Product Overview

Summary: This Hydrogen Sulphide (H2S) Safety Safe Operating Procedure sets out clear, practical steps for identifying, monitoring and controlling exposure to H2S in Australian workplaces. It helps businesses protect workers from a highly toxic, fast-acting gas while demonstrating due diligence and compliance with WHS legislation and industry best practice.

Hydrogen sulphide (H2S) is a highly toxic, colourless gas with a characteristic rotten egg odour that can rapidly deaden the sense of smell and cause collapse or death within minutes at high concentrations. It is commonly encountered in oil and gas operations, sewers, wastewater treatment plants, pulp and paper mills, food processing, and any process involving anaerobic decomposition. This Hydrogen Sulphide (H2S) Safety Safe Operating Procedure provides a structured, step-by-step approach to managing H2S risk – from initial hazard identification and atmospheric testing through to safe work methods, escalation triggers, and emergency response.

The SOP translates complex WHS and technical requirements into clear actions for frontline workers and supervisors. It covers the selection and use of fixed and portable gas detection, ventilation and isolation controls, personal protective equipment (including respiratory protection), and safe entry to confined and poorly ventilated spaces where H2S may accumulate. It also sets out communication protocols, permit-to-work interfaces, training requirements and incident reporting expectations. By implementing this procedure, businesses can significantly reduce the likelihood of fatal exposures, protect contractors and visitors, and provide evidence of a robust safety management system if an incident is investigated by a regulator.

Developed specifically for the Australian regulatory environment, this SOP aligns with model WHS laws and relevant Codes of Practice, helping organisations demonstrate that they have taken reasonably practicable steps to manage a known high-risk hazard. It supports consistent training, improves workforce confidence around H2S-prone tasks, and helps standardise practices across multiple sites, joint venture partners and labour-hire workers.

Key Benefits

• Reduce the risk of serious injury or fatality from acute Hydrogen Sulphide exposure through clear, task-based controls.
• Ensure compliance with Australian WHS legislation, confined space and hazardous chemicals requirements relating to H2S.
• Standardise the use of gas detection, respiratory protection and permit-to-work processes across all H2S-prone activities.
• Strengthen emergency preparedness with defined alarm responses, evacuation criteria and rescue procedures for H2S incidents.
• Improve worker confidence and competency when working in or around potential H2S environments through consistent training content.

Who is this for?

• WHS Managers
• HSE Advisors
• Site Supervisors
• Operations Managers
• Oil and Gas Field Technicians
• Water and Wastewater Treatment Operators
• Confined Space Workers
• Maintenance Planners
• Emergency Response Team Leaders
• Drilling and Rig Managers
• Processing Plant Supervisors

Hazards Addressed

• Acute inhalation of Hydrogen Sulphide leading to respiratory paralysis, unconsciousness and death
• Chronic exposure to low levels of H2S causing respiratory and neurological health effects
• Loss of sense of smell at moderate H2S concentrations leading to unrecognised over-exposure
• Accumulation of H2S in confined spaces, pits, sumps, tanks and low-lying areas
• Asphyxiation due to oxygen displacement in enclosed or poorly ventilated areas
• Fire and explosion risks where H2S accumulates in flammable concentrations
• Cross-contamination during opening of process lines, vessels and equipment containing sour gas or liquids
• Exposure during wastewater, sewer and sludge handling operations
• Exposure during drilling, well testing, production operations and pipeline work in sour fields

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Abbreviations (including H2S exposure limits and alarm set points)
• 3.0 Roles, Responsibilities and Competency Requirements
• 4.0 Hazard Identification and Risk Assessment for H2S
• 5.0 H2S Detection, Monitoring and Alarm Requirements
• 6.0 Control Measures and Hierarchy of Control for H2S Exposure
• 7.0 Personal Protective Equipment (PPE) and Respiratory Protection
• 8.0 Safe Work Procedures for H2S-Prone Tasks
• 9.0 Confined Space Entry and Permit-to-Work Interface
• 10.0 Communication, Signage and Barricading in H2S Areas
• 11.0 Emergency Response, Evacuation and Rescue Procedures for H2S Incidents
• 12.0 Health Monitoring, Fitness for Work and Medical Response
• 13.0 Training, Induction and Competency Verification
• 14.0 Equipment Inspection, Maintenance and Calibration (gas detectors and breathing apparatus)
• 15.0 Incident Reporting, Investigation and Corrective Actions
• 16.0 Document Control, Review and Continuous Improvement

Legislation & References

• Model Work Health and Safety Act and Regulations (as implemented in each Australian state and territory)
• Safe Work Australia – Code of Practice: Confined Spaces
• Safe Work Australia – Code of Practice: Managing Risks of Hazardous Chemicals in the Workplace
• Safe Work Australia – Code of Practice: How to Manage Work Health and Safety Risks
• AS/NZS 1715: Selection, use and maintenance of respiratory protective equipment
• AS/NZS 1716: Respiratory protective devices
• AS/NZS 60079 series: Explosive atmospheres (for electrical equipment in H2S hazardous areas)
• AS 2865: Confined spaces
• AS/NZS ISO 45001: Occupational health and safety management systems – Requirements with guidance for use