Green River Community College
Water Supply and Wastewater Technology Program

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WTECH 182 Pump and Pumping Systems
Assignment #4:  Pump Repair

Instructions
Read the chapter specified in the text listed below, then answer the Study Questions.  You will maximize your learning and score if you answer the Study Questions in your own words.

Submit your answers to the Study Questions according to these guidelines:

• save your assignment as a Microsoft Word document;  
• format your assignment with no spaces between lines and with 1 inch margins on all sides;
• use normal font (no bold, italic or underline, please) Times New Roman (PC) font size 12 or Times (Apple) font size 12;
• place the course number, the title of the assignment and your full name at the beginning of your assignment;
• list Study Question answers by number (it's not necessary to re-write the Study Questions themselves);
• submit the assignment as an e-mail attachment to the instructor at madams@greenriver.edu by the due date/time listed in the course schedule;
• make it clear in your e-mail subject line which course and assignment number you are submitting (for example, your e-mail subject line might read:  WTECH 182 Reading Assignment #1); and
• submit each assignment as a separate e-mail (only one assignment per e-mail, please!).

Evaluation
In order to be accepted for evaluation, this assignment must be submitted by the due date/time listed in the course schedule and in the format outlined in the instructions section above.  The instructor will randomly select study questions from this assignment for evaluation.  Selected study questions will be evaluated based on the following criteria:

Text
Arasmith, Skeet.  Pumps & Pumping, Eighth Edition.  ACR Publications, Inc., 1298 Elm Street SW, Albany, OR 97321, 2000.

Chapter
Lesson 4, "Centrifugal Pump Repair."

Study Questions

1. What type of manufacturer's information is desirable when replacing pump components?
2. Describe preparation steps necessary to remove the volute case on each of the following types of pumps:
   a.  back pull out
   b.  non back pull out
3. Describe the procedure for removing the suction head on a non back pullout pump.
4. Describe the procedure for installation of a suction head.
5. Describe the procedure for separating a volute case from the stuffing box (volute case removal).
6. Summarize techniques that might be used for volute case gasket replacement.
7. Describe the three most common techniques used to hold an impeller in place.
8. Describe techniques used to keep impeller locking nuts/bolts from backing out or vibrating loose.
9. Describe proper puller placement when removing an impeller from a shaft. 
10. Describe how impellers might be damaged when using an impeller puller.
11. Describe the procedure for using an impeller puller.
12. If there is not sufficient space between the impeller and volute case to insert a puller (such as with a non back pull out), how might an impeller be removed?
13. When replacing a worn impeller with a new one, what comparisons (measurements) should be made?
14. Describe the procedure for shaft preparation before replacing an impeller.
15. Describe the three methods used for holding a shaft sleeve onto a shaft.
16. Describe a method for removing a press-fit bronze shaft sleeve.
17. Describe a method for removing a press-fit stainless steel shaft sleeve.
18. Summarize steps that should be included during shaft sleeve installation.
19. How are wear rings held in place?
20. Describe four methods for press fit casing wear ring removal.
21. Describe measurements that should be made with respect to wear ring installation
22. Describe a method for cooling a wear ring.
23. When cooling a wear ring and heating a casing, why is it important to hold the wear ring in place until the temperatures have equilibrated?
24. Summarize important considerations/steps in bearing removal.
25. Summarize important considerations/steps in bearing installation.
26. Define the following terms:
    a.  runout
    b.  end play
27. Describe causes of bent shafts and how shaft damage can be prevented.
28. List the four steps required for coupling maintenance.
29. Describe cleaning procedures for couplings.
30. How can you tell if a metal coupling part has been exposed to excessive heat?
31. Describe the four techniques commonly used for coupling alignment.
32. Describe the five steps of any initial coupling alignment procedure.

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