EQUIPMENT FOR EVERY SITUATION
Electromagnetic Line Locating is the standard solution for underground utility locating. One of three methods can be used:
- Direct Connection (Conductive) A line from the transmitter is clamped to a utility access point (such as a meter) to establish contact with the utility. The transmitter’s signal moves through the utility line and is traced by the operator who walks along the surface, following the receiver’s readings.
- Induction is used when there is no surface access (such as a meter) to a buried utility line. The transmitter is placed on the surface where the target line is believed to run. The operator traces the signal as with a Direct Connection.
- Sonde is a traceable instrument probe that is used when the buried utility is non-metallic (plastic pipes, concrete sewer lines) and can be accessed from the surface (through a drain or manhole). The Sonde is pushed through the conduit, and as it moves underground it emits a signal the operator follows on the surface.
Ground Penetrating Radar (GPR) equipment locates metallic and non-metallic objects. GPR transmits radio waves through a surface and records the strength and time of the reflected signal. A series of pulses of the reflected signals over a single area make-up what is called a scan.
VisionScan services show the exact location of utilities and possible obstructions prior to any land disturbance. Equipment is capable of detecting live electric power, passive radio frequency as applicable to some natural gas transmission lines, and impressed current as related to cathodic protection systems.
VisonScan can quickly mobilize to your site and help you to map utilities and other subsurface objects quickly and accurately. Our team has performed utility one-calls to locate gas lines within a 10,000-acre area in two days.