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  1. YANGzhou01

    Welding between SA335 P11 piping and 12Cr1MoV piping

    We're encounting a Mat'l difference in welding: The main steam outlet header of our CFB is specified as SA335 P11, but our client's piping Mat'l is 12Cr1MoV. Can someone advise what kind of solution to this tough nut? either advice of WPS or any transition method is welcome. Thanks.
  2. YANGzhou01

    How to read Alloy steel Grade No in Mandatory Appendix A of ASME B31.1

    I'm reading A213 T91 and A335 P91 in Table A-2 "MANDATORY APPENDIX A", Pg #110 of ASME B31.1-2004. They look to me the same. So, what's the difference between T91 and P91? Also, how to interprete those alphas in A359 FP12, A213 TP304, A217 WC1,A451 CPF8M etc. in Table A-3? I mean what "FP"...
  3. YANGzhou01

    AGFA-GEVARET Film substitution for Kodak/Dupont/Ansco

    We specified "Kodak type AA or M and Dupont type 510 or 506, and Ansco A or B" as radiographic films for radio exam. The vendor proposed using "AGFA-GEVARET, Model TESTIX C7 NEW FW". Please give us a tip if there is any difference. Thanks.
  4. YANGzhou01

    Performance difference between RA253MA and 253MA

    I specified "RA253MA" as the Mat'l of CFB Vortex Finder, but the bidder proposed changing to "253MA". Can anybody tell me if there is a big deal if RA253MA is replaced with 253MA? Thanks.
  5. YANGzhou01

    Downcomer Piping Sourcing and Holding for Witness

    Can you guys give some hints on following Qs in regard to CFB Downcomer Piping Sourcing and Holding for Witness? Q1: We're sourcing Downcomer piping for two CFBs: 1) 56T (169m 558mm OD x 25.02MW) SEAMLESS Carbon SA106C, random length; 2) 53T (195m 457mm x 25.7MW)SEAMLESS Carbon SA106C, random...
  6. YANGzhou01

    CFB safety & control valve selection

    Q1--Safety valve: Known data: design pressure/temperature, operating pressure, main steam flow, valve type, size, Mat'l. Do I have to produce "relieving capacity" to vendor to complete the specification? Q2--control valve: Know data: design/operating pressure and temperature, pressure drop, max...

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