Plant Risk Assessment

What Is a Plant Risk Assessment?

A Plant Risk Assessment is a structured document used to identify and manage safety risks associated with machinery and equipment in the workplace. In Australian workplaces, "plant" includes any machinery, vehicle, equipment, appliance, container, implement, or tool. This covers everything from small power tools and forklifts to large industrial cranes, conveyors, and tractors.

The primary purpose of this assessment is to protect workers and others from injury or illness caused by plant. It achieves this by systematically identifying hazards, evaluating the risks, and implementing control measures according to the "Hierarchy of Controls."

Under Australian Work Health and Safety (WHS) laws, a Person Conducting a Business or Undertaking (PCBU) must ensure, so far as is reasonably practicable, that plant is without risks to health and safety. The Plant Risk Assessment serves as the practical evidence that you have met this legal obligation. It is distinct from a Safe Work Method Statement (SWMS). While a SWMS outlines how to perform a high-risk construction activity safely, the Plant Risk Assessment focuses specifically on the dangers inherent to the machine itself, regardless of the task being performed.

This document is also essential during the procurement or commissioning phase. Before buying new machinery, a risk assessment helps determine if the equipment is fit for purpose and what additional safety guards might be required.

When to Use This Document

You must use a Plant Risk Assessment at several key stages of the equipment lifecycle. It is not just a "one-off" form used when a machine is new. You need to conduct a formal assessment in the following scenarios:

Procurement and Design Before you purchase, lease, or commission new plant, you must assess the risks. This ensures the equipment is suitable for the intended use and the specific environment of your workplace. For example, if you are buying an excavator to work near overhead powerlines, the assessment must consider the specific height and reach risks of that model.

Commissioning and Installation When the plant arrives on-site, you must verify that it matches the design specifications and that the installation is safe. This includes checking that safety guards are in place and that emergency stops function correctly. This step often links to the registration requirements for specific items like pressure equipment or cranes.

Operational Changes If you change how the plant is used, you must review the risk assessment. Using a forklift inside a cool room presents different risks (slippery surfaces, reduced visibility) than using it in a dry warehouse. Similarly, if you move machinery to a new site with different ground conditions or space constraints, a new assessment is required.

Modifications Australian industry practice requires a completely new Plant Risk Assessment if you modify the plant. Welding a new attachment onto an excavator or changing the software settings of a robotic arm alters the risk profile. You cannot rely on the original manufacturer's risk assessment for modified equipment.

Decommissioning and Dismantling Getting rid of plant is often as dangerous as using it. Dismantling a large press or removing chemical storage tanks requires a specific assessment to manage risks like stored energy, falling heavy parts, or exposure to hazardous substances.

Incidents and Near Misses If an incident occurs involving the plant, or a "near miss" where someone could have been seriously hurt, you must review the risk assessment immediately. This helps identify what went wrong and what new controls are needed to prevent recurrence.

Key Sections and Required Elements

A compliant Plant Risk Assessment must be detailed and specific to the piece of equipment. A generic checklist often fails to meet legal requirements because it does not account for the unique characteristics of the machinery or the site. Below are the essential sections your document must include.

Section 1: Plant Identification

This section ensures the correct asset is being assessed and links the document to your maintenance logs. You must include specific details such as the Plant ID or Asset Number, Make and Model, Serial Number, and Year of Manufacture. It is best practice to attach a clear photo of the plant. This prevents confusion, especially if you have multiple similar machines on site. This information helps you trace the machine's history and proves to inspectors that you have assessed the specific item in use.

Section 2: Hazard Identification

This is the core of the assessment where you systematically identify potential sources of harm. You should not rely on memory alone. The form should prompt you to check against specific hazard categories defined in the Work Health and Safety Regulation 2011 (Part 5.1). These categories usually include:

• Mechanical hazards: Moving parts, crushing points, cutting edges.
• Electrical hazards: Exposed wiring, static electricity, lack of earthing.
• Physical hazards: Noise, vibration, heat, cold, and radiation.
• Chemical hazards: Exhaust fumes, fluids, or dust produced by the plant.
• Ergonomic hazards: Repetitive movements, awkward postures required to operate the machine.

Section 3: Risk Assessment Matrix

You must quantify the severity of the risk to prioritize your actions. This is done using a risk matrix that measures Likelihood against Consequence. The Australian/New Zealand Standard AS/NZS ISO 31000:2018 guides this process.

• Likelihood: How likely is the harm to occur? (Scale ranging from Rare to Certain).
• Consequence: How severe would the outcome be? (Scale ranging from Insignificant to Catastrophic). The intersection of these two scores gives you a Risk Rating, typically classified as Low, Medium, High, or Extreme. This rating dictates how quickly you must act.

Section 4: Control Measures (Hierarchy of Controls)

This section is critical for legal compliance. You cannot simply state that workers will "be careful" or wear PPE. You must apply the Hierarchy of Controls, as mandated by Safe Work Australia. The document should have columns explicitly listing the hierarchy levels:

1. Elimination: Physically remove the hazard.
2. Substitution: Replace the hazard with something safer.
3. Engineering: Isolate people from the hazard (e.g., guards, sensors).
4. Administrative: Change the way people work (e.g., signage, training).
5. PPE: Protect the worker with Personal Protective Equipment. You must demonstrate that you have attempted to use higher-order controls before relying on PPE.

Section 5: Maintenance and Inspection Schedule

The assessment must outline how the plant will remain safe over time. You need to record dates for the next routine inspection, service due dates, and specific pre-start checks required by the manufacturer. For high-risk plant, such as hoists or pressure vessels, the WHS Regulations require specific logging by a "competent person." This section links the risk assessment to your daily Plant Inspection Checklist.

Section 6: Consultation and Sign-off

Under Section 49 of the WHS Act, you must consult with workers who are likely to be directly affected by the plant. Your document needs a signature or sign-off section to evidence this consultation has occurred. This usually includes signatures for the assessor, the site supervisor, and a representative of the workers using the plant.

How to Write a Plant Risk Assessment (Step by Step)

Writing a robust assessment takes time and focus. Follow these steps to ensure your document is legally sound and practically useful.

Step 1: Gather Information Before you start writing, collect the manufacturer’s manual, technical specifications, and any history of defects or incidents with similar machines. If the plant is second-hand, inspect it thoroughly for wear and tear. You need to understand the machine's limits and intended purpose.

Step 2: Identify the Plant and Context Fill out the identification section completely. Take a photo. Note the environment where the plant will be used. Is it indoors? Is the ground uneven? Are there pedestrians nearby? The context matters. A chainsaw used in a crowded public park has different risks than one used in a remote forest.

Step 3: Identify the Hazards Walk around the machine and inspect it while it is turned off and while it is operating (if safe to do so). Consult the workers who actually use it. Ask them what scares them about the machine. Check against the hazard categories listed in Section 2. Look for hidden dangers like pinch points that are hard to see, or noise levels that might require hearing protection.

Step 4: Assess the Risk For each hazard identified, determine the risk rating using your matrix. Be realistic. Do not underestimate the likelihood of a mistake. Humans make errors, and your assessment must account for this. For example, a guard that is easily removable presents a high risk, even if the machine itself is stable.

Step 5: Select and Implement Controls Refer to the Hierarchy of Controls. If a part of the machine moves at high speed and can crush a hand, your first thought should be "Can I eliminate this movement?" or "Can I put a physical guard over it?" If you cannot eliminate the risk, move down the list. Only record PPE as a control if you have exhausted the other options. Document exactly what the control is. Do not just write "Guard." Write "Interlocking guard that prevents machine start-up when open."

Step 6: Schedule Maintenance and Review Based on the manufacturer's instructions and the risk level, set a schedule for inspections. High-risk plant needs more frequent checks. Record these dates in the document. You should also set a review date for the entire assessment, usually every two years or sooner if conditions change.

Step 7: Consult and Sign Present the draft assessment to the operators and health and safety representatives. Get their feedback. They might spot a hazard you missed. Once everyone agrees, have the relevant parties sign the document. This creates a record that you have fulfilled your duty to consult.

Common Mistakes to Avoid

Using Generic Assessments One of the biggest mistakes is downloading a generic assessment for a "Forklift" and using it for every forklift in your fleet without modification. Generic assessments fail to account for the specific site environment. For example, a generic assessment might not mention the risk of collision with racking in your specific warehouse layout. It might also miss modifications you have made to the machine. Every assessment must be specific to the asset and the site.

Ignoring the Hierarchy of Controls Many businesses jump straight to PPE because it is easy and cheap. Writing "Safety Glasses Required" for a machine with exposed rotating blades is legally insufficient. If an inspector visits, they will ask if you considered engineering guards. Relying solely on PPE suggests you have not done what is "reasonably practicable" to eliminate the risk.

Failing to Consult Managers often write these assessments in an office without talking to the workers on the floor. This is a breach of Section 49 of the WHS Act. Workers often know the "workarounds" and real-world dangers that managers do not. An assessment written without worker input is rarely accurate and will not hold up in court.

Not Updating After Modifications If you weld an attachment onto an excavator, you change its centre of gravity and structural integrity. Failing to conduct a new assessment after a modification is a frequent cause of accidents. The original assessment is no longer valid.

Treating it as a "Set and Forget" Document A risk assessment is a snapshot in time. It is not a permanent fix. If you change the process, move the machine, or if a new incident occurs, you must review the document. Keeping an outdated assessment on file can be a liability because it shows you knew about the old risks but ignored the new ones.

Legal Considerations (AU)

Compliance with plant safety is strictly regulated in Australia. The primary duty of care falls on the PCBU, which is usually the employer or business owner.

The Model WHS Laws Most Australian states and territories follow the Model WHS Laws. Under the Work Health and Safety Act 2011 (Cth) and corresponding state Acts, specifically Sections 19 and 20, PCBUs must manage risks. The Work Health and Safety Regulation 2011 (Cth) mandates specific risk management processes in Part 5.1. Regulation 39 is particularly important; it states you must conduct a risk assessment if you are unsure whether the risk has been eliminated or minimized.

Registration Requirements Certain items of "plant design" and "specific plant" require registration with the WHS regulator. This includes items like pressure vessels, cranes, hoists, and amusement devices. You generally cannot use these items without a registration number. The risk assessment is a key part of the application for design registration, as you must prove the design is safe.

State Variations While most of Australia is harmonized, there are exceptions. Victoria operates under the Occupational Health and Safety Act 2004 (VIC) and the Occupational Health and Safety Regulations 2017 (VIC). If you are in Victoria, you must ensure your documents reference the "OHS" Act rather than WHS.

Western Australia has recently transitioned to the Work Health and Safety Act 2020 (WA), which largely harmonized with the rest of the country as of March 2024. However, you should always check for specific transitional provisions or local requirements. To protect your business across borders, your risk assessments should be robust enough to satisfy the strictest standards.

Australian Standards While Australian Standards like AS 4024.1 (Safety of Machinery) are not always legislation, they are crucial in court. Under WHS laws, you must do what is "reasonably practicable." Courts and inspectors use these standards as the benchmark to determine what a reasonable person would have done. Specifically, AS 4024.1201:2015 outlines the general principles for risk assessment. If an incident occurs and you have not met the relevant Australian Standard, it is very difficult to defend your actions.

Liability and Disclaimer A risk assessment does not absolve you of liability if you are negligent. However, a well-completed document demonstrates your commitment to safety. You can include a disclaimer stating that the document is a "snapshot" of risk at a specific time and that ongoing vigilance is required. It should state that the document complies with the Code of Practice: Managing the risks of plant in the workplace but does not constitute legal advice.

Frequently Asked Questions

Do I need a Plant Risk Assessment for every tool? Not necessarily. For low-risk, simple hand tools (like a hammer or screwdriver), a general risk assessment for the task might be sufficient. However, for any complex machinery, equipment with moving parts, or anything that could cause serious injury, a specific Plant Risk Assessment is required.

Who is responsible for signing the assessment? The PCBU (business owner) is ultimately responsible. However, the task is often delegated to a competent person, such as a safety manager, site supervisor, or engineer. This person must have the necessary knowledge and experience to understand the risks. Workers using the plant should also sign to confirm they have been consulted and understand the controls.

What is the difference between a Plant Hazard Assessment and a Safe Work Method Statement? They are related but different. A Plant Risk Assessment focuses on the equipment itself and its inherent dangers (e.g., an unguarded blade). A SWMS focuses on the high-risk construction activity (e.g., cutting concrete). In practice, the SWMS should reference the Plant Risk Assessment to ensure the machinery being used is safe.

How often do I need to update the assessment? You must review it whenever there is a change in the workplace, a change in how the plant is used, or if the plant is modified. Even without changes, best practice suggests reviewing the assessment every two years to ensure it remains current and maintenance schedules are being met.

Can I use an assessment from the manufacturer? Manufacturer manuals often include a hazard assessment. These are a great starting point, but they are not enough on their own. The manufacturer does not know your specific site conditions, your workers, or the other machinery you have nearby. You must use their information to create your own site-specific assessment.

What happens if I don't have one? If a Safe Work inspector visits your site and finds you are using plant without a risk assessment, they can issue an improvement notice or a prohibition notice stopping work. In the event of an injury, the lack of an assessment is strong evidence of a breach of duty of care, which can lead to substantial fines and prosecution.