Basics of Piping Engineering/Plant layout

A: Option A would under-stress the pipe seam and miss through-wall defects; option B would decouple field integrity from code intent and accumulated thinning; option C would function as a leak check only and not a strength test; option D applies the piping safety philosophy that the test exceed service stress to expose latent defects.

A: Option A describes a time-to-failure issue rather than a protection gap; option B addresses a mechanical integrity mechanism unrelated to fire; option C is a materials degradation mode not affected by fireproofing; option D reflects that passive fireproofing is ineffective against focused jet flames on uncoated attachments.

A: Option A mixes absolute and gauge bases and lands on the right number for the wrong reason; option B increases allowable pressure as temperature rises, reversing material behavior; option C double-counts conservatism by derating the wrong pressure basis; option D correctly applies the temperature factor to the gauge MAWP.

A: Option A would change stress but not create directional bowing; option B would give transient loads tied to flow rather than steady displacement; option C would bias stress but still allow movement; option D explains restrained expansion, rising anchor loads, and visible bowing.