Totally agreed with Danb point of view.

Moreover, even if guiding restraints are not present, but lateral movement is present and no friction-reduction PTFE sliding plates are provided, transversal reinforcing plates/ribs are required, to reduce bending stresses at central-longitudinal rib/plate weld/joint with the wide-clamp wall.

Such transversal reinforcing ribs/plates is often omitted by many standard pipe support drawings for NPS 2" ... 6"(8") range. Actually, in the absence of detailed demonstrating calculations, such reinforcements should miss.

In addition, if vertical forces and corresponding friction forces are deemed as significant, shear lugs are required on longitudinal direction, on the both sides of the clamp, to be welded on pipe wall surface, to avoid clamp-pipe relative slippage.

Regards,