ESI's Industrial Tool Rentals & Sales

Enerteq Solutions Inc. DBA ESI Flange Spreader Rentals BBB Business Review

Flange Joint Alignment - Why It Matters

Jammed bolts because due to a flange mis-alignment.
Bolts are jammed due to a misalignment

 Flange joints are a critical component in piping systems, providing a method for connecting pipes, valves, & other equipment, and ensure a tight seal.

Request A Quote

The ASME Piping Code B31.3 (1999 Edition) 335.1.1 9 (c)

This code specifies the following Flange Joint Misalignment Tolerances:
 
Proper alignment of flange joints is essential to maintain the integrity of the connection and prevent leaks.
 
  • 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”.
 
The above tolerances refers to pipe work being connected to pumps, rotating equipment & pressure vessels.
 
 

Flange Joints & The Role of Alignment Tools

Lateral Mis-Alignment on a 56" Flange Joint Connection.
Lateral Mis-Alignment on a 56" Flange Joint Connection.

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.



Mechanical Alignment Tools on a 56" Flange
2 Mechanical Flange Alingnment Tools align a 56" Class 150 flanged joint in minutes.

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.

Customer review published in BIC Magazine for correcting a 56" flange mis-alignment.
Customer review published in BIC Magazine for correcting a 56" flange mis-alignment.

Tyes of Mis-Alignments, Causes, & Solutions

Lateral Mis Alignment
Lateral Mis Alignment

Lateral misalignment can occur at any point around the flange joint circumference.

Common Causes:

  • Pipe Stress
  • Improper fit or Installation
  • Bolting Process
Rotational Mis-Alignment
Rotational Mis-Alignment

Rotational misalignment is when the axis of the flanges align but the bolt holes are not.

Common Causes:

  • Poor Fabrication
  • Pipe configuration
  • Other Forces Acting on the Joint
AT4K Mechanical Flange Alignmentment tool on a flange
AT4K Mechanical Flange Alignmentment tool on a flange
AT9K Hydraulic Flange Alignment Tool on a flange
Hydraulic Flange Alignment Tool on a flange

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.

Request A Quote