Piping Materials Engineering and Specification

A: A feels efficient because indices often trump drawings, but flange facing affects gasket stress and leak risk; letting a table override a conflicting GA is how mismatches slip through. B mirrors what people see in tie-in packages, yet it assumes a break that isn't marked, and RF-to-RTJ transitions need explicit spools. D leans on tribal memory from revamps, not on any controlled document; that's how scope creep sneaks in. C forces the issue early: mixed facing across documents is a fabrication stopper in a live plant.

A: A looks schedule-friendly, but hydrotesting the wrong alloy doesn't make it safer; it just hides a spec breach under water. C treats leaks as the trigger, yet wrong material can pass a hydrotest and fail later by corrosion. D borrows from failure analysis practice, but hardness won't tell you if someone slipped in A53 instead of A106. B aligns the checks with risk: confirm material identity before stressing the boundary.

A: A explains early leaks, but repeated retorquing didn't stabilize it; something else is at play. B sounds right for wet gas, yet three months isn't enough to thin a flange face without other symptoms. D fits elbows and reducers, not flat gasket faces at modest velocity. C ties the spec choice to the symptom: RF with soft gaskets in frequent wet-dry cycles loses seal stress fast.

A: A is a classic water worry, but SS304 doesn't lose metal uniformly in this range. C gets mentioned often, yet MIC usually targets carbon steel first. D happens, though supports alone won't crack pipe. B matches the chemistry and temperature; chlorides plus stress make SS304 a bad bet here.