Product Overview

Summary: This Propulsion System Alignment Safe Operating Procedure provides a clear, step-by-step method for safely inspecting, aligning and verifying marine or industrial propulsion systems. It helps Australian operators minimise vibration, prevent catastrophic mechanical failures and maintain WHS compliance when working around rotating machinery and confined spaces.

Propulsion system alignment is a critical maintenance activity for vessels and rotating plant, directly affecting safety, reliability and lifecycle cost. Misalignment between engines, gearboxes, shafts and propellers can generate excessive vibration, heat and stress, leading to coupling failures, shaft fractures, bearing damage and, in severe cases, loss of propulsion and loss of vessel control. This Safe Operating Procedure provides a structured, repeatable method for planning and carrying out alignment tasks in accordance with Australian WHS requirements, ensuring that work around rotating equipment, confined spaces and elevated areas is controlled and documented.

Developed for Australian marine, defence, offshore and industrial operators, the SOP sets out how to safely isolate systems, verify zero-energy states, conduct pre-alignment inspections, perform rough and fine alignment (dial indicator or laser-based), and carry out post-alignment verification and documentation. It addresses practical challenges such as working in dry docks or slipways, managing hot work or lifting operations in engine rooms, coordinating contractors and ensuring that risk controls are in place before any adjustment is made. By implementing this procedure, organisations can reduce unplanned downtime, extend equipment life and demonstrate due diligence under WHS legislation and relevant marine engineering standards.

Key Benefits

• Reduce the risk of mechanical failure, shaft fracture and loss of propulsion by enforcing a consistent, engineering-based alignment process.
• Ensure compliance with Australian WHS obligations when working around rotating machinery, confined spaces and lifting operations.
• Extend the service life of propulsion components by minimising vibration, bearing load and coupling stress.
• Standardise alignment practices across shipyards, workshops and fleets, improving training, supervision and quality control.
• Improve operational reliability and fuel efficiency through accurate alignment and documented verification checks.

Who is this for?

• Marine Engineers
• Shipyard Supervisors
• Vessel Maintenance Managers
• Mechanical Fitters
• Marine Technicians
• Dry Dock Managers
• WHS Managers
• Fleet Operations Managers
• Defence and Patrol Vessel Maintenance Coordinators
• Harbour and Port Engineering Managers

Hazards Addressed

• Entanglement or contact with rotating shafts, couplings and drive components
• Crush injuries from uncontrolled movement of machinery during adjustment or lifting
• Musculoskeletal injuries from awkward postures and manual handling of heavy components and tools
• Slips, trips and falls in engine rooms, dry docks and confined workspaces
• Exposure to noise, heat and poor ventilation in machinery spaces and confined spaces
• Eye and hand injuries from use of hand tools, measuring devices and shimming materials
• Electric shock or burns from inadequately isolated electrical drives or associated systems
• Fire and explosion risks when hot work is conducted near fuels, lubricants or flammable residues

Included Sections

• 1.0 Purpose and Scope
• 2.0 References, Definitions and Abbreviations
• 3.0 Roles and Responsibilities
• 4.0 Required Competencies and Training
• 5.0 Tools, Equipment and Alignment Instruments
• 6.0 Personal Protective Equipment (PPE) Requirements
• 7.0 Pre-Job Planning and Risk Assessment (JSA/SWMS)
• 8.0 Isolation, Lockout/Tagout and Verification of Zero Energy
• 9.0 Work Area Preparation (Engine Room, Dry Dock, Slipway)
• 10.0 Pre-Alignment Inspections and Condition Checks
• 11.0 Rough Alignment Procedure
• 12.0 Fine Alignment Procedure (Dial Indicator and Laser Methods)
• 13.0 Tolerances, Acceptance Criteria and OEM Requirements
• 14.0 Adjustments, Shimming and Re-Verification Steps
• 15.0 Managing Confined Space and Hot Work Requirements
• 16.0 Quality Assurance, Measurement Recording and Sign-Off
• 17.0 Post-Alignment Testing, Run-Up and Vibration Checks
• 18.0 Housekeeping, Demobilisation and Restoration of Plant
• 19.0 Emergency Procedures and Incident Reporting
• 20.0 Document Control, Review and Continuous Improvement

Legislation & References

• Work Health and Safety Act 2011 (Cth) and corresponding state and territory WHS legislation
• Work Health and Safety Regulations 2011 (Cth) – Plant and High Risk Work provisions
• Safe Work Australia – Code of Practice: Managing risks of plant in the workplace
• Safe Work Australia – Code of Practice: Confined spaces
• AS/NZS 4024.1: Safety of machinery – Series
• AS/NZS ISO 31000: Risk management – Guidelines
• Marine Order 504 (Australian Maritime Safety Authority) – Certificates of operation and vessel safety management systems
• AS 4991: Lifting devices (for use of chain blocks and lifting equipment during alignment)