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Solar Saturn 10 vibration limit and AD problem Login/Join
 
posted
Hi all,

One of my solar drive generator having high AD vibration around 9mm/s only on vertical. The dominant peak is at the generator speed of 1500rpm.

Would this effect from the misalginment since it is a single shaft turbine generator?

and anybody know what is Solar Saturn 10 casing vibration limit? or just using ISO limit?

Appreciate your comment highly. Thanks
 
Posts: 130 | Location: Asia | Registered: 10 March 2006Reply With QuoteReport This Post
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Hi Vibuser,

You could use 5 mm/s Pk as Warning and 7 mm/s Pk as Danger, on these units. Your baseline data and/or trend would be a better indicator to rely on; if you have these that is.
It would be inappropriate to make a call/ judgement based on a single direction level, especially without even having a look at the spectra. May I suggest you provide more data on both the Turbine and Alternator vibration condition/spectra.

Cheers...Rajan Muthukrishnan
 
Posts: 137 | Location: Mississauga, Ontario | Registered: 20 September 2006Reply With QuoteReport This Post
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Rajsha

thanks for your help

attached hopefully you can see the spectra for AD and alternator vertical only

Word DocG6590.doc (28 Kb, 19 downloads)
 
Posts: 130 | Location: Asia | Registered: 10 March 2006Reply With QuoteReport This Post
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attached is the rest of the vib data

feel free to comments why vertical axis quite high

Excel Spreadsheetg6590.xls (63 Kb, 16 downloads)
 
Posts: 130 | Location: Asia | Registered: 10 March 2006Reply With QuoteReport This Post
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Hi Vibuser,

Seems like you may potentially have lube oil pump/bearing problems at the Accessory Drive. I knew the Solar Centaurs had Accessory Drives but, didn't realize the Saturns had them too; must be a later version. I suggest you take an oil sample and perform both property and wear elements test soonest, if you've not done that already. There's a significant engine lube oil temperature rise on the 23rd of February with a slight lube oil pressure drop; for a slight speed increase.
Check it out let us know.

Cheers...Rajan Muthukrishnan
 
Posts: 137 | Location: Mississauga, Ontario | Registered: 20 September 2006Reply With QuoteReport This Post
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Dear Rajsha,

Thanks for your opinion.

Could you brief me in detail how does the pressure drop and speed increase would affect the AD vibration? I need an explanation so that its easier to understd and to explain back to the site operations.

thanks
 
Posts: 130 | Location: Asia | Registered: 10 March 2006Reply With QuoteReport This Post
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Vibuser,

The differences in operating parameters between the two dates, is an observation that needs further investigation on your part; it may/may not have any correlation to your AD vibration. But for about 360 rpm increase, you are seeing significant rise (54 degC - 136 degC) in engine lube oil temperature with less then 2 psi lube oil pressure drop. Have you identified the components at the AD and their speed...Pls provide this info and a sketch of where on the AD the vibration measurements are taken??

Cheers...Rajan Muthukrishnan
 
Posts: 137 | Location: Mississauga, Ontario | Registered: 20 September 2006Reply With QuoteReport This Post
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