Standard Technical Features of BTG System for Supercritical 660 ...
Standard Technical Features of BTG System for Supercritical 660 ... Standard Technical Features of BTG System for Supercritical 660 ...
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsii) Fittingsa) Material for200 NB &aboveb) Material for65 NB to
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsb) Non-IBR piping systems:1. At shop All piping including fabricated piping shall be hydrotested at 1.5 times the design pressure. However,non-destructive testing in lieu of hydro test is alsoacceptable subject to regulation 343 (3) of IBR.2. AftererectionAll piping systems shall be hydro tested at 1.5 timesthe design pressure. However, for such systemswhere it is practically not possible to do hydro tests,the tests as called for in ANSI B31.1& IBR in lieu ofhydro test shall also be acceptable.Notes:1. Material X20 or P91 is applicable for Main Steam and HP Bypass lineupto HPBP valve. However, for pipes sizes 150 NB & below in thesepiping systems, A335 P22 shall also be acceptable.2. Material P22 or P91 are applicable for Hot Reheat, and LP bypass.3. In case design temperature is above 550 0 C and upto 605 0 C, then P91 orequivalent material only shall be applicable (for 1 & 2 above).4. EFW pipes as per ASTM A 691 2-1/4 Cr. Class 22 are acceptable foralloy steel piping of size 550 NB & above if the design pressure anddesign temperature are such that it calls for ASME 300 class or below.5. EFW Pipes as per A 672 Gr. B60, Class 12/22 are acceptable forcarbon steel piping of size 550 NB & above if the design pressure anddesign temperature are such that it calls for ASME 150 class or below.6. The fitting for ASTM A672 piping shall correspond to ASTM A 234with Grade corresponding to the pipe material. Welded constructionfittings are also acceptable with A672 piping. However, allrequirements as per ASME B31.1 including the requirements given inmandatory appendix-D, IBR & respective material code shall be fullycomplied with, in respect of welded fittings.7. Pipe material for CRH piping from HPT exhaust nozzle up to CRHNRV shall be alloy steel to ASTM A335 Gr.P22/ Gr.P11. Fittings shallalso be corresponding to ASTM A 234 Gr. WP22/ Gr.WP11.8. Pipe material for HP Bypass and LP Bypass downstream piping uptothe mixing length as per recommendation of valve manufacturer shallbe of Alloy steel to ASTM A335 P11/ P22. Fittings shall also becorresponding to ASTM A 234 Gr. WP11/ WP22.176
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<strong>Standard</strong> <strong>Technical</strong> <strong>Features</strong> <strong>of</strong> <strong>BTG</strong> <strong>System</strong> <strong>for</strong> <strong>Supercritical</strong> <strong>660</strong>/800 MW Thermal Unitsii) Fittingsa) Material <strong>for</strong>200 NB &aboveb) Material <strong>for</strong>65 NB to
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