residual life assessment (rla) based renovation ... - India Core

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5.4.2 FOR LP TURBINE: Removal of existing Liners, Diaphragms & Rotor. Measurement of log dimensions (as per log sheet to be supplied by BHEL, Hardwar), during previous overhaul. Cutting of deflectors / ribs & blanking the space in LP casing due to removal of baumen stage. Modification of structure at the exhaust end of LPC to facilitate installation of liner & guide blade carrier. Installation of water spray system in position. Matching / machining of parting plane and correction, if any. Installation of Liners & Guide Blade Carriers in position. Installation of new Mono-block LP Rotor in position. Measurement of Steam Flowpath and correction, if any. 5.5 PAY BACK PERIOD: Pay back period will be approximately 3 years. International Conference & Exhibition India Thermal Power-4 Page 14 of 22
6.0 BHEL’S PROPOSAL FOR R&M OF 200 / 210 MW STEAM TURBINES (KWU DESIGN): EXISTING DESIGN: Existing 210 MW Steam Turbine (SIEMENS-KWU design ) is fitted with T2 reaction blading. Figure 6 shows its cross section of HP Turbine, IP & LP turbines. The LP Turbine is double flow and is provided with 2X8 stages. It also has T2 reaction blading. For HP Inlet assembly, HP Outer casing has buttress threads of 580x9 and accordingly Breech nuts are provided with matching buttress threads.(Fig.7) The HP Exhaust elbows are provided with Serrated Packing. 6.1 DESIGN CRITERIA The purpose of the proposal for modernization of HP & IP Turbines (Siemens-KWU Design), is to provide a cost effective modifications & upgradation package, to maximize the improvements on HP & IP Turbines’ performance. After renovation & modernization of HP & IP Turbines, by implementation of the proposal, including action taken in accordance to recommendations of RLA Study, by way of rectification / replacements of steam turbine components which are being retained, their service life is expected to be about 30 years. The interval between inspections of inner parts of HP & IP Turbine is 6 years. International Conference & Exhibition India Thermal Power-4 Page 15 of 22
Page 1 and 2: RESIDUAL LIFE ASSESSMENT (RLA) BASE
Page 3 and 4: The components & zones identified a
Page 5 and 6: After thorough cleaning of the roto
Page 7 and 8: Reduction in pressure drops. Reduce
Page 9 and 10: HP CASING LINER ROTOR Fig. 1 : Exi
Page 11 and 12: FIG.3-A: DETAILS OF EXISTING DESIGN
Page 13: Main Steam / HRH Steam Temperature:
Page 17 and 18: CYL PIN BREECH NUT OUTER CASING GUI
Page 19 and 20: 6.4 THERMAL INSULATION: Mineral woo
Page 21 and 22: 6.6 RLA BASED REPAIR / REPLACEMENTS

residual life assessment (rla) based renovation ... - India Core

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