The proposed project provides two graving dock caissons for the Portsmouth Naval Shipyard, located in Kittery, Maine. The caissons will be a separate contract funded as part of MILCON P-381 Multi Mission Dry Dock #1. The caissons will be for Dry Dock #1N and Dry Dock #1W. Caisson construction includes steel fabrication, installation of mechanical and electrical systems, and a full testing program of the caisson and its interface with the newly constructed dry dock seats. Construction will be primarily offsite with delivery to the shipyard and final testing at the dry docks.
The caissons will be constructed to meet Military Standard (MIL-STD-1625D(SH)), Safety Certification Program for Dry-docking Facilities and Shipbuilding Ways for U.S. Navy Ships and Unified Facilities Criteria (UFC-4-213-10). The magnitude of construction is between $25,000,000 and $50,000,000. The anticipated award of this contract is March 2021.
