We have plenty of standard casing size and thickness requirements for bore and jack, but we are installing some steel casing for gravity sewer under creeks, etc. via open cut. The install will be pretty shallow from a few feet of cover to the crown exposed. My question is, what casing thickness do I need for a 42" or 48" steel casing? I don't think we need to pay for the extra thickness we'd need for bore and jack, but what is thick enough for open cut so that the casing is not "flimsy" (sorry for the non-technical jargon). The casing in the open cut is just to protect the PVC pipe.
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