[Rotating Equipment] Chapter 4 & 5 - Pumps

73 flashcards · Other · by Ahmed Adil

1. Pumps definition

   A devices used to transfer liquids from one place to another by applying energy to the liquid being transferred.

2. List 3 prime movers for pumps

   Electric motor Gas/steam turbine Internal combustion engine

3. Dynamic Centrifugal Radial flow Mixed flow Axial flow Single suction Double suction Single stage Multi stage Self priming Non priming Single stage Multi stage Open impeller Semi open impeller Closed impeller Open impeller Closed impeller

4. Dynamic pump What is the flow type?

   Radial flow The liquid travels radial to the shaft

5. Dynamic pump What is the flow type?

   Axial flow The liquid travels parallel to the shaft (along the axis of the shaft)

6. Dynamic pump The pressure is developed wholly by centrifugal force. A. Axial flow B. Radial flow C. Mixed flow

   B

7. Dynamic pump The pressure is developed by the propelling or lifting action of the vanes of the impeller on the liquid. A. Axial flow B. Radial flow C. Mixed flow

   A

8. Dynamic pump The pressure is developed partly by centrifugal force and partly by the lift of the vanes of the impeller on the liquid. A. Axial flow B. Radial flow C. Mixed flow

   C

9. Dynamic pump What is the flow type?

   Mixed flow

10. Dynamic pump Type of flow based on impeller

    Axial flow Axial flow pumps are also called propeller pumps because they use impellers with blades similar to those of a ship propeller. used for large volumes and low to intermediate pressures.

11. Dynamic pump Type of flow based on impeller

    Mixed flow used for large volumes and low to intermediate pressures

12. the force that acts on a body moving in a circular path, tending to force it away from the center of rotation causing an increase of its velocity.

13. Dynamic pump Operating Principle of Centrifugal pumps

    The liquid enters at the center of the rotating part (impeller) inside the casing of a centrifugal pump. The liquid is then thrown outward by the centrifugal force of the impeller at maximum velocity into the gradually expanding passageway of the casing.

14. Casing split the split is parallel to the shaft axis. A. axial split casing B. Radial split casing

    A

15. Casing split the split is at right angle to the shaft axis. A. axial split casing B. Radial split casing

    B

16. Dynamic pump Casing split

    Radial split casing Axial split casing

17. Dynamic pump

    Single stage, radial flow, centrifugal pump

18. Dynamic pump

    Single Stage horizontal Centrifugal Pump

19. Dynamic pump

    Single Stage Vertical in Line Centrifugal Pump

20. Dynamic pump

    Single Stage Vertical Centrifugal Pump

21. Dynamic pump

    Multistage Radial Flow Centrifugal Pump When a high discharge pressure is required, multistage pumps are used. In multi- stage centrifugal pump the discharge of one impeller is connected to the suction of the next impeller and so on.

22. Dynamic pump

    Multistage vertical Centrifugal Pump

23. Dynamic pump Type of flow in this pump?

    Radial flow

24. Dynamic pump Discharge nozzle Impeller Suction nozzle Casing Mechanical seal Shaft Seal chamber Bearings

25. Dynamic pump Volute casing vs Diffuser casing

26. Dynamic pump In centrifugal pumps the annular chamber between the shaft and casing where sealing media are installed. When the sealing is achieved by means of a mechanical seal, the chamber is commonly referred to as a seal chamber. When the sealing is achieved by means of packing, the chamber is referred to as a stuffing box.

27. Dynamic pump Types of impeller

    Closed impeller Semi open impeller Open impeller

28. Dynamic pump Impellers can be either single or double suction. Single suction Double suction

29. Dynamic pump What is the function of wearing rings

    joint between the impeller and the casing to keep leakage from discharge to suction

30. Dynamic pump What is the function of Shaft Sleeve

    protects the shaft from erosion, corrosion, and wear

31. Dynamic pump What is the function of Coupling

    Coupling connects the pump to the driver and transmits torque and rotation to the pump

32. Dynamic pump Type of coupling Flexible Rigid

33. Dynamic pump What is the function of bearing

    Bearings allow the shaft to rotate freely and prevent radial and axial movement of the shaft.

34. Dynamic pump Types of bearings Rolling Plain

35. Dynamic pump Bearings require lubrication which is either oil or grease. Generally with rolling bearings the small pumps tend to be grease lubricated and large pumps use lubricating oil. Plain journal bearings are only lubricated by oil.

36. Dynamic pump Types of seals Compression packing Mechanical seal

37. Dynamic pump Compression packing parts Stuffing box Packing gland Packing rings Lantern ring Shaft sleeve

38. Dynamic pump Total Static Head Static Suction Head Static Discharge Head Static Discharge Head Static Suction Lift Total Static Head

39. What is head

    The vertical distance from pump centre line to the surface of a liquid, representing the maximum height or pressure that a pump can deliver

40. What is static suction head and static suction lift? And what is the difference between them.

    Both mean the vertical distance from the liquid supply surface to the pump centre line. The difference between them is the level of the supply: Static suction head: liquid supply level is above pump centre line. Static suction lift: liquid supply level is below the pump centre line.

41. What is static discharge head

    The vertical distance between the pump centre line and the surface of liquid in discharge tank

42. What is total static head

    The vertical distance between the surface of the liquid supply and the surface of the liquid in discharge tank

43. What is NPSH

    Net Positive Suction Head is the difference between the inlet pressure and the lowest pressure level inside the pump

44. What is NPSHR

    The minimum head required by the pump to prevent cavitation

45. What is NPSHA

    The actual head available at the pump suction

46. What is cavitation

    The formation of bubbles in liquid which lead to rapid reduction in velocity.

47. List 2 situations were cavitation occur

    When NPSHA is less than NPSHR When the pressure inside the pump drop below the vapour pressure of the liquid being pumped

48. List 2 results of cavitation

    Damage to the impeller Damage to the pump casing

49. Maintenance of a single stage radial split centrifugal pump Which task is this

    Shaft run out check

50. Maintenance of a single stage radial split centrifugal pump Which task is this

    Axial movement of the shaft check

51. Maintenance of a single stage radial split centrifugal pump

    Impeller run out check

52. Maintenance of a single stage radial split centrifugal pump

    Shaft sleeve run out check

53. Maintenance of a single stage radial split centrifugal pump Stuffing box run out The acceptable stuffing box run out is 0.025 mm per 25 mm Shaft diameter and up to a maximum 0f 0.125 mm.

54. Maintenance of a single stage radial split centrifugal pump What is this check and how do we calculate it

    Wear ring clearance Inside diameter of casing - outside diameter of wear ring

55. Positive displacement Reciprocating Piston Plunger Steam Double acting simplex Duplex Lobe Power Single acting Double acting Simplex Duplex Triplex Multiplex Diaphragm Simplex Multiplex Fluid operated Mechanically operated Rotary Single rotor Screw Vane Multiple rotor Screw Gear

56. The is working principle of positive displacement pumps

    Positive displacement pumps works on the principle that no two objects can occupy the same space at the same time.

57. The flow of liquid through a reciprocating piston pump is controlled by check / non return valve.

58. Explain the cycle of the piston pump

    At the beginning of the backward stroke, both suction and discharge valves are closed. As the piston moves backward the pressure in the cylinder decreases below the suction line pressure. Suction valve opens, discharge valve closes and the liquid enters the cylinder. As the piston moves forward, cylinder pressure increases. The suction valve closes and the discharge valve opens. and a volume of liquid is displaced from the cylinder on the piston forward stroke.

59. Positive displacement pumps Which type of pump is this

    double acting piston pump

60. Positive displacement pumps Which type of pump is this

    Mechanically operated Diaphragm pump

61. Which type of pump is this

    Gear pump

62. Gear, screw and lobe pumps are commonly used as

    lube oil pump

63. Which type of pump is this

    Internal gear pump

64. What prevent backflow in internal gear pump

    stationary crescent seal

65. Which type of pump is this

    Lobe pump

66. Which type of pump is this

    sliding vane pump

67. Sliding vane pump is commonly used as

    Vacuum pump

68. Name the pumps

    Two screw rotary pump Multiple screw rotary pump

69. Dynamic rotary pumps A single screw pump is generally known as

    Progressive cavity pump

70. Dynamic rotary pumps Name the pump

    Single screw/progressive cavity pump

71. Valves Plunger Packing Pony rod Crosshead Connecting rod Crankshaft Crankcase

72. What is the purpose for multiphase pumps

    The main purpose for multiphase pumps is to transfer multi-phase mediums or untreated production (oil, gas, water and solids) from sea floor ‘well-heads’ or manifolds to production facilities,

73. Positive displacement pumps Which type of pump is this

    Fluid operated Diaphragm pump