Drawing No1: Examples of improved design using butt welded sections.

Drawing 2: Venting an area enclosed by the continuous welding of a reinforced plate (a). If this is not possible stitch welding should be used (b).

Drawing 3: External stiffeners on open sections should incorporate cropped corners or drainage holes to eliminate “dead pockets”

Drawing 4: On vertical members, drilled holes or V notches should be diagonally opposite each other and as close as possible to the sealed end.

Drawing 5: If holes can be provided in the location shown a cleaner blemish-free coating will be obtained

Drawing 6: Holes should be positioned at the highest and lowest points on the section to ensure that no air is trapped during immersion and that drainage is complete during withdrawal from the zinc bath. Internal bosses should be omitted wherever possible.

Drawing 7:Sections incorporating internal diaphragms and the end flanges must also be property vented. With small rectangular hollow sections, the four corners of the diaphragm plates should be cropped. Larger hollow sections should incorporate an additional “manhole” at the centre of the diaphragm.

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