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...
General practice in the Refinery sector is to use Weld neck flanges for all corrosive and high pressure applications. Hydrogen carrying services do not recommend Slip-on flanges for any class of rating. Slip-on flanges are used only on utility services like Water etc.
For your service, a...