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- Effect of Molecular Weight On Compressor Performance
Dear All, I have extensively studying the analysis of the impact of Molecular weight changes on fixed speed and variable speed compressors Can you provide your feedback on the below simplified summary: 1) Fixed Speed Compressor, fixed compression ratio, speed and head at every flow: a) With
- NPSH vs. Pressure | Eng-Tips
Hi all, I am having trouble trying to distinguish the difference between NPSH and pressure I know that NPSHr is what you must have in order for the pump to not cavitate It is equal to: (static height) + (pressure within vessel) - (vapor pressure) - (pipe friction losses) For example
- Torque spec changes from nut to bolt head? | Eng-Tips
In a torque spec for a typical bolt, washer and nut arrangement, is the proper torque value affected whether it is applied to the bolt head as opposed to the nut? Thanks!
- Relationship between axle torque and wheel torque | Eng-Tips
I can see a momentary 'jerk' occuring at the steering wheel (as force is applied through the drive train) that might be caused by an initial difference in axle twist, but I also see the differential almost immediately 'cancelling out' this affect
- VFD and induction motor power factor | Eng-Tips
The difference can depend on the line voltage vs the VFD output voltage If you set the VFD to 460V motor it will output 460V even with a different line voltage (within limits of course) The change in voltage could affect the output current I've seen this mostly be a factor when the motor voltage setting is set too high
- Voltage control MVAr Mode - Generator Parallel Operation
A bit of a sidebar to main topic here but was wondering if anyone had any good reference that summarizes the difference between voltage control and MVAR control modes?
- Please help clarify datum shift vs bonus tolerance | Eng-Tips
Then the datum shift is the difference between the actual size and the virtual condition size developed by the refinement tolerance If the same hole was a tertiary, the the shift is the difference between the actual size and the virtual condition size developed through the positional tolerance rather than the refinement
- Internal wind pressure | Eng-Tips
So when you get a net difference between a set internal pressure and a different exterior pressure, you get a net pressure applied to the walls of the box This is not necessarily the full internal pressure effect used in ASCE 7
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