Venting & Drainage Considerations for Steel to be Galvanized Cont...

• Tubular Fabrications
• Handrail
• Rectangular Tube Truss
• Pipe Truss 3" (8 cm) & Larger
• Pipe Columns, Pipe Girders, Street Light Poles & Transmission Poles
• Box Sections
• Tapered -Single Arm
• Enclosed & Semi-Enclosed Products
• Drainage

Proper Venting & Drainage Hole Placement & Dimensions for Handrail
Paragraph numbers correspond with number references on the following illustration:

1. External vent holes must be as close to the weld as possible and must be 25% the size of the internal diameter of the pipe, but not less than 3/8" (10 mm) in diameter.

2. Internal holes should be the full internal diameter of the pipe for the best quality, lowest cost galvanizing.

3. Vent holes in end sections or in similar sections must be 1/2 " (13 mm) in diameter.

4. & 5. Ends should be left completely open. Any device used for field-erection that prevents full openings on ends of horizontal rails and vertical legs should be galvanized separately and attached after galvanizing.

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