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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!
Pipe Schedule vs Class | Eng-Tips Can somebody please enlighten me on what exactly the differences are between pipe schedule and class? Also, how does that effect the weight of pipe fittings? Is there a way to convert the class of a pipe to schedule for the sake of getting a fittings weight? 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
What is plasticity index? | Eng-Tips Can somebody tell me what this value represents? I know that it is the Liquid Limit minus the Plastic limit But can someone tell me what the significance is? How does plasticity affect, for example, compressibility, compactibility, strength, cohesiveness, etc When and why is high or low
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
How much does vertical load affect the lateral load capacity of piles . . . In general, how much does vertical load (compression or tension) affect the lateral load capacity of piles? It seems like whenever I get the geotechnical engineer to run an L-PILE analysis for me, the vertical load doesn't seem to be that consequential
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