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Posted by Skip on November 11, 2003 at 20:47:10:
Just finished feedwater piping to splice in new economizer for B&W radiant heat steam boiler, everything went well with the welds (A106 GrB 12" heavy wall pipe with "J" bevel prep Tig root using 70s-2 wire, fill and cap with stick 7018A-1)on completion of that job we also re-routed the feedwater re-circ and there were no shots done on this line at all, includind the pipe cap I welded on to the header of the old line, the main feed and re-circ are under 2500psi feedwater pressure!
The pipe was 4" heavy wall A106 GrB same weld procedure and consumables as previous, needless to say (I welded these joints as if they were going to be shot) I was shocked when all they did was mag particle these joints.
This is a power plant boiler (1 of 8) producing 500MW of juice and producing steam at 2500 psi and 1000 deg F superheat.
The power plant is in Canada (Ont) and we use T.S.S.A. specs for our province, it follows the guidelines of ASME but to what extent I'm not sure.
Anyway,what gives?