Why Having a Fire Hydrant Is NOT Enough: What Building Owners Need to Know About Hydrant Flow Tests in Singapore

Many building owners assume that if there is already a fire hydrant outside their development, they have met the fire protection requirements.

Unfortunately, this is one of the most common misconceptions we encounter during fire safety assessments, A&A projects, and factory-to-dormitory conversion projects in Singapore.

The reality is simple:

Having a fire hydrant nearby does not automatically mean it can provide enough water when it is needed most.

This is where a hydrant flow test becomes critical.

Why Fire Hydrant Capacity Matters

Under Singapore's Fire Code, fire hydrant requirements are determined based on factors such as:

• Building type

• Occupancy usage

• Fire compartment size

• Required firefighting water demand

Depending on the size of the largest fire compartment, a development may require hydrant flow rates such as:

• 38 L/s

• 57 L/s

• 76 L/s

The larger the compartment, the greater the firefighting water demand.

Many owners are surprised to learn that the key question is not whether a hydrant exists, but whether it can deliver sufficient flow rate and pressure during an emergency.

What Is a Hydrant Flow Test?

A hydrant flow test is conducted to determine the actual performance of the existing public hydrant network.

The test typically measures:

• Flow rate (L/s)

• Running pressure (bar)

• Available firefighting water supply

This allows engineers and authorities to verify whether the existing public infrastructure can support the fire protection requirements of the development.

Without testing, decisions are often based on assumptions rather than actual performance data.

Real Project Example

In one of our recent projects, we were engaged to assess whether the existing public hydrant infrastructure could support the proposed fire safety requirements.

A hydrant flow test was carried out.

The results showed:

• Flow Rate: 60 L/s

• Running Pressure: 4.0 bar

The required hydrant demand for the project was satisfied by the existing public water supply.

As a result, the development did not require an additional hydrant tank or fire pump system.

This helped avoid unnecessary construction costs, equipment installation, and long-term maintenance obligations.

Why This Matters During A&A Projects

For Alteration & Addition (A&A) projects, change-of-use applications, and factory-to-dormitory conversions, fire safety requirements often change.

Examples include:

• Increased occupant load

• Larger fire compartments

• Additional hydrant provisions

• Changes in building usage classification

In such situations, relying on existing assumptions can lead to costly redesigns later in the project.

Conducting a hydrant flow assessment early allows the project team to make informed decisions before construction begins.

Common Misconceptions About Fire Hydrants

Misconception #1:

"There is already a hydrant outside my building."

Reality:The hydrant may not provide sufficient flow rate or pressure.

Misconception #2:

"If a hydrant exists, I won't need a fire pump."

Reality:Additional infrastructure may still be required if the available water supply cannot meet the required demand.

Misconception #3:

"Hydrant testing is only required for large developments."

Reality:Hydrant flow assessments are commonly required whenever fire safety provisions are reviewed or upgraded.

Checklist Before Starting Your Fire Safety Submission

Before commencing your fire safety submission, consider the following:

✓ What is the required hydrant demand under the Fire Code?

✓ What is the size of the largest fire compartment?

✓ Has a hydrant flow test been conducted?

✓ Can the existing public hydrant network support the required demand?

✓ Will a hydrant tank and fire pump be required?

Addressing these questions early can help prevent delays, redesign work, and unexpected costs later in the project.

Fire safety compliance is not simply about having a fire hydrant nearby.

It is about ensuring that sufficient water can be delivered when firefighters need it most.

A hydrant flow test provides the data needed to determine whether the existing infrastructure is adequate or whether additional fire protection systems are required.

For building owners planning an A&A project, factory conversion, dormitory conversion, or fire safety upgrade, understanding hydrant capacity early in the process can save significant time, cost, and coordination effort.

Need support for fire safety assessments, hydrant flow evaluations, or authority submissions in Singapore?

Conceptial (SG) PTE LTD provides M&E engineering consultancy services, including fire protection design, authority submissions, hydrant assessments, and fire safety coordination for industrial, commercial, hospitality, and conversion projects.

Contact us to discuss your project requirements.

Learn more about MEP Consultant Singapore and how early engineering planning can reduce project risks.