ASME Suspends Addenda Service - On November 16, 2009 the ASME Standards and Certification Board of Directors voted to eliminate the addenda service for the ASME Boiler and Pressure Vessel Code. This means that the recently published 2009 Addenda to the 2007 Edition of the boiler and pressure vessel code will be the last. Starting with the 2010 Edition, the boiler and pressure vessel code will be published without addenda on either a two-year or three-year cycle, which is yet to be determined.
Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
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