Presentation on vertical turbine

Precautions and handling of vertical turbine pump.

1. Presentation on Vertical turbine pump S ubmittedBy :- Abhishank Nigam M a d h a b h i s h a r m a JAWAHARLAL NEHRU KRISHI VISHWAVIDYALAYA JABALPUR (M.P)

2. Introduction:- A vertical turbine pump is a vertical axis centrifugal or mixed flow type pump which comprises stages which accomodate rotating impeller and a stationary bowl possessing guide vanes.

3. Principle:- The verticle turbine pump operates on modified radial flow centrifugal principle . Water enters in impeller near its center and is whirled out towards the periphery at high velocity by virtue of centrifugal force. The bowl has stationary guide vanes surrounding impeller As water leaves impeller it directed upwards , through velocity head converted into pressure head. Pressure head develop in bowl assembly depends upon diameter of the impeller and speed at which rotated.

4. . The pressure head developed by a single impeller known as single stage pump. For total head calculation we will have to multiply the total head from each stages to number of stages to get a combined value. The combine input energy in pump is sum of input energy of each stages. C ombine efficiency of multi stage pump is given by :- ɳ=Q(HS1+HS2) / 102(ps1+ps2) Where , Q =Discharge in (L/S ) HS =Head of each stage in (m), PS =BHP of each stages in kilowatt.

5. Construction:- Vertical turbine pump may be water lubricated or oil lubricated. It comprises mainly three parts:- 1) Pump element 2) Discharge column 3) Discharge head

6. Pump element:- It consists of one or more bowl or stages.Each bowl assembly consist of an impeller and diffuser and a bearing. The bowl assembly remains beneath the water surfce.It has a screen strainer fixed at bottom of pump is to keep the coarse ,sand and gravel from entering into the pump. Impeller are mainly three types:- Closed imeller Semi closed imeller Clogged impeller

7. Pump bowl assembly:- It is heart of vertical turbine pump .The impeller and diffuser type casing are designed to deliver the head and capacity that your system requires in most efficient way as possible. Standard design features:- 1 . Suction bell:- It allows smooth entry of water into the first stage impeller eye , and minimize foundation opening. 2. Suction bell bearing:- It provide stability to shaft.

8. . 3. Impeller :- semi open , enclosed for appropriate services. 4. Sleeve type bearing:- It is provided at each stages to assure stability . According to flow impeller may also be classified as:-

9. Discharge column:- It contains delivery pipe and shafting with coupling and bearing . The construction of column assembly differ with method of lubrication of pump i:e ; oil lubricated and water lubricated. When pump is oil lubricated ,then pump drive shaft is enclosed in a cover pipe ,which guides the flow of oil into the pump parts. When pump is water lubricated ,water is used for lubrication , which is pumped by the pump .

10. Discharge head:- The pump column assembly is fixed to discharge head , which is located at ground surface . The base of discharge head is bolted to pump foundation. Discharge elbow is equipped with flange to which discharge pipe may be fixed.

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15. Selection of vertical turbine pump:- Data for selecting vertical turbine pump:- 1.Depth of well, m 2.Inside diameter of well casing, m 3.Dimension of well pit, m 4.Depth to static water level, m 5.Capacity of pump, l/s 6.Drawdown –discharge curve of well. 7.Data of seasonal fluctuation of water table.

16. . 8 . Type of lubrication system. 9 . Source of power :- Electricity- (voltage, phase ) Stationary Engine-(Diesel /petrol, Tractor) Belt –pulley size and speed

17. PUMP DRIVE:- Power is supplied to turbine pump at the surface .One of main advantage of turbine pump is its adaptability to different types of drives and power sources.. The efficiency of drive mechanism may greatly affect the operating cost of pumping sets. The drive may be:- 1. Direct drive.. 2. Belt drive. 3. Gear drive. 4. Right angle drive.

18. Pump trouble and remedies:- Pump does not start:- Faulty electrical connection of motor. Pump is sand locked . Low voltage. Discharge packing is excessive tight. Impeller are locked or improper adjustment. Remedies:- Backwash the pump impeller with clean water. Raising or lowering the impeller and release them.

19. , Pump does not deliver water :- Pump suction broken. Pump speed is to low. Voltage is to low . Strainer clogged . Pumping head to high. Remedies :- clean the strainer with clean water, check suction point.

20. . Insufficient water and pressure :- Speed to low Water level is lowered . Impeller loose or damaged . Air in water . Worn out bearings. Column joints leaking. Remedies:- C hange the bearing if worn out. Maintain the proper speed by maintaining the voltage. Adjust the impeller. Change the sealing .

21. . Pump vibrates :- Speed to high . Bent shaft. Impeller rubbing against bowl. Loose impeller. Poor suction condition. Remedies:- Change the drive shaft. C heck cap nuts.

22. . Capacity to low.:- Head too high. Speed to low. Poor suction condition. Leakage in suction pipe. Mechanical failure like worn impeller , worn bearings etc .

23. . Maintenance of vertical turbine pumps:- For safe and efficient operation maintenance is very important. Weekly cleaning of bowl with clean water. Grease all parts properly. Tight all cap screw nuts properly. Change bearing if they are worn out. Clear dirt or foreign matter from strainer.

24. . Thank you …