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A: A. This would usually affect multiple arms tied to the same header, not just one. C. Cavitation would show pressure and noise fluctuations across the skid, not a single arm bias. D. Density factor errors skew all scales uniformly rather than one position. B. A leaking or worn seat causes early cutoff specific to that filling head.

A: A. Radiant heat still transmits despite fireproofing, so escalation risk remains. C. Inspectability isn't the driver for layout distances in this case. D. Logistics are secondary and not the hazard basis. B. Distance directly limits thermal radiation and missile effects during a BLEVE.

A: A. Setpoint checks assume a healthy signal path that hasn't been proven yet. B. Physical placement matters but doesn't confirm loop integrity. D. Applying gas before electrical checks can mask wiring faults. C. Signal integrity must be proven before functional testing.

A: A. Excess flow valves are intended to close on large flow increases. C. They don't regulate pressure but also don't worsen surge events. D. Closure on high flow is their primary safeguard action. B. Small leaks below trip rate pass through unmitigated.

A: B. Valve hunting affects flow but doesn't usually create thermal lag oscillations. C. A plugged strainer would bias temperature low, not oscillate cyclically. D. Excess steam pressure tends to drive stable higher outlet temperature. A. Condensate backup causes cyclical heat transfer loss and recovery.

A: A. Dry LPG under normal conditions doesn't guarantee free water presence. B. CUI is addressed by coating and inspection, not internal allowance. D. Fabrication tolerances are handled separately in code rules. C. Allowance covers credible off-spec scenarios and long-term degradation.

A: A. Insulation before drying traps moisture and raises corrosion risk. C. PSV setting is a separate calibrated activity. D. Painting doesn't address internal condition. B. Removing residual water prevents internal corrosion and freezing issues.

A: A. Vapor lock isn't driven by the level gauge condition. B. Blockage prevents indication, not filling flow. D. Pump pressure isn't measured through the level gauge. C. Overfill leaves no vapor space, driving pressure rise with heat.

A: A. Vapor lock usually drops amps as load decreases. C. Wear lowers head and amps together. D. Single phasing spikes amps but also causes severe vibration and heat. B. Deadheading raises load and amps while choking flow.