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Dear JTE, Appreciate your prompt reply which is quite helpful. In fact the vendor has submitted FEA and we are evaluating it. I am checking to see if there is any direct reference to such a situation any where in Eng-Tips. Janaki.

We have a case where a vacuum ring got interrupted by a large integral nozzle / boot. Vessel diameter is 17' horizontal. Boot diameter is 8'. This obviously exceeds code allowed interruption. Is there a calculation method available to ensure the adequate moment of inertia provided by nozzle...

If a vacuum stiffener ring is interrupted by a nozzle on a cylindrical portion of vessel, how do we ensure that it has adequate moment of inertia to replace the cut ring? Is this allowed by code? J. R. Polani, Houston.

UCS 66: I think I have answered my own question. Weld PQRs and Production test plates need to be impact tested for MDMTs below -20F for curve C & D materials unless their weld rods are prequalified by impact testimg down to -55F. For MDMTs below -55F, no more exemptions and impact testing is...

My question is whether the code exempts impact testing of weld procedures if the base material is exempt thru -155F by virtue of UCS66.1?

By UCS 66 b 3, impact testing for base material can be exempted or MDMT lowered, based ON Fig 66.1 to -155F. If the base metal is exempt by this or the MDMT lowered by this, does same provision apply to weld procedures, HAZ and pRODUCTION WELDS SAME AS THAT FOR BASE METAL?