Vibration Catalogue - Iotech

Catalogue Vibration Catalogue

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lOtech Product Application using the ZonicBook

Turbine generator Balance Testing

Application Summary

Leading universities, hospitals, and certain ing their own boiler houses and power plants

electricity. I he turbines typically develop from

acquisition speed and accuracy, portability, and durability, ils memory musi lie lar¡;e enough le store hours of cumin in ms d.il.i giilhered Horn

bearingspecificarkin. I Jisplaccmentsexceeding 50%of the bearing clearance, however, can iead

Vibration analysts typically connect the

probes thatarc permaiierillynioi.iiiie' I mcNeiils' machines. Because they are of various brands and operating specifications, the ZonicBook input can be adapted and calibrated to each sensor in the field under software control. Some older turbines do not have permanently installed proximity probes or seismic sensors, but have what's tailed "shaft riders," spring-

these conditions, the analyst

lOtech's Solution

A vibration consultant with m; Ineasuri'merit and analysis cxperic

m the si

nsthosi

sign.ii. lulu hi. /inik Hook. The eZ-Analyst software that works with the ZonicBook has the capahility of digital recording and playback, which lets the analyst

ranges, and other parameters to suit his specific needs after acquiring the data. Moreover, the

data lor two days at a time using eZ-TOMAS before tile analyst attempts to balance a rotor.

M so, tuibihes f requerí

ously employed included digital tape industrial recorders, Integrating power supplies, racks, and a stash of

heavy to conveniently carry around anions the different installations.

racy, resolution, and frequency range needed for analysis. The lOtech system lets analysts identify critical frequencies and measure shaft eccentricity in terms of velocity to as little as one inch per second. Allowable displacements are

wear and can cause components to rul).

Potential Solution

lliagnosis combines skills in acquiring eiilie.il dal.iari.ianahvini;! hem. hill mia-vsis isunlv 10:., of the job. Acuuiringr he right data consumes the remaining Sir*, The instrumentation required

nay hnd

ie parti

ir file i

In another example, an analyst recorded two

vil nations ivercsu muled li igether, and the result is the absolute vibration, with a displacement close to 10 mils |pk-pk). Consider that the ro-

at 1S0O rpm. The force equals the mass of the rotating element multiplied by the eccentricity, or half the unbalance, and the square of the angular velocity. These parameters determine the force. Using the radius and the 5 mils (pkl, (Hall the absolute vibration mentioned above), theforec is calculated to be lu.OOOIb. From this, veighl that had to be added was calculated.

Conclusion

The bearings were tm|>ected. ar

le packing

and turbine. The most likely condition is oil whip, which caused the rub when the vibration

i nb. i.i rd heaiing insi.ibiliiv ajipe.i is to have been caused by the compressor manufacturer bearing damage. The instability occurred after the bearing failure and was apparently mitigated after the beating repai 1. The two probl e ras were corrected a nd the machine ran smoothly.

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