WTECH 182 Pump and Pumping Systems
WTECH 182 Pump and Pumping Systems
Assignment #3: Pump Components
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 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:
2 points / Response demonstrates comprehension of material and understanding of concepts by using student's own words.
1 point / Response demonstrates good writing skills including appropriate use of standard English with attention to mechanics, grammar, punctuation and usage.
Text
Arasmith, Skeet. Pumps & Pumping, Eighth Edition. ACR Publications, Inc., 1298 Elm Street SW, Albany, OR 97321, 2000.
Chapter
Lesson 3, "Centrifugal Pump Components."
Study Questions
1. What is the geometric shape of a volute case?
2. How might two-piece end-suction volute case parts be named?
3. What is the purpose of the stuffing box?
4. What are the common materials used to manufacture impellers in the water and wastewater industry?
5. Describe how wear rings improve the efficiency of a pump.
6. Where might wear rings be located?
7. What is the purpose of a lantern ring?
8. What is the purpose of drive shaft bearings?
9. Define each of the following terms:
a. radial loads
b. thrust loads
10. Describe the dynamic loads involved with each of the following:
a. single suction impeller
b. double suction split case pump
c. vertically mounted end suction pump
d. lineshaft turbine
11. Explain what the following terms mean with respect to bearing location:
a. inboard
b. outboard
12. How are thrust bearings differentiated from radial bearings?
13. Name the four components of an anti-friction bearing.
14. Under what conditions might the following types of anti-friction bearings be used?
a. Conrad-type
b. Max-type
c. double row, deep groove
d. single row angular contact
e. double row angular contact
f. pre-loaded
g. self-aligning
h. spherical roller
i. cylindrical roller
j. spherical roller thrust
k. tapered roller
l. needle
15. What is the purpose of bearing shields and seals?
16. What is the purpose of bearing snap rings?
17. What is internal clearance with respect to bearings and why is it important?
18. What is the major cause of bearing failure?
19. List the conditions that affect bearing life expectancy.
20. When are bearing numbers important?
21. What is the purpose of a mechanical seal or packing?
22. How do mechanical seals compare to packing?
23. What two materials make up packing?
24. What are the primary elements of a mechanical seal?
25. What is the function of a packing gland?
26. What is the function of a seal gland?
27. What is the purpose of the shaft?
28. What is the purpose of a shaft sleeve?
29. What materials are used to manufacture shaft sleeves used in the water and wastewater industry?
30. Describe the location and function of a slinger ring.
31. What are the two most important functions of couplings?
32. Define the following terms:
a. angular misalignment
b. parallel misalignment
33. Describe how each of the following types of couplings work:
a. flange
b. split rigid
c. jaws
d. gear
e. chain
f. grid
g. flexible disc
h. flexible diaphragm
i. hydraulic
j. magnetic
34. How is the clearance between the impeller and the pump bowl accomplished in a lineshaft turbine?
35. What is the purpose of a non-reversing ratchet on a lineshaft turbine?
36. Where is the discharge head located on a lineshaft turbine and what is its purpose?
37. Describe the two types of stuffing boxes found on lineshaft turbines.
38. What is the purpose of the pump column on a lineshaft turbine?
39. Describe the part column bearings play in a lineshafat turbine.
40. Describe each of the following parts on a vertical turbine pump:
a. pump bowl assembly
b. impellers
c. suction bell