Product Overview

Summary: This Flange Management and Joint Integrity Safe Operating Procedure provides a structured, defensible approach to assembling, tightening, inspecting and maintaining bolted joints and flanged connections. It helps Australian workplaces prevent leaks, loss of containment and catastrophic failures, while supporting compliance with WHS obligations and industry best practice for pressure systems.

Flanged joints and bolted connections are critical barriers in any facility handling process fluids, steam, gas or hydrocarbons. When they fail, the consequences can be severe: leaks, fires, explosions, environmental releases, unplanned shutdowns and serious injuries. This Flange Management and Joint Integrity SOP sets out a clear, step‑by‑step system for the safe preparation, assembly, tightening, verification and documentation of flanged joints across the asset lifecycle. It is tailored for Australian operations and aligns with WHS expectations for managing risks associated with pressure equipment and hazardous chemicals.

The procedure addresses the common root causes of joint failure – such as incorrect gasket selection, inconsistent bolt loading, poor flange face condition, inadequate tagging and lack of traceability – and replaces ad‑hoc practices with a standardised, auditable process. From work planning and isolation, through controlled bolt‑up (including torqueing and tensioning), to leak testing and sign‑off, this SOP helps your teams work to a consistent standard whether during construction, routine maintenance or major shutdowns. By implementing it, businesses can significantly reduce leaks and rework, improve plant reliability, and demonstrate due diligence under Australian WHS law and relevant pressure equipment standards.

Key Benefits

• Reduce the risk of leaks, fires and loss of containment events arising from poorly assembled flanged joints.
• Ensure consistent, repeatable bolting practices across crews, shifts and contractors, reducing rework and downtime.
• Support compliance with WHS Regulations for pressure equipment and hazardous chemicals through a documented, auditable process.
• Improve asset reliability and plant availability by minimising flange-related failures during start-up and operation.
• Standardise training for fitters, contractors and supervisors using clear, practical steps and acceptance criteria for joint integrity.

Who is this for?

• Maintenance Supervisors
• Mechanical Fitters
• Shutdown and Turnaround Planners
• Project Engineers
• WHS Managers
• Operations Managers
• Plant Engineers
• Asset Integrity Managers
• Commissioning Engineers
• Pipeline Supervisors

Hazards Addressed

• Loss of containment of hazardous chemicals, hydrocarbons or steam due to flange or joint failure
• High-pressure fluid or gas release causing burns, injection injuries or impact from flying debris
• Fire and explosion risks from leaking flammable gases or liquids at flanged connections
• Exposure to toxic or corrosive substances from weeping or leaking joints
• Stored energy hazards during bolt tensioning and de-tensioning operations
• Manual handling and pinch point injuries while aligning flanges and handling gaskets and bolts
• Slips, trips and falls around work areas contaminated by leaks or lubricants used during assembly
• Hearing damage from sudden high-pressure releases during testing or failure

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Terminology (Flange Types, Ratings, Joint Integrity Terms)
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Applicable Legislation, Standards and Company Requirements
• 5.0 Pre-Work Planning and Risk Assessment (JSA/SWMS)
• 6.0 Isolation, Depressurisation and Verification of Zero Energy
• 7.0 Required Tools, Equipment and PPE (Including Torque/Tensioning Devices)
• 8.0 Flange and Bolt Inspection, Cleaning and Preparation
• 9.0 Gasket Selection, Handling and Installation Requirements
• 10.0 Flange Alignment and Assembly Practices
• 11.0 Bolt Tightening Methods (Torqueing, Tensioning, Cross-Pattern Sequences)
• 12.0 Joint Integrity Verification, Leak Testing and Acceptance Criteria
• 13.0 Tagging, Numbering and Traceability of Flanged Joints
• 14.0 Documentation, Joint Registers and Record Keeping
• 15.0 Non-Conformances, Defect Management and Rework Procedures
• 16.0 Interface with Contractors and Quality Control Inspections
• 17.0 Hazard Controls and WHS Considerations (Including High-Pressure and Chemical Exposure)
• 18.0 Emergency Response for Leaks and Loss of Containment at Flanges
• 19.0 Training, Competency Assessment and Refresher Requirements
• 20.0 Review, Audit and Continuous Improvement of Flange Management Program

Legislation & References

• Work Health and Safety Act 2011 (Cth) and equivalent state and territory WHS Acts
• Work Health and Safety Regulations 2011 (Cth), including provisions for hazardous chemicals and pressure equipment
• Safe Work Australia – Model Code of Practice: Managing risks of hazardous chemicals in the workplace
• Safe Work Australia – Model Code of Practice: Managing the risk of plant in the workplace
• AS/NZS 3788: Pressure equipment – In-service inspection
• AS 1210: Pressure vessels
• AS 4041: Pressure piping
• AS/NZS 4024 series: Safety of machinery (for mechanical and bolting equipment safety)
• AS/NZS 1891 series: Industrial fall-arrest systems and devices (where work at height around flanges is required)