Vibro Seismic Snubbers
Model VRS Seismic Snubbers are engineered for use in areas subject to earthquakes or other external forces capable of displacing equipment mounted on resilient vibration isolation systems. When securely anchored to the building structure and positioned around vibration isolated equipment, the snubbers function as motion limiting restraints, ensuring the supported equipment remains contained during a seismic event.
Key Specifications
VRS Snubbers are intended to be installed in a minimum of four units per equipment item, providing multidirectional lateral restraint. They are not suitable for equipment with a high centre of gravity, nor for applications where vertical load restraint is required.
Product Details
Model VRS Seismic Snubbers are engineered for use in areas subject to earthquakes or other external forces capable of displacing equipment mounted on resilient vibration isolation systems. When securely anchored to the building structure and positioned around vibration isolated equipment, the snubbers function as motion limiting restraints, ensuring the supported equipment remains contained during a seismic event.
VRS Snubbers are intended to be installed in a minimum of four units per equipment item, providing multidirectional lateral restraint. They are not suitable for equipment with a high centre of gravity, nor for applications where vertical load restraint is required.
Vibro Model VRS Snubbers are fabricated as heavy‑duty structural steel weldments designed to minimise equipment displacement under lateral loading. A resilient neoprene impact pad is incorporated at the contact surface to cushion shock loads and reduce transmitted forces. Oversized anchor‑bolt holes are provided to ensure that imposed loads are effectively transferred into the building structure.
(Equipment), (Equipment Bases), (Concrete Inertia Bases), and (Structural Steel Supports) shall be restrained against excessive lateral displacement during a seismic event through the use of resilient snubbers. These snubbers shall be designed to withstand lateral loads of (0.1) (0.2) (0.25) (0.5) (0.75) (1.0) (1.5) (2.0) g, or as required to comply with the prevailing building regulations. All steel components within the snubber assembly shall be engineered to ensure no structural failure occurs under the specified design loads.
Snubbers shall be fabricated from steel and securely fixed to the building structure in a manner appropriate to the anticipated seismic forces, and in full accordance with current building codes.
Snubbers shall be positioned around the equipment as indicated on the drawings, limiting lateral movement at each restraint point to a maximum of 6 mm. A minimum of 4 snubbers shall be installed around each item of equipment supported on resilient mounts.
Each snubber shall incorporate a resilient impact‑absorbing pad and shall be installed with a clearance sufficient to ensure that no contact occurs during normal equipment operation.
Building codes in many jurisdictions require structural and mechanical components to withstand the forces generated during a seismic event. Equipment mounted on resilient supports such as spring, neoprene, vibration isolators can experience significant displacement relative to the building structure during such conditions. Properly designed and strategically positioned resilient snubbers help limit this movement and ensure the equipment remains secure.
Vibro Model VRS Snubbers are engineered as robust, heavy‑duty restraints capable of resisting externally imposed forces. They are designed to remain out of contact during normal operation, ensuring that no vibration is transmitted to the building while still providing reliable restraint when required.
VIBRO Model VRS Snubbers are single‑axis, single‑direction restraints designed to limit lateral movement caused by external forces acting on equipment supported by resilient vibration isolators. Each VRS Snubber shall be installed so that its resilient contact surface engages with a vertical face of the equipment or inertia base once the equipment has displaced approximately 6 mm in any lateral direction.
A minimum of four VRS Snubbers shall be provided for each installation. These shall be positioned at 90‑degree intervals around the equipment to ensure that movement in any lateral direction results in contact with at least one restraint.
Snubber locations shall be as indicated on the contract drawings or, where drawings are not provided, positioned relative to the equipment’s centre of gravity.
Snubbers shall only be fitted after the vibration‑isolated equipment has been fully installed, piped, aligned and placed into operation. Each snubber shall be set with a 6 mm clearance from the equipment during normal operation. Fixing points shall be marked, drilled and secured using bolts or anchors. Where bolts are used, they shall be through‑bolts connected to structural steel capable of resisting the maximum anticipated loads generated by the restrained equipment. Anchors shall be installed in accordance with the relevant building codes and applicable standards.