Pulsation Dampeners Installation for Centrifugal Pumps

Choosing Shock Stop Bottles, CHECK LIST:- "Water Hammer Alleviator Work Sheet" Meeting the Safe Use Requirements of the EC Pressure Equipment Directive. FOR SHOCK, "WATER" HAMMER, BACKFLOW CAVITY IMPLOSION ETC. IT IS NOT POSSIBLE TO PRESELECT THE SOLUTION.

1. Centrifugal Pump Acoustics
2. Pump Start-Up Surge
3. Shut-Down Back-Flow Bang
4. Rapid Valve Closure Hammer
5. Reasons for Levels of Smoothness

Pulsation Dampener for Centrifugal Pump

Pulsation Dampeners for Centrifugal Pumps

Water Hammer Alleviator Worksheet

Pulsation Dampeners - Centrifugal Pump Acoustics

Pulsation Dampeners for Pump Start-up Surge

Pump Start Up Surge Pulsation Dampeners

"Pump Start-Up Surge"
Acceleration head to overcome the mass in the pipe system after the pump. Please at the least review 17, 6, 7, 10, 11, 15, 16, + 24, & 25. and answer:

1. Nitrogen or air pad pressure in top of tank, bars
2. Positive suction head
3. Negative suction head
4. Diameter of the suction line
5. Pressure losses, filters, etc.
6. How long after pump start does the spill back loop valve close
7. Time taken for pump start
8. Any increase in elevation
9. Any decrease in elevation
10. Average discharge pipe diameter
11. Length of discharge pipe
12. Pressure against which the system is discharging
13. Pipe wall dilatability (wall elasticity kills shock)
14. Liquid compressibility (more system cushioning)
15. Any compatible elastomers
16. Compatible metals
17. Rate of mass transfer kg/sec or SG & GPM
18. Viscosity cP
19. R.P.M.
20. Impeller diameter
21. Metal
22.
23. Minimum design metal temperature – mdmt
24. Design temperature
25. Design pressure
26. Max diameter
27. Max height
28. Connection type

Pulsation Dampeners for Shut-Down Back-Flow Bang

Shut Down Back Flow Bang Pulsation Dampeners

Pump Shut-Down "Back Flow Bang"
The mass and velocity of return, filling the void that was caused by continuing to flow away from the pump after it was stopped. Please at the least review 17, 6, 7, 10, 11, 15, 16, + 24, & 25 and answer:-

1. Nitrogen or air pad pressure in top of tank, bars
2. Positive suction head
Negative suction head
3. The length of the suction line
4. Diameter of the suction line
5. Pressure losses, filters, etc.
6. Time for valve to open after pump is turned off
7. Time taken for pump to spin down
8. Any increase in elevation
9. Any decrease in elevation
10. Average discharge pipe diameter
11. Length of discharge pipe
12. Pressure against which the system is discharging
13. Pipe wall dilatability (wall elasticity kills shock)
14. Liquid compressibility (more system cushioning)
15. Any compatible elastomers
16. Compatible metals
17. Rate of mass transfer when pump ran kg/sec or SG & GPM
18. Viscosity cP
19. R.P.M.
20. Impeller diameter
21. Metal
22.
23. Minimum design metal temperature – mdmt
24. Design temperature
25. Design pressure
26. Max diameter
27. Max height
28. Connection type

Pulsation Dampeners for Rapid Valve Closure Hammer

Rapid Valve Closure Hammer Pulsation Dampeners

Fast Valve Closure - "Valve Slam Hammer"
Deceleration of the mass of liquid in the pipe in a small amount of time. Please at the least review 17, 6, 7, 10, 11, 15, 16, + 24, & 25 and answer:-

1. Nitrogen or air pad pressure in top of tank, bars
2. Positive suction head
Negative suction head
3. The length of the suction line
4. Diameter of the suction line
5. Pressure losses, filters, etc.
6. Time taken for valve closure
7. Time taken for pump to spin down
8. Any increase in elevation
9. Any decrease in elevation
10. Average discharge pipe diameter
11. Length of discharge pipe
12. Pressure against which the system is discharging
13. Pipe wall dilatability (wall elasticity kills shock)
14. Liquid compressibility (more system cushioning)
15. Any compatible elastomers
16. Compatible metals
17. Rate of mass transfer kg/sec or SG & GPM
18. Viscosity cP
19. R.P.M.
20. Impeller diameter
21. Metal
22.
23. Minimum design metal temperature – mdmt
24. Design temperature
25. Design pressure
26. Max diameter
27. Max height
28. Connection type

Reasons for Pulsation Dampeners and Smoothness

Stop Drive belt break-up, keep instant load changes less than 14%.

To stop tooth chatter wear, depending on machine inertia, keeps pressure transients less than 12%.

To Stop premature Lift & "weeping", keep all pressure waves that are sustained for in excess of 40 ms below 9% less than static set pressure.

Prevent bust disk fatigue, by keeping repetitive spikes to less than + / - 4% of steady state pressure.

If in doubt stay below 5psi transient over pressure to stop pipe fatigue

Examples: 25 ft of 1" pipe with a 100 Hz frequency. Keep the shocks below 10 psi 6500 ft of 20" @ 0.5 Hz, keep below 30 psi.

Surge Shock and Pulsation Dampeners

Pulsation dampeners from PulseGuard are designed to address pressure pulsation, which is caused by the resistance of the system to flow. Therefore our pulsation dampeners focus on the system related responsibility and are less related to pump liability.

Suitability for purpose recommendations made on the basis of data & calculations above are with the following normal responsibilities of the parties: System Design, S.D. to consider, Pump Vendor, Bottle Peddler

 

Pressure Pulsation Pulse Signatures



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