Get the right vibration and shock isolation for your equipment

Wherever there is a working equipment or machinery there are vibrations. They may appear harmless to a visitor or may go unnoticed by the people around depending on the intensity and noise generated. The vibrations are however very harmful to your machines and infrastructure. The surrounding equipment and supports also have their own natural frequency of vibration. The vibrations from a working machine are transmitted to the support causing them to vibrate sympathetically. The phenomenon of resonance occurs when the sympathetic vibration frequency matches the natural frequency of the support infrastructure. A loud noise is produced and the supports may vibrate violently causing damage. Thus, it is essential to go in for rubber vibration isolators in order to safeguard your equipment and machines.

  • The rubber vibration isolators are used to limit the amount of vibration energy transfer to the supports
  • The products are suitable for both stationary and dynamic applications.
  • Choice of size, application, and load bearing capacities are available in the product range.

Mount the equipment: The rubber isolation mounts have the elastomer element, which is responsible for the damping of vibrations. The mechanical energy is absorbed by the rubber vibration damper and dissipated in the form of low-level heat. The amount of damping is dependent on a number of factors like the frequency of vibration, weight of the equipment, and the surface area. The selection of the rubber mounts for vibration has to be done carefully by taking into consideration all the contributing factors.

Shapes and types: There are a variety of shapes and sizes available for the rubber vibration isolators and the selection is based on the application requirements. The shapes include cylindrical, hexagonal, and two-piece etc. In addition to the shape, the rubber isolation mounts are available as center metal bonded type and grommet type etc. to name a few. For applications where the equipment is to be suspended from the ceiling, the spring hanger mount vibration isolators are used.

Suspension of equipment: For the HVAC equipment, ducting, and pipes extensive use of spring hangers is done. The spring provides the deflection to take care of the load while the elastomer element provides the vibration damping. The suspended equipment and the support structure are isolated from each other by virtue of the elastomer which does not permit metal to metal contact. The spring hanger supports are used for ease of mounting. The air conditioning units which generate a lot of vibrations when the compressor works can be mounted on the rooftops by using the rubber isolation mounts while the entire ducting in the building can be suspended from the ceilings or support structure using the spring hangers.

Shock Vibrations: When there is an explosion or an earthquake strike, a shock pulse may be generated which results from a sudden acceleration. This form of shock vibration is highly destructive and damaging. Since an earthquake or a terrorist strike is not a routine phenomenon, it used to be ignored earlier. However, as people are becoming more aware they are concerned about seismic restraints and shock vibration control as well. The shock isolators are now being used extensively for the protection of buildings and sensitive high-cost equipment. They are highly recommended for vehicles used by the armed forces on land, sea and in air. The poor road conditions and situations arising out of collisions are “no match” for the shock isolators. Similarly, they are effective in turbulence, rough landings, high-velocity winds and sea storms.

Shackle mounts with an elastomer element between the metal plates are used as an effective anti-vibration product. The shock impacts are suitably absorbed by the rubber vibration damper in tough conditions. A wide variety of shackle mounts is available in varying shapes and sizes. These include the mounting plate and threaded stud type, square plate with corner holes type, and cap plates with elastomer type.

Andre HVAC International Inc. entered the anti-vibration arena way back in the year 2003. From a modest beginning then, AHI is present today in the majority of the anti-vibration products available in the market. The hallmark has been the consistent quality and customer service. The firm provides assistance to its clients on the various aspects of vibration control at the design stage itself. The customers also find AHI to be a one-stop solution for their anti-vibration needs because of the wide variety of products and selection support documentation. Whether it is a rubber isolation mount or a spring hanger, you can be almost sure of finding the suitable type at AHI Inc.


Go in for seismic isolators and spring hangers for your buildings

Seismic restrained isolator: The seismic spring mounts consist of a metallic housing that restricts the vertical and horizontal movement of the supported equipment during a seismic impact. The neoprene elastomer element is fitted in series with the spring coil. It prevents the metal short circuiting between the supporting member and housing. The seismic vibration isolators are designed to withstand forces of 1G magnitude along the horizontal and vertical planes without any yield or failure. The seismic vibration damping mounts function normally as vibration isolators under normal operating conditions.

The features of the seismic spring isolator can be summarized as:

  • Restraint along all major axis with physical limits in the vertical direction
  • Free height and operating height are fixed
  • Adequate rust protection for steel parts and spring coils
  • Easy replacement of spring coils in the field

Seismic spring mounts: The floor mounted seismic spring dampers are used for indoor and outdoor equipment isolation. The welded housings in the seismic spring mount for

Seismic spring mounts:

Seismic spring mounts:

deflection, limit the lateral and vertical movement. The typical use of seismic spring isolators is for cooling towers, chillers, air handling units, and base-mounted fans. The seismic spring is epoxy powder coated while the steel parts are hot dip galvanized for a long service life. The seismic brackets are also used along with other seismic restraint products for better results.

Spring isolation hangers: The vibration hangers are housed in a stamped or welded hanger bracket. The color coded coil spring indicates the load and deflection characteristics of the spring hangers. The metal to metal contact is prevented by the use of a molded fiberglass insert or an elastomer element. The spring in the sound isolation hangers has lateral spring stiffness equal to the rated vertical stiffness. The spring hanger allows for support rod misalignment through a 30-degree arc.  The vibration hanger is suitable for isolation of low speed suspended mechanical equipment like fans and pumps etc.

Piping spring hangers: The anti-vibration hanger is recommended for use around critically quiet areas for the isolation of vibration and noise produced by suspended piping and

Piping spring hangers

Piping spring hangers

ductwork. The pipe support and hangers prevent the vibrations from getting transmitted to the supporting structure. The sound isolation hanger’s rubber absorbs the high-frequency vibrations while the spring takes care of the low-frequency vibrations. The spring hanger extensions and spring brackets are used in tandem with the pipe spring hangers for ease of installation and improving the performance of the isolation system. The swing hangers with spring link are used in the application where the fluid temperature causes the thermal expansion of the piping.

Andre HVAC International Inc. has been providing solutions to builders and designers for adequate seismic protection since it came into existence in 2003. It also has a wide range of products in the spring hanger pipe support and spring ceiling hanger segment used for acoustic isolation in buildings. AHI provides the support to the customers in the selection of the anti-vibration hangers and other seismic restrained isolators.