neqsim-hazid-fmea-eta-fta

NeqSim HAZID / FMEA / ETA / FTA Skill

The four canonical hazard-identification and scenario-development techniques in one place — used together they produce auditable HAZOP / SIL / QRA documentation per IEC 61882, IEC 61508/61511, ISO 17776 and the CCPS guideline series.

When to Use

• HAZOP node walkdown — apply guidewords to design intent at every node
• FMEA / FMECA — equipment-level failure-mode tabulation with RPN scoring
• Event-tree analysis (ETA) — outcome-frequency development from initiating event
• Fault-tree analysis (FTA) — top-event decomposition, minimal cut sets, β-factor CCF
• Escalation / domino analysis — graph of adjacency between fire/explosion sources

Pairs with neqsim-process-safety (LOPA / SIL / risk matrix) and neqsim-consequence-analysis (probit / IRPA roll-up).

Standards

• IEC 61882 — HAZOP studies — application guide
• IEC 60812 — FMEA / FMECA procedure
• IEC 61025 — fault tree analysis
• IEC 61508 / 61511 — β-factor common-cause modelling
• CCPS Guidelines for Hazard Evaluation Procedures (3rd ed.)
• ISO 17776 — major-accident hazard management

Method 1 — HAZOP Worksheet

import neqsim.process.safety.hazid.HAZOPTemplate;

HAZOPTemplate ws = new HAZOPTemplate("V-100", "HP separator pressure control node");
ws.addDeviation(HAZOPTemplate.GuideWord.MORE, HAZOPTemplate.Parameter.PRESSURE,
    "PCV stuck open",
    "Vessel rupture, gas release",
  "PSV-101; Operator response",
  "Verify PSV sizing per API 521");
String report = ws.report();

The seven IEC 61882 guidewords are defined in HAZOPTemplate.GuideWord. Use addDeviation(...) once per (guideWord, parameter) deviation per node, or generateGrid(...) to create empty rows for selected parameters.

For STID/P&ID + plant-data + NeqSim simulation workflows, use MCP runHAZOP. It accepts a standard runProcess JSON definition plus extracted nodes, safeguards, evidence references, failure modes, and an optional barrier register. It returns HAZOP rows with scenario-simulation evidence and report markdown.