Failure Analysis

A: This leads to minor disagreement alarms that distract operators but still preserve independent sensing paths; This treats SIL independence as a paperwork exercise and ignores common cause failure through shared hardware; This focuses on dynamic performance and misses the loss of redundancy under faulted conditions; This correctly identifies a common cause failure where one physical fault removes both level signals.

A: This is handled because pressure rises quickly and trips before structural limits are crossed; This confuses integrity protection with reliability degradation mechanisms; This describes an operational impact rather than a hazard escalation; This captures a fast thermal and mechanical failure mode that occurs without exceeding the pressure trip.

A: This ignores hydrogen-assisted cracking that is not tied to gross yielding; This treats corrosion rate as the driver and misses environmentally assisted cracking; This worsens cracking risk by increasing hardness and hydrogen uptake; This aligns hardness with sour service limits to cut SSC initiation risk.

A: This downplays that CA is subtracted from pressure design thickness, not just weight; This is a commercial issue and doesn't address degradation assessment; This misattributes CA to welding variables rather than design assumptions; This identifies the risk of inspectors assuming more corrosion margin than actually exists.