Hazop Guide Words: AFTER
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| AFTER | sequence#batch_step#general | general | Step performed after it should have been in batch sequence | possible | batch_step | sequence | moderate | Operator sequence error; interlock failure allowing step skip; BMS logic error; equipment unavailability forcing step deferral | Extended residence time causing degradation; product contamination from delayed addition; temperature excursion; off-spec batch | BMS step completion interlocks; alarm on step sequence deviation; batch record review; abort criteria defined in batch recipe |
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