Pump&turbine - big difference in speeds
Pump&turbine - big difference in speeds
(OP)
Hi guys,
I am trying to design foundation for heavy vibrant machinery using PVAP/SVAP software (I am not sure if anybody outside FLUOR knows this software). Because in software I am using for calculations there is only one place to input one speed I am not sure which one should I check.
Here's some machine properties:
Turbine:
speed 3700rpm, rotating weight is 3.4kN
Pump:
speed 595rpm, rotating weight is 13.7kN
Dynamic forces will be calculated using following formula:
Fdyn=speed*rotating weight/6000. Then I am going to calculate resultant force and its location somewhere in the middle.
Do you have any experience in similar problem. I want to check 4 cases
1-soil 20% stronger and pump speed
2-soil 20% stronger and turbine speed
3,4 similar but with 20% weaker soil.
Any help will be much appreciated.
Thanks a lot in advance for your help.
I am trying to design foundation for heavy vibrant machinery using PVAP/SVAP software (I am not sure if anybody outside FLUOR knows this software). Because in software I am using for calculations there is only one place to input one speed I am not sure which one should I check.
Here's some machine properties:
Turbine:
speed 3700rpm, rotating weight is 3.4kN
Pump:
speed 595rpm, rotating weight is 13.7kN
Dynamic forces will be calculated using following formula:
Fdyn=speed*rotating weight/6000. Then I am going to calculate resultant force and its location somewhere in the middle.
Do you have any experience in similar problem. I want to check 4 cases
1-soil 20% stronger and pump speed
2-soil 20% stronger and turbine speed
3,4 similar but with 20% weaker soil.
Any help will be much appreciated.
Thanks a lot in advance for your help.





RE: Pump&turbine - big difference in speeds
RE: Pump&turbine - big difference in speeds
RE: Pump&turbine - big difference in speeds
RE: Pump&turbine - big difference in speeds
RE: Pump&turbine - big difference in speeds
RE: Pump&turbine - big difference in speeds
Assuming that natural frequency of foundation is constant I have two ratios, one for 595rpm and other for 3700rpm. I am simply not sure if I can check it this way.
RE: Pump&turbine - big difference in speeds
1. Engage a geotech to explore the subgrade.
2. Perform dynamic analysis on the concrete mass includes soil effects.
3. Consider using dampers/isolators/shock obsorbers on the machine(s).
Hope the attached PDF would lead you in right direction.