BAB 2 _PCL_edit
18
Pipe & Cable Locating With The 950R & 950T
-
Upload
muhd-zuhairi -
Category
Documents
-
view
35 -
download
0
description
utility chapter 2.. is about pipe and cable locating. also the component and procedure to use PCL. how the pipe cable and locating operation. the equipment and more you can see in this slide.
Transcript of BAB 2 _PCL_edit
Pipe & Cable Locating With The 950R & 950T
Understanding the methods of locating
Mohd Rozaimin Bin Abdul Hamid - CG605
Mohd Rozaimin Bin Abdul Hamid - CG605
Two Types of Signals
Active
– Placed on target line with a transmitter
Passive
– Present on target line
• Three ways to place active signal on line
– Direct connection
– Clamping
– Induction
Mohd Rozaimin Bin Abdul Hamid - CG605
Direct connection
– Connect ground clamp
to stake
– Connect to target line
– Plug cable into
transmitter
Never connect to live
power!!
Turn on transmitter
Mohd Rozaimin Bin Abdul Hamid - CG605
• Clamping
– Place clamp around
target line
– Plug cable into transmitter
– Turn on transmitter
Mohd Rozaimin Bin Abdul Hamid - CG605
• Induction
– Unhook direct connect leads or clamp.
– Place transmitter parallel to target line
– Turn on transmitter
Mohd Rozaimin Bin Abdul Hamid - CG605
Walk in arc around
transmitter (25’-50’)
Pinpoint line
Rotate receiver todetermine direction
Trace and check depthestimates
Mohd Rozaimin Bin Abdul Hamid - CG605
Lost signal
– Walk in circle to detect bend or tee
Unstable signal
– Mark as hand dig area
Suspected power interference
– Sweep area in power mode
Mohd Rozaimin Bin Abdul Hamid - CG605
Gain too high
– Receiver not functioning properly
– Lower gain
Target line has common ground
– Isolate target line
Mohd Rozaimin Bin Abdul Hamid - CG605
Mohd Rozaimin Bin Abdul Hamid - CG605
• Signal transferring to other lines
– Lower frequency
– Lower power level
– Use direct connect or induction clamp
– Move ground stake
– Apply signal where target line is farthest
from other lines
• Select mode
– CATV
– Power
Mohd Rozaimin Bin Abdul Hamid - CG605
• CATV
– 31kHz
– Locate main lines
– Drops can be located if TV is on
Mohd Rozaimin Bin Abdul Hamid - CG605
• Power
– 50/60Hz
– 60P (Primary Cables)
– Current must be flowing to locate
Mohd Rozaimin Bin Abdul Hamid - CG605
Mohd Rozaimin Bin Abdul Hamid - CG605
• Make visual check of area
– Recent trenching
– Line markers
– Lines running down a pole
– Gas meters
– Utility risers
– Drains or manholes
Sweeping the area
– Use peak antenna
Use sweeping pattern
until signal is detected
Trace line
Sweep area again
Mohd Rozaimin Bin Abdul Hamid - CG605
Always read and follow safety precautions
Use equipment only as directed
Contact local One-Call
Verify locates
Hand expose utilities being crossed
Wear/use personal protective gear
Mohd Rozaimin Bin Abdul Hamid - CG605
Thank You
Are there any questions?
