Build structured HAZOP worksheets per IEC 61882. Define study nodes, apply guide words to process parameters, assess consequences, record safeguards, and generate action items — all in one shareable, printable document.
Click + Add Node to define your first process node (e.g., "Feed line to reactor", "Separator overhead", "Pump P-101 discharge").
Each node gets its own set of deviations.
| Guide Word | Meaning |
|---|---|
| No / None | Complete negation of design intent |
| More | Quantitative increase (flow, temp, pressure…) |
| Less | Quantitative decrease |
| As Well As | Qualitative increase — additional activity/component |
| Part Of | Qualitative decrease — only some of the intent |
| Reverse | Logical opposite of the intent (reverse flow) |
| Other Than | Complete substitution — different material/phase |
| Early | Occurs sooner than intended (relative to time) |
| Late | Occurs later than intended |
| Before | Occurs before in sequence |
| After | Occurs after in sequence |
| Parameter | Common Deviations |
|---|---|
| Flow | No, More, Less, Reverse |
| Temperature | More (high), Less (low) |
| Pressure | More (high), Less (low), No |
| Level | More (high), Less (low), No |
| Composition | As Well As, Part Of, Other Than |
| Phase | Other Than (two-phase, solid) |
| Reaction rate | More (runaway), Less, No reaction |
| Time / Sequence | Early, Late, Before, After, Reverse |
| Agitation / mixing | No, Less, More, Reverse |