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:
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
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.
Ceiling hangers can comprise of spring elements, rubber elements or a combination of both. The use of spring hangers is recommended for locations subjected to impact and very low frequency noise. The hanger springs can provide lower natural frequencies than the designs that have rubber elements alone. When the two are combined the resulting anti-vibration hanger provides acoustic isolation across a wide frequency range.
The spring ceiling hanger consists of a metal bracket, spring with metal cup, and an elastomer element. The anti-vibration hanger can be suspended from a threaded rod that is properly anchored or can be attached directly to a metal or concrete deck. Normally the hanger springs are rated for a one inch deflection. The neoprene elastomer element is resilient enough to support one or more layers of the gypsum board that goes into the false ceiling. The spacer bracket which is a part of the spring ceiling hanger holds the vibration hanger rigidly till the gypsum board weight compresses the spring into position.
The metallic spring brackets that house the spring coil and the elastomeric element and made from metal strip bent into a near rectangular shape. They are protected from corrosion by the process of galvanizing or powder coating. Since the spring ceiling hangers are hidden from view, adequate corrosion protection is provided.
The high rise buildings also house the HVAC equipment, piping and ducting. While the HVAC equipment is mounted on the top of the buildings, the piping and ducting crisscrosses the various floors in the building. The designers try to hide the ductwork and piping between the concrete and gypsum ceilings. The problem that can arise is the vibrations carried by these HVAC ducts which can get transmitted to the supporting structures. This can create serious noise problems in the work areas inside the building. The solution lies in the use of HVAC hangers which can isolate the suspended piping or duct from the supporting structure. The deflection of the spring element combined with the resilience of the elastomeric element provides an effective dampening of vibrations.
The pipelines used in the industry, commercial and residential buildings are sometimes used to transport fluids at high temperatures. Since most of these pipes are metallic, they are prone to thermal expansion. If the rigid supports are provided, the pipes tend to deform when they carry the hot fluid. This can cause damage to the installed pipes. To take care of the thermal expansion and return to shape when the fluid temperature becomes normal, the use of pipe spring hangers is recommended. The spring element in the piping spring hangers can get stretched out or get compressed under the thermal movement of the pipe. The hangers provide for free displacement of the pipe in the vertical direction.
Andre HVAC International Inc. has been in the field of anti-vibration hangers and mounts for a good thirteen years now. They not only have the expertise in the field of pipe, ceiling, and HVAC hangers but also have a wide variety of the spring hangers in their manufacturing range.