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
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!
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
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
Seismic load, horizontal and vertical | Eng-Tips When you say "p" do you mean rho? Ev is not a resultant vertical reaction, it is a separate force in addition to any vertical reactions In software, it is common to include load combinations with (1 2+0 2Sds)D and (0 9-0 2Sds)D with seismic combinations with ELF to account for vertical seismic force I don't know why it isn't included in many examples Do these examples use full load
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
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
Mode Shapes and Mass Participation | Eng-Tips Simply put, a mode with a larger mass participation means that the mode (usually) has a larger effect on the dynamic behavior of the structure Something I don't understand is, in analyses I've seen so far, you want to increase the number of modes examined to ensure that you capture at least 90% of mass participation
Specific heat ratio in gas compression | Eng-Tips In gas compressor; what is the specific heat ration? How could it affect the compressor performance? in compressor's data sheet; I can see Cp Cv varying with the temperature is this the only parameter which could affect it? thanks
Threadlock and torque specs | Eng-Tips There are some gasket sealers that work good to inhibit moisture or other fluids from entering the threads of threaded fasteners With the torque turn method you mention, the lube on the threads does affect the initial pre torque What size are the threads and what is the initial torque?