Sway Braces Homepage > Vibration Control & Sway Braces



SIZE RANGE: For pipe sizes 2 through 24 inches. vibration control and sway brace
SERVICE: Recommended for controlling vibration, absorbing shock loadings; guiding or restraining the movement of pipe resulting from thermal expansion; bracing a pipe line against sway.
INSTALLATION: Shipped ready for installation.
ADJUSTMENT: The sway brace should be in the neutral position when the system is hot and operating, at which time the tension test collar should be hand tight. If it is not, the sway brace should be adjusted to the neutral position by use of the load coupling. The screws in the tension test collar need not be loosened, since they serve only to secure it to the load coupling.
  • Vibration is opposed with an instantaneous counter force bringing the pipe back to normal position.
  • A single energy-absorbing pre-loaded spring provides two way action.
  • One spring saves space and simplifies design.
  • Spring has 3-inch travel in either direction.
  • Accurate neutral adjustment assured.
  • Enclosed spring excludes dirt and gives a clean, compact appearance.
SPECIFICATION: Fulfills the requirements of the ASA Code for Pressure Piping as to fabrication details and materials.
HOW TO ORDER: Specify figure number, name, size, and overall dimension.

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Figure 550 and Figure 555 Vibration Control Devices Sway Strut Assemblies



Size Selection:

The vibration control and sway brace gives full deflection forces from 200 to 1800 pounds and has initial precompressed spring forces from 50 to 450 pounds to dampen vibrations, oppose pipe sway and absorb shock forces.

The exact amount of energy needed to control piping should be in proportion to the mass, amplitude of movement, and nature of disturbing forces acting on the pipe. When it is possible to calculate the exact restraining force required, the size of the vibration control and sway brace capable of providing this force should be selected.

To simplify the selection of size, engineers have designed the vibration control and sway brace in three sizes that are readily related to nominal pipe size. For pipe sizes 3-1/2 inch and smaller, the small size is recommended; for 4 to 8-inch, the medium size; and for 10-inch and larger, the large size.


The vibration control and sway brace is shipped ready for installation. The rod coupling rotates with slight resistance and the tension test collar can be rotated by hand while holding the rod stationary.


Rod lengths should be cut and final tension of adjustments made for the hot or operating position of the pipe. If, with the pipe in its hot position, the tension test collar cannot be turned by hand or turns very freely, loosen the jam nut adjacent to the rod coupling and rotate the coupling until the collar can just be turned by hand. Retighten the jam nut.

When correct tension adjustments are completed, the brace exerts no force on the pipe in its operating position. Under shut-down conditions, the brace allows the pipe to assume its cold position. It exerts a nominal cold strain force equal to the pre-load force plus the amount of travel from the hot to cold position, times the spring scale of the particular size of the vibration control and sway brace.

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