It is hard to make any suggestions based on the information given.
The vibrations may propagate due to various reasons, and any decision
about mitigation activities should be made after a series of tests
that would include measuring the vibrations at various operating modes
of the compressor.
I would recommend bringing a dynamics professional on site to consult with.
For example, last year we investigated the 300MWt steam turbine
vibrations. The cause was a large horisontal crack in the concrete
foundation bottom below ground level, which was then grouted by
injection.
Do you have any image of the structure to post?
Regards, Alex.
On 4/25/08, Swami Raviraj (Mumbai - Civil) <R.Swami@ticb.com> wrote:
>
>
> In one of the process structure(in petroleum industries ) which is @ 60m high & plan dimensions 34 x 54m at bottom (with offset of 9 x 12m ) & reduced to 22x 20m(at top)
> It's RCC up to first level & steel above it.
> It's already erected at site (Operating condition)
> there is one big compressor at ground level (located at hardly 1 - 1.5m) from main structure.
> Two big pipes are coming from this compressors (900 dia) & entering in main structure at 25m level from ground level
> 3 supports are taken for pipe from main structure at intermediate levels.
>
> when we start this compressor the structure also starts vibrating (& its really much more like earthquake at 25m level)
>
> Now I have to check that why its happening & what are the remedial measures for it.
>
> So I need your suggestions for it
>
>
> Regards,
> Raviraj R. Swami
> Tecnimont ICB,
> Civil Dept.
> Mumbai-400064
>
>
>
>
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--
Alexander Bausk
CAD manager, Structural engineer at
Nuclear Engineering&Research Lab
Dnipropetrovsk, Ukraine
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