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
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
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
Motor Starting Power amp; Power Factor | Eng-Tips The starting power factor has nothing to do with with running load kW 0 36 sounds a little high, but the difference between assuming 0 2 and 0 36 should not be too significant You need to pick a NEMA starting code in the softwware that matches the actual starting current data for your motor
Virtual condition | Eng-Tips This nameless boundary limits the variation of the surface of the hole relative to datums A and B and the unused (in a feature control frame) datum D, by different bounding sizes in different directions (because of the difference between position X tolerance in the direction normal to B and Y tolerance affecting the hole location in the
Bellows design PSVs selection | Eng-Tips You need to understand the difference between 'built up' and 'superimposed' back pressures Built up back pressure develops from the point of initial PRV opening - in these cases, where there is no other back pressure specified, you are permitted to use a conventional design spring operated pressure relief valve up to a maximum built up back
Motor and ESC Theory - Current Draw | Eng-Tips The difference between a DC motor and a DC generator is just a few RPM or a few Volts Imagine your motor is hooked up to a dyno which has the ability to over drive the motor The motor is generating almost as much voltage as is applied to it When the motor is running on the dyno at no load the current will be small