More information can be had by searching for "pipe hangers"
The one problem you have to be aware of is not design so much as is erection... For example when running several hundred feet of pipe a double saddle is cumbersome and may get pinched/hung-up at one location whereas single saddles may not...on the other hand single saddles are not confining on the top....
Trade offs, trade offs
Regards,
Qshake
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