Page 35: of Marine News Magazine (October 2011)

PosiTector ®UTG Ogdensburg, New York USA ? Phone:315-393-4450 FAX:315-393-8471?Email:[email protected] NEW1-800-448-3835 or www.defelsko.com New UTG METhru-Paint model available Wall Thickness and Corrosion Gage... Ideal for measuring wall thickness and the effects of corrosion or erosion on ship hulls, decks, bulkheads or any structure where access is limited to one side. Scan ModeHiLo AlarmInternal Memory Sturdy, compact design Certificate of CalibrationUltrasonic Thickness Gage method proved to be more efficient and less time consuming, enablingthe Army Corps machinists to com-plete the task within 14 days. Once new pintle bases were put in place, Army Corps machinistsaligned and mounted the millingmachine?s six 13-foot rail beds to the lock walls to machine the quoins.The beds each had a linear rail formachine guidance and rack gear todrive the machine up and down the wall. The final bed, containing the milling machine with a 5-inch diam-eter cutter, milled a 2-1/2-inch x 8- inch slot in the existing quoin, andremoved the corrosion to a tolerance of +/- 0.024 inches. When that was done, a dedicated drilling and tap-ping unit incorporated into themilling machine drilled and threaded 54 holes on each wall quoin so that7-foot long replacement quoin blocks could be installed and boltedto the holes. The expedited process enabled the downstream lock gates to be set in September. The upstream gates will be set in October. Many other dams and locks along inlandwaterways are reaching the limits of their life expectancy and will require similar repairs. Because the milling machine is modular, the Army Corps will be able to easily transport it by barge or truck to future repair project sites. Beyond this, the repair job using the new tools and techniques, taking into consideration man hoursand down time for the waterway, could produce as much as $61 mil- lion in savings on the Markland job alone. MarineNews intends to follow up on those claims with hard statis- tics, once the project is fully complet- ed. To learn more about the milling portion of the Markland project and see other photos of the repair, go to www.cpmt.com/blog (Continued from page 32)www.marinelink.com MN35MN#10 (32-49):MN 2011 Layouts 10/5/2011 1:56 PM Page 35