Stack Tube Repair

General Stack Tube Assembly Specification:

This specification applies to the following types of trench shields:
3M, 4L, 4M, 6M, 8M, T, E, N, K, and LD

Specifications

• All welding shall be performed according to the Structural Welding Code for Steel - AWS D1.1-90
• A certified welder shall perform all welding.
• 70,000 psi welding rod or wire shall be used to complete the welds.

Procedure

1. Remove existing stacking hardware if required. Contact factory if shield is damaged during this procedure.
2. Clean the area to be welded thoroughly with a wire brush or grinding wheel.
3. Locate stack lug in required position. All lugs shall be located 1/2" from the top of the shield and may be placed in the following position:
   1. End of the shield and centered. (as shown in step three)
   2. End of the shield flush with inside face.
   3. Inside face next to the recessed lift lug.
4. Weld stack lug to the shield using a continuous 3/16" fillet weld.