Corbec, Hot-dip Galvanizing
Galvanizing conception

Galvinizing design

Vent and draining holes in galvanizing conception Vent and draining holes in galvanizing conception Vent hole correct in galvanizing conception Space mating surfaces in 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]