Among the sources of nondesign leakage are: For the BB44 design, two values of apparent IP efficiency should be measured. Figure 6 highlights these sources for 75-MW Allis-Chalmers units, of which SCG has three. For Westinghouse (Figure 1) and Allis-Chalmers combined high-pressure/intermediate-pressure (HP-IP) turbines, there are more design (and potential nondesign) leakages to the IP turbine than in General Electric machines. Eventually, the turbine required an inspection to check for wear of its thrust bearing. A broken or cracked bell seal on a BB44 turbine can be diagnosed by trending the difference between the deaerator/boiler feedpump turbine extraction temperature and the LP crossover pipe temperature. Yet another source. (On some units, there is an extraction location on the IP1 exhaust that can be used for pressure/temperature measurements. We’ve got you covered! There’s another good reason to do this: BB44 IP dummy ring bolts broken by the distortion can enter the IP turbine and damage its blading.
If the former is several degrees lower than the latter and the two crossover pipes are at a different temperature, a bell seal or inlet pipe could be cracked.
The apparent values of IP efficiency, which had been high due to the IP dummy leakage, returned to more normal values. Answer: Reaction turbines have axial thrust because pressure on the entering side is greater than pressure on the leaving side of each stage. Courtesy: Southern Company Generation. Outage inspections also revealed that a broken first-stage drain pipe and worn HP dummy seals were contributing to the high leakage. if(MSFPhover) { MSFPnav3n=MSFPpreload("../Power Plant Dictionary/_derived/PowerEngineeringDictionaryTable.htm_cmp_strtedge110_vbtn.gif"); MSFPnav3h=MSFPpreload("../Power Plant Dictionary/_derived/PowerEngineeringDictionaryTable.htm_cmp_strtedge110_vbtn_a.gif"); } The bell seals were in good condition. google_ad_height = 90; To counteract this force, steam is admitted to a dummy (balance) piston chamber at the low-pressure end of the rotor. Use only treated water to avoid shaft pitting. Turbomachinery Magazine brings you the latest and most comprehensive news and perspective in the industry. These blades form a wall of moving nozzles that further expand the steam. // -->.
Without a doubt, the new IP dummy ring had worked as advertised. if(MSFPhover) { MSFPnav5n=MSFPpreload("../_derived/FAQ.htm_cmp_strtedge110_vbtn.gif"); MSFPnav5h=MSFPpreload("../_derived/FAQ.htm_cmp_strtedge110_vbtn_a.gif"); } Including the effect of reduced reheat spray flow, the unit heat rate improvement was about 40 Btu/kWh. Since it is impossible for the IP dummy leakage to be higher than the total leakage, the absolute accuracy of the IP dummy leakage was called into question.
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