Ship Building & Repair

Rudder Verification and Assembly Support

Client: Cascade General Inc.

Specific Services:

• Westlake as-built the rudder frame to establish a control plane.
• We made real-time measurements for positioning and field welding of the 6 ton lower casting in 3D. These measurements were made with the rudder in a horizontal position.
• Prior to installation of the upper casting, we checked the dimensions and normality of the milled plane as well as alignment of the bore and taper.
• With the rudder in a vertical position, we made real-time 3D measurements for precise positioning and welding of the 14 ton upper casting.
• Finally, we checked the bore-alignment and horizontal and vertical alignment of the castings to ensure that the gap was within the established maximum 3 mm tolerance. We provided on-site AutoCad support to confirm the final positioning prior to finish welding.

Prefabrication Measurements for the Glomar Explorer

Measurements for new holding tanks and bulkheads were made while the ship was in the water and listing significantly. Based on these measurements, new tanks were prefabricated, then floated under the ship, up through the retractable floor, and welded into place.

Other Services:

• Bow thruster tube rail vertical alignment verification
• As-builts of clevises, moon pool, and riser hold at deck level for complex component matching