Special Hazard Fire Suppression Systems Logbook

AS 1851—2012 Section 7 Routine Service Records for Gaseous, Aerosol and Open Nozzle Water Mist Systems

Special hazard fire suppression systems are designed to protect specific hazards, equipment and areas that require a specialised extinguishing arrangement. Depending on the installation, these systems may use gaseous extinguishing agents, fixed aerosol generators or open nozzle water mist.

Unlike a simple equipment inspection, servicing a special hazard system may involve checking extinguishing-agent storage containers, release mechanisms, discharge pipework, nozzles, protected enclosure conditions and interfaces with other building systems.

The Special Hazard Fire Suppression Systems Logbook from Fire Factory Australia provides dedicated hardcopy records for documenting these activities.

Developed around the applicable requirements of AS 1851—2012 (Incorporating Amendment No. 1), Section 7 – Special Hazard Systems, the logbook includes Monthly, Six-Monthly, Yearly and Ten-Yearly routine service records.

It also provides dedicated fields for container charge measurements, enclosure integrity testing, pressure-relief vent operation, container inspection dates, defects and corrective actions.

Explore the Special Hazard Fire Suppression Systems Logbook 

What Are Special Hazard Fire Suppression Systems?

Special hazard fire suppression systems are purpose-designed installations intended to protect particular risks or protected areas.

They may incorporate specialised extinguishing agents, storage containers, detection equipment, release mechanisms, distribution pipework, nozzles and pressure-relief arrangements.

AS 1851—2012 Section 7 addresses three principal categories:

Each system type has its own applicable components and service activities.

The Special Hazard Logbook brings these records together while retaining the relevant system-specific checks.

What Does the Special Hazard Logbook Cover?

The logbook provides structured service records for applicable equipment and functions, including:

• Gaseous suppression systems and extinguishing-agent storage containers

• Fixed aerosol generators and moisture seals

• Open nozzle water mist equipment

• Container pressure and extinguishing-agent charge

• Mechanical and pneumatic detection

• Manual release systems and actuators

• Lock-off, directional and check valves

• Discharge pipework, flexible connectors and manifolds

• Discharge nozzles

• Pressure-relief devices

• Protected-area conditions and enclosure integrity

• Ventilation dampers and HVAC interfaces

• Post-discharge ventilation

• Water mist pumps, water supplies and air compressors

• Water additives, strainers and water containers

The service sheets provide Pass, Fail and N/A results, together with fields for defects, comments, corrective actions and completed repairs.

Special Hazard System Service Frequencies

The logbook contains four dedicated routine service schedules.

The activities that apply at each interval depend on the installed system and its relevant requirements. Not every checklist item will apply to every gaseous, aerosol or water mist installation.

Monthly Special Hazard System Service Records

The Monthly Service Record is based on AS 1851—2012 Table 7.4.2.

It includes applicable checks of storage containers, release equipment, warning signs, protected-area conditions and system-specific components.

Storage Container Condition and Pressure

The Monthly Schedule includes checking that storage containers are secure, accessible, undamaged and correctly mounted.

Where a pressure indicator is fitted, the source schedule specifies checking that pressure loss is not greater than 10% of nominal charge pressure.

Where no pressure indicator is fitted, the system discharge indicator is checked to confirm that it has not operated.

Recording these checks provides a service history of the storage arrangement.

Release Mechanisms and Lock-Off Valves

The Monthly Schedule includes inspection of:

• Anti-tamper seals and pull pins

• Gas-container valves

• Actuators and drop weights

• Release mechanisms

• Lock-off valves

Applicable checks address accessibility, damage, obstruction and identification.

Protected Area Inspection

Changes to a protected area may affect the assumptions used in the suppression-system design.

The Monthly Schedule includes checking for changes to the protected risk, including enclosure volume, fuel type and use of the protected area.

These checks are particularly relevant to total flooding systems, where changes to the enclosure can affect extinguishing-agent concentration and retention.

Monthly Fixed Aerosol System Checks

Additional monthly activities for fixed aerosol systems include confirming that:

• Aerosol generators have not discharged.

• Generators remain secure.

• Moisture seals remain secure.

Monthly Open Nozzle Water Mist Checks

Water mist-specific activities include checking pressure regulators, pumps, water supplies and air compressors.

Where air receivers form part of the installation, the schedule also includes compressor cut-in and cut-out pressurechecks.

Where separate pump servicing is required, those activities are documented in the relevant pump service record.

Electrical Detection and Control Equipment: Section 6 and Section 7

Special hazard suppression systems may incorporate electrical detection and control equipment that detects a fire, supervises the system or initiates discharge.

The supplied product information identifies an important distinction: applicable electrical detection and control equipment is serviced under Section 6 in addition to the relevant Section 7 requirements.

The Special Hazard Logbook provides records for suppression-system activities under Section 7. It directs technicians to document applicable electrical detection and control servicing in the relevant logbook.

Fire Factory Australia provides a separate Fire Detection & Alarm Systems Logbook  for applicable Section 6 records.

The Special Hazard Logbook should therefore not be treated as a replacement for every service record associated with the installation.

Six-Monthly Special Hazard System Service Records

The Six-Monthly Service Record is based on AS 1851—2012 Table 7.4.3.

It covers applicable mechanical and pneumatic detection, manual release equipment, distribution components, valves, storage-container charge and additional water mist activities.

Mechanical and Pneumatic Detection

The schedule includes inspection of mechanical and pneumatic detection equipment for conditions that may affect performance.

Applicable automatic mechanical detection arrangements, including fusible-link systems, are functionally tested to verify the required warning and ability to initiate suppression-system discharge.

Pneumatic control piping and fittings are also checked for integrity and correct operation.

Manual Release System Testing

Manual release equipment provides another means of initiating the suppression system.

The Six-Monthly Schedule includes functional testing of applicable manual release systems. Results, defects and corrective actions can be documented against the relevant service item.

Discharge Pipework, Manifolds and Nozzles

The distribution-system inspection covers applicable:

• Pipework

• Flexible connectors

• Manifolds

• Discharge nozzles

• Aerosol generators

Pipework, connectors and manifolds are checked for damage and adequate support.

Discharge nozzles are checked to confirm that they remain clear, unobstructed, correctly aimed and secure.

Storage Container Charge Records

The Six-Monthly page provides dedicated recording space for up to nine storage containers.

Where applicable, charge is verified by weighing or liquid-level determination.

The logbook provides measurement fields in kg / mm.

The supplied service schedule identifies the following charge-loss criteria:

These fields allow technicians to retain and compare container charge measurements across service visits.

Additional Six-Monthly Water Mist Activities

Applicable water mist activities include cycling the system through a complete discharge cycle and completing the required pump and valve routine servicing.

Where separate pump records are required, the appropriate pump logbook is used rather than duplicating the full pump schedule in the Special Hazard Logbook.

Yearly Special Hazard System Service Records

The Yearly Service Record is based on AS 1851—2012 Table 7.4.4.

It provides a more detailed assessment of the suppression system, its components and the hazard it protects.

The schedule includes activities relating to:

• Gas-container pressure-test and inspection dates

• Mechanical actuators, detection and release equipment

• Detection-device and pyrotechnic actuator service life

• Nozzle and damper cleaning

• Inadvertent-discharge risks

• Fuel class and hazard type

• Enclosure volume

• Design concentration or application density

• Protected-object dimensions

• Enclosure integrity

• Pressure-relief vents

• Ventilation and HVAC interfaces

• Directional valves

• Other interfaced fire systems

Additional activities apply to fixed aerosol and open nozzle water mist installations.

Gas Storage Container Inspection Dates

The Yearly Service Record includes fields for recording the last pressure-test or inspection date of up to nine gas storage containers.

These records help technicians identify containers that may become due for their Ten-Yearly pressure test or inspection before the next scheduled Yearly service.

Mechanical Actuators and Release Equipment

The Yearly Schedule includes checking and, where necessary, lubricating applicable mechanical actuators, release systems and detection equipment.

It also addresses detection devices, sensing elements and pyrotechnic actuators that may reach the end of their specified service life before the next scheduled service.

Hazard and Protected Area Verification

The Yearly Schedule includes verification of the actual hazard and protected area against the system’s design requirements.

Applicable checks address:

Changes to the protected area or hazard may affect the suitability of the installed suppression system.

Gaseous Suppression Enclosure Integrity Test Records

For applicable gaseous total flooding systems, the Yearly Service Record includes an enclosure integrity test.

The logbook provides dedicated measurement fields:

These measurements document the enclosure conditions relevant to extinguishing-agent retention.

Where an integrity test cannot be conducted because of conditions such as dimensional constraints or large openings that cannot be closed, the supplied schedule provides for assessment through the applicable alternative inspection process.

Pressure-Relief Vent Test Records

Where a pressure-relief vent is fitted, the Yearly Schedule includes testing and recording its operating pressure.

The logbook provides four dedicated measurement positions in Pa.

This allows actual operating pressures to be documented rather than recording only a Pass or Fail result.

Ventilation, HVAC and System Interface Testing

Special hazard suppression systems may interact with ventilation equipment and other fire protection systems.

The Yearly Schedule includes applicable checks of automatically operated ventilation dampers, HVAC interfaces, post-discharge ventilation, directional valves and other interfaced fire systems.

Functional testing verifies that the required interface functions operate correctly.

These records concern the relevant suppression-system functions. Broader servicing of mechanical fire and smoke-control equipment may require separate records.

For applicable mechanical services, see the Mechanical Services Logbook – Fire/Smoke Control Features .

Yearly Fixed Aerosol System Records

The Yearly Schedule includes an additional service-life check for fixed aerosol systems.

Aerosol generators that will exceed their specified service life before the next scheduled service are identified for replacement.

This complements the monthly checks of generator discharge status, security and moisture seals.

Yearly Open Nozzle Water Mist Records

The Yearly Schedule includes additional activities for applicable open nozzle water mist systems:

• Full-flow testing to verify water supply pressure and flow

• Checking water-additive concentration, where applicable

• Checking and cleaning line strainers

• Checking nozzle strainers where their condition indicates it is necessary

• Draining and inspecting the internal condition of water containers

• Refilling containers and replenishing additives where required

Associated pump servicing is documented in the relevant pump service record where required.

Ten-Yearly Special Hazard System Service Records

The logbook includes a dedicated Ten-Yearly Service Record based on AS 1851—2012 Table 7.4.5.

It addresses three significant long-term activities.

Discharge Nozzle Flow Testing

Each applicable nozzle is tested for free and unobstructed flow using a continuous flow of nitrogen or another suitable alternative.

Gas Storage Cylinder Pressure Testing

Applicable transport-type gas storage containers, such as cylinders, that have exceeded ten years since their last test are subject to the relevant hydrostatic pressure test.

Engineered Pressure Vessel Inspection

Applicable engineered pressure vessels, such as certain low-pressure CO₂ storage vessels, are subject to internal inspection.

The supplied schedule identifies ten-year intervals for the relevant pressure tests and internal inspections, with initial timing determined from the applicable first-fill or manufacture date.

Defects, Corrective Actions and Completed Repairs

Each routine service section provides structured fields for:

Item No. | Defect Type | Results / Comments | Corrective Action | Completed Repairs

A separate Notes page also provides space for the associated Logbook Sheet ID or Report Number, activity performed, additional defects, comments, corrective actions and completed repairs.

These records help establish a history from the initial inspection or test through to defect identification and subsequent rectification.

Site, Technician and Service Provider Information

Each service record includes fields for the site name, address, site ID, work order number, service provider, service date, technician name, licence number and relevant signatures.

The logbook uses three-part NCR service sheets:

This format provides a physical service record for the responsible entity, the service provider and the on-site logbook.

AS 1851—2012 Section 7 and Related Service Requirements

AS 1851—2012 Section 7 addresses routine servicing of gaseous, fixed aerosol and open nozzle water mist special hazard suppression systems. It is read together with the general requirements in Section 1.

Some pre-engineered special hazard systems may be covered by other specific standards. Section 7 should not automatically be treated as the sole servicing basis for every type of special hazard installation.

Similarly, associated electrical detection equipment, pumps or mechanical systems may require additional records under their relevant servicing requirements.

The Special Hazard Logbook is a record-keeping tool. It does not replace the Standard or guarantee that every applicable requirement is contained within the publication.

AS 1851—2012 Requirements in NSW

According to the NSW regulatory information cited in the supplied article, from 13 February 2026, applicable essential fire safety measures in new and existing Class 1b and Class 2–9 buildings must be maintained in accordance with AS 1851—2012, subject to applicable alternative maintenance arrangements specified by a Performance Solution.

This does not mean every building within these classifications requires a special hazard suppression system.

The relevant requirements depend on the building’s installed essential fire safety measures and applicable documentation.

Building owners should refer to their Fire Safety Schedule and other relevant records.

NSW Government – AS 1851—2012 building fire safety requirements 

Special Hazard Logbook Features at a Glance

View the Special Hazard Fire Suppression Systems Logbook 

Frequently Asked Questions

What is a Special Hazard Fire Suppression Systems Logbook?

It is a dedicated record book for documenting applicable routine servicing of special hazard suppression systems under AS 1851—2012 Section 7.

Which systems does the logbook cover?

It includes applicable records for gaseous fire suppression, fixed aerosol and open nozzle water mist systems.

What service frequencies are included?

The logbook contains Monthly, Six-Monthly, Yearly and Ten-Yearly service records.

Does it include storage-container charge measurements?

Yes. The Six-Monthly section provides space for recording the charge of up to nine storage containers in kg / mm, as applicable.

Does it include enclosure integrity testing?

Yes. The Yearly section includes fields for Equivalent Leakage Area in m² and Retention Time in minutes for applicable gaseous total flooding systems.

Does it include pressure-relief vent testing?

Yes. The Yearly section provides four fields for recording pressure-relief vent operating pressure in Pa.

Does it include aerosol generator servicing?

Yes. Applicable records include generator discharge status, security, moisture seals and service life.

Does it include water mist servicing?

Yes, for applicable open nozzle water mist systems covered by Section 7. The records include pressure regulators, pumps, air compressors, discharge cycling, water supply testing, additives, strainers and water containers.

Does it include Ten-Yearly service records?

Yes. The Ten-Yearly section addresses applicable nozzle-flow testing, gas-cylinder pressure testing and engineered pressure-vessel inspection.

Does it replace the Fire Detection & Alarm Systems Logbook?

No. Applicable electrical detection and control equipment also requires servicing under Section 6, with records maintained in the relevant logbook.

Can technicians record defects and corrective actions?

Yes. The service sections include fields for defects, results, comments, corrective actions and completed repairs.

Does using this logbook guarantee compliance with AS 1851?

No. The logbook supports record keeping. Compliance depends on the installed system, applicable requirements, service work, test results, competent personnel and rectification of defects.

Conclusion

The Special Hazard Fire Suppression Systems Logbook provides structured AS 1851—2012 Section 7 service records for gaseous, fixed aerosol and open nozzle water mist suppression systems.

Its Monthly, Six-Monthly, Yearly and Ten-Yearly sections support documentation of storage containers, agent charge, detection and release equipment, discharge components, enclosure integrity, pressure-relief devices, interfaces and long-term container condition.

Dedicated measurement fields and defect records help maintain an organised history of servicing and corrective actions.

Purpose-built records for specialised fire suppression systems.

Explore the Special Hazard Fire Suppression Systems Logbook 

For other system-specific records, view the complete Fire Factory Australia logbook range .