Flange Joint Alignment - Why It Matters

Flange joints are a critical component in piping systems, providing a method for connecting pipes, valves, & other equipment, and ensure a tight seal.
The ASME Piping Code B31.3 (1999 Edition) 335.1.1 9 (c)
- The maximum for lateral or center-line offset is 1.5 mm or less than 1/16”.
- For rotational misalignment the Piping code specifies that it be a maximum 3 mm or less than 1/8”.
Flange Joints & The Role of Alignment Tools
Understanding the importance of flange joints and alignment tools is crucial for professionals tasked with constructing, commissioning, or maintaining piping systems. Flange joints play a key role by connecting pipes, valves, pumps, and other equipment, creating a secure seal while allowing for straightforward assembly and disassembly during maintenance or repair. They help reduce accidents, leaks, and minimize time spent on tasks.
Consequently, flange alignment tools are invaluable for the precise installation and maintenance of flange joints. These tools ensure flanges are properly aligned before bolts are tightened, preserving the integrity and functionality of the connection.
Tyes of Mis-Alignments, Causes, & Solutions
Lateral Mis-Alignment
Rotational Mis-Alignment
Mis-Alignment Solutions
ESI’s flange alignment tools deliver precise correction of both lateral and rotational misalignment in bolted joints—without manual force or safety risk. Using calibrated jacking screws and low-friction contact points, they realign flanges to exact concentricity and bolt-hole position, supporting ASME-compliant fit-up across pipeline systems. Fast, repeatable, and operator-safe, these tools streamline installation and maintenance in demanding field environments.