How do you determine torque values for flanges?

To determine torque values for flanges, start by consulting the manufacturer's specifications or standards, which typically provide recommended torque values based on factors like the flange material, size, and class rating. Additionally, consider the type of gasket used, as different gaskets require different torque settings for proper sealing. It’s also essential to apply torque in a specific sequence, usually in a crisscross pattern, to ensure even distribution and avoid deformation. Finally, consider environmental factors such as temperature and pressure that might affect the required torque.