Thank you for the correction that it is ISO 7919-2, however the question is, is the table given on the attachment Annex A, Table A.1 for relative shaft vibration can use for evaluating limits for 1st or 2nd critical/resonance speed? or there is an specific standard for this? Please help.
My situation: I am evaluating the run-up and run-down of our STG 55 MW 3600 rpm, 1452 rpm crit speed, and i have notice that the vibration amplitude during run-down is beyond during run-up (normally +-10% is acceptable) and concluded by performed analysis that it is due to unbalance, then now i am creating a report but i have no reference standard reference available that the 2nd balance resonance is acceptable or not (143 um p-p is the 2nd balance resonance reading).
On the attach given at Annex A, Table A.1 for relative shaft vibration
thank you and regards,
Quoting "The values given in Tables A.1 and A.2 for shaft relative and absolute vibration, respectively, apply to radial shaft vibration measurements at, or close to, the bearings, when taken under steady-state operating conditions at normal operating speed.
As far as specific standards, as I said earlier the OEM usually has some guidelines, often specific to a given model of machine. Section 126.96.36.199 covers the situation but only in a general sense. Machine behavior can be very much dependent on construction details, hence why I suggest you research the OEM guidelines. Such things are often in the Tech manual.
One last thing, ISO specs are copyrighted material and as such should not be attached to posts except in very limited sections.