How Are Underground Pipeline Leaks Detected?

Underground pipeline leaks are detected using specialist technologies such as acoustic leak detection, tracer gas, pressure testing and underground pipe locating. The most suitable method depends on the pipeline material, the type of fluid or gas being transported, the depth of the pipework and the conditions surrounding the leak.

 

For commercial, industrial and mining infrastructure, locating a concealed pipeline leak can be challenging. Pipelines may extend over considerable distances, pass beneath roads and hardstands or operate within large underground networks where the source of pressure loss is difficult to identify.

 

Commercial Leak Detection provides specialist underground leak investigations throughout Perth, regional and remote Western Australia, using appropriate detection methods to narrow the search area and pinpoint concealed leaks before excavation.

What Causes Underground Pipeline Leaks?

Underground pipelines can develop leaks for several reasons, depending on their age, construction, operating conditions and surrounding environment.

Common causes include:

 

• Pipe deterioration: Corrosion, ageing materials and general deterioration can weaken underground pipework.

• Ground movement: Shifting soil, settlement and changing ground conditions can place stress on buried pipelines.

• Joint and fitting failures: Connections, fittings and pipe joints can develop leaks over time.

• Installation defects: Newly installed pipelines may contain damaged sections or faulty connections that become apparent during pressure testing.

• Excessive pressure: Pressure fluctuations and operating conditions can contribute to pipeline failures.

• External damage: Excavation, construction activities and other ground disturbances can damage buried services.

 

A pipeline leak may develop gradually or occur suddenly. In either case, the source is not always visible at ground level.

How Do You Know if an Underground Pipeline Is Leaking?

The first indication of an underground pipeline leak is often a change in system performance rather than visible water.

Common warning signs include:

 

• Unexplained increases in water consumption

• Falling pipeline pressure

• Failed pressure testing

• Pumps operating more frequently than expected

• Difficulty maintaining normal water supply

• Unexpected water meter readings

• Moisture or water appearing in unusual locations

• Unexplained loss from buried infrastructure

However, underground leaks do not always produce visible surface evidence.

 

Water can travel through permeable soil, drainage systems or underground voids without appearing directly above the damaged pipeline.

 

At a mining accommodation camp in Cue, Western Australia, Commercial Leak Detection investigated substantial water loss with no visible surface evidence. The escaping water was eventually found to be flowing into an abandoned underground mine shaft.

 

This demonstrates why specialist investigation is often necessary when conventional visual inspections cannot identify the source.

1. Acoustic Underground Pipeline Leak Detection

Acoustic leak detection identifies sounds and vibrations generated when pressurised water escapes through a damaged section of pipeline.

 

Specialist listening equipment is used to investigate the pipeline and identify acoustic signals associated with escaping water.

 

Technicians systematically survey accessible sections of the underground network, comparing readings and narrowing the search area.

 

Acoustic detection can be particularly effective for pressurised water pipelines where the escaping water produces a detectable sound.

 

However, effectiveness can vary depending on:

 

• Pipeline material

• Pipe diameter

• Burial depth

• Ground conditions

• Water pressure

• Background noise

• Accessibility of the pipeline

Real Project: Bibbulmun Track Water Leak Detection

Commercial Leak Detection investigated unexplained water consumption at a remote facility along Western Australia’s Bibbulmun Track.

 

The facility had an extensive underground water network, with no practical way to isolate individual sections.

 

Using specialist acoustic equipment, the underground pipeline was systematically surveyed until the leak location was identified.

 

Targeted excavation confirmed a damaged 25mm underground pressure pipe, which was subsequently repaired.

 

The project demonstrated how acoustic detection can locate concealed water leaks without extensive exploratory excavation.

2. Tracer Gas Pipeline Leak Detection

Tracer gas leak detection is another specialist method used to locate concealed leaks within underground pipelines.

 

For suitable isolated systems, a tracer gas mixture can be introduced into the pipeline. Where a leak is present, the gas escapes through the defect and may migrate through the surrounding ground.

 

Specialist gas detection equipment is then used to survey the pipeline route and identify elevated tracer gas concentrations.

 

This helps determine the likely location of the leak.

 

Tracer gas can be particularly useful where acoustic methods are less effective, including some deeply buried pipelines and polyethylene pipework.

 

Its suitability depends on the system, the substance normally carried, site conditions and appropriate isolation and safety procedures.

Real Project: Covalent Lithium Diesel Pipeline

Commercial Leak Detection was engaged at the Covalent Lithium mine after a newly installed underground diesel pipeline failed pressure testing during commissioning.

 

The investigation involved specialist pipe locating and tracer gas detection.

 

Four separate underground leaks were ultimately located, allowing each affected section to be excavated and repaired.

 

Following repairs and further testing, the pipeline successfully passed its final pressure test.

 

This project demonstrates the value of specialist leak detection for newly installed mining and industrial infrastructure.

3. Pipeline Pressure Testing

Pressure testing is used to determine whether a pipeline can maintain the required test pressure under specified conditions.

 

It is commonly undertaken during pipeline commissioning, following repairs or when investigating suspected pressure loss.

 

A pressure test can help establish whether a system is losing pressure, but it does not necessarily identify the exact location of the leak.

 

This is why pressure testing is often combined with other investigation methods.

 

Once the affected section has been identified, acoustic detection, tracer gas or other appropriate technologies may be used to pinpoint the fault.

Real Project: Monkey Mia Resort Water Main

At Monkey Mia Resort, unusually high water demand was placing additional pressure on the resort’s desalination plant.

 

Commercial Leak Detection reviewed available service plans, traced the underground water main and used pressure testing and specialist leak detection equipment to investigate the network.

 

The concealed leak was located adjacent to the resort’s services shed.

 

Following targeted excavation and repair, the pipeline successfully held pressure during testing, allowing the water supply infrastructure to return to normal operation.

4. Underground Pipe Locating

Before a buried pipeline can be investigated effectively, its route may need to be established.

 

Underground pipe locating involves using suitable locating technology, existing plans and site information to identify the position of buried infrastructure.

 

This is particularly important on commercial and industrial sites where underground networks may contain multiple pipelines serving different areas.

 

Pipe locating can help technicians:

 

• Identify the pipeline alignment

• Establish the likely investigation area

• Distinguish between underground services

• Plan systematic leak detection surveys

• Reduce unnecessary excavation

• Provide more accurate information to repair contractors

Pipe locating does not necessarily identify the leak itself. Instead, it supports the investigation by establishing where the relevant pipeline is situated.

5. Valve Isolation and Systematic Leak Investigation

Large underground networks can contain multiple branches, valves and interconnected services.

 

Where suitable isolation points are available, systematic valve isolation can help determine which section of the network is responsible for unexplained water loss.

 

Sections of the system are progressively isolated and investigated, allowing the search area to be reduced.

 

Once the affected section has been identified, specialist detection equipment can be used to locate the leak more precisely.

Real Project: Mining Camp Water Leak Detection in Cue

At a large mining accommodation camp in Cue, more than 300 rooms were supplied by an extensive underground water network.

 

The site was experiencing substantial unexplained water consumption.

 

Commercial Leak Detection used systematic valve isolation to narrow the investigation before introducing tracer gas into the affected pipeline.

 

The leak was pinpointed beneath a paved area.

 

Excavation revealed that the escaping water was flowing into an old abandoned mine shaft beneath the site, explaining why there had been no visible water loss at the surface.

6. Thermal Imaging for Concealed Water Leaks

Thermal imaging can assist certain leak investigations by identifying temperature differences associated with concealed water movement or moisture.

 

A thermal imaging camera records surface temperature patterns that may indicate an abnormal condition requiring further investigation.

 

Thermal imaging does not directly see through concrete, soil or other solid materials. Instead, it identifies temperature variations at accessible surfaces.

 

It can be useful where leaking water creates a detectable temperature difference, particularly within buildings or beneath accessible flooring.

Real Project: Dunsborough Shopping Centre

Commercial Leak Detection investigated unexplained moisture and water staining at a Dunsborough shopping centre.

 

Thermal imaging identified a temperature anomaly beneath tiled flooring near Occy’s Bar & Grill.

 

The investigation narrowed the suspected leak location, and subsequent work confirmed a burst water pipe.

 

This allowed targeted excavation and repair without unnecessarily removing extensive sections of flooring.

Which Underground Leak Detection Method Is Best?

There is no single method suitable for every underground pipeline leak.

 

The correct approach depends on the infrastructure, operating conditions and information available.

 

Detection method	Typical application
Acoustic detection	Pressurised water leaks producing detectable sound
Tracer gas	Suitable isolated pipelines, including difficult buried leaks
Pressure testing	Establishing whether a system is losing pressure
Pipe locating	Identifying the route of buried infrastructure
Valve isolation	Narrowing the affected section of a larger network
Thermal imaging	Identifying surface temperature anomalies associated with concealed water or moisture

 

In many commercial investigations, multiple methods are used together to establish the pipeline location, narrow the search area and pinpoint the fault.

Can Underground Pipeline Leaks Be Located Without Excavation?

In many situations, specialist leak detection can identify the likely leak location before excavation begins.

 

This does not mean excavation will never be required.

 

Once the fault has been located, the affected section of pipeline generally needs to be accessed so the leak can be confirmed and repaired.

 

The advantage of non-destructive investigation is that excavation can often be concentrated on a smaller, targeted area rather than relying on extensive exploratory digging.

 

For commercial properties, mining operations, industrial facilities and environmentally sensitive sites, this can help reduce disruption and unnecessary repair costs.

Why Accurate Pipeline Leak Detection Matters

Underground pipeline leaks can affect much more than the immediate section of damaged pipework.

 

Depending on the infrastructure, concealed leaks may contribute to:

 

• Unnecessary water consumption

• Increased operating costs

• Reduced system pressure

• Delays to construction or commissioning

• Disruption to commercial operations

• Damage to surrounding infrastructure

• Unnecessary excavation

• Environmental disturbance

Accurately identifying the leak location helps maintenance teams and contractors plan targeted repairs.

 

For remote facilities and mining operations, reducing unnecessary investigation and excavation can be particularly valuable.

Underground Pipeline Leak Detection Across Western Australia

Commercial Leak Detection provides specialist leak investigations for commercial, industrial, mining, government and infrastructure clients throughout Western Australia.

 

Our work includes underground water mains, mining pipelines, fire services, commercial water networks and remote facilities.

 

We select appropriate detection methods according to the pipeline, site conditions and nature of the suspected leak.

 

Related services include Commercial Water Leak Detection, Commercial Gas Leak Detection, Fire Main Leak Detection and Mining Leak Detection in Western Australia.

 

FAQ’s

Can an underground pipeline leak occur without visible water?

Yes. Water escaping from an underground pipeline can travel through soil, drainage systems or underground voids without appearing at the surface. Unexplained consumption or pressure loss may be the only indication of a concealed leak.

How do professionals locate underground water leaks?

Professional leak detection technicians may use acoustic equipment, tracer gas, pressure testing, underground pipe locating and valve isolation. The most appropriate method depends on the pipeline and site conditions.

Can tracer gas locate leaks in buried pipelines?

Yes. Tracer gas can be used in suitable isolated pipelines to help identify concealed leaks. Specialist equipment detects gas escaping through a defect and migrating through the surrounding ground.

Does acoustic leak detection work on long underground pipelines?

Acoustic leak detection can be effective on long underground water networks where escaping pressurised water produces a detectable sound. Its effectiveness depends on pipeline material, pressure, burial depth, ground conditions and other factors.

Is excavation necessary to locate an underground leak?

Not always. Specialist detection equipment can often pinpoint the likely leak location before excavation. Excavation may still be required to expose the damaged pipe and complete repairs.

Can you investigate underground pipelines at remote mining and industrial sites?

Yes. Commercial Leak Detection provides specialist leak detection for mining, industrial and remote infrastructure throughout Western Australia, including buried water mains, pipelines and pressurised systems.

Need an Underground Pipeline Leak Located?

If your commercial property, mining operation, industrial facility or infrastructure network is experiencing unexplained water loss, falling pressure or a failed pipeline pressure test, contact Commercial Leak Detection.

 

We provide specialist underground pipeline leak investigations throughout Perth, regional and remote Western Australia.

 

Call 0474 770 021 to discuss your requirements.