5.4.2 - Y-2232-9 Tank Top Plating1.pdf

The document is a detailed technical drawing set for tank top plating details of the Dredge Yaquina, a U.S. Army Corps of Engineers trailing arm suction hopper dredge. The engineering drawings, labeled Y-2232-9, provide comprehensive cross-sectional and plan view schematics of tank top structural components, including multiple detailed views showing precise measurements, welding specifications, and structural integration points. The drawings are part of a planned overhaul and maintenance project for the vessel, which is scheduled for drydock availability from December 2025 through February 2026, with a 60-day drydock period.

The technical specifications cover various structural elements such as shell expansions, tank top platings, sections at different tank locations, and intricate detailing of structural connections. The drawings are prepared by Norfolk Shipping & Dredging Corporation and include general notes specifying welding standards, material requirements, and installation guidelines. These technical drawings will be critical for the shipyard performing the overhaul, which will be selected through a competitive procurement process under solicitation W9127N25BA012, limited to contractors in California, Oregon, and Washington, and requiring a Master Ship and Repair Agreement (MSRA) with the U.S. Army Corps of Engineers Portland District.