The mechanical coupling remains a self-restrained joint, and the unique pressure-responsive design ensures sealing even under deflection and pipe movement.
(See panel, ‘What is a grooved pipe joint’.) Grooved mechanical couplings are an alternative to welded U-shaped expansion loops, welded offsets, expansion joints and rubber bellows.
Inadequate accommodation of this movement can result in business risks caused by excess stress on the piping system, including: increased incidence of ruptures and leaks; increased stress on boilers, chillers, valves and other equipment and components; and increased downtime and labour expenses.
All materials, including pipe, experience dimension changes as a result of varying temperatures and their coefficient of expansion.
This often occurs at directional changes in the pipework.
Associated with a free-floating system, flexible couplings are used in piping systems to accommodate piping thermal growth – without the need for any additional components or piping configuration.
Flexible grooved-type couplings allow angular flexibility and rotational movement to take place at joints.