A temperature split test indicated that the measured IP efficiency to the LP crossover had decreased 5%, with a significant increase in the LP crossover pressure. The turbine began producing an unusually loud noise following a temperature excursion.

10.

Although the test wells provided by the turbine manufacturer at the IP blading exhaust on the upper and lower (difficult-to-access) shells are in stratified locations, they are still useful for trending.



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Including the effect of reduced reheat spray flow, the unit heat rate improvement was about 40 Btu/kWh. Use predictive techniques to guide your mercury compliance strategy, Application determines DG system configuration, Detecting and solving lube oil varnish problems, PSNH’s Northern Wood Power Project repowers coal-fired plant with new fluidized-bed combustor, Performance Improvements in Fossil Fuel Power Plants with Multivariable Model - Predictive Controls and Artificial Intelligence, Advantages of Ultrasonic Flow Meters in Combined Cycle Power Plants, How Protecting SAIFI Metrics & Customers Improved So Much More. They hold the vane-shaped nozzles and seals between the stages. if(MSFPhover) { MSFPnav7n=MSFPpreload("../_derived/knowledge.htm_cmp_strtedge110_vbtn.gif"); MSFPnav7h=MSFPpreload("../_derived/knowledge.htm_cmp_strtedge110_vbtn_a.gif"); } (parseInt(navigator.appVersion) >= 4 ))); And the effectiveness of the balance drum depends directly on the balance drum seal. Stuffing box using woven or soft packing rings that are compressed with a gland to prevent leakage along the shaft.

On a similar, smaller unit at this plant, the holes in the IP dummy ring were completely welded up in the 2007 outage because a sister unit at another plant did not have the extra cooling holes.
Answer:  In an extraction turbine, steam is withdrawn from one or more stages, at one or more pressures, for heating, plant process, or feedwater heater needs. if(MSFPhover) { MSFPnav4n=MSFPpreload("../FiremanExams/_derived/fireman_exams.htm_cmp_strtedge110_vbtn.gif"); MSFPnav4h=MSFPpreload("../FiremanExams/_derived/fireman_exams.htm_cmp_strtedge110_vbtn_a.gif"); } This is done to oppose axial forces generated by the turbine blades affixed to the rotor shaft. The unit experienced some thrust balance problems after start-up that may have contributed to the higher leakage. What are some conditions that may prevent a turbine from developing full power?

If the suction side of the impellers is opposed, the thrust force will be significantly reduced and can approach zero. Not a subscriber or a registered user yet? Cracked and broken main steam inlet bell seals on a Westinghouse BB44. Knowing the actual direction of the thrust can be very useful during troubleshooting exercises in determining the root cause of thrust position changes. if(MSFPhover) { MSFPnav1n=MSFPpreload("../_derived/home_cmp_strtedge110_vbtn.gif"); MSFPnav1h=MSFPpreload("../_derived/home_cmp_strtedge110_vbtn_a.gif"); } Flow calculations indicated that these holes for cooling steam were the source of the excess IP dummy leakage (a significant 40,000 lb/hr). Checking inlet sleeves for cracks in the trepan radius using the turbine manufacturer’s test method. Pre-outage temperature split testing of this unit in 1992 indicated a very high level of IP dummy leakage (7.6% of hot reheat flow) and similarly high total HP to IP leakage of 7.4% of hot reheat flow (design is 5.4%). The results of temperature split testing were inconclusive due to the swings in leakage. google_ad_client = "ca-pub-0945984148751929";

Outage inspections also revealed that a broken first-stage drain pipe and worn HP dummy seals were contributing to the high leakage. It is between fisrt stage( Impilse stage ) nozzle and balance piston. // -->.

What are topping and superposed turbines? The sources of design leakage to the IP turbine include the IP dummy, the reheat diaphragm packing, and the LP dummy. // -->