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.

Anti-vibration hangers for noiseless ceilings and silent HVAC suspensions

The customers today are very specific in their demand of ‘no vibrations and noise emanating from the ceilings.’ They have a similar requirement for vibration and noise free HVAC installation. Andre HVAC International Inc. comes forth with a wide variety of anti-vibration hangers and spring brackets especially suited for these applications. The spring ceiling hangers provide for the acoustic isolation by combining the metal spring elements with the resilient elastomers.

Spring ceiling hangers: The product is available from the house of Andre HVAC International Inc. for both wood and concrete/metal ceilings. These spring ceiling hangers have a spring, elastomer, spring cap and metal plate housing. The springs are rated for a deflection of 1” while the neoprene elastomer element ensures that the concrete or wooden roof is isolated for vibrations and noise from the suspended ceiling. The housing of the hanger springs can be directly mounted to the concrete/metal or wooden roof. The suspension is also possible from a threaded rod that is suitably anchored to the roof. The spring ceiling hangers are flexible enough to allow for the leveling of the suspended false ceiling.

Piping spring hangers: The piping spring hangers and supports are preset at the manufacturing plant based on the installation load specification and blocked in both the directions. These settings are very precise and are carried out on digitally controlled test benches. Blocking of the pipe spring hangers assumes significance with regard to the pickling, flushing and hydrostatic tests which result in additional loads.

  • Factory set values are marked on the pipe spring hangers.
  • The installation position/ cold setting are indicated on the travel scale.
  • The hot position is defined by the maximum permissible load deviation as a reaction force to the expansion and is capped at 25% of the operating load
  • The blocking pieces can be removed and reinserted in any required position in the vibration hangers.
  • The fully galvanized surfaces provide the adequate protection from corrosion.

HVAC hangers: The anti-vibration hangers for HVAC applications can get rid of the structure-borne noise and vibration. These hanger springs are suitable for suspension of HVAC equipment like air conditioners, fans, ducts and piping. The large hole in the rectangular metal frame housing helps in assembly even if there is some angular misalignment. The elastomer grommet ensures that there is no metal to metal contact and perfect isolation from vibrations and noise is achieved. The HVAC hangers are available from Andre HVAC International Inc. in a wide range of load bearing capacity and spring deflection.

For certain applications where not much movement of the ceiling or equipment is permitted due to the civil structure design, you can go in for the pre-compressed spring hangers. Theanti-vibration hangers are adjusted for 70 percent of the anticipated load by the use of the pre-compressed spring. The movement in the ceiling or equipment does not begin till the deflection under load exceeds the 70 percent value. The Andre HVAC pipe and spring ceiling hangers are thus able to meet the majority of customer requirements.