Standard Technical Features of BTG System for Supercritical 660 ...

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsvi) The thermal insulation for the turbine casing shall consist of sprayedinsulation produced by projecting specially prepared mineral woolalong with a fine liquid spray. This shall be covered with prefabricated'blanket' type insulation. Voids around the blankets should be avoided.However, unavoidable voids shall be filled with loose mineral wool.18.3.3 Materials of insulationi) InsulationType Type # 1 Type # 2 Type # 3 Type # 4 Type #5Material Lightly Resin Calcium Rock wool Ceramicresin bonded silicate preformedfor spray fibrebondedmineral(rock)woolmineral(rock) woolpre-formedpipesections/pipesections/blocksinsulation blankets/blocksApparentdensityMaterialstandard &testingcodeApplicableservice200-25- 200-250 128 kg/m 3blocks100 kg/m 3 100-150for temp. kg/m 3 kg/m 3 kg/m 360-400 0 Cand150kg/m 3for above400 o C.IS:8183 IS:9842 IS:9428 IS:9742 IS:15402Pipingsystem &equipmentwithoperatingtemp.range of60-650 0 C.Pipingsystem of350 NBand belowwith temp.range of60-400 0 C.Pipingsystem &equipmentwithoperatingtemp. rangeof 400-650 0 C.Steamturbine &valves withoperatingtemp. rangeof 400-650 0 C.Steamturbine,boilersurfaces &valves withoperatingtemp. rangeof 400-650 0 C.ii)Sheathing/ Cladding MaterialSheathing/ cladding material for all insulated surfaces. equipment,piping etc. confirming to ASTM B 209-1060 temper H-14 or IS-737Gr.19000/H2 shall be provided as follows:a) For dia. of insulated surfaces : 0.914 mm (20 SWG)of 450 mm & above and forflat surfacesb) For dia of insulated surfaces : 0.71 mm (22 SWG)less than 450 mm183
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsc) For steam generator : 1.219 mm (18 SWG)outer casingribbed Aluminumd) For ESP : 0.71 mm (22 SWG)ribbed Aluminumiii)Binding and Lacing Wiresa) For temperature upto 400 0 C : 20 SWG galvanised steelb) For temperature above 400 0 C : 20 SWG stainless steeliv)Straps and Bandsa) For temperature upto 400 0 C : Galvanised steelb) For temperature above 400 0 C : Stainless steelBands shall be 20 mm wide and 0.6 mm thick.v) Hexagonal Wire Mesha) Upto 400 0 C : 22 SWG,10 to 13 mm aperturegalvanised steelb) Above 400 0 C : 22 SWG,10 to 13 mm aperturestainless steel18.4 Refractoriesi) The refractory material shall comply with relevant Indian Standards.The refractory selected shall ensure perfect sealing, and shall havegood thermal cycling properties allowing quick start-up/shut down ofsteam generators.ii)The refractory material shall:a) have high bulk density and minimum moisture content.b) be capable of withstanding service temperature of 1700 0 C.c) be resistant to slagging products due to coal, and to impurities ofoil like V 2 O 5, Fe 2 O 3, K 2O etc. and to erosion due to fly ash.d) be chemically inactive towards alkalies, iron, silica etc.e) shall pose no health hazard to working personnel, and shall nothave any explosive properties.f) have sufficient strength to withstand forces generated in boiler,without any rupture or damage.184
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Standard Technical Features of BTG System for Supercritical 660 ...

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