Hazop Node Analysis Worksheet

Use when a process-safety engineer, HAZOP chair, HAZOP scribe, plant process engineer, operations supervisor, instrumentation / controls engineer, or PSM / RMP coordinator at a chemical, refining, oil & gas, LNG, petrochemical, polymer, fine-chemical, pharmaceutical-API, biotech, hydrogen, ammonia, fertiliser, pulp-and-paper, food-and-beverage, water-treatment, semiconductor, or energy facility needs to walk a multidisciplinary team through one node of a Hazard and Operability (HAZOP) study aligned to IEC 61882:2016 and the CCPS Guidelines for Hazard Evaluation Procedures. Guides scoped intake of facility, unit, P&ID set with revision dates, study scope IN / OUT, HAZOP chair / scribe / discipline-representative roster (process, operations, mechanical, instrumentation / controls, electrical, safety, environmental, maintenance), regulatory frame (OSHA PSM 29 CFR 1910.119, EPA RMP 40 CFR 68, Seveso III, MOC trigger, 5-year revalidation), facility risk matrix, and the LOPA-trigger criteria; defines one node at a time (node ID, P&ID reference, line / vessel / equipment bounds, normal and design operating envelope, instrumentation, isolations, utility ties); states the node's design intent (function + target operating envelope) with source-of-truth references; walks the full guideword × parameter matrix — No / Less / More / Reverse / As Well As / Part Of / Other Than against Flow / Pressure / Temperature / Level / Composition / Phase / Reaction / Time / Sequence — recording, for every credible deviation, cause (with the human / equipment / control / external trigger), consequence to people / asset / environment / production / reputation (never collapsed into one), existing safeguards split into prevention and mitigation layers, and severity × likelihood on the facility risk matrix; generates recommendations with action wording, single named owner, target date, recommendation type (design change / procedure / training / IPL / further study), and a LOPA-trigger flag when residual risk exceeds corporate tolerance; produces a DRAFT HAZOP worksheet in the IEC 61882 column layout, a recommendation register, a deviations-not-credible log, a parking-lot list, and a chair / scribe / discipline review-and-sign-off block — for the HAZOP chair and process-safety responsible person's review before any PSSR sign-off, MOC closure, start-up authorisation, or LOPA / SIL study hand-off. Never finalises a PHA, never signs the PSSR, never authorises start-up, never performs LOPA / SIL determination (only flags candidates for it), never performs Quantitative Risk Assessment, never merges prevention and mitigation safeguards, never lowers severity to dismiss a deviation, and never overrides the HAZOP team's or the process-safety responsible person's judgement.

by @archlab-space (devasher)·MIT-0