Hazop Guide Words: PART_OF
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| PART_OF | composition#pipe#general | general | Missing component in process stream | possible | pipe | composition | moderate | Incorrect feed composition; supplier change; incomplete charging of reactants; segregation; phase separation | Incomplete reaction; product off-spec; incorrect stoichiometry; catalyst deactivation | Feed composition analyser; ratio controller; batch charge verification; raw material certification |
| PART_OF | flow#pipe#general | general | Only part of intended flow composition is present | unlikely | pipe | flow | moderate | Phase separation upstream; feed composition change; stratified flow regime; incomplete mixing | Off-spec product; inadequate reaction conversion; incorrect dosing; equipment damage from lean mixture | Composition analyser; density/viscosity meter; mixing verification; flow ratio controller |
| PART_OF | sequence#batch_step#general | general | Partial completion of batch step — step stopped partway through | possible | batch_step | sequence | moderate | Instrument failure during step; equipment failure; utility loss during charging; operator interruption | Incomplete addition; incorrect stoichiometry; partial mixing; unstable intermediate accumulation; product off-spec | Batch recipe with completion interlocks (quantity confirmation, time confirmation); alarm on partial step completion; restart procedure for interrupted batches |
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