Product Overview

Summary: This Hydraulic Line Flushing Safe Operating Procedure sets out a clear, step‑by‑step method for safely flushing hydraulic hoses, pipes and systems to remove contaminants before commissioning, maintenance or repair. It helps Australian workplaces control high‑pressure fluid hazards, protect costly equipment, and demonstrate compliance with WHS duties and relevant standards.

Hydraulic systems are the backbone of many Australian industries, from mining and civil construction to manufacturing, agriculture and transport. Contaminated or poorly maintained hydraulic lines are a leading cause of premature component failure, unplanned downtime and serious high‑pressure injection injuries. This Hydraulic Line Flushing Safe Operating Procedure provides a structured, repeatable approach for safely flushing new, repaired or contaminated hydraulic circuits, ensuring they are clean, de‑energised and fit for return to service.

The SOP goes beyond basic instructions by integrating WHS risk management into every stage of the task. It covers isolation and lockout of hydraulic energy, verification of zero‑pressure conditions, selection of suitable flushing media and filtration, control of environmental risks from spills, and clear acceptance criteria for cleanliness. By standardising how hydraulic line flushing is planned, executed and documented, this procedure helps businesses reduce equipment failures, protect workers from high‑pressure hazards, and provide defensible evidence of due diligence under Australian WHS legislation.

Key Benefits

• Reduce the risk of high-pressure fluid injection injuries by enforcing strict isolation, depressurisation and safe handling steps.
• Extend the life of hydraulic components by ensuring lines are flushed to defined cleanliness standards before commissioning or return to service.
• Minimise unplanned downtime and costly breakdowns through consistent contamination control and verification processes.
• Demonstrate compliance with Australian WHS laws and relevant hydraulic safety standards through documented, auditable procedures.
• Standardise training and competency expectations for technicians performing hydraulic line flushing across multiple sites and assets.

Who is this for?

• Maintenance Supervisors
• Hydraulic Technicians
• Mechanical Fitters
• Mobile Plant Operators
• Workshop Managers
• WHS Managers and Advisors
• Project Engineers
• Fleet Maintenance Coordinators

Hazards Addressed

• High-pressure hydraulic fluid injection injuries to hands and body
• Sudden release of stored hydraulic energy causing line whip or component ejection
• Exposure to hazardous hydraulic fluids, oils and cleaning agents via skin contact or inhalation
• Slips, trips and falls from oil leaks, spills and contaminated work areas
• Environmental contamination from uncontrolled discharge or disposal of flushing fluids
• Manual handling injuries from positioning hoses, flushing rigs and filtration equipment
• Burns or heat stress from working with elevated fluid temperatures during flushing
• Fire risk from flammable hydraulic fluids near ignition sources

Included Sections

• 1.0 Purpose and Scope
• 2.0 References, Definitions and Abbreviations
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Pre-Task Planning and Risk Assessment (JSA/SWMS)
• 5.0 Required Tools, Equipment and Flushing Rigs
• 6.0 Personal Protective Equipment (PPE) Requirements
• 7.0 Isolation, Lockout and Verification of Zero Energy
• 8.0 System Assessment and Selection of Flushing Method
• 9.0 Setup of Flushing Circuit, Filtration and Return Lines
• 10.0 Step-by-Step Hydraulic Line Flushing Procedure
• 11.0 Cleanliness Verification, Sampling and Acceptance Criteria
• 12.0 Management of Spills, Waste Fluids and Environmental Controls
• 13.0 Post-Task Inspection, Reinstatement and Functional Testing
• 14.0 Emergency Procedures for Leaks, Line Failures and Injection Injuries
• 15.0 Documentation, Records and Reporting Requirements
• 16.0 Training, Competency and Review of Procedure

Legislation & References

• Model Work Health and Safety Act 2011 (Cth) and equivalent state and territory WHS Acts
• Model Work Health and Safety Regulations 2011 (Cth) – Hazardous chemicals and plant
• Safe Work Australia – Code of Practice: Managing Risks of Plant in the Workplace
• Safe Work Australia – Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace
• AS 2671: Hydraulic fluid power – General requirements for systems
• AS 4024.1201: Safety of machinery – General principles for design – Risk assessment and risk reduction
• AS/NZS 1715: Selection, use and maintenance of respiratory protective equipment
• AS/NZS 2161: Occupational protective gloves
• AS 1940: The storage and handling of flammable and combustible liquids
• AS/NZS 4801: Occupational health and safety management systems (superseded but still widely referenced)
• ISO 4406 (referenced for hydraulic fluid cleanliness coding, where adopted by the business)