7.6°E.
6,If NPSHr of pump is less than NPSH,of suction pipe,the selected pump is correct.If NPSHr is bigger than NPSH, should choose the pump size bigger with pitch less.Then verificate the NPSHr value again.
7,After selecting the pump size,find out the different pressure △P, capac-ity Q and power N Corresponding to the viscosity v of the pump from the table,then choose the maching motor with sufficient power Nm.Nm≥K·N.The value K is showed in the table:

8 ,The working drawing of foundation will be designed after selecting the pump by customer,please ask for the outline dimension of the unit of pump and motor to the Screw Pump Resesrch institute of "Chongqing Hongar Industries Co., Ltd."
 

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