Improper hydrant system design can result in insufficient water pressure and system failure during emergencies. Non-compliance with safety standards may also negatively impact your business reputation.
To avoid audit findings, rejected insurance claims, and operational disruptions, facility managers must ensure that their hydrant system design is professionally engineered and fully compliant with applicable standards. Learn the complete design process in the following article.
What Is Hydrant System Design and Why Is It Important?
Hydrant system design refers to the integrated planning of piping networks, fire pumps, hydrants, and water supply sources to deliver high-pressure water flow for firefighting.
This system plays a critical role in effectively suppressing fires in high-rise buildings, factories, and industrial complexes. Proper hydrant system design helps prevent failures such as inadequate pressure or insufficient hose reach, which could otherwise accelerate fire spread and increase the risk of casualties.
Standards Used in Hydrant System Design
1. NFPA 14 Hydraulic Design
The relevant NFPA standard for hydrant system installation is NFPA 14, which governs the installation of standpipe and hose systems, including requirements for dimensions, pressure capacity, and placement.
NFPA standards also specify the use of highly visible colors for hydrants—such as red and yellow—to ensure they are easily identifiable during emergency conditions.
2. SNI
Several Indonesian National Standards (SNI) must be considered in hydrant system design, including:
- SNI 03-1735-2000: Specifies planning guidelines for building and site access for firefighting purposes. One key requirement is a minimum water supply of 2,400 liters per minute at 3.5 bar pressure for a duration of 45 minutes.
- SNI 03-1745-2000: Regulates the technical installation of standpipe and hose systems, including installation locations, operating pressure, and system testing procedures.
- SNI 03-3989-2000: Covers the installation of automatic sprinkler systems as additional protection against fire hazards.
3. Local Regulation
Fire protection systems are directly related to the safety of human life within a facility. For this reason, Indonesia has several regulations governing hydrant system design, including:
- PERGUB DKI No. 92-2014 on Technical Requirements and Installation Procedures for Standpipe, Fire Hose, and Yard Hydrant Systems.
- Undang-Undang RI No. 1 tahun 1970 on Occupational Safety.
- Peraturan Menteri PU No. 26/PRT/M/2008 on Technical Requirements for Fire Protection Systems in Buildings and Surrounding Areas.
- Peraturan Menteri Tenaga Kerja dan Transmigrasi No. PER.04/MEN/1980 on Requirements for the Installation and Maintenance of Portable Fire Extinguishers.
Key Stages in Effective Hydrant System Design
1. Risk Analysis and Hazard Classification
Every facility has unique characteristics and risk profiles. Therefore, an effective hydrant system design must begin with a thorough risk analysis and hazard classification to assess potential fire scenarios.
Based on this assessment, the design team determines the location of the hydrant pillar, fire pump capacity, and piping network size. These decisions are driven by factors such as building type, the presence of flammable materials, and the total protected area.
2. Fire Hydrant Layout
For optimal performance, the spacing between hydrants should be 35–38 meters, based on hose reach and nozzle capacity. Access to hydrants must remain unobstructed, especially from parked vehicles, landscaping, or additional structures.
Buildings with eight floors or more are required to use a standpipe-based hydrant system to ensure adequate water supply reaches the highest levels. Hydrants are recommended to be located in open, easily accessible areas—such as near main entrances or evacuation routes—to support rapid firefighting operations.
3. Hydrant Piping and Standpipe Design
Hydrant piping and standpipe design involve a network of high-pressure steel pipes that deliver water to hydrant pillars (hydrant boxes) at various points throughout the building.
The main components include main feeder pipes, secondary distribution pipes, valves, pressure gauges, fire pumps, water reservoirs, and hydrant boxes equipped with hoses and nozzles. Depending on environmental conditions, the system may be designed as a wet system or a dry system. Pipe materials must be of high quality to withstand corrosion and extreme environmental conditions.
4. Integration with the Fire Pump System
Integrating the hydrant and fire pump systems is like connecting the “heart” (the pump) to the “circulatory system” (the hydrant piping), ensuring a strong and stable firefighting water flow when it is needed most.
This integration ensures the pump starts automatically when a hydrant is opened, without the need for human intervention. A rapid and reliable response helps minimize facility damage during a fire event.
Common Issues in Hydrant System Design
Hydrant system design often encounters issues that reduce firefighting effectiveness. However, these risks can be avoided through proper planning in accordance with SNI and NFPA standards. The following are the most common issues encountered.
1. Unstable Pressure
Unstable pressure in a hydrant system is commonly caused by an undersized fire pump, minor leaks, or sensors failing to detect pressure changes. As a result, water discharge may become too weak—or excessively strong—during a fire event.
This issue can be prevented by selecting a fire pump with a capacity appropriate to the building’s demand. Regular pressure testing should also be conducted to verify compliance with applicable standards.
2. Incorrect Hydrant Layout
An incorrect hydrant layout can leave certain areas beyond the reach of fire hoses, allowing a fire to spread rapidly and become difficult to control during an emergency. This can lead to delayed evacuation, extensive building damage, and increased risk to life due to limited firefighting access.
The solution is to comply with recommended hydrant spacing—typically 35–38 meters, based on hose reach and nozzle capacity. The hydrant system design team must also ensure that hydrants are installed in locations that are easily accessible during emergency operations.
3. Dead-End Pipe & High Friction Loss
A dead-end pipe is a hydrant pipe that terminates at a closed end, similar to a dead-end road. High friction loss occurs when water experiences excessive resistance in long or undersized pipes, resulting in significant pressure loss at the most remote points. Both conditions can cause the hydrant system to fail when it is most needed.
The primary solution is to implement a looped or ring main design, in which the piping forms a closed loop so water can flow in two directions from the pump to the hydrants. This approach ensures stable pressure at all points while eliminating dead ends that cause water stagnation and excessive friction loss.
Why Consult with Lumeshield?
To achieve an accurate and reliable hydrant system design, consulting with Lumeshield’s expert team—backed by over a decade of experience—is a smart investment.
Our Fire Protection System Design services deliver comprehensive hydrant system engineering. We perform detailed calculations for hydrant spacing, required flow rates, and water supply capacity, and we use hydraulic simulations to ensure minimum pressure is achieved at the most remote points.
Anticipate and prevent hydrant system failures before they occur. Contact us today to begin your consultation!