4.0 Case studies on Actuators and valves .pptx
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case studies practically observed during the failures or mal operation of actuators of valves and dampers
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- 1. Case studies A V R N B MANIKYALA RAO
- 2. Case Study 1 100% FCV Stuck up Economizer fly ash hoppers choke Ash accumulation inside the stem Actuation of Torque switch Drum level to low Boiler trip on drum level low low Turbine trip on inlet steam temperature low low
- 3. Case Study 2 •Generator tripped on class A lock out •Generator stator temperature high, Co release actuated •I/M working on Co2 release circuit •Accidental grounding took place on negative terminal •Already ground persisting on positive •Dc earth faults should be cleared as and when noticed
- 4. Case Study 3 •Instrument air leakage from the connection joint of attemperator spray block valve. •Loss of air supply resulted in to full open •Attemperator control valve was passing •The steam temperature came down even though the control valve was close •TG trip on temperature low low
- 5. Case Study 4 • TG trip on loss of excitation •DAVR dual auto channel and one manual channel •Service channel failed Redundant channel tracking is not proper •Bump transfer took place instead of bump less •Excitation could not be maintained
- 6. Case Study 5 •2X80 KVA UPS. •Hot stand by •In service UPS failed •Hot stand by could not come in line •Hot stand by was not taken in line since many days •Its healthiness was not tested
- 7. Case Study 6 •Boiler tripped on drum level low low •BFP tripped on Suction valve not open •House keeping workers are working at the pump and touched the limit switch • Resulted in to total unit tripping •Reliability can be improved by adopting 2 out of 3 logic or taking precautionary measures to avoid accidental touching by barricading the area
- 8. Case Study 7 •Field breaker closing on bypass of speed interlock •By passed during cold checks on excitation system •TG tripped on Over flux protection resulting field breaker open •Never by pass any interlocks •Effects seriously on equipment and personal safety
- 9. Case Study 8 •By pass of furnace pressure high high •With LC guns cut in Boiler is tripping on Furnace pressure high high(75mmhg) •Whenever LC gun Cut in , pressing the Furnace pressure high high protection •After some period of operation observed furnace skin casing damage, resulting in to boiler shut down for long period •Remedial measures protection modification with timer •Introduction of orifice in LC guns
- 10. Case Study 9 •Any Case studies experienced by Participants?
- 11. THANK YOU