not less than one-half the outside circumference
of the vessel for rings on the outside; and
(2) not less than one-third the circumference of the
vessel for rings on the inside.
(d) A continuous full penetration weld is permitted as
shown in sketch (e) of Fig. UG-30. Continuous fillet welding
or brazing on one side of the stiffener with intermittent
welding or brazing on the other side is permitted for
sketches (a), (b), (c), and (d) of Fig. UG-30 when the
thickness tw of the outstanding stiffening element [sketches
(a) and (c)] or width w of the stiffening element mating
to the shell [sketches (b) and (d)] is not more than 1 in.
(25 mm). The weld segments shall be not less than 2 in.
(50 mm) long and shall have a maximum clear spacing
between toes of adjacent weld segments of 24t.
(e) Strength of Attachment Welds. Stiffening ring attachment
welds shall be sized to resist the full radial pressure