Hazard & Operability Studies (HAZOP)

Hazard and Operability Study (HAZOP)

A HAZOP, or Hazard and Operability Study, is a structured and systematic technique used to identify potential hazards and operational issues in process systems—commonly used in chemical, oil & gas, pharmaceutical, and energy industries.
The main goal of HAZOP is to:
  • Identify hazards that could lead to accidents or unsafe conditions.
  • Detect operability problems that could hinder efficient or reliable plant operation.
  • Evaluate existing safeguards and recommend additional risk-reduction measures.
  • Our experienced engineers at Belmont Scientific combine deep technical expertise with industry best practices to ensure that every deviation is carefully analyzed, documented, and mitigated.
    Our HAZOP services typically include:
  • Preliminary Review – Collecting P&IDs, PFDs, and design documentation to define nodes and boundaries.
  • Team Facilitation – Conducting guided HAZOP sessions with a multidisciplinary team including process, operations, instrumentation, and safety experts.
  • Deviation Analysis – Applying guide words to evaluate process deviations, their causes, and potential consequences.
  • Safeguard Evaluation – Assessing the effectiveness of existing protective systems such as alarms, interlocks, relief devices, and procedures.
  • Action and Documentation – Generating a detailed HAZOP worksheet and final report summarizing findings, recommendations, and responsibilities.
  • Frequently Asked Questions (FAQ)

    HAZOP is conducted by a multidisciplinary team (process, operations, safety, instrumentation, etc.) using a systematic node-by-node approach.
  • Divide the process into nodes (sections with defined parameters—pressure, temperature, flow, etc.).
  • Apply guide words (e.g., No, More, Less, Reverse, Other than, As well as) to process parameters.
  • Identify deviations from design intent (e.g., No flow, High pressure, Low temperature).
  • Determine causes (equipment failure, human error, control system malfunction, etc.).
  • Assess consequences (fire, explosion, toxic release, product loss, off-spec product).
  • Evaluate safeguards (alarms, interlocks, relief devices, procedures).
  • Recommend actions to mitigate risk or improve operability.
  • During design phase (to catch issues before construction)
  • After modifications (Management of Change, MOC)
  • Periodically for existing plants (revalidation, typically every 5 years in OSHA PSM-covered facilities)
  • A multidisciplinary team including process engineers, operations staff, instrumentation specialists, and safety professionals should participate.
    Scroll to Top