Sect. VIII, Appx 13-14 (External P)

[BigTank]

The subject section states 'Rectangular cross-section vessels per Fig. 12-2(a) sketches (1) and (2) subject to external pressure shall meet the following requirements:'...

Could one interpret this to cover stayed vessels of rectangular cross section (sketches (7)-(10))as well, perhaps substituting the longest span dimension(s) as appropriate?

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Fitter, happier, more productive

 

[gr2vessels]

Your interpretation is correct, using the longest span between the stays.
Cheers,
gr2vessels