3M CablePipe Locating Techniques Manual
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61 2 1 6 103 4 8 7 95 11 15 19 20 24 27 43 210 32 35 38 311 46 (16) 18 3. Determining the Depth of the ADP 3.1 Hold the receiver upright at ground level over the located ADP position maintaining the handle orientation perpendicular to the path. Press the depth key on the receiver. Dynatel 2250 and 2273 cable locators can read ADP depth directly. All other locators require that measurements be converted using the following procedure. 3.2 Due to the electromagnetic field produced by the ADP, the indicated depth is a signal depth which must be converted to the depth of the conduit containing the ADP. Below are two sets of tables (inches and centimeters) for specific Dynatel cable locators. Use the first set of tables to determine the ADP depth when using any of the 500DL/573DL Series, 2210, 2220L, or 4420L cable locators. Use the second set of tables for 500A/573A Series cable locators. Depth Conversion Tables for Dynatel Cable Locators 500DL/573DL Series, 2210, 2220L or 4420L INCHES CENTIMETERS Measured DepthADP DepthMeasured DepthADP Depth (18) 20 (29) 33 (20) 24 (33) 39 (44) 52 178 (54) 64168 158 148 138 1211122 115 107 91091 84 77 71 67 (23) 27 (26) 30 (30) 36 (36) 42 (39) 45 (40) 48 (48) 56 (50) 60 Measured DepthADP DepthMeasured DepthADP Depth 5 cm 3 cm 15 cm 25 cm8 cm 10 cm 20 cm 18 cm 23 cm13 cm 28 cm 41 cm 36 cm30 cm 46 cm(110) 22 (14) 16 60 50 56 (12) 14 (10) 1243 cm 86 cm 112 cm 152 cm 183 cm53 cm 61 cm 79 cm 71 cm 104 cm97 cm 119 cm 137 cm130 cm 168 cm 56 cm 51 cm 84 cm 114 cm61 cm 69 cm 99 cm 91 cm 107 cm76 cm 122 cm 152 cm 142 cm132 cm 163 cm201 cm 478 cm 216 cm 231 cm 277 cm 254 cm 348 cm 323 cm 394 cm 447 cm417 cm 300 cm 371 cm 508 cm 538 cm
62 (12) 14 A. Determining ADP Depth with 500A/573A Cable Locators 1. Place the receiver on the ground over the located ADP position with the handle perpendicular to the path. 2. Turn mode switch to SET position. Adjust volume control for meter needle centered in the yellow area labeled SET. 3. Return mode switch to PEAK. 4. Raise the receiver straight up from the ground until the meter needle returns to the SET area of the meter. 5. Measure the distance from the bottom of the receiver to the ground. Find this number in the measured depth column of following tables, then read ADP depth. 2 1 6 103 4 8 7 95 11 5 8 11 14 17 33 110 22 25 28 211 36 (16) 18 Depth Conversion Tables for Dynatel Cable Locators 500A/573A Series INCHES CENTIMETERS Measured DepthADP DepthMeasured DepthADP Depth (18) 20 (29) 33 (20) 24 (33) 39 (44) 52 175 (54) 64164 153 142 131124116 108 91091 8375 68 61 57 (23) 27 (26) 30 (30) 36 (36) 42 (39) 45 (40) 48 (48) 56 (50) 60 Measured DepthADP DepthMeasured DepthADP Depth 5 cm 3 cm 15 cm 25 cm8 cm 10 cm 20 cm 18 cm 23 cm13 cm 30 cm 45 cm 40 cm35 cm(110) 22 (14) 1630 46 (10) 1211 cm 53 cm 79 cm 134 cm21 cm 30 cm 47 cm 37 cm 69 cm 63 cm 86 cm 118 cm 102 cm 150 cm 60 cm 55 cm 80 cm 110 cm65 cm 70 cm 90 cm 85 cm 100 cm75 cm 120 cm 150 cm 140 cm130 cm 160 cm183 cm 458 cm199 cm 215 cm 247 cm 231 cm 296 cm 280 cm 361 cm 426 cm393 cm 264 cm 328 cm 490 cm 523 cm 166 cm 50 cm 50
63 4. Locating Blockage or Collapsed Ducts 4.1 Attach the ADP to a rodding tool and push it down the duct. In ducts with an inside diameter of 1.75 inches (45 mm), a bend with less than a 36 inch (92 cm) radius may obstruct the passage of the ADP. However, as the inside diameter of the duct increases to 2 inches (51 mm), the minimum bend radius becomes 12 inches (30.5 cm). Be aware that a bend in plastic ducts may cause a reduction in the inside diameter by making the duct oval even if the bend radius is large. This too will obstruct the passage of the ADP. 4.2 Do not wait until the rodding tool will not move to locate the ADP. It is best to periodically locate the ADP as it is pushed down the duct. Push the ADP farther into the pipe. Relocate the ADP and mark the spot. Repeat this process about every two paces until no more progress can be made as indicated by the ADP. When the ADP ceases to move, the blockage has been found. 5. Locating Sewer Pipe Problems Using a Video Camera 5.1 When using video to inspect the inside of nonmetallic sewer pipe a repairable pipe problem is seen on the screen. An accurate surface location will save time and money. Also the video camera may become stuck and an accurate position of the expensive device will be needed for retrieval. Attach the ADP to the outside housing of the camera unit. Follow the progress of the camera by locating the attached ADP every few paces. This will require momentarily stopping the progress of the camera down the pipe. When a pipe anomaly is recognized, pinpoint the ADP and mark the spot. 6. Locating a Flushing Hose Nozzle 6.1 Attach the ADP to the flushing hose near the nozzle. Proceed to flush the nonmetallic pipe by inserting the hose and starting the fluid flow. As the hose moves into the pipe, locate the ADP every few paces. Obstructions the nozzle cannot pass are easily marked on the surface. If the hose becomes snagged and cannot be retrieved, a digging point on the surface can be found easily.
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