Several years ago a Mr. Bob Robleto (KBR) presented a paper at the ASME PVP conference on the design, construction and installation of a moment support. I asked Bob about it again yesterday and here's what he said:


The paper is titled “Moment Restraint Support For 84 Inch Conference Compressor Suction Line”, Pressure Vessel Piping Conference, Orlando Florida, 1997

We built one for an 80 inch line in an ethylene plant and it worked fine. The tolereances were important and we had a man go down and inspect the installation. The design comes from A. Kieth Escoe in his book Mechanical Design of Process Systems. On pages 57 and 58 of Volume 1, pictures and an application of an MRS, (Moment Restraint Support) are shown. It constrains the moments but not axial motion.