Vibrasnubs

Vibrasnub

There are snubbers, and there is the Vibrasnub. The Hyspan- Barco Vibrasnub, serves two purposes, one for vibration, and for actual dampening. When used in tandem, Hyspan Barco “Ball Type” Flexible Strut Joints provide a rigid structural support capable of resisting high tensile and compressive loads while allowing lateral, angular and rotation movement. The precision ball and socket construction provide a maintenance free rigid connection to brace piping, pressure vessels, boilers, tanks and other process equipment.

Strut Joints combined with Hyspan Barco Vibrasnub hydraulic vibration snubbers form an assembly that absorbs tensile and compressive shock and vibration loads while allowing gradual movements such a thermal growth. Unlike comparable products, Vibrasnub vibration snubbers are totally self-contained with no external tubing or components providing a low maintenance compact design.


A complete design information for flexible strut joints and Vibrasnub by including force, amplitude charts. The use of snubbers is preferred in thermally operated plant components. In a dynamic event, snubbers instantaneously provide a fixed, practically rigid connection between the component to be secured and the surrounding structure. In this way the dynamic energy from abrupt displacement can be absorbed at once and harmlessly dissipated. The thermal displacements during routine operation remain free of any significant resistance thanks to the specialized operating principles of the snubbers. The Vibrasnub, can be dynamic.

The Vibrasnub supports are installed to protect piping and related plant from shock loads caused by circumstances such as seismic activity, water hammer, etc.

Additional restraints may be required using specific anchors or guides to ensure that the piping corresponds to the correct flexibility. Our Engineering team is available to provide comprehensive advice on all types of Dynamic Supports.

A mechanical snubber is not Vibrasnub, a mechanical device designed to protect components from excess shock or sway caused by seismic disturbances or other transient forces. During normal operating conditions, the snubber allows for movement in tension and compression. When an impulse event occurs, the snubber becomes activated and acts as a restraint device. The device become absorbs the dynamic energy, and transfers it to the supporting structure

The inertial resistance of the mass engages the resilient capstan to tighten around a hardened mandrel, which is part of the structural tube. This, in turn, causes restraining force against the rotation of the ball screw. During standard operation, the associated acceleration is far below the threshold limit of the snubber and will not activate the capstan spring.  The Vibrasnub is hydraulic.

The snubber operates on the principle of limiting the acceleration of any pipe movement to a threshold level of .02 g’s. This is the maximum acceleration that the snubber will permit the piping to see. Should a disturbance attempt to accelerate the pipe in either direction, a braking force will be applied within the snubber of whatever magnitude required to limit the acceleration to a value less than .02 g’s. At the same time, thermal expansion, being a gradual movement, is not restricted. A particular feature of the snubber is that at no time does it lock and thereby become a rigid strut. Should a sudden acceleration occur and sustain continuously in one direction, the snubber will apply whatever force is necessary to limit the pipe movement to its present threshold value. The snubber’s performance is independent of the amount of force being applied.  This is unlike the Vibrasnub

The design of the unit is completely symmetrical, and the same capstan spring will apply this braking action in both the tension and compression loading, which in turn means clockwise or counterclockwise angular acceleration. Therefore, the braking characteristics of the unit in tension and compression are identical.

It can also be noted that when the sudden force is applied, the resisting force is applied by the inertia mass. The inertia mass is mounted to turn freely, and therefore the moment the acceleration drops below the threshold value, it no longer applies a braking force. In additional, the capstan spring is always urging the inertia mass back to an un-braked condition. The net effect is a design which continuously throttles or brakes to limit and control the acceleration. During thermal compensation, the gradual movement, normally associated therewith, is far below the threshold acceleration setting; and therefore, the inertia mass will gradually move without tightening the capstan brake. Should this thermal movement be uneven, or jerky as might occur because of a hanger or skid sticking, the unit might momentarily brake, while permitting the pipe movement.

Remember, there is a mechanical snubber, hydraulic snubber, and the Hyspan/Barco Vibrasnub.