Why should Bolt holes straddle centrelines of Vessels
Why should Bolt holes straddle centrelines of Vessels
(OP)
Why should Bolt holes of flanges straddle centrelines of pressure vessels ? I have noticed them in many standards and fabrication rules.
Another question is on why Anchor Bolts of Skirts/Pressure vessels straddle centrelines.
A reasoning I got was that straddled holes provided more space for bolt removal than when the bolt-holes were in-line with the centrelines. Are there any solid reasons for straddling ?
Another question is on why Anchor Bolts of Skirts/Pressure vessels straddle centrelines.
A reasoning I got was that straddled holes provided more space for bolt removal than when the bolt-holes were in-line with the centrelines. Are there any solid reasons for straddling ?





RE: Why should Bolt holes straddle centrelines of Vessels
If a bolt is at the bottom of the flange it will experience accelerated corrosion, failure and lead to a major leak.
RE: Why should Bolt holes straddle centrelines of Vessels
RE: Why should Bolt holes straddle centrelines of Vessels
In both cases, straddling the centreline can be more accurately varified because a square can be aligned with the two bolt holes or bolts so that the opposite leg is aligned with the vessel or foundation axis.
Regards,
Bill Birch
RE: Why should Bolt holes straddle centrelines of Vessels
RE: Why should Bolt holes straddle centrelines of Vessels
This then means that the reactions from any moments are spread equally through all the bolts without any of them acting as a fulcrum to the bending moment.