General Questions & Answers


What is meant by all flange bolt holes are "Straddle the Centerlines"?


During the prefab of a flange to for example a elbow, the position of the bolt holes are of particular importance.

That means..
For a vertical flange face (the flange face in the vertical and the line is horizontal) the bolt holes want to be orientated to straddle the vertical and horizontal centerlines.

For a horizontal flange face (the flange face is horizontal and the line is vertical above or vertical down) the bolt holes want to be orientated to straddle the Plant North centerlines.





Detailed Information

Plant North
Straddle the Centerlines
The article describes "Straddle the Centerlines" in more detail...





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