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Corrosive Acids, Alkalis and Chemical Processing Risk Assessment

Corrosive Acids, Alkalis and Chemical Processing Risk Assessment

  • • 100% Compliant with Australian WHS Acts & Regulations
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Corrosive Acids, Alkalis and Chemical Processing Risk Assessment

Product Overview

Identify and control organisational risks associated with Corrosive Acids, Alkalis and Chemical Processing through a structured, management-level WHS Risk Management approach that focuses on systems, governance and lifecycle controls. This Risk Assessment supports compliance with the Work Health and Safety Act and Regulations, helping senior leaders demonstrate Due Diligence and reduce operational and legal exposure.

Risk Categories & Hazards Covered

This document assesses risks and outlines management controls for:

  • WHS Governance, Compliance and Safety Leadership: Assessment of leadership commitment, policy frameworks, roles, responsibilities and consultation arrangements specific to corrosive and reactive chemical operations.
  • Chemical Hazard Identification, Classification and Inventory Management: Management of SDS review, GHS classification, inventory registers, labelling and risk profiling for acids, alkalis and process chemicals.
  • Chemical Storage, Segregation and Bulk Handling Systems: Evaluation of storage design, segregation of incompatibles, bunding, ventilation, tank farms and bulk transfer infrastructure to minimise fire, explosion and release risks.
  • Plant, Equipment and Process Design for Corrosive and Reactive Chemicals: Assessment of material compatibility, corrosion resistance, containment, interlocks, guarding and engineering controls in fixed and mobile plant.
  • Chemical Handling, Transfer and Dosing Systems: Management of pumping, decanting, drum and IBC handling, dosing skids, hose and coupling selection, and backflow prevention to reduce spill and exposure risks.
  • Process Control, Monitoring and Alarm Management: Evaluation of process control systems, instrumentation, pH and conductivity monitoring, alarms, trips and shutdown logic to prevent loss of control events.
  • Supplier, Contractor and Outsourced Service Management: Protocols for prequalification, onboarding, scope definition and supervision of suppliers, tankers, maintenance contractors and chemical service providers.
  • Competency, Training and Authorisation for Chemical Operations: Assessment of competency frameworks, induction, refresher training, verification of competency and authorisation of personnel involved in chemical processing.
  • Safe Systems of Work, Procedures and Permits: Development and control of SOPs, job planning, isolation and lockout, confined space and hot work permits, and non-routine task management.
  • Health Monitoring, Exposure Control and PPE Management: Management of airborne and dermal exposure controls, ventilation, health surveillance, PPE specification, fit testing and maintenance programs.
  • Emergency Preparedness, Spill Management and Incident Response: Planning for chemical spills, loss of containment, first aid for corrosive exposure, emergency showers and eyewash, evacuation and liaison with emergency services.
  • Inspection, Maintenance and Integrity Management of Chemical Systems: Scheduled inspection, testing and preventive maintenance of tanks, lines, valves, bunds, safety showers, detectors and safety-critical elements.
  • Change Management, New Projects and Process Introduction: Formal management of change for new chemicals, process modifications, equipment upgrades and commissioning, including pre-start risk reviews.
  • Housekeeping, Waste Management and Decontamination Systems: Control of residues, leaks, incompatible waste mixing, neutralisation, decontamination processes and disposal in line with environmental and WHS requirements.
  • Documentation, Recordkeeping and Continuous Improvement: Governance of RA records, training logs, inspection reports, incident investigations, audit findings and corrective actions to drive ongoing improvement.

Who is this for?

This Risk Assessment is designed for Business Owners, Operations Managers, Safety Managers and Chemical Plant Supervisors responsible for planning, approving and overseeing corrosive acids, alkalis and chemical processing activities.

Hazards & Risks Covered

Hazard Risk Description
1. WHS Governance, Compliance and Safety Leadership
  • • Inadequate understanding and implementation of WHS Act 2011 and WHS Regulations in relation to hazardous chemicals and corrosive substances
  • • Absence of clear safety leadership and accountability for corrosive acids, alkalis and chemical processing risks
  • • Failure to integrate chemical safety into overall business risk management and due diligence processes
  • • Insufficient resourcing for safe management of corrosive and reactive chemicals (time, budget, competent personnel)
  • • Lack of consultation and communication with workers and Health and Safety Representatives about chemical hazards and changes to processes
  • • Inadequate oversight of contractors handling corrosive chemicals, cyanides, hydrogen peroxide and sulphuric acid on site
2. Chemical Hazard Identification, Classification and Inventory Management
  • • Incomplete or inaccurate register of hazardous chemicals used and generated in processes (including intermediates and by-products)
  • • Unclear classification of corrosive acids, alkalis, dehydrating substances, cyanides and oxidisers leading to underestimation of risk
  • • Failure to identify hazardous reaction products from endothermic processes, neutralisation reactions and etching operations
  • • Outdated, missing or incorrect Safety Data Sheets for hazardous chemicals (e.g. hydrogen peroxide, sulphuric acid, sodium hydroxide, cyanide solutions)
  • • Use of decanted or unlabelled containers for aggressive fluids, acid baths and caustic baths
  • • Inadequate tracking of chemical quantities, storage locations and segregation requirements
3. Chemical Storage, Segregation and Bulk Handling Systems
  • • Inadequate segregation of incompatible substances (e.g. acids and alkalis, cyanides and acids, oxidisers and organics) leading to violent reactions or toxic gas release
  • • Deficient design of bulk storage tanks, chemical baths and vats leading to structural failure, leaks or catastrophic release
  • • Insufficient bunding, spill containment and drainage management around storage and process vessels
  • • Storage of dehydrating substances and reactive chemicals in unsuitable conditions (heat, humidity, direct sunlight) affecting stability and reaction potential
  • • Inadequate controls for transfer of strong cleaning chemicals, caustic soda, sulphuric acid and hydrogen peroxide from bulk storage to process lines
  • • Poorly managed temporary or intermediate storage of aggressive fluids near work areas or emergency egress routes
4. Plant, Equipment and Process Design for Corrosive and Reactive Chemicals
  • • Poorly designed process reactors, etching systems and acid/caustic baths lacking adequate containment, agitation control and pressure relief
  • • Incompatible materials of construction for pipelines, valves, pumps and vessels handling corrosives, dehydrating substances and aggressive fluids
  • • Insufficient design consideration for endothermic or exothermic reaction profiles, leading to temperature excursions and loss of control
  • • Lack of interlocks and automation to prevent introduction of incompatible substances (e.g. acid into cyanide-containing streams, peroxide contamination)
  • • Inadequate provision of local exhaust ventilation or fume capture over acid baths, neutralisation tanks and cleaning stations
  • • Absence of fail-safe design features to manage loss of power, cooling or dosing control in hazardous process reactors
5. Chemical Handling, Transfer and Dosing Systems
  • • Reliance on manual handling and pouring of concentrated acids, alkalis and oxidisers without engineered controls
  • • Uncontrolled transfer of corrosive solutions leading to splashes, hose failures or overfilling of baths and reactors
  • • Inaccurate dosing of neutralising agents resulting in uncontrolled endothermic or exothermic reactions and off-gassing
  • • Backflow or cross-contamination between acid and caustic lines, or between peroxide and organic/metal contamination
  • • Inadequate safeguards for working with cyanide solutions and acid contact, risking generation of hydrogen cyanide gas
  • • Use of improvised or non-rated equipment (e.g. domestic hoses, unsuitable pumps) for aggressive fluids
6. Process Control, Monitoring and Alarm Management
  • • Insufficient monitoring of critical process parameters (temperature, pH, concentration, flow, pressure) in acid baths, caustic baths and hazardous process reactors
  • • Alarm systems not prioritised, poorly configured or routinely ignored (alarm fatigue), resulting in missed early-warning signs of loss of control
  • • Lack of integrated monitoring for gas generation, vapour release and oxygen depletion in areas using strong chemicals and dehydrating agents
  • • No formal procedures for responding to process deviations, trips and interlock activations
  • • Inadequate calibration and maintenance of analytical instruments (pH meters, conductivity probes, flow meters, gas detectors)
  • • Over-reliance on manual sampling without appropriate safeguards or clear instructions
7. Supplier, Contractor and Outsourced Service Management
  • • Use of chemical suppliers or contractors without adequate WHS systems for corrosive and reactive chemical management
  • • Inadequate communication of site-specific hazards (e.g. cyanide systems, hydrogen peroxide storage, endothermic reaction processes) to contractors
  • • Lack of integration between supplier technical advice and site procedures for safe use of acids, alkalis and specialist etching or cleaning chemicals
  • • Contractors performing maintenance or modification on chemical baths, reactors or neutralisation systems without proper isolation and decontamination
  • • Transport contractors not aligned with site loading, unloading and spill response procedures for hazardous chemicals
  • • No formal system to review performance and incidents involving external parties handling corrosive substances on site
8. Competency, Training and Authorisation for Chemical Operations
  • • Workers and supervisors lacking formal training in corrosive and reactive chemical hazards, including cyanide, hydrogen peroxide and sulphuric acid risks
  • • Inadequate understanding of endothermic and exothermic reactions, neutralisation processes and interaction of dehydrating substances with water or organics
  • • Poor awareness of early signs of loss of process control, chemical exposure symptoms or incompatible mixing
  • • No formal authorisation system for high-risk chemical tasks (e.g. operating hazardous process reactors, charging acid baths, handling cyanides)
  • • Training not refreshed or validated, leading to skill fade and inconsistent practices
  • • Insufficient training for emergency response actions related to chemical releases, exposure and decontamination
9. Safe Systems of Work, Procedures and Permits
  • • Absence of clear written procedures for managing chemical baths, caustic soda application, etching processes and hazardous reactors at a system level
  • • Inadequate integration of chemical risk controls into general site procedures (e.g. isolation, confined space entry, hot work near chemical systems)
  • • Non-standardised practices across shifts and teams in how chemical changes, additions and neutralisation are managed
  • • Lack of permit-to-work controls for non-routine or high-risk chemical activities such as tank entries, line breaking and system cleaning
  • • Procedures not reflecting current plant configuration, chemical concentrations or legislative requirements
  • • Complex or overly technical documentation leading to poor understanding and implementation by workers
10. Health Monitoring, Exposure Control and Personal Protective Equipment Management
  • • Chronic or acute exposure to corrosive vapours, mists and splashes from acid baths, caustic baths and aggressive cleaning processes
  • • Failure to recognise when health monitoring is required for specific substances (e.g. certain cyanide compounds or other scheduled hazardous chemicals)
  • • Inconsistent or inappropriate use of PPE due to poor selection, discomfort or lack of enforcement
  • • Insufficient controls for skin and eye contact risks associated with strong acids, alkalis and dehydrating substances
  • • Respiratory exposure due to inadequate engineering controls or incorrectly selected respiratory protective equipment
  • • No systematic program to assess worker health complaints or symptoms potentially linked to chemical exposure
11. Emergency Preparedness, Spill Management and Incident Response
  • • Inadequate planning and resourcing for chemical spills, uncontrolled reactions or loss of containment from baths, vats and reactors
  • • Lack of specific emergency response procedures for cyanide releases, hydrogen peroxide decomposition, sulphuric acid spills and acid–alkali neutralisation failures
  • • Insufficient availability of appropriately rated spill kits, neutralising agents and containment tools in relevant work areas
  • • Poorly defined communication, evacuation and escalation protocols for chemical incidents, especially during night shift or low staffing
  • • Limited training or drills for site personnel and emergency wardens in chemical incident scenarios
  • • Failure to integrate external emergency services into planning for major chemical incidents
12. Inspection, Maintenance and Integrity Management of Chemical Systems
  • • Corrosion, erosion or mechanical damage to tanks, vessels, pipework and valves handling corrosives and aggressive fluids
  • • Failure of protective linings, gaskets and seals in chemical baths, etching tanks and reactors
  • • Undetected leaks or weeping connections resulting in chronic low-level exposure or environmental contamination
  • • Inadequate preventive maintenance of critical safety devices (pressure relief valves, emergency shutdown valves, gas detectors, interlocks)
  • • Lack of systematic inspection of bunds, drains and containment structures surrounding chemical installations
  • • Maintenance work introducing new defects or incompatible materials into chemical systems
13. Change Management, New Projects and Process Introduction
  • • Introduction of new corrosive or reactive chemicals (e.g. different etchants, stronger cleaning agents, alternative neutralising chemicals) without comprehensive risk assessment
  • • Process changes affecting reaction conditions, residence time or concentration leading to unexpected endothermic or exothermic behaviour
  • • Modifications to equipment, layout or storage affecting ventilation, segregation or emergency access
  • • Failure to update training, procedures, permits and emergency plans following process or chemical changes
  • • Parallel operation of old and new systems creating confusion about which controls and procedures apply
  • • Inadequate review of supplier information for substitute products used in baths, reactors or cleaning processes
14. Housekeeping, Waste Management and Decontamination Systems
  • • Accumulation of residual corrosive liquids, crystals or sludge around baths, vats, drains and transfer points
  • • Improper storage or handling of chemical wastes, including spent acid baths, caustic baths and etching solutions
  • • Neutralisation of harmful elements or waste streams conducted without adequate controls on reaction heat, gas generation or effluent pH
  • • Cross-contamination of general waste with chemical waste leading to off-site risks during transport or disposal
  • • Inadequate decontamination of equipment and PPE before maintenance, storage or off-site repair
  • • Blocked or damaged drains and sumps reducing effectiveness of spill containment and increasing exposure risks
15. Documentation, Recordkeeping and Continuous Improvement
  • • Incomplete or inconsistent documentation of chemical risk assessments, controls and verification activities
  • • Inability to demonstrate compliance with WHS Act 2011, WHS Regulations and relevant Codes of Practice for hazardous chemicals due to poor recordkeeping
  • • Lessons from incidents, audits and worker feedback not captured or acted upon, leading to repeat chemical-related events
  • • Lack of visibility of chemical safety performance data for supervisors and management
  • • Obsolete or conflicting documents in circulation (e.g. outdated procedures, uncontrolled copies of SDSs)

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Legislation & References

This document was researched and developed to align with:

  • Work Health and Safety Act 2011
  • Work Health and Safety Regulations 2017
  • Model Code of Practice – Managing Risks of Hazardous Chemicals in the Workplace: Guidance on hazard identification, risk assessment and control of hazardous chemicals.
  • Model Code of Practice – Labelling of Workplace Hazardous Chemicals: Requirements for correct classification, labelling and hazard communication.
  • Model Code of Practice – Managing the Work Environment and Facilities: Requirements for ventilation, emergency showers, eyewash and general workplace conditions.
  • AS/NZS ISO 31000:2018: Risk management — Guidelines.
  • AS 1940: The storage and handling of flammable and combustible liquids (referenced where flammable corrosives are present in the process).
  • AS/NZS 2243 series: Safety in laboratories (relevant principles for chemical handling, storage and emergency equipment).
  • AS 3780: The storage and handling of corrosive substances.
  • AS 1319: Safety signs for the occupational environment.
  • AS 4775: Emergency eyewash and shower equipment.
  • AS/NZS 1715 & AS/NZS 1716: Selection, use and maintenance of respiratory protective equipment and performance requirements.
  • Globally Harmonized System (GHS) of Classification and Labelling of Chemicals: Framework for chemical classification and hazard communication.
Standard Risk Assessment Features (Click to Expand)
  • Comprehensive hazard identification for all activities
  • Risk rating matrix with likelihood and consequence analysis
  • Existing control measures evaluation
  • Residual risk assessment after controls
  • Hierarchy of controls recommendations
  • Action priority rankings
  • Review and monitoring requirements
  • Consultation and communication records
  • Legal compliance references
  • Sign-off and approval sections

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