Hazop Guide Words: AS_WELL_AS
HAZOP guide words and deviations — IEC 61882:2016 guide words applied to common process parameters across node types (pipe, vessel, reactor, heat exchanger, pump, compressor, control loop, batch step), with typical causes, consequences, and safeguards
| guide word | deviation key | context | deviation description | likelihood class | node type | process parameter | severity class | typical causes | typical consequences | typical safeguards |
|---|---|---|---|---|---|---|---|---|---|---|
| AS_WELL_AS | composition#compressor#liquid_carryover | liquid_carryover | Liquid carryover into compressor suction (slugging) | unlikely | compressor | composition | catastrophic | Knockout drum failure; high liquid level in suction vessel; temperature drop causing condensation; foaming | Compressor surge; hydraulic damage to internals; valves and pistons cracked; catastrophic compressor failure | Suction drum with reliable level alarm (LAH) and trip (LAHH); coalescing filter; automatic blowdown valve; vibration monitoring |
| AS_WELL_AS | composition#heat_exchanger#tube_leak | tube_leak | Heat exchanger tube-side contamination of shell-side fluid (tube leak) | unlikely | heat_exchanger | composition | catastrophic | Corrosion-induced tube failure; mechanical damage; fatigue cracking; tube pitting; thermal shock | Cross-contamination of process streams; high-pressure fluid entering low-pressure side; toxic/flammable fluid release; corrosion of shell-side | Differential pressure monitoring between shell and tube sides; tube leak detector; periodic hydrotest; eddy current inspection |
| AS_WELL_AS | composition#pipe#general | general | Additional contaminant present in process stream | possible | pipe | composition | moderate | Equipment corrosion products; failed seal or packing; leaking heat exchanger tube; operator error adding wrong chemical; ingress of inhibitor or amine | Off-spec product; catalyst poisoning; corrosion acceleration; plugging; safety hazard (toxic impurity) | Composition analyser; corrosion monitoring; regular equipment inspection; quality check sampling; vendor certification of feed |
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