Video: Mission Possible × The project had many challenges. The conductors rose at a height of 200 feet over the river’s surface. The towers where the conductors were located were initially unsafe to climb. To remedy this, CTDOT replaced the existing ladders and added steel members at key locations to strengthen the towers. Plus, the bridge is located 30 feet from the Moses Wheeler Bridge, a heavily trafficked, six-lane bridge that carries I-95 traffic over the Housatonic River. Due to this proximity, public safety was a major concern. The project team had to erect (and then remove) a safe work zone across the bridge and completely restripe the highway to make room for the work zone. CTDOT and MNR restricted work hours and work had to stop every 20 minutes while trains crossed the bridge below the workers. By Air or By Sea – Choosing the Right Solution To remove the conductors, Black & Veatch worked with UI to consider several options: Using a floating barge crane. This option was ruled out due to the limited space between the tower and the Moses Wheeler Bridge (I-95) for the South Circuit, and it was deemed an ineffective option for the North Circuit. Using a helicopter to remove both circuits. This would work for the North Circuit, but CTDOT said it would not be a viable option for the South Circuit. After careful consideration, it was decided to use a helicopter to remove the conductors on the North Circuit and place a large man lift on the Moses Wheeler Bridge to remove the conductors on the South Circuit. Approaching the North Circuit removals via helicopter required painstaking coordination with MNR, CTDOT and the Federal Aviation Administration (FAA) to ensure the safety of the vehicles on I-95, the passengers on the MNR railroad, and the general public as the helicopter flew to and from the bridge. After establishing a landing zone on the riverbank, the helicopter was used to fly craft labor and materials to and from the towers. The workers prepped the conductors for removal and removed support hardware and insulators from the towers. To approach the South Circuit removals via bridge-based crane, Black & Veatch worked closely with CTDOT, which was responsible for traffic control measures and the FAA for emergency landing requirements. A crane was set up on the bridge to raise personnel and equipment to each of the three towers. The air flow spoilers were removed, and the conductor was prepped for removal. The helicopter removed the conductor using a technique called a reverse rope pull. Lastly, the rope was removed by putting slack back into the spans and pulling the rope over to the bridge deck. “All the work – both on the north and south circuits – was performed in 20-minute segments to minimize disruption to both the I-95 and railroad traffic, and to ensure the safety of those passengers,” Rector said. “Due to multiple safety factors – including the height and location of the towers and the use of a helicopter – work could only be performed during daylight hours. When inclement weather restricted the use of the helicopter on the North Circuit, craft workers had to climb the towers.” Black & Veatch also handled the construction of the 14 new transmission structures, which were built on the riverbanks just north of the railroad bridge. The two monopoles that carry 1,200 feet of new high-tension wire at a height of 94 feet over the Housatonic River were each 180-feet tall, supported on 10-foot diameter piers. The tower construction was performed primarily from the land, although a boat was used to carry the wire across the river. “We put a lot of creative thought and energy into finding the right solution for this project, but that’s our specialty. Black & Veatch delivers the design and planning expertise to help clients be successful,” Rector said. Image Gallery Contact us to learn more about what we can do for you. 0 Related Insights UK Power Market: Flying a kite, the 100% renewables myth With Grid Modernization, Utilities Poised For Most Visible Transformation The annual Strategic Directions Report series offers analysis and insights into key issues and trends facing the smart cities and utilities, electric, natural gas, and water utility sectors. FLNG Solutions Prove To Be Much More Than Potential It was roughly a decade ago when the initial introduction of floating liquefied natural gas (FLNG) solutions sought to help bring uneconomic gas reserves offshore, such as those in remote locations, to the market. Over the past few years, however, we’ve watched as offshore FLNG capabilities have moved closer to the mainland, offering a very flexible and economical solution to operators looking to offload their supply around the world. Four Big Trends in Gas-to-Power Hold Promise for U.S. Market Major energy shifts are afoot, and the United States will play a critical role going forward. The EIA projects that by 2022, the U.S. will become a net energy exporter, according to its newly released Annual Energy Outlook 2018. For natural gas, this shift will happen even earlier, around 2020, the EIA says. Market Strives to Deliver Over Pipeline Challenges As if the persistent low-price environment wasn’t enough, rampant natural gas production in the Appalachian and Permian Basins is ramping up concern that pipeline take-away capacity can’t keep up. This comes as the United States natural gas industry prepares to enter one of its strongest growth periods to date, driven by increasing global demand for low cost natural gas supplies and growing domestic demand for cleaner energy sources. Related Project Stories Black & Veatch, Coalition Donate Electric Resiliency to Hurricane-Affected Puerto Rico School, Saving it in the Process A coalition led by Black & Veatch donated tens of thousands of dollars in technology along with the manpower to provide a new, solar-driven power source for the SU Manuel Ortiz in Yabucoa, ground zero of Hurricane Maria. Shell Microgrid Doubles as Research Lab for Testing New Energy Solutions Black & Veatch designed, procured and constructed a microgrid for Shell, which is using it to generate power while it also serves as a working test lab to explore advancements in renewable energy. Client Removes Transmission Lines with Minimal Disruption to Auto, Train Traffic Below The United Illuminating Company needed to replace existing transmission line conductors located on 100-year-old lattice towers built on a historic railroad bridge, hiring Black & Veatch as the EPC contractor. Black & Veatch’s EPC Expertise Expands Capacity, Ensures Reliable Power Delivery in West Texas Black & Veatch provided engineering, procurement and construction services, including permitting, for the new Cassava Substation, enabling AEP to prepare for future growth by providing greater capacity and higher voltage to support area oilfields. Advanced Combined Cycle Facility Delivers Value to Community, Environment, Investors Near the shore of Lake Erie, in Oregon, Ohio, an 869-megawatt (MW) combined cycle power plant, known as the Oregon Clean Energy Center, is now providing critical baseload power to the PJM regional transmission organization and delivering value to virtually all stakeholders.