I can recollect one main steam piping analysis for a captive power plant in Jamshedpur,India where just near the steam turbine the analyst used a gap 3-D(XYZ) restraint. When I objected about the constructability & sensitivity of the gaps in NEMA SM-24 conformance result of steam turbine, I was silenced in the name of value addition of chopping up a pair of P22 elbows from an alternative flexible layout without such 3-D(XYZ) restraint.

So, it is easy to know the answer, but selling that is not so easy in a lowest bid EPC market.

regards,
sam