Fire suppression system testing is not simply an annual box-ticking exercise. Different parts of a system need to be inspected, measured or tested at different intervals depending on the type of suppression system, extinguishing agent, protected environment, manufacturer guidance and the standards that apply.
For gaseous fire suppression systems, checks on cylinder contents and pressure may be required at least every six months, while more extensive system inspections are generally carried out annually. Room integrity also needs to be assessed regularly, while changes to the protected enclosure can trigger the need for additional testing.
The important point is that there is no single testing interval that applies to every fire suppression system.
Coltraco Ultrasonics does not carry out routine fire suppression system servicing. Instead, we manufacture non-invasive testing and monitoring equipment used by fire-safety professionals to verify important aspects of system readiness, including suppression agent quantity, inert-gas pressure, room integrity and liquid flow.
How Often Should Different Parts of a Fire Suppression System Be Checked?
A testing schedule should always be based on the applicable standard, system manufacturer requirements, risk assessment and advice from a competent fire-safety professional.
For gaseous suppression systems, a typical schedule may include:
| Check | Typical Frequency | How Coltraco Supports It |
| Liquefied suppression agent quantity | At least every 6 months where required by standards such as ISO 14520 or NFPA 2001 | Portalevel® liquid level indicators and Portasteele® CALCULATOR |
| Inert-gas cylinder pressure | At least every 6 months where required by the applicable standard | Portagas® |
| Full suppression system inspection | Typically at least annually | Carried out by a competent fire-safety professional; Coltraco does not provide this servicing |
| Protected enclosure integrity | Commonly every 12 months and following relevant changes to the enclosure | Portascanner® and Portascanner® AIRTIGHT support leak detection and remedial work |
| Sprinkler, hydrant or deluge flow measurement | According to the relevant maintenance standard and system requirements | Portasonic® ultrasonic flow meters |
| Cylinder contents monitoring between inspections | Continuous | PermaMass® FEATHERWEIGHT |
For premises in England and Wales, the Regulatory Reform (Fire Safety) Order 2005 requires appropriate fire-safety measures to be maintained. Government guidance states that this involves regular inspection, testing and servicing of fire-safety systems and that people carrying out testing and maintenance must be competent to do so.
Why Regular Fire Suppression System Testing Matters
A suppression system needs to be capable of performing as designed when a fire occurs.
For gaseous suppression systems, seemingly small changes can affect performance. A cylinder could gradually lose extinguishing agent, an inert-gas cylinder could lose pressure, or new openings in a protected enclosure could allow discharged agent to escape too quickly.
Water-based systems also depend on sufficient flow through the pipework when activated.
Regular inspection and measurement can therefore help identify changes before they affect fire protection.
The exact checks required will depend on the installation, but areas that may need verification include:
- suppression agent quantity
- cylinder pressure
- protected enclosure integrity
- liquid flow rate
- pipework and system condition
- detection, activation and control equipment
Coltraco’s role is focused specifically on measuring and monitoring several of these conditions without unnecessarily disconnecting, draining or interfering with the system.
How Often Should Fire Suppression Cylinder Contents Be Checked?
Gaseous suppression systems rely on the correct quantity of extinguishing agent being available when a discharge occurs.
Standards including ISO 14520 and NFPA 2001 include requirements for periodic checks of agent quantity. NFPA 2001, for example, requires records of semi-annual checks of clean-agent quantity and pressure, while ISO 14520 also specifies six-monthly container-content checks.
For liquefied agents, one traditional method is to disconnect and physically weigh the cylinder. This can take time, particularly where a facility contains a large bank of cylinders.
The Portalevel® MAX PLUS provides another method.
It uses ultrasound to identify the gas/liquid interface inside a liquefied fire suppression cylinder from outside the cylinder wall. This allows technicians to establish the liquid level without disconnecting the cylinder.
Portalevel® MAX PLUS is UL listed and designed for liquefied fire suppression agents including CO₂, FM-200® and NOVEC™ 1230. Coltraco states that its non-invasive measurement method supports requirements for verifying clean-agent quantity during semi-annual inspections.
Converting Liquid Level Into Agent Weight
It is important to distinguish liquid-level measurement from cylinder weighing.
Portalevel® identifies the liquid level. It does not directly weigh the suppression agent.
Where the agent mass needs to be established and compared against the cylinder’s recorded fill weight, the Portasteele® CALCULATOR can be used alongside a Portalevel® measurement.
The calculator uses information about the cylinder, agent, liquid level and temperature to calculate the corresponding agent weight. This provides traceability to the documented fill weight without requiring the cylinder itself to be physically weighed.
How Often Should Inert-Gas Cylinder Pressure Be Checked?
Non-liquefied inert-gas suppression systems require a different approach.
Systems using gases such as Inergen®, nitrogen or argon do not contain a liquid level that can be located in the same way as liquefied clean agents. Instead, pressure provides an indication of the quantity of gas remaining in the cylinder.
ISO 14520 requires periodic monitoring of non-liquefied gaseous extinguishing agents, with pressure adjusted for temperature when determining whether a loss has occurred.
Portagas® has been developed specifically for non-invasive monitoring of pressurised non-liquefied gas cylinders.
The instrument compares pressure against a known value while accounting for temperature, helping technicians determine whether a change is caused by normal temperature variation or potential agent leakage.
This makes Portagas® particularly relevant to periodic checks of inert-gas suppression cylinders without penetrating, venting or disconnecting the cylinder.
How Often Should Room Integrity Be Tested?
For total-flooding gaseous suppression systems, the cylinder is only one part of the equation.
The protected room or enclosure must also retain the extinguishing agent for long enough to achieve the required concentration and hold time.
Openings around doors, cable penetrations, walls, raised floors, ceilings and building services can affect this.
Guidance from the Fire Industry Association states that room integrity testing should form part of the maintenance schedule and generally be repeated every 12 months, unless documentary evidence confirms that no changes have occurred to the protected enclosure. Changes to the room can also create a need for additional testing.
A Door Fan Test is commonly used to assess the enclosure as a whole.
Coltraco’s ultrasonic technology serves a different but complementary purpose.
Finding Air Leaks With Portascanner®
Portascanner® can be used to identify and locate individual air leak sites within a room or compartment.
This can help fire-safety professionals locate problem areas before a formal integrity test, investigate the source of leakage following an unsuccessful test or monitor an enclosure between scheduled integrity assessments.
It does not automatically replace a Door Fan Test where a pressurisation test is required. Instead, it provides additional information about where leakage is occurring.
Locating and Quantifying Leakage With Portascanner® AIRTIGHT
Where more detailed leakage information is needed, Portascanner® AIRTIGHT can locate and quantify individual leaks.
The instrument can collect information from multiple leak sites and provide an indication of their impact on the airtightness of the room.
This can support remedial air sealing and help technicians understand where enclosure performance may be compromised before or alongside required integrity testing.
How Often Should Sprinkler and Deluge Flow Be Tested?
Water-based fire-protection systems have their own inspection, testing and maintenance requirements.
The correct schedule depends on the type of installation and the standards governing the sprinkler, hydrant or deluge system. System servicing can include checks of pumps, valves, alarms, sprinkler components and other equipment.
These tasks fall outside Coltraco’s role.
Where liquid flow rate needs to be measured, however, the Portasonic® PLUS provides a non-invasive method of checking flow through pipework.
The sensors attach externally to the pipe and use ultrasonic transit-time measurement to determine flow rate. Because the instrument clamps onto the outside of the pipe, measurement can be taken without installing an inline flow meter or cutting into the pipework.
Coltraco has used Portasonic® technology for fire sprinkler flow measurement applications, making it relevant where servicing engineers need to verify actual flow as part of a wider inspection or testing programme.
Portasonic® should therefore be viewed as a measurement tool within a wider fire-protection maintenance procedure, rather than as a substitute for sprinkler system servicing.
What Happens Between Scheduled Inspections?
A periodic inspection confirms the condition of a system at the point when the check is carried out.
It cannot guarantee that a leak will not develop days, weeks or months later.
This is particularly important for suppression cylinders protecting critical assets or facilities where an undetected loss of agent could leave the protected area without its intended level of fire protection.
Permanent monitoring can help close this gap.
PermaMass® FEATHERWEIGHT continuously monitors the mass of fire suppression cylinder contents.
It is designed for CO₂, clean-agent and inert-gas systems and can detect changes in agent mass. For suitable inert-gas applications such as Inergen®, it can also convert mass loss into an associated percentage pressure loss.
Unlike a handheld inspection carried out on a scheduled date, this gives operators ongoing information about cylinder contents.
Permanent monitoring does not remove the need for required inspections and servicing. Instead, it can provide an additional layer of condition monitoring between scheduled visits.
Who Should Test a Fire Suppression System?
Inspection and maintenance requirements should be managed by the building owner, operator or other party responsible for fire safety at the premises.
In England and Wales, the Fire Safety Order places duties on the Responsible Person to put appropriate fire precautions in place and maintain them. Government guidance also makes clear that people appointed to carry out testing and maintenance need to be competent.
This distinction is important when considering Coltraco’s products.
Coltraco supplies testing and monitoring technology. It does not replace the competent fire-safety professional responsible for inspecting, maintaining or servicing the suppression system.
Its equipment can support those professionals by providing accurate measurements in areas such as:
- liquefied suppression agent level
- calculated agent weight
- inert-gas pressure
- enclosure leakage
- fire-protection liquid flow
- continuous cylinder contents monitoring
These measurements can then form part of the wider inspection, maintenance and record-keeping process.
Why Non-Invasive Measurement Can Improve Fire Suppression System Testing
Many traditional testing methods involve physically interacting with the system being checked.
For example, establishing the contents of a suppression cylinder may involve disconnection and weighing, while flow measurement can involve permanently installed equipment within the pipe network.
Non-invasive measurement gives fire-safety professionals another option.
Portalevel® can identify liquid level from outside the suppression cylinder. Portagas® can assess pressure in non-liquefied inert-gas cylinders. Portasonic® can measure liquid flow externally through pipework, while Portascanner® can locate leakage without pressurising the enclosure.
The result is not a replacement for proper fire-system servicing. It is a way of obtaining important measurements with less interference with the systems being inspected.
How Coltraco Supports Fire Equipment Servicing Professionals
Coltraco Ultrasonics develops testing and monitoring equipment used by fire-equipment servicing companies, engineers, facilities teams and other professionals responsible for fixed fire suppression systems.
Our fire-safety range includes:
- Portalevel® – non-invasive ultrasonic liquid-level measurement for liquefied fire suppression cylinders.
- Portasteele® CALCULATOR – converts Portalevel® liquid-level measurements into calculated agent mass.
- Portagas® – non-invasive pressure monitoring for non-liquefied inert-gas cylinders.
- Portascanner® – ultrasonic identification and location of air leakage in protected enclosures.
- Portascanner® AIRTIGHT – leak location and quantification for more detailed enclosure analysis.
- Portasonic® – external ultrasonic measurement of liquid flow through pipework.
- PermaMass® FEATHERWEIGHT – continuous cylinder contents monitoring between scheduled inspections.
Together, these technologies help professionals verify specific conditions that can influence suppression-system readiness without suggesting that one instrument replaces the full inspection and maintenance procedure.
For more information, explore our fire safety equipment servicing solutions.
Plan Fire Suppression System Testing Around the System You Have
So, how often should a fire suppression system be tested?
There is no single answer for every installation.
Clean-agent and inert-gas cylinder quantity checks may be required every six months. A full system inspection may be required annually. Room integrity should be reviewed regularly and after relevant changes to the protected enclosure, while water-based systems have their own schedules for inspection, maintenance and flow testing.
Always follow the standards that apply to your particular installation, the fire suppression system manufacturer’s instructions, the site fire-risk assessment and the advice of a competent fire-safety professional.
Coltraco’s role is to give those professionals accurate ways to measure and monitor the condition of key parts of the system.
For further guidance on the areas that may need to be checked, read our fire suppression system maintenance checklist or view our fire safety equipment servicing range.
FAQs
Does Coltraco carry out fire suppression system servicing?
No. Coltraco manufactures testing instruments and permanent monitoring systems used by fire-equipment servicing companies, engineers and other competent professionals.
Coltraco also provides product training, calibration and technical support for its equipment, but the instruments do not replace the professional inspection or maintenance of the fire suppression system itself.
How often should clean-agent cylinder contents be checked?
Standards including ISO 14520 and NFPA 2001 include six-monthly checks of suppression-agent quantity for relevant gaseous fire extinguishing systems. The exact requirements should always be confirmed against the standard and system that applies to the installation.
Can fire suppression cylinders be checked without weighing them?
For suitable liquefied gaseous suppression agents, yes.
The Portalevel® range uses ultrasound to identify the liquid level from outside the cylinder without disconnecting it. The resulting liquid-level measurement can then be used with Portasteele® CALCULATOR to calculate the corresponding agent mass.
Can inert-gas cylinders be checked without disconnecting them?
Portagas® is designed to monitor pressure in pressurised non-liquefied gas cylinders non-invasively. It accounts for temperature changes so that technicians can distinguish normal pressure variation from potential loss of agent.
Does Portascanner® replace a Door Fan Test?
Not where a formal pressurisation or enclosure integrity test is required.
Portascanner® is used to locate individual leakage sites and can support preparation for, or investigation following, a Door Fan Test. Portascanner® AIRTIGHT can provide further information by quantifying individual leakage sites.
Can fire suppression cylinders be monitored continuously?
Yes. PermaMass® FEATHERWEIGHT is designed for constant monitoring of cylinder agent mass in suitable CO₂, clean-agent and inert-gas systems. This can provide additional visibility of agent loss between scheduled manual inspections.
Does Coltraco offer equipment for hazardous areas?
Yes. Portalevel® IS is an intrinsically safe ultrasonic liquid-level indicator designed for suitable fire suppression cylinder applications in Zone 1 and Zone 2 ATEX and IECEx environments.
