Venting and Drainage Hole Placement/Dimensions for Pipe Columns & Girders, Street Light & Transmission Poles

(With base-plates and with or without cap-plates)

Location of Openings

1. The end completely open, withthe same diameter as the section top and bottom is the most desirable fabrication.
2. If full opening is not allowed, this is an equal substitute.
3. If full opening is not allowed, this is an equal substitute.
4. If full opening is not allowed, this is an equal substitute.
5. When no holes are allowed int he cap or base-plate, two half-circles 180 degrees apart and at opposite ends of the pole must be used.

Dimensions

For pipe 3" (8 cm) and greater openings must be at least 30% of the cross-sectional area of the pipe at each end and for pipe smaller than 3" (8 cm) 45% of the cross-sectional area for pipe.

1. End completely open
2. Slot A = 3/4" (19 mm), Center Hole B = 3" (7.6 cm) in diameter
3. Half Circle C = 1 3/4" (4.5 cm) radius (examples of sizes for 6" (15 cm) diameter section)
4. Oval Opening = 1 3/4" (4.5 cm) radius
5. Half Circle D = 5/8" (1.9 cm) radius