Ethan Clarke
Locating a plastic water line can be a challenging task. Since the 1980s, most new water pipes have been made of non-metal, non-conductive plastic, which cannot be detected using traditional methods like ground-penetrating radar (GPR). This has led to the development of various techniques and tools to find underground plastic pipes. One common method is to use tracer wires, which are attached to existing lines and walked along the property. Acoustic locating is another effective approach, using acoustic waves to trace the line and find the loudest response. While metal detectors can be used for finding metal pipes, they are not suitable for plastic pipes.
| Characteristics | Values |
|---|---|
| Plastic water line locating methods | Acoustic locating, GPR, pipe locating wand, tracer wire, metal detector |
| Plastic water line materials | PEX, PVC, Polybutylene |
| Plastic water line challenges | Non-conductive, non-metallic, lack of tracer wire |
| Plastic water line depth | Buried deep in the ground to prevent freezing |
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What You'll Learn
Use a tracer wire or locator wire
Tracer wire, also known as locating wire or locator wire, is used to find pipes and other buried utilities. It is made from solid copper, stainless steel, or copper-clad steel, and features HMWPE, HDPE, or PVC insulation types. Sewer lines require green tracer wire, while potable water lines use blue.
Before installing tracer wire, it is important to gather all the necessary information, such as the size of conductors required for the project. The wire should be placed along the length of the buried pipe, with an above-ground termination at each end. Consistency in wire placement is crucial, as constant changes in placement can make it difficult to pinpoint the pipe's centre.
After installation, a locate test should be performed by a municipal representative and the contractor to ensure the system is functioning properly. It is also important to ground dead ends or terminations by attaching them to grounding stakes or rods made from copper, zinc, or magnesium.
To find the buried pipe, a wire tracer is used. This device emits a low-frequency signal to locate the non-energized wire. This eliminates the need to send electricity through the tracer wire. Handheld or larger wire tracers can quickly locate the wire and help prevent accidental damage to buried pipes and cables, which can be costly and dangerous.
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Acoustic locating
To detect the sound of the pulsing water, a digital processing unit, noise-cancelling headphones, and a geophone are used. Acoustic locating can be tedious, but it has proven very effective at finding plastic and asbestos cement pipes. This method is also useful for locating older concrete pipes, which are difficult to find using GPR.
There are some limitations to acoustic locating. Firstly, it is challenging in noisy environments as it relies on sound. Secondly, acoustic locating struggles to turn corners, and the sound becomes harder to pick up at greater depths.
To overcome these limitations, it is recommended to have as many reference points as possible when creating a map. This can include locating survey pins and using building plans to determine where pipes enter or leave a structure. Additionally, tracer wires can be attached to existing lines, such as sewer or water lines, to help locate plastic pipes.
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Ground-penetrating radar (GPR)
GPR is capable of finding all types of materials regardless of conductivity, which makes it a good choice for locating buried water lines. GPR equipment sends a signal into the ground, bouncing off buried material to create a reading. This reading is used to determine the approximate location of the utility or material in question. GPR relies on certain ground conditions to produce a correct reading—saturated ground can make it difficult for GPR to work properly.
GPR antennas are generally in contact with the ground for the strongest signal strength. However, GPR air-launched antennas can be used above the ground. GPR with borehole radars is used to map structures from a borehole in underground mining applications. Modern directional borehole radar systems can produce three-dimensional images from measurements in a single borehole.
GPR has many applications in various fields. In Earth sciences, it is used to study bedrock, soils, groundwater, and ice. GPR is also used in military applications, such as detecting unexploded ordnance and tunnels. GPR is a valuable tool for locating underground pipes, especially those made from PVC or other non-metallic materials. GPR can locate underground pipes effectively and relatively simply.
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Use a metal detector
Metal detectors can be used to find plastic water lines, but only in certain circumstances. Metal detectors can detect ferrous metals like iron and steel, but not plastic pipes or lines. However, if the plastic pipe contains electrical wires or tracer wires, a metal detector can be used to locate it. Tracer wires can be attached to the plastic pipe and then buried to make future detection easier. Alternatively, if one end of the pipe is open, a tracer wire can be fed into it and then detected with a metal detector.
Pipe locators are metal detectors used specifically to locate water lines, mostly in the construction industry. They work by sending vibrations into the ground and listening to the low sounds that bounce back. Cable locators are another type of metal detector used to find pipes and look like long antennas that emit a signal into the ground. Utility locators are used to find small metal pipes or lines that are unmarked. They work by sending an electrical current down the line and listening for changes in pitch in the sound that comes back up.
Metal detectors are generally easier to operate and more commonly available than acoustic PVC detectors. They can be purchased at many major retailers or online. However, it is important to note that locating utilities on your own can be risky and inaccurate. If you are planning extensive excavation, it is recommended to hire a professional utility locating service to ensure accuracy and safety.
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Hire a professional utility locating service
Locating a plastic water line can be challenging, especially if it's underground. While there are various methods and tools available for detecting pipes, some options may not be suitable or effective for plastic pipes.
To ensure accuracy and safety, it is recommended to hire a professional utility locating service. These professionals have the expertise and specialized equipment to accurately identify the presence and location of plastic water lines.
- Expertise and Experience: Professional utility locating companies employ trained specialists who have extensive knowledge about different types of utilities, including water lines. They understand the unique characteristics of plastic pipes and can select the most appropriate detection methods.
- Advanced Technology: Professional services have access to advanced technology and equipment that may not be available to individuals. This includes ground-penetrating radar (GPR), acoustic locating, and pipe locating wands. They can utilize these tools effectively to detect plastic pipes, which are often more challenging to locate than metal pipes.
- Safety and Accuracy: Locating underground utilities carries inherent risks. Mistakes or inaccurate detections can lead to costly repairs and even pose safety hazards. Professionals prioritize safety protocols and have the skills to minimize the chances of errors. They can accurately map out the utility lines, reducing the risk of accidental damage during excavation or construction projects.
- Comprehensive Services: Reputable utility locating companies offer a range of services, including 3D mapping capabilities. They can help identify various underground hazards, such as sinkholes, and detect multiple utility types. This comprehensive approach ensures that you have a clear understanding of what lies beneath your property, reducing the chances of any unforeseen issues during projects.
- Time and Cost Savings: Engaging professionals can save time and money in the long run. Their efficient detection methods and accurate results mean that projects can proceed without delays caused by unexpected utility line issues. Additionally, professional services can provide guidance on safe digging practices, helping to avoid costly repairs due to accidental damage.
When hiring a professional utility locating service, it is essential to select a reputable company with a proven track record of successfully locating plastic water lines. Ensure they have the appropriate equipment and technologies suited for the task.
While do-it-yourself methods may be tempting, the accuracy and safety offered by professional services are invaluable when dealing with underground utilities.
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Frequently asked questions
Plastic water lines are difficult to find because they are non-conductive and non-metallic, which means that traditional methods like metal detectors and ground-penetrating radar (GPR) are ineffective. Acoustic locating is a popular method for finding plastic pipes. Acoustic locators send an acoustic wave through the waterline, increasing the line’s pressure by approximately two psi. The sound of the pulsing water is then located using a device like a geophone. Tracer wires are another common way to find plastic pipes. A tracer wire is attached to an existing line, such as a sewer or water line, and then walked along the property.
Acoustic locating is a process that can work on any pipe, regardless of the material. Acoustic locators send an acoustic wave through the waterline, increasing the line’s pressure by approximately two psi, with a pulse wave generator (PWG) attached to a pressurised hose bib, hydrant, faucet, or other water sources on the line. The sound of the pulsing water is then located using noise-cancelling headphones and a geophone.
Ground Penetrating Radar (GPR) is a traditional technique used to locate pipes made of conductive materials like galvanized steel and copper. GPR is not designed to locate deep, small-diameter, plastic or non-conductive lines.
Tracer wires are the most common way to locate underground plastic pipes. A tracer wire is attached to an existing line, such as a sewer or water line, and then walked along the property.
