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otating cutter. The thermal- or plasma- arc cut holes, when made, shall be sufficiently smaller gost pdf in diameter than full size, such that subsequent machining to full size shall completely remove all metal whose mechani- cal and metallurgical properties have been affected as a result of the thermal- or plasma-arc cutting. Tube holes may be counterbored where the metal is thicker than that required to get a proper bearing by expanding, so as to form narrow seats into which the tube ends can be properly expanded, provided there is space available to permit a proper amount of fiare of the tube end. The sharp edges of tube holes shall be taken off on both PG-82 HOLES FOR STAYS PG-82.1 Holes for threaded stays shall be drilled full size or punched and subsequently drilled or reamed. Punched holes shall not exceed 1fi4 in. (6 mm) less than full diameter for plates over 5fi16 in. (8 mm) or 1fi8 in. (3.2 mm) less than full diameter for plates not exceeding 5fi16 in. (8 mm) thickness prior to finished drilling or reaming. Threaded holes shall be tapped fair and true with a full thread.
PG-82.2 Holes for welded stays shall be cut and pre- pared in accordance with PW-29. sides of the plate with a file or other tool. PG-80 PERMISSIBLE OUT-OF-ROUNDNESS OF CYLINDRICAL SHELLS PG-80.1 Internal Pressure. Finished cylindrical sec- tions of headers, shells, drums, and similar components shall be circular at any section within a limit of 1% of the mean diameter, based on the differences between the maximum and minimum mean diameters at any section. To determine the difference in diameters, measurements may be made on the inside or the outside, and when the component is made of plates of unequal thicknesses, the measurements shall be corrected for the plate thicknesses as they may apply, to determine the diameters at the asme bpvc section ix middle line of the plate thickness. PG-80.2 External Pressure. Welded cylindrical fur- naces and other cylindrical parts subjected to external pres- sure shall be rolled to practically a true circle with a maximum plus or minus deviation not to exceed the fol- lowing: (a) For components greater than 24 in. (
