How to Fabricate Pipe Columns, Pipe Girders, Street Lights and Transmission Poles for Galvanizing
Location of Openings
- The best design of fabrication is to have the end completely open with the same diameter as the section top and bottom.
- This is an acceptable substitute if it is not possible to have a full opening.
- When no holes are allowed in the cap- or base-plate, two half-circles 180º apart at opposite ends of the pole must be used.
Openings at each end must be at least 30% of the I.D. area of the pipe for pipes 3″ (7.6 cm) and greater, and 45% of the I.D. area for pipes smaller than 3″.
Allow 30% of the area of the I.D. for hole sizes at each end.
- End completely open
- Slot A = 3/4″ (19 mm), Center hole B = 3″ (7.6 cm) in diameter
- An example of sizes for a 6″ (15 cm) diameter section. Half-circle C = 1.75″ (4.5 cm) radius
- Oval opening = 1.75″ (4.5 cm) radius
- Half-circle D = 1 5/8″ (1.9 cm) radius
How to Fabricate Box Sections for Galvanizing
Holes and clipped corners must be flush as shown in Figure 6 above. Using the following formulas, the table shows typical sizes of holes:
Internal gussets: Space at a minimum of 36″ (91 cm).
Box sections: When H + W = 24″ (61 cm) or larger, the area of the hole (plus clips) should equal 25% of the cross-sectional area of the box (H x W).
When H + W = less than 24″ (61 cm) but greater than 16″ (40.6 cm), the area of the hole (plus clips) should equal 30% of the cross-sectional area of the box (H x W).
When H + W = less than 16″ (40.6 cm) but equal to or greater than 8″ (20 cm), the area of the hole (plus clips) should equal 40% of the cross-sectional area of the box (H x W).
When H + W = less than 8″ (20 cm), leave completely open with no end-plate or internal gusset.
The above table is for square box sections only. For rectangular sections, calculate the required area, and check with South Atlantic for position of openings.
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