The working pressure of cylindrical shells with fursion
welded seams shall be calculated from the following
||(t-2) x S x C
t = thickness of shell plate in thirty-seconds of an
D = internal diameter of shell in inches.
S = Ultimate tensile stress in tons per square inch.
C = 32 for Class I boilers.
C = 27 for Class II boilers.
In no case the thickness of cylindrical shells with
fusion welded seams be less than those given in table
thickness for Fusion Welded Shells
||Internal diameter inches
||Minimum thickness inches
||Up to and including 24
|Over 24 up to and including
In no case shall the factor of safety of the cylindrical
shell and ends be less than 4.