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 ...
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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 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 <strong>of</strong> hydro test is alsoacceptable subject to regulation 343 (3) <strong>of</strong> IBR.2. AftererectionAll piping systems shall be hydro tested at 1.5 timesthe design pressure. However, <strong>for</strong> such systemswhere it is practically not possible to do hydro tests,the tests as called <strong>for</strong> in ANSI B31.1& IBR in lieu <strong>of</strong>hydro test shall also be acceptable.Notes:1. Material X20 or P91 is applicable <strong>for</strong> Main Steam and HP Bypass lineupto HPBP valve. However, <strong>for</strong> pipes sizes 150 NB & below in thesepiping systems, A335 P22 shall also be acceptable.2. Material P22 or P91 are applicable <strong>for</strong> 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 (<strong>for</strong> 1 & 2 above).4. EFW pipes as per ASTM A 691 2-1/4 Cr. Class 22 are acceptable <strong>for</strong>alloy steel piping <strong>of</strong> size 550 NB & above if the design pressure anddesign temperature are such that it calls <strong>for</strong> ASME 300 class or below.5. EFW Pipes as per A 672 Gr. B60, Class 12/22 are acceptable <strong>for</strong>carbon steel piping <strong>of</strong> size 550 NB & above if the design pressure anddesign temperature are such that it calls <strong>for</strong> ASME 150 class or below.6. The fitting <strong>for</strong> 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 <strong>of</strong> welded fittings.7. Pipe material <strong>for</strong> 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 <strong>for</strong> HP Bypass and LP Bypass downstream piping uptothe mixing length as per recommendation <strong>of</strong> valve manufacturer shallbe <strong>of</strong> Alloy steel to ASTM A335 P11/ P22. Fittings shall also becorresponding to ASTM A 234 Gr. WP11/ WP22.176
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