iKNOW Centrifugal Pump Repair |
Lesson Descriptions
This library consists of six lessons. This library is designed for all levels of maintenance personnel as well as for the multi-craft training needs of process and manufacturing facilities. Participants should be familiar with the basic operation of centrifugal pumps. |
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Lesson1. Troubleshooting Excessive Leakage |
| Prerequisites:
Participants should be familiar with the basic operation of centrifugal pumps. |
Topics:
- Sealing Surfaces
- Packing
- The Lantern Ring
- Mechanical Seals
- Troubleshooting the Leak
Objectives:
- Identify and describe the sealing surfaces on a centrifugal pump.
- Explain the purpose and conditions under which packing would be used.
- Explain the purpose of the lantern ring.
- Explain the purpose and conditions under which a mechanical seal would be used.
- Explain how to determine whether centrifugal pump leakage is excessive.
- Recognize causes and symptoms of excessive leakage.
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Lesson2. Troubleshooting Excessive Temperature |
| Prerequisites:
Completion of the lesson Troubleshooting Excessive Leakage is recommended. |
Topics:
- Flow through the Pump
- Bearings
- Operating Temperature
- Air Binding
Objectives:
- Explain the purpose of bearings in a centrifugal pump.
- Explain how normal operating temperature is maintained in a centrifugal pump.
- Recognize causes of symptoms of excessive temperature in a centrifugal pump.
- Discuss causes of symptoms of excessive temperature in a centrifugal pump.
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Lesson3. Troubleshooting Loss of Capacity |
| Prerequisites:
Completion of the lesson Troubleshooting Excessive Temperature is recommended. |
Topics:
- Pressure and Flow Rate
- Loss of Capacity and Loss of Head
- Cavitation
- Worn Components
Objectives:
- Explain how pressure and flow rate are affected by the system in which a pump operates.
- Recognize and discuss causes of symptoms of loss of capacity/loss of head.
- Explain what occurs during cavitation.
- Explain the causes and symptoms of worn components.
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| Prerequisites: A familiarity with troubleshooting procedures as well as the proper use of hand tools and precision measuring instruments is required. |
Topics:
- Main Pump Components
- Preparation for Disassembly
- Disassembly
Objectives:
- Identify main components of a typical end suction pump.
- Explain the function of the components of a typical end suction pump.
- List and demonstrate the preparation for pump disassembly
- Disassemble a typical end suction pump.
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| Prerequisites: Completion of the lesson Disassembly is required. Familiarity with troubleshooting procedures as well as the proper use of hand tools and precision measuring instruments is required. |
Topics:
- Bearing Seat Diameter
- Shaft Runout
- Impeller Inspection
Objectives:
- Inspect the components of a centrifugal pump.
- Measure the bearing seat on the shaft of a centrifugal pump.
- Measure shaft runout.
- Recognize evidence of cavitation on an impeller.
- Explain the importance noting measurements in a maintenance log.
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| Prerequisites:
Completion of the lesson Inspection is required. Familiarity with troubleshooting procedures as well as the proper use of hand tools and precision measuring instruments is required. A familiarity with mechanical seals is recommended. |
Topics:
- Bearings and Shaft
- End Plate
- Impeller Installation
- Impeller Clearance
- Shims
- Bearing Cover
- Mechanical Seals
Objectives:
- Reassemble a typical end suction pump.
- Check impeller clearance.
- Calculate the thickness of shims needed to correct impeller clearance.
- Determine the gasket size needed in the bearing end cap.
- Install a mechanical seal.
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