| http://www.w3.org/ns/prov#value | - The following is an attempt to show how the span tables might have been generated:Select a low allowable stress value, e.g., 1,500 psi (Sall(weight)/i), for the combined bending and shear value, such that a sufficient factor of safety is provided, and allowing the standard span chart to be applied to a wide range of piping systems:Beginning with the generalized primary stress equation,PD/4t + iM/Z
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