Steam Turbine - Vibration Probes

Manufacturer?

Manufacturer's telephone number?

So is the problem with the vibration probes - or the steam turbine itself?

The steam turbines I am familiar with (350 MW + -) were securly mounted to a floating slab of reinforced concrete about 7 feet thick. The generator was floated on a fixed slab, set on shims for alignment, but with wide clearance in the mounting holes, and the nuts backed off .016 inch. after torquing to 180 ft/lbs.. The coupling studs were heat torqued and the generator was allowed to find its own 'groove', after 24 hours on turning gear to straiten out the sag before spin up in a 180 ton armature.

No vibration to speak of, but a lot of noise. Hope this helps.

Carl

.......and we are debating whether to allow guests to post. If one spends long enough trying to translate this question into some sort of intelligible language one would then still not bother answering it.

The original poster could possibly "please explain" ---- how to fix ? what is the torque? what is the setting voltage? if differs what happens ?

This being an engineering site , it is expected that persons posting will possess some minimal technical aptitude to intelligently frame a question.

I am aware that some posters may be lay persons , but it really is annoying to have to interpret questions like the one in the origin of this post.

bheemsen,

If you are experiencing vibration alarms/faults/trips on a steam turbine, they very well may be valid. Adequate knowledge and experience of the turbine mechanical limits and running characteristics is required before attempting to adjust/calibrate the vibration sensors.

Also; if the vibration sensors or any part of the system main control has been changed or adjusted, turbine vibration readings should be taken with a "stand-alone" certified machine by a competent person at the turbine manufacturer's required locations to verify direction, magnitude, and frequency.

The vibration monitoring and protection is critical. You must contact the turbine manufacturer and the vibration monitoring system manufacturer for the correct settings for your application.

BE CAREFUL! Changing the (+) - (-) voltage settings drastically changes the operating protection parameters/characteristics (trip setpoints, excitation/sensitivity, vector direction, etc) and the results can be catastrophic as well as deadly.

After personally observing the aftermath and human carnage as a result of a small 15 megawatt steam turbine rupture due to overspeed and vibration, it is someting that I do not ever want to witness again.

If you are just asking for learning information about vibration detection and protection, there are several websites sponsored by vendors such as PMC BETA, Bently Nevada, and others that provide a good deal of information. Google the topic and view the results for yourself.