Fire Main Losing Pressure? How Commercial Leak Detection Gold Coast Specialists Pinpoint The Leak

A jockey pump that cycles every few minutes when there is no fire event in progress is not a pump problem. It is a pressure problem, and the pressure is going somewhere. For facility managers and building managers across the Gold Coast, from Southport to Robina and Burleigh to Nerang, that symptom is often the first indication that the underground fire main is losing pressure through a leak that may be nowhere near where it becomes obvious. This post explains what the fire main system is doing, what the pump tells you about its condition and why specialist commercial leak detection on the Gold Coast is how you find the fault before the next compliance inspection or a failed pressure test forces the issue.

What Is The Purpose Of A Fire Main?

A fire main is the pressurised water supply system that feeds a building's fire suppression infrastructure. In a commercial or multi-storey residential building, the fire main connects the water supply to the sprinklers, fire hydrants and hose reels throughout the site. The main is kept under constant pressure so that water is available immediately when the system activates.

The integrity of that pressure is critical to the system's performance. A fire suppression system that cannot deliver adequate flow and pressure at the point of activation is a system that may not perform when it is needed. Maintaining the pressure also means maintaining the main itself, including the underground sections that run under car parks, driveways, landscaping and building slabs.

What Is A Jockey Pump And What Should It Be Doing?

A jockey pump, also called a pressure maintenance pump, is a small pump connected to the fire main that compensates for minor pressure fluctuations and keeps the system at its design pressure. The jockey pump is not meant to be running frequently or continuously. It is designed to handle the small, natural pressure drops that occur from temperature changes, minor valve movement or the very small amounts of flow that result from seal wear in the main system.



In a healthy fire main, the jockey pump cycles occasionally and briefly. In a system with an underground leak, the pump cycles frequently because it is trying to compensate for a genuine pressure loss rather than normal minor variation. The more severe the leak, the more frequently the pump runs. In extreme cases, the pump runs almost continuously and is still unable to maintain the target pressure.

How Often Should A Jockey Pump Run?

There is no single threshold that applies universally, as jockey pump cycling frequency depends on the system's design pressure, the pump's capacity and the baseline condition of the main. However, as a practical guide, a jockey pump that activates more than a few times per hour during a period with no fire events in progress warrants investigation. A pump cycling every few minutes, or running for extended periods without recovering pressure to the setpoint, is a clear indication that something in the system is consuming water or losing pressure faster than normal wear would account for.

The pump running frequently is not a fault with the pump. The pump is doing its job. The issue is that the system has a demand the pump was never designed to meet continuously, which is almost always a leak in the main.

Fire Main Pressure Tests: What A Failed Or Borderline Result Means

Fire main pressure tests are a standard part of fire system maintenance schedules. The test applies a specified pressure to the main and monitors for pressure drop over a defined period. A system that holds pressure within the specified tolerance passes. A system that drops pressure beyond the tolerance fails.

A failed pressure test does not identify where the leak is. It confirms one exists. The question that follows is where, and that question has real financial consequences depending on how it is answered. An immediate excavation based on a pressure test failure alone means digging blind, often across substantial areas of paved or landscaped site, until the fault is located. This is expensive, disruptive and occasionally produces multiple mobilisations when the first trench does not find the leak.

A borderline pressure test result is worth taking seriously for a different reason. A system that passes narrowly today may fail at the next scheduled inspection, particularly if the underlying leak is progressing. Failing a fire system inspection creates a compliance issue that affects the building's occupancy and operating status. Narrowing the leak location before that inspection protects the compliance deadline and gives the facility manager time to plan the repair on their schedule.

How Specialist Leak Detection Finds The Fault Without Digging First

Specialist acoustic and electronic leak detection equipment identifies the location of an underground pipe leak by detecting the sound signature the escaping water generates. A pressurised pipe with a leak produces a distinctive acoustic signal as water forces through the fault. Leak detection equipment placed on accessible access points, hydrant outlets or pressure gauges picks up that signal and allows the technician to trace its source along the pipe route.

In a fire main, this technique works across the full range of common pipe materials including ductile iron, uPVC, copper and polyethylene, and across the pipe depths typical of commercial site installations. The result is a leak location identified to a narrow area, often within one to two metres of the actual fault, before any excavation begins.

That is the core of what commercial leak detection Gold Coast property managers rely on: narrowing the location before any digging starts. A single targeted excavation over a confirmed location is a fraction of the cost and disruption of speculative trenching across the site.

The same pressure-drop symptoms can occasionally point to a fault elsewhere in the system rather than in the fire main itself. For those cases, our commercial water mains leak detection page explains how we investigate the broader water supply infrastructure separately from the fire system.

Private Fire Ring Mains: A Specific Concern For Commercial Sites

Many commercial and industrial sites have a private fire ring main, a looped underground pipe system that connects multiple hydrant and hose reel locations across the site perimeter or throughout a larger complex. The ring main configuration is designed so that isolation of one section does not take the entire system offline, but it also means a leak can be in any of several hundred metres of buried pipe.

Locating a leak in a ring main without specialist equipment means either extensive exploratory excavation or using the ring main's topology to isolate sections and narrow the pressure drop to a specific segment. Acoustic detection applied at multiple access points across the ring can identify the leak location without either approach, and the result is a single repair excavation rather than multiple attempts.

If your site is on the Gold Coast, our team provides dedicated fire mains leak detection Gold Coast businesses rely on to avoid unnecessary excavation and protect the compliance timeline for scheduled fire system inspections.

What To Do If Your Site Has A Suspected Fire Main Leak

The practical steps for a facility manager dealing with a jockey pump that is cycling too frequently or a failed pressure test are straightforward:

• Document the pump cycling frequency and the pressure readings being logged by the building management system, as this information helps the leak detection specialist assess the severity of the leak before arriving on site
• Check the most recent fire system maintenance records to establish when the pressure readings last showed normal behaviour, which helps identify how quickly the condition has developed
• Avoid isolating the system unnecessarily before the leak detection assessment, as maintaining pressure in the main helps the acoustic equipment identify the fault signal more clearly
• Book a leak detection assessment before committing to excavation, as the detection result will inform the scope of repair works and allow a single targeted excavation rather than exploratory digging

The same underlying issue can also show up in a hydrant system. Our fire hydrant leak detection service covers how we investigate hydrant-specific faults separately from the main ring system.

Talk To Our Team About Your Fire Main

We at Commercial Leak Detection work with facility managers, building managers and property owners across the Gold Coast on fire main leak detection, pressure testing support and underground leak location for commercial and multi-residential sites. If your jockey pump is cycling too often, your pressure test has failed or you have a borderline result you want to investigate before the next inspection, contact our team and we will assess the situation and provide a clear plan before any ground is broken.