Working principles of pumps

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1 Working principles of pumps History of Reciprocating pumps In 17 th century Egyptians in Alexandria built reciprocating fire pump and and it had all the parts of today s pump. About 1805 Newcomen (Great Britain) built a reciprocating pump using steam engine as the driver. He was the first man to use seam for driving purposes. In Worthington (U.S.A) developed a steam engine driven pump. Then many developments came. 1

2 History of Centrifugal pumps pumps The inventor ca not be name with assurance. In the 17 th century Jordan, an Italian had made some drawing of a centrifugal pumps. In the early 18 century French physicist Papin built a centrifugal pump of primitive design. In 1732 Demouir pumps was put on service in France, In 1818 Andrews ( USA) built a single stage centrifugal pump. Then many developments came in the industry... History of best pump Human heart. Everybody knows Who invented. 2

3 200 meters 100 Bar M 10 kms Pumps are used to move liquids from a lower pressure system to higher pressure From a lower elevation to higher elevation From one place to another place at different/same elevation and pressure. 200 meters 100 Bar M 10 kms Pumps add pressure energy to over come elevation needs ( potential energy) Frictional losses Delta pressure requirements Energy needed for pumps= volumetric flow*pressure 3

4 Power required for pumping Power = mass X dynamic head Power ( kw)= H Q r/ H = Total head in meters Q=Flow M 3 /H r=density in Kg/M 3 Power ( kw)= H Q r/35.99 H = Total head in bara Q= Flow M 3 /H r=density in Kg/M 3 Pleased divide by efficiency for actual power Please refer Perry How to give energy? Centrifugal force (throwing) Positive displacement (physically pushing) 4

5 Centrifugal pumps Working principles centrifugal pumps 5

6 Advantages of centrifugal pumps 1. Impeller 2. Casing 3. Eye 4. Seal/packing 5. Wear ring Parts of a centrifugal pump 1. It simple and easy to construct. Available in different materials. 2. Absence of valves. Less maintenance. 3. High rpm design. Can be coupled to a motor directly. 4. Steady delivery. 5. No damage in delivery is blocked. 6. Smaller in Size when compared to reciprocating type for the same capacity. 7. Can handle slurries. 6

7 Dis-Advantages of centrifugal pumps 1. For high pressure we need multistage pump which are complex to construct. 2. Efficiency is high only over a range.( explain graph) 3. Usually not self priming 4. Non return valve is needed in the delivery to avoid back flow. 5. Very viscous fluid can not be handled/ Types centrifugal pumps Typical classification Single stage Multistage Explain why and how 7

8 Multi stage Single stage Multistage pumps are used to limit rpm and whenever we have high DP. Example BFW pumps. 8

9 Thrust balance centrifugal pumps 1. Double suction pumps 2. Thrust balance in multistage pumps Stage arrangement 3. Thrust balance line and thrust disk and bearing Double suction pumps Sea water 9

10 Double suction pumps 323-J UREA Multistage pumps Thrust balance in a multi-stage pump 10

11 Multistage BFW Pump Ammonia Multistage pumps In Out Thrust balance in a multi-stage pump Explain the principle of balance disc Thrust balance line and caution 11

12 Multistage pump Explain thrust balance Positive displacement pumps 12

13 Positive displacement pumps Reciprocating Rotary Reciprocating Pumps Piston type Plunger type Vertical& Horizontal & double acting Diaphragm pump 13

14 Reciprocating pumps Explain double acting, plunger type, vertical, horizontal, multistage Diaphragm pumps 14

15 Diaphragm pumps Diaphragm Reciprocating pumps Basic principle is similar to a reciprocating plunger pump/ Plunger pressurizes the hydraulic oil which when pressurized pushes the diaphragm and discharge starts. Stroke length can be adjusted and hence the dosing flow rate. No direct contact of plunger with the solution. 15

16 Diaphragm Reciprocating pumps Diaphragm Reciprocating pumps Figure 1: The air valve directs pressurized air to the back side of diaphragm "A". The compressed air is applied directly to the liquid column separated by elastomeric diaphragms. The compressed air moves the diaphragm away from the center block of the pump. The opposite diaphragm is pulled in by the shaft connected to the pressurized diaphragm. Diaphragm "B" is now on its air exhaust stroke; air behind the diaphragm has been forced out to atmosphere through the exhaust port of the pump. The movement of diaphragm "B" toward the center block of the pump creates a vacuum within the chamber "B". Atmospheric pressure forces fluid into the inlet manifold forcing the inlet ball off its seat. Liquid is free to move past the inlet valve ball and fill the liquid chamber. Figure 2: When the pressurized diaphragm, diaphragm"a", reaches the limit of its discharge stroke, the air valve redirects pressurized air to the back side of diaphragm "B". The pressurized air forces diaphragm "B" away from the center block while pulling diaphragm "A" to the center block. Diaphragm "B" forces the inlet valve ball onto its seat due to the hydraulic forces developed. These same hydraulic forces lift the discharge valve ball, forcing fluid flow to flow through the pump discharge. The movement of diaphragm "A" to the center block of the pump creates a vacuum within liquid chamber "A". Atmospheric pressure forces fluid into the inlet manifold of the pump. The inlet valve ball is forced off its seat allowing the fluid being transferred to fill the liquid chamber. 16

17 Diaphragm Reciprocating pumps Figure 3: Upon completion of the stroke, the air valve again redirects air to the back side of diaphragm "A", and starts diaphragm "B" on its air exhaust stroke. As the pump reaches its original starting point, each diaphragm has gone through one air exhaust or one fluid discharge stroke. This constitutes one complete pumping cycle. The pump may take several cycles to become completely primed depending on the conditions of the application. Gear and screw pumps High pressure and viscous fluids Used in Samd for lube and seal oil pumps air booster of ammonia, 102-J 17

18 Gear pumps High pressure and viscous fluids Example : lube/ seal oil pumps See the solution is pushed out of the pump physically 18

19 Only one gear is used ( Explain) Screw pumps High pressure and viscous fluids Example : lube/ seal oil pumps 19

20 SCREW PUMP Talk about selection, parallel operation, reverse running etc. SCREW PUMP 20

21 SCREW PUMP Talk about selection, parallel operation, reverse running etc. SCREW PUMP Talk about selection, parallel operation, reverse running etc. 21

22 Sealing in pumps Sealing in pumps Fixed sealing Packing Centrifugal and reciprocating Rotating Mechanical seal Centrifugal, gear pumps etc 22

23 Gland packing principles Impeller Gland Packing Stuffing box Explain packing stuffing box, heat generation and cooling techniques., Lantern rings,flushing,cost and choice etc. 23

24 Packing Packing Explain packing stuffing box, heat generation and cooling techniques., Lantern rings,flushing,cost and choice etc. 24

25 Impeller Mechanical seal Stuffing box Rotating Fixed Three sealing points of a mechanical seal ( 1,2, and 3) 25

26 Mechanical seals Mechanical seals 26

27 Mechanical seals Explain working, heat generation and cooling techniques, flushing,cost and choice etc. Mechanical seals Seal types 27

28 Mechanical seals Mechanical seals 28

29 Double seals Hazardous liquids Explain need, sealant glycol, flushing etc. Special Magnetic seals for hazardous/ expensive / corrosive fluids 29

30 Submersible pumps Self-priming as they are inside the liquid. Lube oil consoles, sump tanks, hazardous solution pumping etc. 30

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