Trenchless Technology

OCT 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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Page 72 of 91

out the silty deposits from the well ield that had formed within the pipeline. To complete the cleaning from the well ield and underneath the river, a lightweight Penetrator jetter nozzle was used. At irst, utilizing a 190-gpm water-jetter truck seemed to be the answer to clearing away all sediments that had solidiied in the raw water main. After 1,700 ft was cleaned and clear of sediment, the water-jetter truck reached a steep portion of the water main that went underneath the river. The change in elevation required more force to propel the jetting operations. To better clean the main, a larger 290-gpm water-jetter truck was brought in to complete the cleaning of the more dificult stretch under the river. Pigging vs. Jetting To successfully clean the remaining ive-mile stretch of dual transmission pipelines from the south of the river to the water treatment plant , a change in the cleaning process was made by employing pigging instead of jetting for this portion of water main. Two different types of pigs were utilized, swab and disc style pigs. The swab pig is made of a light density, polyurethane foam and is lexible and easily degradable and easily maneuverable as a irst pig launch in a pigging operation. The disc pig is much denser and is covered with a more durable polyurethane foam, molded with circular grooves to help remove the more stubborn pipe wall buildup and to maneuver any tttdZE,>^^d,EK>K'zKD73 Disc pig exiting the main.

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