Summary

A confined space is an area that is substantially enclosed and poses significant health and safety risks, such as limited access, poor ventilation, or the presence of hazardous substances. Common examples include tanks, cellars, and silos. Work in these spaces is tightly regulated to minimise risks.

Employers have legal responsibilities to assess risks, ensure suitable training, and develop robust emergency plans to protect workers. Understanding the definition and associated hazards of confined spaces is key to maintaining safety and compliance.

Working in Confined Spaces: Understanding the Risks and Legal Duties

Confined spaces are among the most hazardous work environments, claiming the lives of around 15 workers annually in the UK and injuring many others. Due to these significant risks, work in confined spaces is strictly regulated. However, identifying where these regulations apply isn’t always straightforward.

Our comprehensive guide breaks down the legal definition of a confined space and outlines employers’ responsibilities under current legislation. Following this guide, you can ensure your confined space operations are safe, compliant, and aligned with best practices to protect your workforce.

Ensure safety and compliance; explore our guide today.

What Counts as a Confined Space?

A confined space is any area that “by virtue of its enclosed nature, there arises a reasonably foreseeable specified risk.”

This definition comes from the Confined Space Regulations 1997 (the Regulations). In practice, any enclosed (or partly enclosed) area that poses a significant risk of death or injury is a confined space. Examples listed in the Regulations include:

Chambers
Tanks
Vats
Silos
Pits
Pipes
Sewers
Flues

This list isn’t exhaustive. A confined space is defined by the risks it presents, not by its physical features. It’s essential to define them this way because confined spaces aren’t always prominent. For instance, some are temporary results of construction work.

Recognising Confined Spaces: Beyond the Obvious

Not all confined spaces are immediately recognizable. Some environments, like cellars or open-topped chambers, might not fit the typical image of a confined space. Without an overhead barrier, these areas might seem safe at first glance. However, because they are partially enclosed, they can still pose significant risks to workers.

It’s crucial to assess all spaces carefully, even those that don’t fit the casual definition of “confined,” to identify potential hazards and ensure worker safety. Understanding the hidden dangers of these spaces is key to compliance and protection.

What Are Specified Risks?

The “specified risks” are outlined in the Confined Space Regulations 1997. These risks come directly from the space’s enclosed or partially enclosed nature. They are:

Fire and Explosion: Flammable gases or vapours can accumulate and lead to explosions or fires.
Increased Body Temperature: Workers can lose consciousness due to dangerously high temperatures.
Asphyxiation: Loss of consciousness can occur from a lack of oxygen caused by:
- Gas.
- Fumes.
- Vapours.
- Limited oxygen supply.
Drowning: Water or other liquids can cause drowning if they suddenly flood the area.
Free-Flowing Solids: Substances like grain or sand can shift suddenly and bury workers, causing asphyxiation or cutting them off from areas with adequate oxygen supply.

You must comply with the Regulations if your assessment finds one or more risks.

Confined Space Training

Our Confined Space Training course educates workers on fundamentals of safe confined space work. It covers the risks, control measures and emergency procedures that all workers must know.

What Laws Apply to Work in Confined Spaces?

Your legal duties start with a risk assessment of your work. This is a requirement under the Management of Health and Safety at Work Regulations 1999. Your assessment must consider the following:

Work being done.
Working environment.
Working materials and tools.
Suitability of workers.
Emergency arrangements.

Work must comply with the Confined Spaces Regulations 1997 if the assessment identifies a specified risk. Under the Regulations, you must:

Avoid the work if possible: Tasks should be completed outside the enclosed space whenever practical.
Follow a safe system of work: If entry is unavoidable, create a secure system based on the risk assessment’s findings.
Make emergency arrangements: Develop a comprehensive rescue plan and ensure all necessary equipment and personnel are ready before work begins.

Other Regulations

Other regulations may apply depending on the work carried out.

Provision and Use of Work Equipment Regulations 1998 (PUWER): Maintenance work involving large plant and machinery may require personnel to work within the equipment itself, potentially creating a confined space. You must comply with PUWER to ensure all maintenance work is safe in these situations.
Personal Protective Equipment at Work Regulations 2022: Working in a confined space often requires personal protective equipment (PPE) like helmets, gloves and breathing apparatus. Under these regulations, you must supply suitable PPE and ensure it’s used correctly.

Essential Safety Measures for Confined Space Work

Safety measures depend on the nature of the work and the environment in which it is performed, so always refer to your risk assessment.

With this said, some measures apply to all forms of work in confined spaces. These are:

Appoint a Supervisor: Competent supervisors must oversee all work and check safety precautions at every stage.
Select Suitable Workers: Workers must be competent, with the knowledge, experience and training to carry out the task safely. You should also consider if they’re physically suited to the job. For example, are they able to comfortably enter and navigate the space?
Prepare Emergency Arrangements: Develop a comprehensive emergency plan, including communication methods, entry to confined spaces for rescuers and necessary equipment. Run regular drills to familiarise all participants with their roles and identify areas for improvement.
Have First-Aiders On-Site: Ensure trained first-aid personnel are available to respond promptly in case of an incident.

Where to Find More Guidance on Confined Space Safety

For detailed advice on safety measures, visit the Health and Safety Executive (HSE) website. It provides comprehensive guidance to help you understand legal requirements and best practices for working safely in confined spaces.

Key Takeaways

Definition and Risk Assessment – Confined spaces are characterised by fire, explosion, asphyxiation, or drowning risks. Conduct a thorough risk assessment to identify these hazards and implement appropriate safety measures.
Legal Responsibilities – Employers must assess the environment, tasks, and worker suitability. If specified risks are present, work must comply with the Confined Spaces Regulations 1997.
Avoid Confined Space Work When Possible – The safest option is to avoid entering confined spaces. Explore alternative methods to complete tasks from outside. If entry is unavoidable, follow a robust, secure work system and have a well-defined emergency plan.
Essential Safety Measures – General measures include appointing a competent supervisor, selecting suitable workers, and developing, testing, and practising emergency plans.
Training is Critical – Comprehensive training ensures workers understand potential hazards, follow safe working procedures, and are prepared to respond effectively during emergencies.

By adhering to these principles, you can minimize risks and maintain compliance with safety regulations.

Confined Space Training

Proper training is essential for anyone working in or around confined spaces. All individuals must receive clear instructions and thorough training to understand their responsibilities and safely perform tasks.

Our online Confined Space Training course informs workers of potential hazards and the control measures needed to mitigate them. While this course alone does not qualify someone to work in confined spaces, it covers the fundamentals of safe working practices and emergency procedures, ensuring a strong foundation for safety.

Invest in training to enhance safety and compliance in confined space operations.

This article was written by Mathew Oldham (HSQE Consultancy Ltd).

Mathew has over 20 years of experience in health and safety and an MSc (Hons) in Construction Management. Mathew is NEBOSH Health and Safety, Construction, Fire, Environment and Diploma qualified and CertIOSH.