HAZOP Guideword Deviations (PlantUML Mindmap)
Guideword-by-guideword deviations for a continuous stirred tank reactor feed node, the way a HAZOP team works through it.
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@startmindmap
title HAZOP guideword deviations - reactor R-201 feed node
* R-201 feed line
** No
*** No flow - feed pump trip, catalyst starvation, runaway on restart
*** No cooling - jacket isolation valve left shut after maintenance
** More
*** More flow - control valve fails open, level reaches high-high trip
*** More temperature - cooling water fouled, exotherm not removed
*** More pressure - vent line blocked, relief lifts to flare
** Less
*** Less flow - suction strainer blinded upstream
*** Less level - vortexing and pump cavitation
** Reverse
*** Reverse flow - backflow into the feed drum on pump trip
** As well as
*** Water carryover from the wash column into the feed
** Part of
*** Off-specification composition from the blending header
** Other than
*** Wrong grade delivered to the day tank
@endmindmap