Fire extinguishers are an effective means of containing and extinguishing fires, but only when they are properly maintained, fully charged, and in good working condition. If extinguishers are not adequately maintained, lack sufficient agent, or are faulty, they may fail in an emergency. In such cases, they offer little to no protection.  Manufacturer’s instructions and British Standard BS 5306-3 provide guidance on the steps you and your competent person should be taking to ensure they are fit for purpose. 

Below are key signs that your fire extinguishers may need replacing and you should look for in your inspection steps (Clause 11.2 BS 5306-3: 2017 FIA have produced a simple infographic which highlights these, you can download it here). 

1. Low or no pressure 

Check the pressure gauge regularly. If the needle is in the red zone, the extinguisher may not operate effectively. A correctly functioning extinguisher should always indicate pressure within the green zone. Green means ready for use, while red indicates recharge is required. 

2. Physical damage 

An extinguisher should be replaced if any of the following are present: 

• Dents, rust, or corrosion  
• A leaking or cracked hose or nozzle  
• A broken handle or missing safety pin  

Any of these defects may cause the extinguisher to fail during operation. 

3. Leaking or broken seals 

If tamper seals are missing or damaged, this may indicate the extinguisher has been used or compromised. This can result in a loss of pressure, reducing the extinguisher’s ability to discharge effectively. 

4. Expired or missing inspection tags 

If regular inspections have not been carried out, or if the inspection tag is missing, the extinguisher’s reliability cannot be assured. Regular inspection, proper record keeping, and prompt replacement of non-compliant units are essential to maintaining safety. 

5. Previous use 

Even if an extinguisher has only been used briefly, it should be recharged or replaced immediately. This ensures sufficient capacity is available in the event of a fire. 

What to do if a fault is identified 

If any of the above issues are identified, and you have a service contract then contact your service provider, otherwise arrange for safe disposal of the extinguisher (see Disposal of fire extinguishers) and supply of a suitable replacement. When purchasing a replacement, it is advisable to ensure the unit is fully charged, undamaged, and compliant with relevant standards. 

Regular servicing is essential. It enables faults to be identified early and ensures extinguishers remain reliable in an emergency. 

Proper maintenance not only extends the lifespan of extinguishers but is also more cost effective and environmentally responsible. A proactive approach to fire safety is key to protecting both people and property. 

Servicing requirements 

Annual servicing 

All extinguishers should be inspected by a competent person at least annually in accordance with the recommendation of BS 5306-3 and manufacturer’s instructions (Note some manufacturers have specific instructions related to the servicing of their extinguishers). This includes: 

• Checking the pressure gauge, safety pin, hose, and inspection tags  
• Verifying the weight and condition of the extinguisher  
• Inspecting for visible damage, such as dents, corrosion, or tampering  

All findings should be recorded to identify trends or recurring issues, such as environmental factors affecting performance. 

Extended servicing (every 5 years) 

Stored pressure extinguishers, such as water, foam, powder, and wet chemical types, require periodic extended servicing. This includes: 

• Discharging and refilling the extinguisher  
• Inspecting internal components  
• Ensuring the discharge path is clear of blockages, for example debris or insects  

CO₂ extinguisher servicing  

CO₂ extinguishers require overhaul at 10-year intervals. This includes: 

• Hydraulic, or hydrostatic, pressure testing of the cylinder  
• Replacement of the main valve  
• These tests ensure the extinguisher body can safely withstand operational pressures. 
• Regular servicing is essential to ensure extinguishers operate at optimum performance. In an emergency, reliability is critical. 

Additional considerations 

It is important that responsible persons are aware of key information, including: 

• The manufacture date, usually marked on the body or label  
• The commissioning date  
• The date of the last service  

This information helps ensure compliance and supports effective maintenance planning. 

Extending the lifespan of fire extinguishers 

Routine visual inspections should be carried out regularly, for example weekly or monthly. These should check for: 

• Visible damage, such as dents or corrosion  
• Signs of tampering  
• Correct pressure levels  

Regular checks help identify issues early, preventing more serious problems from developing. 

Additionally, extinguishers should always be: 

• Located correctly  
• Easily accessible  
• Clearly visible  

While maintenance can extend the lifespan of extinguishers, there will come a point where replacement is more appropriate and cost effective. 

• Disposal of fire extinguishers 

Expired or damaged extinguishers must not be retained. Faulty units may fail to operate correctly or, in some cases, may present additional risks such as rupture under pressure. 

Fire extinguishers are classified as hazardous waste and must be disposed of responsibly. Improper disposal can result in environmental harm or risk to the public. 

Where there is uncertainty, advice should be sought from a competent professional. Suitable disposal options may include: 

• Approved recycling centres  
• Hazardous waste facilities  
• Specialist fire safety service providers  

All servicing, maintenance, and disposal activities should be carried out by a suitably qualified and a competent person.  

Conclusion 

By following this guidance, you can identify when fire extinguishers require replacement, understand servicing requirements, and take appropriate steps to maintain them effectively. 

Regular inspection and maintenance are essential to ensuring fire extinguishers perform as intended. When properly maintained, they remain a vital and reliable tool in fire protection.