Expansion Loops UL / Fire
Flex-Weld UL-Listed Fire-Rated Expansion Loops are designed to absorb thermal, axial, and lateral movement in fire sprinkler and mechanical piping systems. Engineered for random or seismic motion, these loops provide flexibility, vibration control, and protection against stress-induced damage.
Available in flanged, grooved, and male-threaded configurations with various movement ranges and materials, they deliver a space-saving alternative to conventional bellows joints. Easy to install and UL-approved, Keflex™ Expansion Loops ensure dependable performance in critical life-safety applications.
Features & Benefits
– UL Listed & Fire Rated – Approved for use in fire sprinkler and mechanical piping systems where safety and compliance are critical.
– Motion in Three Planes – Accommodates offset, lateral, and axial movement to relieve system stress.
– “L”, “U” or “V” Loop Design – Multiple geometries to meet different installation and layout needs.
– Variety of Sizes & End Fittings – Available with flanged, grooved, or male threaded connections for seamless integration.
– Nested Configurations – Compact, space-saving loop designs ideal for retrofit or confined installations.
– Maximum Vibration Absorption – Minimizes vibration, noise, and fatigue in sprinkler and mechanical systems.
– Seismic & Thermal Protection – Maintains system integrity during thermal expansion or seismic activity.
Applications
– Fire sprinkler systems
– Mechanical piping systems
– Seismic protection of equipment and structures
– Building and facility utility piping
– Thermal expansion compensation in critical systems
Markets Served
– Fire protection and life safety
– Commercial and industrial buildings
– Mechanical and plumbing contracting
– Municipal and institutional infrastructure
– Energy and utility facilities
Expansion Loops UL/Fire (downloadable PDFs)
UL Listed #150 U-Loop Assembly w/ C.S Flanged EndsNeed a custom flexible metal solution?
If your system requires non-standard movement, pressure, or connection configurations, Flex-Weld engineers can design and fabricate custom expansion joints, metal bellows, and flexible hose assemblies to your exact specifications. We’ll tailor materials, end fittings, ply count, and cycle life to meet your application—whether it’s HVAC, power generation, chemical processing, or aerospace.
