Process and mechanical · SERNEM

Process Line Breaking Method Statement Example

Before loosening a flange or blind, agree verified work boundaries, isolations and release-of-energy checks with the operating authority.

Illustrative work method — not a permitVerify site permits, risk assessments, approved procedures, competent engineering, equipment instructions and local laws separately. This page does not define test pressures, torque values, anchor ratings or work authorization.

Work sequence, hazards and safeguards

Illustrative sequence only: adapt to the approved job pack and site conditions.

  1. 1

    Verify line identity and scope

    Hazard
    Wrong line, unknown substance or unrecorded change
    Safeguard
    Cross-check approved P&IDs and physical tags; obtain operations approval of the exact work boundary.
  2. 2

    Complete isolation and substance controls

    Hazard
    Residual pressure, backfeed, hazardous liquid or gas
    Safeguard
    Have authorized personnel verify the approved isolation plan, lockout and applicable draining or cleaning evidence.
  3. 3

    Prepare the controlled work area

    Hazard
    Spray, spill, ignition and bystander exposure
    Safeguard
    Set up suitable containment, PPE, controlled exclusion and emergency arrangements.
  4. 4

    Open connection under approved procedure

    Hazard
    Unexpected release and mechanical movement
    Safeguard
    Under competent supervision use only the equipment-specific approved opening method; stop on unexpected conditions.
  5. 5

    Verify reinstatement and handback

    Hazard
    Incomplete sealing, unresolved isolation records, unsafe restart
    Safeguard
    Record joint inspection, required tests, permit closure and controlled operations handback.

Three critical pre-start verification points

  • P&ID, line tag and process contents match
  • Isolation and zero-energy evidence verified by an authorized person
  • Containment, exposure and emergency arrangements are ready

Stop-work triggers

Stop for unexpected pressure or substance, uncertain isolation, a gas alarm, altered permits or uncontrolled access.

Frequently asked questions

Is loosening a flange a valid zero-energy test?

No. Safe isolation and absence of pressure require a planned, approved verification before opening.

Which permits are needed?

Permit categories depend on the site system, process hazards and interacting work.

Official technical sources

These sources have jurisdiction-specific scope; verify local legal and engineering requirements.

Prepare your own document

Open the existing SERNEM generator to prepare and edit a site-specific method statement separately from this reference. Printing from the tool may require sign-in.

Open method statement generator →

Related field resources

Line breaking safety guide →LOTO verification form →