Draft Tube Slot Filler Dimension Drawing.pdf

This is a technical drawing showing dimensions for a turbine draft tube slot filler to be manufactured for McNary Dam. The drawing depicts a picture-frame shaped structure approximately 35 feet wide, 20 feet tall, and 3 feet deep. The design shows a welded steel construction with rectangular hollow structural sections (HSS) forming 20-foot tall legs on the sides. The drawing is provided as part of sources sought notice W912EF25RSS07 to help potential manufacturers understand the dimensional requirements of the project.

The drawing illustrates one of 12 total slot fillers needed (6 sets of north/south pairs) that will be manufactured from ASTM A572 grade 50 structural steel plates and ASTM A1085 HSS steel, with small UHMW components. Each slot filler will weigh approximately 35,000 pounds. The image shows key measurements and provides a 3D isometric view that clearly displays the overall structure and its major components, which will help manufacturers assess their capability to fabricate these large steel assemblies.