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Guidelines For Locating Buried Utilities

Locating Buried Utilities
 

The Charles Machine Works (CMW®), Inc., manufacturer of Ditch Witch® underground construction equipment, offers tips on the types of equipment and procedures necessary to properly locate and identify buried utilities.

PERRY, Okla. — The Charles Machine Works (CMW®), Inc., manufacturer of Ditch Witch® [www. ditchwitch.com] underground construction equipment, offers tips on the types of equipment and procedures necessary to properly locate and identify buried utilities.

Successfully locating and identifying buried utilities is a process of elimination—elimination of mistakes—according to Matt Lumbers, Ditch Witch electronics [www.ditchwitch.com/electronics/] product manager. A thorough understanding of the survey area and the equipment’s correct operating procedures can help you save a great deal of time and money.

No matter what locating equipment you are using, these guidelines will help drilling or excavating crews understand precisely where they can operate safely.

Know Where You Stand.
 “Jobsite awareness is critical,” says Lumbers. “You should gain as much knowledge about the location of the facilities before pulling out your pipe and cable locator.” There are three essential steps:

1. Call 811. “Smart digging always requires a call to 811,” says the 811 website. [www.call811.com/] This cannot be overemphasized. Calling 811 is important whether you are planting a tree in your backyard or installing new utilities.

Calls to 811 are routed to your local One Call Center, where an operator will ask details about your project. With this information, the operator will notify the local utility companies that subscribe to their service. Within a few days, the companies will send a professional locator to mark the approximate location of your underground lines, pipes and cables. Some important things to remember about calling 811:

• Call a minimum of 48 hours before you plan to dig. Some states require a 72-hour notice.

• Only call if you intend to dig. You should not call 811 simply to acquire a map of the utilities in your area.

• One Call contractors mark utilities for free, so take advantage of the 811 service. It can help you avoid utility damage, power outages, fines, and worse.

• Not all utility companies subscribe to 811, so know which utilities may not be located.

• Utility companies will locate the lines they own. Private lines from the meter to the house may not be marked. Also, private lines owned by schools, churches, hospitals, and military bases may not be marked.

For more information, visit the 811 website. [www.call811.com/]

2. Make use of available facility records. Facility records indicate approximate location, umber of facilities, and access points for buried facilities within the jobsite area. Records are usually available from the facility owner. 

3. Visually inspect the jobsite. “Visual inspection is necessary to determine if there are facilities not on record,” says Lumbers.  Evidence of a facility includes poles, dips enclosures, pedestals, valves, meters, risers, and manholes.

Pipe and cable locators [www.ditchwitch.com/electronics/locating-equipment/] actually locate the electromagnetic (EM) field produced by the AC current flowing on the line, not the pipe or cable itself. Many non-metallic pipes and cables have tracer wires buried next to them that can conduct electricity.
EM pipe- and cable-locator equipment systems consist of a transmitter and a receiver that are portable and, when properly used, very accurate. After identifying the best access point to the target line, the operator can place a signal on the line either by direct connection, clamp induction, or broadcast induction. The most accurate method is direct connection, which involves the signal traveling from the transmitter, through the target line, and returning through the ground stake. Here are some recommended procedures for direct connection:

Setup
Remove common grounds and connections to other utility lines to prevent the signal from being placed on untargeted lines.

Insert the ground stake to the left or right of the target line’s suspected path. The transmitter’s black ground wire should not cross other lines.

Connect the black transmitter wire to the stake and the red transmitter wire to the target line. Remove any paint, dirt or corrosion from the target line.

Power and Frequency Selection
On the transmitter, select the appropriate settings to match the conditions of the particular locate. Use the minimum power level and the lowest frequency required to locate the target line. (Remember: the higher the frequency, the easier to couple to adjacent lines, and the shorter distance the signal travels.)

Sweep
Set the receiver frequency to match the transmitter frequency. Conduct a 360-degree sweep around the access point where the transmitter is connected to the target line. This helps locate the direction of the target line.

Tracing the Target Line
The target line can be identified by finding the location with the strongest signal response. Sweep the receiver perpendicular to the target line and walk along its path. Retrace the path and mark with the proper color paint or flags.

Know Your Limits.
A tolerance zone of 18-24 inches should be observed around all located utilities until the exact location is verified. The only way to verify the exact depth and location of a target line is to expose it. First, select the critical areas along the marked path of the target line, and then hand dig or vacuum excavate to the target line. Exposing target lines can be safely accomplished using a Ditch Witch FX20, FX25, FX30 or FX60 vacuum excavation system. [www.ditchwitch.com/vacuum-excavation/]

 
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