Corbec, Hot-dip Galvanizing
Hot-dip galvanizing design

Galvinizing design

Vent and draining holes in hot-dip galvanizing conception Vent and draining holes in hot-dip galvanizing conception Vent hole correct in hot-dip galvanizing conception Space mating surfaces in hot-dip galvanizing conception

Chart 1. - Drainage holes for overlapping surfaces - steel thickness less than or equal to 1/2" (1.25 cm)

Overlapping surfaces in2 [cm2] Holes Non-welded surfaces
< 16 [< 103] None None
> 16 and < 64 [> 103 &< 413] 3/8" [1 cm] 1" [2.5 cm]
> 64 and < 400 [> 413 & < 2580] 1/2" [1.25 cm] 2" [5 cm]
each increment of 400 [2580] 3/4" [2 cm] 4" [10 cm]

Chart 2. - Drainage holes for overlapping surfaces - steel thickness greater than 1/2" (1.25 cm)

Overlapping surfaces in2 [cm2] Holes Non-welded surfaces
< 16 [< 103] None None
> 16 and < 64 [> 103 & < 413] None None
> 64 and < 400 [> 413 & < 2580] 1/2" [1.25 cm] 2" [5 cm]
each increment of 400 [2580] 3/4" [2 cm] 4" [10 cm]