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askaripour
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Join Date: Jan 2010
Posts: 26

Steam Turbine Speed Fluctuation

01/21/2010 11:51 AM

im solo runing a backpressure type steam turbine with 110 barg suply pressure with 5507 RPM min govornor and 8260 RPM max speed.

but it fluctuates at 6200 rpm. ???
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Steam Turbine Speed Fluctuation

01/22/2010 3:22 AM

Well, if 5507 is the min and 8260 is the max, then it's within specification. What's the problem?

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askaripour
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Join Date: Jan 2010
Posts: 26
#2
In reply to #1

Re: Steam Turbine Speed Fluctuation

01/22/2010 5:08 AM

during solo run when speed reaches to 6200 RPM actuator begins to fluctuation and it causes over speed.(I changed its actuator before but the problem didnt solve!)
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otha
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Join Date: Oct 2008
Location: Meherrin Virginia
Posts: 319
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#3

Re: Steam Turbine Speed Fluctuation

01/22/2010 9:15 AM

The only reasonable assumption that can be made about your machine is that it is used in some process application on the steam side, if it is some sort of line drive or pumper it sounds like you are letting the back pressure be the one item that you can control. One set of valves can control one function that is a given in governors.

When this excursion to overspeed occurs what exactly happens? It sounds like your controlling valve is hanging up or one of the hydraulic amplifiers has a rough spot. The one thing to keep in mind when troubleshooting governors is that the problem is usually associated with loose or tight linkages or components. The effect is the same, the system tends to wind up and overshoot, this usually culminates in a hunt, when it is so pronounced that you actually go to overspeed you are usually talking about some thing visually obvious.

A little more detail would help.

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askaripour
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Join Date: Jan 2010
Posts: 26
#4
In reply to #3

Re: Steam Turbine Speed Fluctuation

01/22/2010 9:45 AM

I did solo run again with 60 barg steam supply pressure again and it was successful.
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