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“An outdoor cabinet can protect an extinguisher from rain, but it cannot make the wrong extinguisher suitable for freezing weather.”

A fire extinguisher needs to suit both the fire risk and the conditions where it is installed.

An unheated garage, construction site, vehicle or forecourt can expose equipment to frost, direct sunlight, rain and physical damage. These conditions matter even when the extinguisher looks fine from the outside.

There is no single safe temperature range for every fire extinguisher. The starting point is the operating range stated on the individual model, followed by a suitable position and maintenance arrangement.

Explore Velocity Safety’s outdoor fire extinguisher cabinets, stands and fully assembled fire point trolleys.

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What Is the Safe Temperature Range for a Fire Extinguisher?

The safe operating temperature depends on the extinguisher’s make, model and contents. Check the rating on its label or technical information before choosing where to keep it.

As a concrete example, two extinguishers supplied by Britannia Fire have different ratings:

These are ratings for specific products. Other water, foam, powder, CO₂ and specialist extinguishers can have different limits. Do not apply a temperature range to every extinguisher simply because it uses the same extinguishing agent.

The minimum rating is also not the same as the contents’ freezing point. A +5°C rating does not mean the extinguisher freezes instantly at +4°C. It means the manufacturer has specified the unit for use within its stated conditions.

Can Fire Extinguishers Be Kept Outside or in a Garage?

Yes. Outdoor storage can be appropriate when the extinguisher is suitable for the fire risk and its position, including the lowest and highest temperatures likely at that location.

Before installing an extinguisher on a forecourt, in an unheated garage or at an outdoor construction fire point, consider:

• The model’s stated temperature range
• Overnight and winter conditions
• Direct sunlight and heat during summer
• Rain, moisture and possible corrosion
• Impact, vehicle movement or unauthorised interference
• Whether the extinguisher will remain visible and accessible
• The fire classes and risks at that specific position

An extinguisher is not automatically unsuitable because it is outdoors. Its selection, protection, positioning and maintenance must be appropriate for that site.

Do Fire Extinguishers Freeze in Cold Weather?

The contents of some water-based extinguishers can freeze when exposed to sufficiently low temperatures. The risk depends on the formulation, the model’s rating and how long the equipment has been exposed.

Water, foam and wet chemical extinguishers should therefore be checked against their individual specifications before being placed in an unheated location. Some powder and CO₂ models have lower minimum operating temperatures, but those units must still be suitable for the fire risk and protected from physical damage.

If an extinguisher appears damaged, may have frozen or has been exposed outside its stated operating range, do not assume it is ready for use just because it has warmed up again. Have it assessed by a competent provider and ensure appropriate fire protection remains available.

Will an Outdoor Fire Extinguisher Cabinet Prevent Freezing?

A suitable fire extinguisher cabinet, stand or trolley can help position the extinguisher, make the fire point visible and protect equipment from rain or accidental damage.

However, weatherproof does not necessarily mean frost-proof. An ordinary unheated cabinet may eventually reach the surrounding outdoor temperature. An insulated cover alone cannot be relied upon to keep equipment above its minimum rating through prolonged cold weather.

If a water-based extinguisher must be kept at an exposed location where temperatures may fall below its rating, discuss an alternative suitably rated extinguisher, a sheltered indoor position or an appropriately specified heated enclosure. The right choice must still follow the site’s fire risk assessment.

Can a Fire Extinguisher Be Left in Direct Sunlight or a Hot Vehicle?

Direct sunlight and parked vehicles can expose an extinguisher to substantial heat. Check whether the likely temperature at its storage position will remain within the model’s stated range.

Excessive heat can affect pressure, seals and other components. An extinguisher kept in a vehicle must also be securely mounted, protected against damage and accessible when needed.

Do not assume a closed cabinet will remain cool simply because it shields the extinguisher from sunlight. Consider its position and design as well as the conditions around it.

Can a Fire Extinguisher Explode in the Heat?

Fire extinguishers are pressurised equipment. They are designed for use within specified conditions, but excessive heat, serious damage or corrosion can create a hazard.

It would be misleading to promise that every model has the same pressure-relief design or that a unit cannot fail dangerously. If an extinguisher has been exposed to excessive heat, appears damaged, leaks or may have vented, have it assessed before relying on it.

Are P50 Fire Extinguishers Suitable for Outdoor Use?

Britannia P50 extinguishers have corrosion-resistant composite construction, but the P50 name does not give every model the same temperature range or fire rating.

Velocity Safety supplies and installs 6-litre P50 water mist and 6kg P50 ABC powder extinguishers. Britannia rates the water mist model from +5°C to +60°C and the powder model from -20°C to +60°C.

The powder model may be appropriate for some colder external positions, provided it suits the identified Class A, B or C fire risks. Powder can reduce visibility and leave substantial residue, so it should not automatically replace water mist in every setting.

The correct equipment, quantity and position should be decided through a site assessment. A cabinet or stand may still be needed to protect the selected unit and keep the fire point accessible.

Learn more about Velocity Safety’s UK-wide P50 fire extinguisher supply and installation service.

How Often Should Outdoor Fire Extinguishers Be Checked?

Weather-exposed extinguishers may need more frequent visual checks than equipment kept in a protected indoor position. Check that each unit:

• Remains in its designated position and is accessible
• Has not been discharged or tampered with
• Shows no obvious damage, leakage or corrosion
• Has a legible label and instructions
• Has a pressure gauge in the correct range, where fitted
• Remains within its stated temperature conditions

The responsible person should follow the manufacturer’s instructions and the maintenance programme for the premises. Conventional extinguishers generally receive annual maintenance by a competent person, with additional work determined by their type and condition.

Britannia P50 extinguishers follow their own manufacturer-prescribed programme. They still require recorded annual maintenance checks by a trained, competent person, even though an external annual service is not required during their first 10 years when those checks are completed correctly.

There is no single age at which every extinguisher must be replaced. If a unit is damaged, discharged or unsuitable for its location, arrange an assessment and appropriate replacement or recommissioning. Equipment removed from service can be handled through Velocity Safety’s fire extinguisher disposal service.

Final Takeaway

An outdoor fire extinguisher must match both the fire risk and the conditions at its installation point.

Check the individual model’s temperature range. Then consider whether its position, cabinet or stand will protect it from weather and damage while keeping it accessible. Plan additional checks where the equipment faces more demanding conditions.

If winter temperatures may fall below the chosen model’s minimum rating, weatherproofing alone is not the answer. Select a suitable extinguisher or a properly specified location.

Frequently Asked Questions

What temperature should a fire extinguisher be stored at?

Store it within the temperature range stated for its individual model. The minimum and maximum vary between extinguishers; there is no universal range for every type.

Do fire extinguishers freeze at +5°C?

No. +5°C is the minimum stated operating temperature of some models, not a universal freezing point. Water-based contents can freeze in sufficiently cold conditions, so check the model’s instructions and have equipment assessed if it has been exposed outside its rated range.

Can fire extinguishers be stored outside?

Yes, if the model suits the fire risks and expected temperatures, remains accessible and receives appropriate protection and checks. An ordinary weatherproof cabinet does not necessarily provide frost protection.

Can a fire extinguisher be kept in a hot car?

Check the model’s temperature rating against the conditions the vehicle may reach, especially when parked in direct sunlight. The extinguisher should also be securely mounted and accessible.

Are powder extinguishers suitable for cold outdoor locations?

Some powder models have lower minimum operating ratings than water-based models. Check the specific unit and make sure powder is suitable for the fire risks and people at that location.

Are P50 fire extinguishers frost-proof?

Not as a range. Britannia rates its 6-litre P50 water mist model from +5°C to +60°C and its 6kg P50 ABC powder model from -20°C to +60°C. Check the exact model before choosing an outdoor position.

Should fire extinguishers be stored upright?

Follow the manufacturer’s mounting instructions and use a suitable bracket, cabinet or stand. Keep the unit secure, visible and accessible.

How often should outdoor fire extinguishers be inspected?

Carry out visual checks at a frequency appropriate to the location and exposure, alongside the required maintenance for the particular extinguisher. Conventional extinguishers generally receive annual competent-person maintenance. P50 extinguishers have a separate manufacturer-prescribed annual check programme.

Resources

• • GOV.UK – Fire Safety Risk Assessment and Equipment Maintenance Guidance

On a live construction site, a fire point has to work first time – signage clear, stands stable, and extinguishers ready to use.

We recently helped a new construction client source portable fire extinguisher stands and accessories. Since then, we’ve also developed dedicated scaffold fire point stands for sites where standard floor-standing units are not practical.

There were two problems:

• Problem 1: The lead time for branded fire signage was over a week.
• Problem 2: The client’s site could only accept deliveries before 9am, but the courier service could only guarantee pre-10am – not good enough.

So we found a workaround. Two, actually.

Solving Fire Safety Problems Without the Hassle

• ✅ Signage? We organised faster third-party printing and threw in their company logo – free of charge – to shave days off the lead time.
• ✅ Delivery? We had the entire order delivered to us first, then personally dropped it off at site before 9am. No missed delivery window. No third-party haulage delays. Just sorted.
• ✅ Assembly Support? Although the client opted for a supply-only service, they had multiple sites and local assembly teams.

So we:

1. Pre-built one unit as a model for the rest
2. Supplied better fixings (bolts, repair washers, nylocs)
3. Included a tube of Soudal Fix All for secure signage fitting
4. Because that’s how we’d want it done ourselves.

Why It Matters

Construction sites don’t have time to chase suppliers, rebook deliveries, or fix bodged installations. If your extinguisher setup isn’t stable, signed, and site-ready, it’s a compliance issue waiting to happen.

For scaffolded projects, temporary works and multi-level sites, a standard floor-standing fire point is not always the safest or most practical option. A scaffold-mounted fire point stand can help keep extinguishers, alarms and signage closer to the working area without creating another floor-level obstruction.

Velocity Safety delivers more than just kit:

• Custom branding and site-specific layout guidance
• Early morning delivery options to meet contractor schedules
• Advice on cabinet choice, trolley fixings, and extinguisher pairing
• No-nonsense problem solving when logistics hit a wall

Need Fire Extinguisher Stands for a Construction Site?

Whether you want us to handle supply only or full install, we can help with:

• Scaffold fire point stands for scaffolded and multi-level construction sites
• Extinguisher trolleys, stands, cabinets & accessories
• Branded fire extinguisher signage
• Fire extinguisher commissioning
• Pre-delivery assembly or guidance (fire extinguisher supply and installation)
• Reliable site-time delivery

👉 Explore our Fire Extinguisher Servicing & Maintenance options for full compliance support.

Already replacing old site extinguishers? We also handle safe, compliant fire extinguisher disposal – including collection for bulk quantities. If your kit is out of date or not fit for redeployment, we’ll ensure it’s removed legally and without the hassle.

Alternatively, email info@velocitysafety.co.uk to discuss your next job.

Air compressors seem like set-and-forget tools – plug them in, pressurise, and get on with the job.

But hidden inside the vessel is a rust time bomb if you’re not draining regularly.

Why Moisture Is a Problem

Every time your compressor runs, it pulls in air – and air naturally contains moisture. That moisture has nowhere to go. It condenses inside the tank, settles, and starts eating away at the steel from the inside out.

Steel + Water = Rust.

Left unchecked, that rust weakens the tank wall, reduces pressure retention, and increases the risk of catastrophic failure. In worst-case scenarios, tanks can rupture – and yes, the result can be explosive.

A “Vengaboys Situation” Waiting to Happen

Ross Ciraolo, our Director, puts it bluntly: “You end up with a Vengaboys situation 💥💥💥💥” – not the kind of bang you want on-site.

To avoid that, draining compressors daily when in use is essential. It’s basic maintenance that massively extends the life of your equipment and reduces safety risks.

It’s Not Just Common Sense – It’s a Legal Requirement

If your compressor exceeds 250 bar/litres in stored energy, you need:

• A Written Scheme of Examination (WSE)
• Periodic Thorough Examinations by a competent person
• Clear maintenance records showing regular drainage and servicing

These requirements fall under the Pressure Systems Safety Regulations 2000 (PSSR) – and no, they don’t have to be carried out by your insurer. We can help develop your WSE, inspect your systems, and keep your site compliant.

Need Help with PSSR Compliance?

Velocity Safety provides full support for PSSR compliance:

• Written Scheme of Examination (WSE) creation
• Safety valve and gauge inspections
• Thorough examination of air receivers and pressure vessels
• Advice on safe drainage schedules and maintenance

👉 Explore our PSSR Services or email info@velocitysafety.co.uk to get booked in.

Yes – and it’s one of the most commonly overlooked compliance gaps in workplaces using on-tool extraction.

Portable dust extractors are often treated like ordinary site vacuums. But when they are used to control hazardous dust at source, they may fall under Local Exhaust Ventilation (LEV) requirements.

According to the HSE, on-tool extraction is a form of LEV. This means portable dust extractors used for sanding, cutting, drilling, grinding, chasing, woodworking or concrete work may require a Thorough Examination and Test (TExT) under the Control of Substances Hazardous to Health Regulations 2002 (COSHH), specifically Regulation 9.

For most LEV systems, the maximum interval between thorough examination and testing is 14 months, although higher-risk or heavily used systems may need more frequent checks.

Here’s what this guide covers:

Why Portable Dust Extractor LEV Testing Matters

Portable dust extractors are often assumed to be plug-and-play. But when used on construction sites, in workshops or in manufacturing environments, they are actively controlling airborne contaminants.

If the extractor is damaged, blocked, fitted with the wrong filter or performing poorly, workers may still be exposed to hazardous dust.

Without proper inspection and maintenance, portable extractors may:

• Recirculate dust back into the workspace
• Fail to trigger alarms when blocked
• Deliver inadequate airflow at the tool
• Give users false confidence that exposure is being controlled
• Fail to provide suitable protection against silica, wood, MDF, concrete or brick dust

You are not just protecting tools and work areas. You are protecting lungs.

💡 Key Quote from the HSE:
“On-tool extraction is a form of LEV and must be thoroughly examined and tested.”
Source – HSE Guidance on LEV and On-Tool Extraction

What Is Portable LEV?

Portable LEV refers to mobile extraction equipment designed to capture hazardous dust, fumes or airborne contaminants close to where they are created.

Common examples include dust extractors connected directly to tools during:

• Cutting
• Grinding
• Sanding
• Drilling
• Chasing
• Woodworking
• Concrete or masonry work

Unlike a general cleaning vacuum, portable LEV is used as an exposure control measure. Its purpose is to help stop hazardous substances entering the breathing zone in the first place.

Do L-Class, M-Class and H-Class Extractors Need Testing?

The class of extractor matters, but the key question is how the equipment is being used.

If an L-Class, M-Class or H-Class extractor is being used as part of an on-tool extraction system to control hazardous dust at source, a Thorough Examination and Test may be required.

As a general guide:

• L-Class extractors are typically used for lower-risk dusts.
• M-Class extractors are commonly used for medium-risk dusts, including many construction and woodworking applications.
• H-Class extractors are used for higher-risk dusts where stricter containment is required.

The issue is not just the label on the machine. The extractor needs to be suitable for the dust hazard, fitted with the correct filter, performing properly and maintained in line with COSHH.

How Often Should Portable LEV Be Tested?

Under COSHH Regulation 9, LEV systems must be thoroughly examined and tested at suitable intervals. In most cases, this means at least once every 14 months.

However, the inspection frequency may need to be shorter where the system is:

• Used heavily
• Used in high-dust environments
• Used with high-risk dusts
• Frequently moved between sites
• Damaged or poorly maintained
• Relied on as a key control measure for worker exposure

If your extractor is being used for silica dust, MDF dust, hardwood dust, softwood dust, concrete dust, brick dust or other hazardous airborne substances, the testing interval should be based on the level of risk and how the equipment is used on site.

For wider LEV testing frequency guidance, see our guide: How Often Should LEV Be Tested?

What Does a Portable Dust Extractor TExT Involve?

A proper Thorough Examination and Test should look beyond whether the machine switches on.

Velocity Safety can carry out TExTs on portable dust extractors, including H-Class, M-Class and L-Class units where relevant.

The Extraction Unit TExT

For on-tool extraction, HSE states that the formal Thorough Examination and Test applies to the extraction unit itself.

The TExT can include:

• Checking the extraction-unit body, latches, seals and inlet connections for damage or leakage
• Confirming the correct filter is fitted and assessing its condition
• Checking gauges, airflow indicators and alarms
• Testing the filter-cleaning mechanism where fitted
• Measuring airflow or technical performance against the applicable operating criteria
• Checking that low-flow alarms or indicators activate correctly
• Recording defects, performance results and required actions

Maintenance Checks for the Complete On-Tool System

The interchangeable parts used with the extraction unit are covered by the employer’s regular maintenance arrangements.

These checks should consider:

• Measuring airflow rate to confirm extraction effectiveness
• Checking alarms and indicators
• Inspecting filter condition, compatibility and classification
• Checking hoses, seals and connections
• Looking for damage, blockages or signs of poor maintenance
• Reviewing whether the extractor is suitable for the dust hazard
• Issuing a report with findings, compliance status and remedial actions

A good examination should help you understand whether the extractor is actually controlling exposure, not just whether it looks acceptable on the outside.

Why Filters Are One of the Biggest Failure Points

One of the most common issues with portable dust extractors is incorrect or poor-quality replacement filters.

A filter bought cheaply online may physically fit the machine, but that does not mean it is suitable for the dust being controlled.

Incorrect filters can undermine the whole system. In some cases, the extractor may pick up dust from the floor or tool and then discharge fine particles back into the workplace through the exhaust.

This is a serious issue where workers are exposed to silica, hardwood, MDF, concrete, brick or other harmful dusts.

Filter checks should consider:

• Whether the filter is the correct class for the unit
• Whether it is suitable for the dust hazard
• Whether it is damaged, blocked or poorly seated
• Whether the unit has been maintained in line with manufacturer guidance

Will My Insurance Inspector Test Portable Dust Extractors?

Not always.

Some businesses assume their insurance inspection covers everything related to statutory examination. In practice, many insurance inspections will highlight an issue without carrying out maintenance, filter replacement, blockage clearance or practical remedial work.

For LEV systems, that can leave a gap between being told there is a problem and actually getting the system working correctly again.

Velocity Safety can support with LEV Thorough Examination and Testing, as well as practical advice where airflow, filters, alarms, hoses or indicators need attention.

What Else Counts as LEV?

Portable dust extraction is only one example of LEV.

Other common LEV systems include:

• Fixed extraction arms and hoods
• On-tool extraction units
• Spray booth extraction
• Welding fume extraction
• Bagging-off systems
• Silo vent units
• Dust extraction units in workshops and factories

If a system captures hazardous substances at source, it is likely to need proper maintenance, examination and testing.

COSHH Compliance Is About Control, Not Paperwork Alone

Where portable dust extraction is being used as LEV to control hazardous substances, employers must ensure it is properly maintained, thoroughly examined and tested in line with COSHH Regulation 9.

This is a practical safety issue. Poor airflow, damaged hoses, blocked filters, faulty alarms or incorrect replacement filters can all reduce protection and leave workers exposed.

For employers, the key point is simple: if your extraction equipment is controlling hazardous substances at source, it should not be treated as a basic cleaning vacuum. It needs to be suitable, maintained, checked and properly documented.

For practical usage advice, see our related guide: Portable Dust Extraction Tips for LEV Compliance.

TL;DR

• Portable dust extractors used for on-tool extraction can fall under LEV requirements
• On-tool extraction may require a Thorough Examination and Test under COSHH Regulation 9
• Most LEV systems need testing at least every 14 months
• Higher-risk or heavily used systems may need more frequent checks
• A proper TExT should check airflow, alarms, filters, hoses, seals and overall condition
• Incorrect filters can allow hazardous dust back into the workplace

Get in touch with Velocity Safety for portable dust extraction TExTs and expert LEV compliance support.

FAQs

Here are answers to some of the most common questions we hear about portable LEV systems, dust extraction testing, COSHH requirements and Thorough Examination and Test inspections.

Do portable dust extractors require LEV testing?

Yes, they can. Where a portable dust extractor is being used as on-tool extraction to control hazardous dust at source, it may fall under LEV requirements and require a Thorough Examination and Test under COSHH Regulation 9.

Does on-tool extraction count as LEV?

Yes. The HSE states that on-tool extraction is a form of Local Exhaust Ventilation. If it is being used to control hazardous airborne substances at source, it should be maintained, examined and tested properly.

How often should portable LEV be tested?

In most cases, LEV systems must be thoroughly examined and tested at least every 14 months. Higher-risk applications, heavy use or harsh working environments may require more frequent examination.

Do M-Class and H-Class extractors need a TExT?

If the equipment is being used as part of an on-tool extraction system to control hazardous substances, a Thorough Examination and Test may be required. The class of the unit should match the hazard and the way the equipment is being used.

What is checked during a portable LEV examination?

A competent examiner will typically assess airflow performance, alarms, filters, hoses, seals, damage, suitability for the task and overall effectiveness of the extraction system.

Can incorrect filters make a dust extractor unsafe?

Yes. Incorrect, damaged or poor-quality filters can reduce containment and may allow fine dust to pass back into the workplace. This is a particular concern with silica, MDF, hardwood, concrete and brick dust.

Can Velocity Safety carry out portable LEV testing nationwide?

Yes. Velocity Safety provides LEV Thorough Examination and Test services across the UK, including portable dust extractors, on-tool extraction systems and fixed LEV installations.

Reusable respiratory protection requires ongoing attention – not just a one-off setup.

Whether you’re using tight-fitting face masks, airline-fed systems, or half-masks for spray booths or COSHH controls, RPE must be inspected regularly and thoroughly. We see this missed all the time.

Some companies do basic pre-use checks and think that’s enough. Others send equipment off for servicing once a year. But if your team uses RPE regularly, you need a documented system for monthly examinations if used frequently, or quarterly if used infrequently. Some equipment also requires servicing intervals set by the manufacturer. These requirements sit under COSHH Regulation 9 to ensure safety and compliance.

What Does a Thorough RPE Inspection Involve?

The term “thorough examination” isn’t just a fancier way of saying “have a quick look.” Here’s the inspection flow our technicians follow:

1. Is the Equipment Clean?
   If the RPE shows signs of contamination, it should be quarantined immediately. A competent person must clean and decontaminate it as per the manufacturer’s guidance before any further checks are carried out.
2. Is It Traceable?
   Each item must have a unique ID or reference number. If it doesn’t, it should be clearly marked or tagged to enable tracking, audits, and recordkeeping.
3. Has It Reached Its Service Life?
   If the item has reached its maximum working life (as stated by the manufacturer), it must be destroyed and removed from use. If you don’t know the limit, reference the manual or contact the manufacturer.
4. Has It Been Serviced Within the Right Interval?
   Some RPE has service requirements on top of inspections. If the item hasn’t had its scheduled servicing, it needs to be quarantined until this is resolved.
5. Inspection Process
   The final examination includes visual, tactile, and functional checks. Inspect components, check seals and connections, and (if applicable) remove and clean individual parts before reassembly.

What Happens After the Inspection?

• Fit for Use: The item is labelled, logged, and returned to use with its inspection records updated.
• Fault Found: If the fault can be remedied using genuine parts or manufacturer-approved servicing, the item is repaired and re-inspected. If not, it must be taken out of service permanently.

Want help setting up your inspection records or getting your first batch checked? See our RPE Examination & Servicing and our Respiratory Protective Equipment Inspections pages for what’s included.

Not Just a Box Tick

We often say no to long-term contracts for RPE checks. Why? Because in many cases, the most cost-effective option is to train your own team and implement a basic monthly examination schedule in-house. That said, getting the first thorough examination right is crucial.

When we perform initial inspections, we:

• Assign and label every item with a unique ID for traceability
• Confirm the equipment is suitable for the intended task
• Identify any servicing requirements or arrange servicing if needed
• Set up paperwork and inspection logs to maintain ongoing compliance

This foundation lets most companies manage monthly checks internally while staying safe and compliant.

A Culture of Compliance

We use this same system internally for our own gear. All our reusable masks, valves, hoses, and RPD setups go through the same monthly inspections, with traceable calibration and digital records logged. If your setup includes airline-fed systems, we also provide Breathing Air Purity Testing to keep supplied air within limits.

One Stand. Three Emergencies. Zero Hassle

Most site safety kits are cobbled together from different suppliers, held together with cable ties and crossed fingers. We’re doing things differently.

This all-in-one emergency station was developed for a client who wanted one single unit to cover:

• Fire safety
• Spill response
• First aid provision

…and they didn’t want generic signage or flimsy flatpacks.

Designed With Real Sites in Mind

We built these stations from scratch based on real site needs and industry guidance from organisations like the British Heart Foundation, NetRegs, and the Environment Agency.

Spill Kit Station

• Oil, chemical and AdBlue kits
• Dammit putty for rapid sealing
• Drain mat cover to stop spread
• Emergency PPE kit

First Aid Station

• 50-person first aid kit
• 2 × 500 ml eyewash bottles
• Burns kit
• Defibrillator (optional)

Fire Station

• Interlinked push-button alarm
• 2 extinguishers (Class A + CO₂)
• Fire blanket

For scaffolded construction projects, we can also supply scaffold fire point stands designed to keep extinguishers, alarms and signage accessible at height.

No off-the-shelf product offers this level of integration and customisation – especially when it comes to weatherproofing, signage quality, and compliance with sector-specific risks.

👉 Explore our fire extinguisher servicing options.

Built to Your Site Requirements

• Assembled by our team, not shipped flat-packed
• Custom labelled to suit your site layout, workforce size, and hazards
• Sourced from multiple trusted suppliers for best-in-class components

We don’t believe in a one-size-fits-all approach to emergency prep – and our clients don’t either.

“An inspection booking does not replace a Written Scheme of Examination. The scheme defines what must be examined before the examination takes place.”

An air receiver can be easy to overlook in a busy garage, workshop or factory. Yet if the pressure system needs a Written Scheme of Examination (WSE), that document must be in place before the system is operated.

The scheme identifies the safety-critical parts of the system, the examinations they need and the maximum time between examinations. A competent person must then examine the system in accordance with it.

This guide explains when a scheme may be required, how the 250 bar litre calculation works for compressed-air receivers and what to do if your site has pressure equipment but no current WSE.

Explore Velocity Safety’s PSSR examinations and Written Scheme support.

Jump to:

What Is a PSSR Written Scheme of Examination?

A Written Scheme of Examination is a document setting out how the safety-critical parts of a qualifying pressure system will be examined under the Pressure Systems Safety Regulations 2000 (PSSR).

According to HSE guidance, a suitable scheme typically identifies:

• The equipment and parts of the pressure system covered
• Which parts need examination
• The nature of the examination and any testing of protective devices
• Preparatory work needed to examine the equipment safely
• Any examination needed before first use, where appropriate
• The maximum interval between examinations
• Critical parts that require examination after certain modifications or repairs
• The competent person certifying the scheme and the certification date

The WSE is specific to the pressure system. A generic inspection checklist or an annual compressor service sheet does not establish the scope and examination requirements of that system.

What Does the 250 Bar Litre Rule Mean?

For a compressed-air receiver, multiply the pressure in bar by the receiver’s internal capacity in litres.

For example:

HSE identifies a compressed-air receiver and its associated pipework at 250 bar litres or more as a system likely to require a WSE.

Check the actual receiver details and the wider system rather than estimating from the size of the compressor motor. If there are several vessels, their configuration and the applicable exceptions need proper assessment.

What Equipment May Need a Written Scheme?

Compressed-air receivers are a common reason for garages, engineering workshops and manufacturing sites to need a WSE. HSE also lists examples such as steam boilers, steam sterilising autoclaves, gas-loaded hydraulic accumulators and certain refrigeration and LPG systems.

Whether a particular item needs to be included depends on the pressure system, the fluid it contains, any applicable exceptions and the danger that could result if a part failed.

A scheme may cover:

• The air receiver or other pressure vessel
• Associated pipework where failure could be dangerous
• Protective devices such as safety valves
• Other parts whose failure could release stored energy and cause injury

HSE notes that the compressor associated with an air receiver does not normally need to be included in the WSE itself. This is one reason to define the system and its examination scope accurately rather than calling every part of the installation a “compressor inspection”.

Who Is Responsible for the Written Scheme?

For a fixed pressure system, the user has responsibility for defining which items form the system and which need to be included in the scheme. For a mobile system, that responsibility generally rests with its owner.

They can obtain technical advice when establishing the scope. A competent person must then draw up the WSE or certify a scheme prepared by the user or owner as suitable.

The competent person needs the knowledge, experience and independence appropriate to the system and examination. The user or owner must also ensure that the system is subsequently examined by a competent person in accordance with its scheme.

Read HSE’s guidance on written schemes of examination.

How Often Does a Pressure System Need Examining?

There is no single examination interval that applies to every pressure system. The WSE sets the maximum interval for the relevant parts of that particular system.

The competent person considers factors such as its design, condition, operating environment, previous examination findings and the potential consequences of failure. Different parts may require different examination intervals.

Protective devices should be covered by the scheme. Their correct operation matters because a safety valve that is damaged, obstructed or incorrectly set may fail to protect the system against excess pressure.

The scheme also needs review as the equipment changes or ages. Replacing a vessel, altering the installation or carrying out a significant repair may require the scope or examination arrangements to be reconsidered.

What If Your Site Has No Written Scheme?

First, establish what pressure equipment you have and gather the information needed to assess it:

• Equipment type, manufacturer and model
• Receiver or vessel internal volume
• Operating pressure and safe operating limits
• The fluid or gas in the system
• Details of associated pipework and protective devices
• Previous WSEs, examination reports and maintenance records, if available
• Any modifications, damage or known defects

A competent person can use those details to assess whether a WSE is required and what it must cover.

Where a WSE is required, it must be in place before operation. An examination then needs to be arranged in accordance with it; simply obtaining the document does not complete the examination duty.

Velocity Safety provides pressure-system examinations and support with preparing or reviewing Written Schemes of Examination. See the PSSR service and request an assessment.

Final Takeaway

If you operate a compressed-air receiver, check its pressure and internal volume. A result of 250 bar litres or more is a clear reason to establish its WSE requirements promptly.

For other pressure systems, including steam equipment, do not rely on that calculation alone. Identify the system, check the applicable PSSR requirements and ensure a suitable scheme and the examinations it specifies are in place.

Frequently Asked Questions

What is a Written Scheme of Examination under PSSR?

It is a document identifying the parts of a qualifying pressure system that need examination, the nature of those examinations and the maximum time between them. It must be drawn up or certified as suitable by a competent person.

Does a 250 bar litre air receiver need a WSE?

A compressed-air receiver and its associated pipework with a pressure × internal volume value of 250 bar litres or more are likely to require one. The threshold includes 250; it does not apply only when the calculation exceeds 250.

Does PSSR only apply above 250 bar litres?

No. The pressure-volume exception concerns particular requirements for certain non-steam systems. It does not describe the whole scope of PSSR, and steam systems require separate assessment.

Does a small air compressor need a Written Scheme?

It depends on the receiver, operating pressure, system arrangement and applicable exceptions. Check the internal receiver volume and pressure rather than judging by the physical size or motor rating alone.

Does the compressor itself go in the WSE?

Not normally when it is associated with an air receiver, according to HSE guidance. The receiver, relevant pipework and protective devices may need to be covered. The competent person should assess the particular system.

Who can prepare a Written Scheme of Examination?

A competent person can draw up the scheme, or the user or owner can prepare one for a competent person to certify as suitable. The person selected must have appropriate knowledge, experience and independence.

How often must a PSSR examination take place?

The WSE specifies the maximum interval for the relevant parts of the system. There is no universal annual examination date for every pressure system.

Is a compressor service the same as a PSSR examination?

No. Routine servicing helps maintain the equipment. A PSSR examination is performed by a competent person in accordance with the Written Scheme and addresses the parts identified by that scheme.

Can Velocity Safety help if we do not have a WSE?

Yes. Velocity Safety offers PSSR examination services and support with preparing or reviewing Written Schemes. Provide the equipment details and any existing documents when requesting an assessment.

Resources

• • HSE – Written Schemes of Examination
  • HSE – Using Pressure Systems
  • HSE – Safety of Pressure Systems: Approved Code of Practice L122

Off-the-Shelf Isn’t Always Enough

When it comes to emergency preparedness, most stands and signage kits fall short. The templates are basic, the materials aren’t built for site use, and the guidance often lacks practical relevance.

That’s why one of our recent clients approached us to design a bespoke set of emergency stations – covering spill response, first aid, and fire – with signage based on real-world safety standards.

What We Delivered

We created a tailored demo setup with:

• Custom spill kit signage informed by NetRegs and the Environment Agency
• First aid posters built on British Heart Foundation guidance
• Fire point stations and scaffold-mounted fire points with compliant extinguishers, alarms and custom vinyl labels
• Fully assembled, weather-resistant frames – no flatpack setup required

Each poster was designed to actually help in an emergency – not just tick a visual box.

Spill Response: More Than Just a Kit

Most spill signage skips the details that matter. This client wanted to help site teams plan ahead for:

• Oil, chemical, AdBlue, and maintenance spills
• IBC and container leaks (what happens when there’s no putty?)
• Drain protection and environmental containment
• Clear escalation procedures for when a small spill turns into a bigger issue

We built the signage around site-specific needs, not generic boilerplate.

Some clients also use RPE as part of their spill response kit – especially when handling ammonia-based or chemical products. We can provide RPE Examination & Servicing and Respiratory Protective Equipment Inspections to ensure your team are using the correct masks with verified fit.

Want One for Your Site?

We build emergency stations that actually work – for civils, construction, manufacturing, utilities, and events.

Whether you need a custom layout, better signage, or a full fire/spill/first aid station rollout, we’ll help you make it happen. If your project requires dedicated fire points, we also supply scaffold fire point stands alongside Fire Extinguisher Servicing & Maintenance and Fire Extinguisher Disposal with full certification.

The wrong extinguisher in the wrong place can cost you money, compliance, and real protection when it counts.

We recently came across a purple-labelled Class D extinguisher sat next to a warehouse packing station. For those not fluent in extinguisher types – that’s meant for specialist metal fires. Not cardboard, not packaging, and definitely not day-to-day risks.

Cost to the client? Likely £250+. Coverage provided? Close to zero.

Why It Happens

Too often, fire safety is handled by contractors who don’t listen to the environment they’re installing into – or simply reuse stock they’re trying to shift. It’s a dangerous practice that can lead to:

• Equipment being completely ineffective in an emergency
• Compliance breaches under BS 5306-8
• Wasted spend on over-specified or unsuitable kit
• False confidence among staff and safety leads

What Should’ve Been Installed?

For general fire risks (e.g. cardboard, paper, packaging), the typical extinguisher choices are:

• Water or Foam for Class A fires
• CO₂ for electrical risks
• ABC Dry Powder only in open/outdoor areas (due to visibility and inhalation risks)

Each extinguisher type has a specific use case – and BS 5306 outlines clear placement guidance.

How We Handle It

At Velocity Safety, we install fire extinguishers that match the risks – and label, commission, and site them in line with BS 5306. No mystery metals. No leftover stock. Just the right kit for the job.

We keep your extinguishers compliant through routine servicing, audits, and maintenance as your site changes. Whether you’re based in:

• Manchester
• Accrington & Hyndburn
• Preston
• Blackburn with Darwen
• Blackpool & the Fylde Coast
• Burnley & Pendle
• Bury
• Bolton
• Rochdale
• Oldham

Our engineers provide local support backed by full compliance and certification.

Got the wrong extinguisher type sitting on site? Or expired units gathering dust? We can remove and dispose of them safely, with full paperwork included.

👉 Learn more about our Fire Extinguisher Servicing process
👉 See how our Fire Extinguisher Disposal service works

We’ve carried out breathing air testing for several years – but we’ve now upgraded to a digital unit to give our clients even more traceability, speed, and accuracy.

New Equipment

We’ve recently added the Factair F6000 to our kit. This unit allows us to test air purity from:

• 230 & 300 Bar cylinders
• Direct from compressors
• Airline-fed breathing apparatus systems

It also eliminates the need for Draeger tubes – removing the risks of glass breakage or contamination and improving digital recordkeeping for audits and compliance.

Why Breathing Air Testing Matters

If workers use supplied-air Respiratory Protective Equipment (RPE), the compressed breathing air must meet the relevant quality requirements, including BS EN 12021. Under COSHH, employers must ensure control measures and respiratory protective equipment remain suitable and properly maintained.

Breathing-air quality should be tested at least every three months, and more frequently where the risk assessment indicates contamination could occur within that period.

Poor air quality can be caused by:

• Compressor contamination
• Oil or moisture ingress
• Incorrect flow rates
• Damaged filtration systems

If your setup includes airline-fed Respiratory Protective Equipment (RPE), the employer must ensure the supplied air is suitable and the equipment is properly selected, maintained, examined and tested where appropriate.

Alongside regular air testing, it’s worth scheduling a thorough inspection of your RPE to check for wear, damage, and performance issues.

How We Help

Velocity Safety provides traceable breathing air purity testing across the UK. With our upgraded equipment, we can test pressure-fed systems, cylinders, and airline setups on-site – quickly, cleanly, and with digital records for your file.