Steam Turbine Bearings

[NightME]

In our coal-fired power plants we have several steam turbine generators that we are going to add sprinkler protection to all the bearings in accordance with NFPA 850 (2010). These sprinklers will be supplied by a preaction valve which will only be opened when either a pull station or the heat detector is activated.

My question is, Does anyone have experience with heat detection on steam turbine bearings and what is the best approach to heat detection, spot or linear?

Since we are going to be constructing a small frame to support the new sprinklers, my thought is that we can route the linear heat detector on the piping and the stands for detection. If we go with spot detection I would need to build some type of heat collector that may or may not work in order to "catch" enough heat to activate the detector. I know FM has a datasheet on this topic, but was hoping for some more real-world thoughts or experience.

Thanks.

 

[cdafd]

Not an expert , but a previous thread

http://www.eng-tips.com/viewthread.cfm?qid=372983

 

[LCREP]

Night,

I have run into both types, the fixed temp heat device will be cheaper. The control panel and wire will be more $$$.

Where are you placing the pull station? You may want to consider the pull station in the control room and in the area of the turbines. Also place the deluge valve out of harms way so if the electronic manual pull station fails you can get to the deluge valve and the manual pull station on the deluge valve. The mistake I see is the deluge valve is placed as close to the hazard as possible to save on pipe. But should the system need to be used no one can get to the manual release on the valve because it is too close to the hazard.

 

[harishchopr]

Refer FM-Data sheet 7-101..

It will give more detail about this topic..
I personally had designed Turbine bearing fire protection for Steam turbine for a power plant in Vietnam