Quite a few years ago I demystified the trapeze hanger rules for myself similar to putting gravity back in to sprinkler calcs. It turns out that section modulus=moment divided by stress. I put it on a spread sheet. The only 'leap' from straight out of 13 it makes is from 15' between hangers to any other distance, and for pipe trapeze member it is not limited to Sch 10 or Sch 40. It is usually not a big deal but say you have 24' bays so 12' of pipe instead of 15'--- you might be able to get rid of the angle iron that has been sitting in your shop for years. If you have a skeptical AHJ, any structural engineer could say "'if per 13, x section modulus is required for 15', then for 12', y section modulus is required". (Ron, instead of the fat guy I used a 100 pound fitter with 150 pounds of meth in her tool belt). It is ugly and user serious instead of friendly, but if anyone wants it, just ask--- it has been years since my last atta-boy.
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