What is the formula used to determine the appropriate size of the stub bolt for a pipe flange?

The method for sizing a stub bolt for a pipe flange is closely related to ensuring the proper fit and securing power required for the application. The formula involves taking the size of the hole and subtracting 1/8 inch, which allows for the ideal clearance and ensures that the bolt fits snugly without being overly tight.

When you subtract 1/8 from the hole size, it accounts for any variability in manufacturing tolerances and ensures that the bolt can be easily inserted and torqued to the necessary specifications without risking damage to the flange or creating stress points. This approach helps maintain the integrity of the joined pipes while allowing for the necessary adjustments during installation.

Understanding this sizing methodology is crucial for pipefitters, as it directly impacts the sealing capability of the joint and the overall safety and functionality of the piping system. Proper bolt sizing is essential in maintaining pressure and avoiding leaks, particularly in high-stakes applications such as in industrial plumbing or HVAC systems.