Super Hot Columns: Other tolerances

Item

Tolerances

Side length, B

+ 1.0% of B but not greater than + 3mm

Concavity/convexity

0.5 % of B but not greater than 3mm

Squareness of corners

+ 1o

Length

+20/ -0 mm

Straightness

less than 9m long

1/1500 of total length

 

9m and longer

1/1250 of total length

Twist

1.5B/1000 times the total length in metres

 

9 to 16mm exc.

-0.3mm/ +1.0mm

Thickness

16 to 25mm exc.

-0.3mm/ +1.2mm

 

25 to 60mm inc.

-0.3mm/ +1.9mm


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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