What are pressure regulations and why do they matter for compressed air systems?

Compressed air systems are essential to many manufacturing and industrial processes, powering everything from production machinery to pneumatic tools. However, because compressed air is stored under pressure, it also presents significant safety risks if equipment is not properly maintained and inspected.

This is where pressure regulations come in.

The UK Pressure Systems Safety Regulations 2000 (PSSR) were introduced to help prevent accidents, equipment failures and injuries caused by the release of stored energy from pressurised systems. For businesses operating compressed air equipment, understanding these regulations is not only important for compliance but also for maintaining a safe, reliable and efficient operation.

What are the pressure systems safety regulations (PSSR)?

The Pressure Systems Safety Regulations 2000 (PSSR) are UK health and safety regulations that govern the safe operation of pressure systems used in the workplace.

The regulations are designed to prevent serious injury caused by the failure of pressure vessels, pipework or other pressurised components. They apply to a wide range of industrial equipment, including many compressed air systems.

You can read the official regulations on the UK Government legislation website.

The Health and Safety Executive (HSE) also provides guidance on how PSSR applies in practice.

Does PSSR apply to compressed air systems?

In most cases, yes.

According to the HSE, pressure systems containing compressed air above 0.5 bar pressure are considered relevant pressure systems and may fall under PSSR requirements.

This can include:

• Air compressors
• Air receivers
• Compressed air pipework
• Filters and dryers
• Pressure vessels
• Safety valves and pressure relief devices

For many manufacturers, a complete compressed air installation forms a pressure system that must be properly inspected and managed throughout its lifecycle.

If you're unsure whether your equipment falls within the regulations, our team can help assess your existing compressed air system.

What is a written scheme of examination (WSE)?

One of the most important requirements under PSSR is the Written Scheme of Examination (WSE).

A WSE is a legal document that identifies:

• Which components require examination
• How inspections should be carried out
• The frequency of examinations
• Any special safety requirements

The Written Scheme must be prepared before a qualifying pressure system is operated.

The HSE states that users of installed pressure systems must not operate equipment unless a suitable Written Scheme of Examination is in place.

What equipment is usually included in a WSE?

The exact contents of a WSE depend on the system, but commonly include:

• Air receiver vessels
• Safety relief valves
• Pressure gauges
• Pressure switches
• Over-temperature devices
• Pipework
• Air dryers and filtration equipment

Many of these components play an important role in both safety and air quality. Regular inspection helps ensure the system continues to operate safely and efficiently.

You can learn more about compressed air filtration and drying equipment on our air treatment page:

What is a competent person?

PSSR requires examinations to be carried out by a competent person.

The HSE defines competence as a combination of:

• Technical knowledge
• Relevant qualifications
• Practical experience
• The ability to make independent safety judgements

The competent person is responsible for:

• Preparing or certifying the Written Scheme of Examination
• Carrying out inspections
• Reporting defects
• Assessing safety-critical equipment
• Recommending corrective actions where necessary

They may also recommend changes to examination intervals based on the condition and risk profile of the equipment.

Why pressure regulations matter for compressed air systems

Protecting people and equipment

Compressed air systems store large amounts of energy. If a pressure vessel, receiver or pipework fails, the consequences can be severe.

Potential risks include:

• Serious injury to employees
• Damage to machinery
• Production downtime
• Costly repairs

Pressure regulations help minimise these risks by ensuring systems are inspected and maintained correctly.

Improving reliability

Regular inspections often identify developing issues before they become major failures.

Common findings include:

• Corrosion
• Damaged safety valves
• Pressure gauge faults
• Air leaks
• Pipework deterioration

Addressing these issues early can help avoid unplanned downtime and improve overall system reliability.

Supporting system efficiency

Pressure system inspections often uncover problems that impact performance as well as safety.

For example, faulty pressure controls or inefficient air treatment equipment can increase energy consumption and reduce system effectiveness.

Many businesses combine compliance inspections with broader compressed air optimisation programmes to improve efficiency and reduce operating costs.

Avoiding legal consequences

Failure to comply with PSSR can result in:

• HSE enforcement action
• Improvement notices
• Prosecution
• Significant fines

Most importantly, non-compliance increases the risk of workplace accidents and equipment failure.

How Maziak can help

At Maziak, we provide a complete range of pressure system compliance services to help businesses meet their legal obligations and maintain safe, efficient operations.

You can also learn more about pressure-related technologies in our guide to Pressure Swing Adsorption (PSA) systems and nitrogen generators.

Frequently Asked Questions

What is the purpose of the Pressure Systems Safety Regulations?

PSSR exists to prevent serious injury caused by the failure of pressure systems and the uncontrolled release of stored energy.

Does every compressed air system require a Written Scheme of Examination?

Not every system will require one, but many industrial compressed air installations containing pressure vessels or air receivers will fall under PSSR requirements.

Who is responsible for pressure system compliance?

The owner or user of the pressure system is responsible for ensuring the system complies with the regulations and has a valid Written Scheme of Examination where required.

How often should pressure systems be inspected?

Inspection frequency is determined by the Written Scheme of Examination and the recommendations of the competent person.

What happens if a business fails to comply with PSSR?

Failure to comply can result in enforcement action, fines, prosecution and increased safety risks for employees and equipment.

Can pressure inspections improve compressed air efficiency?

Yes. Inspections often identify issues such as leaks, faulty controls and equipment deterioration that can negatively impact system performance and increase energy costs.