brice brown hetek solutions inc - newfoundland and labrador · 2020. 1. 28. · brice brown...
TRANSCRIPT
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Utility LocatingHow it works
Brice BrownHetek Solutions Inc.
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Why is it important to locate?
• 2003 Bloor St. 7 fatalities• Est. cost of damages are high ($1B/YR)*
• Societal Costs• Service Disruption• Emergency Services• Loss of Product• Environmental Impact• Internet
* 2017 CCGA Dirt Report
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In the past there were very basic tools for finding buried utility lines
Still seen in the field today
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vLoc3-Pro Receiver
Connection lead set
Ground stake
Optional signal clamps
Today’s typical locate set
Loc-10Tx 10-Watt Transmitter
Loc-5STx 5-Watt Transmitter
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What has changed?
Then• 1 Frequency• 1 or 2 power levels• No indication of signal output• Depth had to be estimated• Instrument sensitivity (gain) constantly changed
Now• 30+ Frequencies• 4 power levels• Current output and resistance readings
• Constant Depth Readings• Automatic gain
Both operate using the same science
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The Locate Signal
• Is produced by the flow of alternating current (AC) which creates an electromagnetic field
• This electromagnetic field radiates from the line and is known as the signal
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Signals used for locating can originate from a transmitter (active locating), or a variety of other sources (passive locating).
Signal Sources
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• Signals are created by the current flowing from the transmitter which travel along the conductor (line/cable/pipe) and back to the transmitter.
• The current typically uses the ground to complete the current. The ground stake is used to complete the circuit through the ground.
The Locate Signal
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• We think of the signal traveling from the transmitter and back to the ground stake. In fact the signal is continually changing direction, flowing back and forth.
• The rate at which it changes is called frequency, so for instance, 50Hz means the signal changes direction 50 times per second, 8000Hz (or 8 kHz) means 8000 times per second. (The “k” denotes 1000).
• The frequency is chosen depending on the application.
The Locate Signal
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• Low frequency ‐ 100Hz – 1 kHz• Best for cables
• Direct connection
• Long distance
• Low distortion
• Medium frequency ‐8 kHz – 33 kHz• Good for pipes & Cables
• Direct connection, clamp & induction
• Reasonable distance
• High frequency ‐ 65 kHz – 200 kHz• Induction
• Short distance
• Prone to distortion
Active Signal ‐ Frequency Range
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• Signals may use other pipes and cables to return to the transmitter because they represent a lower resistance than the ground.
The Locate Signal
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Use Peak & Null modes to identify distorted fields
• On a clean undistorted field the Peak and Null locate response will line up
• If distortion is present, the peak and null locate response will no longer line up
Typically, the greater the distortion, the further apart these locate responses will be.
Identifying Distorted Fields
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• Locate the line & measure depth with the locator resting on the ground
• Lift the receiver off the ground by a known distance (say) 1ft (30cm)
• Take another depth reading
Using Depth Measurement to identify a vertical distorted field
The depth reading should have increase by the distance you raised the receiver. If it is significantly different, the field is distorted.
Identifying Distorted Fields
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Direct connection – red lead to the target line, black lead to ground
Clamp – induces a signal into a pipe or cable, without making a direct connection
Induction – induces the signal onto a pipe or cable, by placing the transmitter on the surface over the target line
Active Signals ‐ Applying
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Modes ‐ Peak
Peak mode• Provides a maximum response over the line
• Uses two peak antennas
• The most accurate locate mode
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Peak Mode
• What is gain and what do I set it to?• Most accurate mode• Smooth rise and fall• Traditionaly Directional Signal• Grounding
• Omni Direction
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Vector Locate Screen
1 ‐ Frequency selected2 ‐ Signal current3 ‐ Vertical distance to target4 ‐ Horizontal distance to target5 ‐ Scaling (adjust with +/‐ keys)6 ‐ Shows plan view of target7 ‐ Cross section view that shows vectors totarget
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Plan View Locate Screen
1 ‐ Depth and current readings2 ‐ Frequency selected3 ‐ Target line4 ‐ Lines of confidence (closer these are to the target line indicates more confidence)5 ‐ Arrow indicates direction to move towards line, it only shows when the distanceto the target line is far away
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Vector Locate and Plan View Mode
• Automatic Gain• Three sounds to help identify target• No requirement to swing locator• Able to locate pipes from safe location• Constant depth and current• Omni direction (Plan view)
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Pipe materials and other factors
• What can be located• Good conductor but can’t locate?• Ground condition• Connection point• Repairs
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Which signal is the right one?
• Signal Strength• Depth• Current• Follow the signal