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API 650 - Storage Tank - Flange Holes to be straddled

API 650 - Storage Tank - Flange Holes to be straddled

Postby laurudolphy » Tue Sep 24, 2013 5:23 am

Hi, Folks
This does not pertain directly to welding however it is connected to inspection activity.

During fitup/welding of Flanges, it is a normal practice to have the bolt holes straddled to the vertical line. i.e. the vertical axis (0 to 180) will pass between two bolt holes equally distributed.

When it comes to roof nozzles, how are the holes to be straddled.

1.) Do the holes straddle the tank true 0 - 180 degree axis,
OR
2.) Do the holes straddle the orientation line (following the angular line where it is located)

Your views and opinion will be highly appreciated.
laurudolphy
 
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