Compressive Stress Welds. For welds subject
to compressive stress only and specifically indicated
as such on the design drawings, the greatest dimension of
porosity or a fusion-type discontinuity that is 1/8 in.
(3 mm) or larger in greatest dimension shall not exceed
the size, B, nor shall the space between adjacent discontinuities
be less than the minimum clearance allowed, C,
indicated by Figure 6.5 for the size of discontinuity
under examination.