Fire water tanks are not like your average rainwater or potable water tank. They are a critical part of a building’s fire protection system, and they are governed by specific compliance requirements under Australian Standard AS1851. If your fire tank is cracked, leaking, corroded or failing an inspection, getting it repaired correctly is not optional.
This guide explains what AS1851 requires, what types of repairs are commonly needed, and why fire tank repairs must be handled by a qualified specialist.
What Is AS1851 and Why Does It Matter?
AS1851 is the Australian Standard for the routine service of fire protection systems and equipment. It sets out the inspection, testing and maintenance requirements for all fixed fire protection systems, including fire water storage tanks.
Under AS1851, fire water tanks must be inspected on a regular schedule: quarterly, six-monthly and annually depending on the component. The inspections cover water level, tank condition, structural integrity, access hatches, inlet and outlet valves, and the condition of any internal linings or coatings.
If a defect is identified during an AS1851 inspection, it must be rectified within a specified timeframe. Leaving a defect unaddressed puts your building’s fire certification at risk and, in the event of a fire, may affect your insurance position significantly.
What Are the Most Common Fire Water Tank Repairs?
Fire tanks fail for many of the same reasons as other water storage tanks, but the consequences of failure are more serious. The most common repairs we see include:
Crack Repair and Structural Sealing
Concrete fire tanks are prone to cracking over time, particularly in areas with heavy clay soils that shift seasonally. Cracks must be repaired using food-grade or potable-water-safe sealants. Standard concrete crack repair products are not appropriate for water storage use. The repair must also be inspected to confirm it is holding before the tank is returned to service.
Internal Lining Replacement
Many older fire tanks have an internal bitumen or epoxy lining that protects the concrete from water ingress and contamination. When these linings start to degrade, they can peel, blister or introduce contaminants into the water supply. Relining a fire tank is a specialist job that typically requires confined-space procedures and careful surface preparation to ensure the new lining bonds correctly.
Inlet and Outlet Valve Repairs
Valves on fire tanks are tested during AS1851 inspections and must operate correctly under pressure. Stiff, seized or leaking valves need to be replaced or serviced and tested before the system can be signed off as compliant.
Pump and Pressure System Repairs
Many fire tank systems include a booster pump or fire pump that maintains pressure in the sprinkler or hydrant system. Pump failures need to be addressed urgently as they can render the entire fire suppression system ineffective. See also our notes on pump cycling and leak issues for context on how these failures often present.
Access Hatch and Cover Repairs
AS1851 requires that tank access hatches be properly fitted, lockable and in good condition to prevent contamination of the water supply. Damaged or missing hatches are a common defect found during inspections.
Can Any Plumber Carry Out Fire Tank Repairs?
No. Fire protection work in Australia is a licensed category in its own right. While a general plumber can carry out some associated work, repairs to fire water tanks that form part of a compliant fire protection system must be carried out by a licensed fire protection plumber or contractor with experience in AS1851 compliance.
Using an unqualified tradesperson to repair a fire tank creates two problems: the repair may not meet the standard, and the system cannot be certified as compliant by the inspector until work is done correctly. This means you may end up paying twice.
How Does an AS1851 Fire Tank Inspection Work?
The inspection process under AS1851 is structured across different inspection frequencies:
- Quarterly: Visual check of water level, external condition, access hatches and signage
- Six-monthly: More detailed check including valve operation and inlet/outlet condition
- Annually: Full internal inspection including structure, lining, pumps and full system test
After each inspection, the contractor issues a service report. Any defects are categorised and a rectification timeframe is assigned. Category 1 defects (critical to system operation) must be fixed immediately or as soon as practicable. Category 2 defects have a longer window but must still be addressed before the next scheduled inspection.
What Happens If You Don’t Repair a Fire Tank Defect?
Leaving a fire tank defect unrectified is a serious compliance issue for building owners, strata managers and facility managers. The consequences can include:
- Failure to obtain a compliant AS1851 service report
- Risk of non-compliance with the Building Code of Australia and local council fire safety requirements
- Potential voiding of building insurance in the event of a fire
- Personal liability for building owners or strata committees if a fire results in injury or property damage
Transform Water and Fire Tank Repairs
Transform Water carries out fire water tank repairs across Sydney and regional NSW. We work alongside fire protection inspectors and strata managers to ensure defects are rectified correctly and to the standard required for AS1851 sign-off.
We also handle fire water tank cleaning as part of the same process, so your tank can be returned to full compliance in one visit where possible.
Need fire tank repairs in NSW? Contact Transform Water to discuss your inspection report and get the right repairs scheduled.
Frequently Asked Questions
What does AS1851 require for fire water tanks?
AS1851 sets out inspection, testing and maintenance requirements for fire protection systems including fire water storage tanks. Tanks must be inspected quarterly, six-monthly and annually. Any defects found must be repaired within the timeframes specified in the inspection report.
Who can repair a fire water tank in Australia?
Fire protection plumbers with the appropriate licence category must carry out repairs to fire water tanks that form part of a compliant fire protection system. Using an unlicensed tradesperson can result in the repairs not being accepted by the AS1851 inspector and the system remaining out of compliance.
How often does a fire water tank need to be inspected?
Under AS1851, fire water tanks require quarterly visual inspections, six-monthly servicing and annual full system inspections. The frequency may vary depending on the system type and local council or insurer requirements.
What happens if a fire tank defect is not repaired?
Unrepaired fire tank defects can result in a non-compliant AS1851 service report, potential voiding of building insurance, council compliance orders and personal liability for building owners or strata committees in the event of a fire.
Can a cracked concrete fire tank be repaired or does it need to be replaced?
Most cracked concrete fire tanks can be repaired using specialist sealants and relining products provided the structural integrity of the tank is intact. A thorough inspection will determine whether repair or replacement is the more cost-effective and code-compliant solution.
