Variable Spring Supports

Variable spring supports are engineered devices that support piping loads under thermal expansion and contraction. Unlike a rigid anchor that completely restricts movement, a variable spring hanger accommodates vertical displacement while continuing to carry the pipe’s weight. Among the various pipe hanger types, variable springs are the standard solution for systems where moderate load variation is acceptable during the thermal cycle.

Our product line includes a comprehensive range of spring hangers and pipe support assemblies, covering Types A through G to suit every installation scenario—from overhead suspension to floor-level spring mounting. Each unit utilizes a pre-calibrated spring coil to dampen vibration and prevent excessive stress transfer to the piping network or connected equipment. Whether specified for petrochemical plants or power generation facilities, these spring hangers provide the necessary flexibility and durability for critical industrial applications.

See More Images

How to Install a D-Type Variable Spring Support

Spring Loading Procedure for Standard Variable Springs

View our loading procedure for standard variable springs. See how we test the variable springs prior to being shipped.

Variable Spring Supports Product Video

See More Videos

Q: What is the difference between a rigid anchor and a variable spring hanger?

A: A rigid anchor is designed to fix the pipe in a specific location, restricting all movement (axial, lateral, vertical, and rotational) to protect sensitive equipment. In contrast, a variable-spring hanger allows the pipe to move vertically and limits lateral movement due to thermal expansion while still supporting the pipe’s weight, preventing sagging and stress concentration.

Q: What are the different pipe hanger types available for spring assemblies?

A: Variable springs are available in seven standard pipe hanger types (Types A through G) to accommodate various installation requirements. These range from threaded-rod suspensions for overhead pipes to base-mounted units for floor support, ensuring a configuration suitable for every structural environment.

Q: How does “spring mounting” work for pipes near the floor? 

A: Spring mounting typically refers to Type F springs (base-mounted), which are installed directly on the floor or structural steel. The pipe rests on a load flange or saddle atop the spring coil, allowing the support to compress or expand vertically as the pipe moves, acting as a dynamic cushion from below.

Q: Why are spring hangers preferred over rigid supports for hot piping?

A: In high-temperature systems, piping undergoes significant thermal expansion. Rigid supports cannot accommodate this movement and instead restrain it, resulting in excessive stresses in the piping system. Spring hangers use a pre-compressed coil to absorb this movement, maintaining a balanced load throughout the support system while protecting both the piping and connected nozzles on associated equipment.

Q: How do I adjust the load on a variable spring hanger?

A: Each hanger unit comes with a load column or turnbuckle and travel stops. During installation, the spring is locked in the “cold” position. After the system is live and reaches operating temperature, the travel stops are removed, allowing the installer to adjust the load column or turnbuckle to the spring’s “hot” load, ensuring the pipe support is carrying the correct weight.

Q: Do variable spring hangers help with vibration dampening? 

A: Yes. While their primary function is to support the piping load duringthermal movement, the design that uses a spring coil inherently provides a degree of vibration damping. However, for systems with severe dynamic oscillation, specialized sway braces might be required in conjunction with the spring hangers to ensure stability.

More FAQs…