Can Q345R replace 20II?
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This post was last edited by wuqitao0000 on 2017-5-10 17:56; it refers to the boiler header end cover (design pressure)
As specified in note a of Table 1 of the Boiler Code, when used for pressure-bearing components such as boiler drums that are not exposed to radiant heat, there is no limit on the operating pressure; therefore, provided that the header is not exposed to heat and the strength requirements are met, it can be used