Diverter valves in turbine-heat recovery applications
Diverter valves in turbine-heat recovery applications
(OP)
Does anyone have experience of diverter valve failures when you have a frame 9 turbine combined with an HRSG? I have heard many stories but need confirmation of the cause of failure.





RE: Diverter valves in turbine-heat recovery applications
Patricia Lougheed
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RE: Diverter valves in turbine-heat recovery applications
athomas236
RE: Diverter valves in turbine-heat recovery applications
RE: Diverter valves in turbine-heat recovery applications
note this website:
http://
there is another mfg listed there (1st letter of mfg is 2nd letter of alphabet) that may be of assistance.
good luck!
-pmover
RE: Diverter valves in turbine-heat recovery applications
They are all basically the same inside, ie cold casing and ss lined. quality of the liner installation is important. The valve is also where the opening is for the purge air fan (duct fired HRSG). The door is a knife gate type valve with air seals. The seals need repair but this is infrequent. The valve is sealed in the open and shut position with 2 rows of ss flaps on the valve plate and casing. The two rows form a void which is pressurised with air (at low pressure but higher than the air flue as in the HRSG). This ensures no loss of flue gas up the stack. These ss flaps need repair at every opportunity we get as the bend/buckle or make contact with teh side wall liner plate pins when valve opens/shuts.
The greatest problem is the valve bouncing in the combined cycle position. This takes it off the closed limit and trips the GT. This has happened perhaps 4 times in 9 years.