When to Specify Torsional Analysis for Rotating Equipment
When to Specify Torsional Analysis for Rotating Equipment
(OP)
Hi Everybody,
Requirement of Torsional analysis always confuses me while preparing rotating equipment data sheets (Pumps, Compressors etc.) I would like to know what is the criterion for specifying torsional analysis ?
Is this based on:
1) Break power ?
2) Driving Speed rpm ?
3) Variable speed machines (VFD) etc.?
4) Reciprocating equipment (Recip. compressor / Engine driven) etc.
Is there any Code or standard specifies or gives guideline on torsional analysis requirement. Experts pls help.[/b]
Requirement of Torsional analysis always confuses me while preparing rotating equipment data sheets (Pumps, Compressors etc.) I would like to know what is the criterion for specifying torsional analysis ?
Is this based on:
1) Break power ?
2) Driving Speed rpm ?
3) Variable speed machines (VFD) etc.?
4) Reciprocating equipment (Recip. compressor / Engine driven) etc.
Is there any Code or standard specifies or gives guideline on torsional analysis requirement. Experts pls help.[/b]





RE: When to Specify Torsional Analysis for Rotating Equipment
RE: When to Specify Torsional Analysis for Rotating Equipment
In my opinion, it is always wise to perform a TVC. This is a relatively low cost check, and can help you to avoid many problems.
regards
rob
RE: When to Specify Torsional Analysis for Rotating Equipment
RE: When to Specify Torsional Analysis for Rotating Equipment
RE: When to Specify Torsional Analysis for Rotating Equipment
RE: When to Specify Torsional Analysis for Rotating Equipment
When ever you have variable excitation it is best to have a torsional analysis done.
Variable excitation can come in many forms.
1.) Variable Loads (Stops, Starts, Dwells, Reverses)
2.) Variable Speeds (Transmissions, VFDs)
3.) Operational load excitation (functioning compressor cylinders)
4.) Operational power excitation (functioning cylinders in Engines)
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RE: When to Specify Torsional Analysis for Rotating Equipment
RE: When to Specify Torsional Analysis for Rotating Equipment
Excellent Point ! ! ! When I think about torsional "analysis", it can come in the form of classical software analysis or physical measurement like you mentioned. Either way, "analyze" the system as oppose to just running it.
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