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Super Hot Columns: Other tolerances
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Item
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Tolerances
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Side
length, B
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+
1.0% of B but not greater than + 3mm
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Concavity/convexity
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0.5 % of B but not greater
than 3mm
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Squareness
of corners
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+
1o
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Length
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+20/ -0 mm
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Straightness
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less
than 9m long
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1/1500 of total length
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9m
and longer
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1/1250 of total length
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Twist
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1.5B/1000 times the total
length in metres
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9
to 16mm exc.
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-0.3mm/ +1.0mm
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Thickness
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16
to 25mm exc.
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-0.3mm/ +1.2mm
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25
to 60mm inc.
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-0.3mm/ +1.9mm
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1) The flat plate portion is defined as the flat plate away from
the corner radius.
2) Concavity, convexity and squareness shall be measured at a position
away from any excess weld metal at the weld location.
3) The straightness tolerance shall be applied to any up and down
bend or any right or left bend with a long pitch.
4) The tolerance on thickness shall be applied to the flat plate portion
away from any excess weld metal at the weld location. |
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