3

N = Number of identical pumps

(1) Horizontal pumps only

(2) Vital service pumps are generally unspared, partially spared, or multistage. When a vital machine is down, production loss or violation of environmental permits results.

(3) Essential service pumps are required for operation and have an installed spare. A production loss will occur only if main and spare fail simultaneously.

(4) Cartridge type mechanical seals shall include sleeve and gland.

(5) Cartridge consists of assembled element plus discharge head, seal(s), and bearing housing(s).

(6) Element consists of assembled rotor plus stationary hydraulic parts (diffuser(s) or volute(s)).

(7) Rotor consists of all rotating parts attached to the shaft.

(8) Normal wear parts

Source (Reference 1)

TABLE 2A Check chart for centrifugal pump problems

Symptoms

1. Pump does not deliver liquid

2. Insufficient capacity delivered

3. Insufficient pressure developed

4. Pump loses prime after starting

5. Pump requires excessive power

6. Pump vibrates or is noisy at all flows

7. Pump vibrates or is noisy at low flows

8. Pump vibrates or is noisy at high flows

9. Shaft oscillates axially

10. Impeller vanes are eroded on visible side

11. Impeller vanes are eroded on invisible side

12. Impeller vanes are eroded at discharge near center

13. Impeller vanes are eroded at discharge near shrouds or at shroud/vane fillets

14. Impeller shrouds bowed out or fractured

15. Pump overheats and seizes

16. Internal parts are corroded prematurely

17. Internal clearances wear too rapidly

18. Axially-split casing is cut through wire-drawing

19. Internal stationary joints are cut through wire-drawing

20. Packed box leaks excessively or packing has short life

21. Packed box: sleeve scored

22. Mechanical seal leaks excessively

23. Mechanical seal: damaged faces, sleeve, bellows

24. Bearings have short life

25. Coupling fails

Possible cause of trouble (each number is defined in Table 2B)

1, 2, 3, 5, 10, 12, 13, 14, 16, 21, 22, 25,30,32,38,40

2, 3, 4, 5, 6, 7, 7a, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 31,

4, 6, 7, 7a, 10, 11, 12, 13, 14, 15, 16, 18, 21, 22, 23, 24, 25, 34, 39, 40, 41, 63, 64

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

Get My Free Ebook


Post a comment