Lake Washington Air Line Replacement
Full Project Name: Lake Washington Air Line Replacement
Location: Seattle, Washington
Agency: US Army Corps of Engineers – Seattle District
Contract ID: W912DW18PO104
Verdis is the prime contractor for the replacement of the air line system at the Ballard Locks also known as the Lake Washington Ship Canal. The existing air line was constructed using galvanized steel and had experienced multiple leaking and bursts due to the poor condition of the air line. The existing air line was routed through underground tunnels and valve rooms but did include some lines embedded in concrete. The air line provides pressurized air to tool fittings located throughout the locks and to air bubblers located at each gate on the large and small locks. Verdis removed the existing exposed pipe from the site. The new air line is comprised of HDPE pipe with fusion welded seams totaling approximately 2,500 linear feet. The diameter of the new line varies from 1-1/2 to 2-inch pipe with new stainless steel or brass fitting used at tool connections and bubbler connections. Verdis self-performed the demolition of the existing pipe, installation of the pipe, connection to existing bubblers and installation of new tool fittings at all existing locations. The new line was pressure tested. Verdis subcontracted the pipe welding for this contract only.