Screw pump design pdf

F Right Side B. Deflection observed in Staad is 2. M Deflection observed in Staad is 1. Deflection observed in Staad is 0. Check S. L 23 Avg Pressure cause cantilever B. M Critical Section for Bending Moment 0. L 22 L 27 M Critical Section for Bending Moment 1. M Critical Section for Bending Moment 1 L 29 L 32 L 36 L These counterforts are designed for critical bending moment , Axial compressive force and Lateral shear.

Working Stress method of design is used for design of counterfort. The obtained data is used for design of beam using M. S Excel Analysis-Design data Plate stresses are obtained for each unit meter and results are sorted for Critical Bending moment,Axial Stress and shear stress. Generally, these types of pumps are not considered within the family of the screw-pump.

Because the rotor in these pumps are not like a usual screw but somewhat a twisted round shaft. These pumps are also named as the double screw pump, and it is the most general type used high power applications like weighty oil tube transfer. These pumps are also named as the triple screw pumps, and these are usually used in small applications like lubrication systems.

The screws in the pump are determined from the motor to rotate the remaining two screws which are around it without using timing gears. These pumps are basically two screw pumps, however with two screws for each rotor in opposite directions. Similar to the double screw pump, this pump includes a timing mechanism to make the second rotor run.

These pumps are mostly similar like a triple screw pump; however with five screws, not three screws. Similar to the 3 screw pump, this pump includes one diving rotor that drives all the remaining screws.

This type of pump is frequently used in many applications like tube oil otherwise hydraulic. Thus, this is all about screw pumps uses, sometimes these pumps are selected based on single suction otherwise double suction. The two screw pumps design is single suction where the liquid enters from one side and exits from another side.

Similarly, four screw pumps design is double suction which includes the suction stream that divides into both ends and flows through an exit in the middle. Here is a question for you, what are the problems occurred while operating these pumps? The liquid might be trapped either into multiple or one screws based on the pump construction.

The crucial functionality is that the absorbed water moves towards the outer section and then towards the center internal to the pump casing. Through this mechanism, water in all directions moves towards empty space thus invalidating the impacts of directional thrust offering hydraulic stability to the whole pump construction. This working principle shows the effect on pump functionality, output deviations, efficiency and bearing life. As because of the inclination to produce an extended level of vacuum pressure, this pump does not need any kind of priming and so they are self-primed.

In general, screw pumps are operated in the range of rotations per minute. These pumps can be of many types based on the number of screws, constructional change, and percentage share. Irrespective of all these factors, a general screw pump design is constructed with the below parts:.

It is the revolving part of the screw pump that assists in pumping the liquid at the constant volumetric level at any location of the revolution. The crucial functionality of this part is to propel the driven screw through timing gear.

To make sure of hydraulic stability, both driven and driver screws have opposing directions and this position allows the fluid to move axially to generate the non-pulsating results. When the driver and driven screws are unchecked, it might lead to some unexpected situations. In that case, timing gear is installed to verify those kinds of situations.