Effective vibration isolation technology for suspended equipments

Spring hangers are vibration isolation equipments used for providing vibration isolation for suspended equipment. They offer a combined solution for both vibration isolation and for high and low frequency noise. These spring isolation hangers are often used in suspended equipments like the piping and ductwork with no lateral loads and no change in operating weight.

The application of spring hangers in suspended piping and ductwork helps in preventing vibration transmitting to the surrounding structure. There is wide range of Isolation hangers available in the market, designed in housed cages and encompassing rubber, spring and rubber and spring combination hangers. These spring isolation hangers prevent your machinery from getting damaged with their vibration-control hangers and isolators. The vibration isolation spring equipments are ideal for securing heavy pipes or equipment to limit noise and vibrations during their operations. The hangers effectively isolate transmission of vibration or any form of structural sound. Further, these spring hangers are known to prevent many installation errors as it permit a degree of movement of piping which eliminates the need of a flexible hose connection. In addition to this, the vibration spring hanger isolators will also manage the expansion issues of riser pipe lines.

The market offers a wide range of spring isolators designed to minimize structural transmission of noise and vibration generated by almost any application. With a wide range of hangers available with coil springs for low frequency applications, rubber-in-shear for absorption of sound and shock, this equipment are perfectly designed to offer maximum isolation. Besides, these spring hangers are sturdily built for long rugged use and maximum provision of isolation equipment.

Typical application of spring hangers –

Spring hangers are isolation equipments typically used in suspended equipments which include air handling units, axial fans blower, cooling and heating equipment, ductwork exhaust system, fan coil units, pipe work platform, pumps, ventilation and much more.

Spring isolators are the effective anti-vibration tools for suspended equipment

All modern buildings, malls and industrial complexes make use of the spring isolation hangers for suspension of equipment associated with HVAC, fluid transfer, and any other moving parts. The rotating and reciprocating parts generate vibrations which are transmitted to the surroundings and structural members. It is the spring type vibration isolators that dampen these vibrations and prevent the transmission to the supporting structure or piping. The spring deflects against the load both in the static and dynamic conditions and the elastomer element absorbs the vibrations.

Spring hangers for pipe: All metals have a coefficient of thermal expansion and hence they expand when heated. The metallic pipes which are used to transfer fluids in an industry will undergo expansions and contraction depending on the temperature of the fluid that they carry. If the pipes are put on rigid supports they are likely to be damaged and deformed permanently because they are unable to absorb the force exerted by the pipe when it expands. The variable spring hangers, on the other hand, absorb these forces through deflection of the spring. Also, the spring hangers for pipe allow for an angular movement of 30 degrees from the support point. The pipe thus gets the freedom to expand without much restriction and comes back to its original position when it contracts on cooling.

  • The spring hanger for pipe comprises a steel housing, high deflection spring, and an elastomer element.
  • The riveted plate on the vibration hanger carries the pre-set factory values.
  • The installation position is indicated on the travel scale.
  • The hanger spring’s travel scale also indicates the hot and cold positions. The deflection that happens due to the weight of the pipe in the normal state is called the cold position. The vertical displacement of the pipe when it is carrying the fluid in the hot condition is earmarked as the hot position.
  • The marking is done through blocking pieces which can be removed and reinserted in the position as per requirement.
  • Adequate corrosion resistance is provided by galvanizing the vibration isolation hangers.

Spring isolators for HVAC:  The heating ventilation and air conditioning equipment and its ducting is almost an essential part of the residential and commercial buildings, industrial complexes and malls etc. As per the regulations, the air conditioning equipment is required to be put on the top of the buildings. The air conditioners and air handling units etc. can be mounted using the vibration damping mounts. These are simple elastomer pads with threaded metallic inserts where the equipment can be mounted and bolted in position. In case the air conditioner is to be suspended from the ceiling the spring isolators for HVAC can be used.

The ducting for the HVAC is spread to the various floors in the building and is normally concealed in the false ceiling of each floor. Since the ducting is attached to the HVAC equipment, the vibrations from the moving parts are transmitted to it as well. The spring vibration isolators HVAC become an important tool for preventing vibrations from getting transmitted from the ducting to the supporting structure. In the absence of spring isolation, the noise generated by the vibrating ducts and supporting structure would pollute the working environment.

The structure of a spring isolator: The spring vibration isolators have a simple structure. A metal strip is bent to form a rectangular housing. The housing is attached to the ceiling or support through a rod. The elastomer element prevents the metal to metal contact and dampens the vibrations. The material of the elastomer is weather resistant and can withstand harsh environments also if required. The spring vibration isolators allow for certain construction anomalies by accepting 30-degree variation in the suspension rod. This is possible because of a large diameter hole in the bracket. The spring element deflects based on its load bearing capacity and the spring isolation hangers are rated accordingly. In general, the springs are rated for one-inch deflection.

Andre HVAC International Inc. is in the field of anti-vibration products for more than a decade. It caters to the specific requirements of the clients by providing them with the right kind of solutions. A wide variety of spring hangers is available to suit the requirements of the clients for their HVAC and utility piping suspension requirements. The products perform to the client’s satisfaction and require the minimum maintenance. Support is available for making the right selection of the anti-vibration products for all your needs.

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.

Spring isolation hangers are the perfect match for your equipment suspension requirements

In the multi-storied buildings, hotels and office complexes there are huge utility requirements.  You will find many equipment and piping laid as a network in an under construction building. There are the fire hydrants, heating and cooling pipelines and many HVAC equipment that are to be positioned and concealed inside the building. When the HVAC equipment operates or the fire hydrants are pressurized, vibrations are induced in them through the rotating and moving parts. If the equipment and pipes are secured to the structure of the building, it will not only cause damage but also generate a lot of noises. The most suited solution for the suspension of pipes and equipment is the vibration isolation hanger.

Anti-vibration hangers: The spring isolation hangers are designed to take care of your anti-vibration and noise control requirements. The construction of the anti-vibration hanger is very simple. It comprises a rectangular metal bracket, an elastomer element and a high deflection spring with caps. The spring plays an important part and the spring hanger has to be selected based on the load and deflection requirements. The spring isolation hangers are especially suited for suspension of rotating equipment like air handling units, fan coil units, ventilation fans, large variable air volume boxes etc.  You can make a choice from one-inch deflection spring hangers and go upto four-inch ones. The load capabilities vary accordingly from 40 to 3500 lbs. Thus, you can easily make a selection of the vibration hanger as per your needs.

The features of the anti-vibration hangers are as follows:

  • The rectangular steel housing and other steel parts are zinc plated for corrosion resistance. The steel housing is tested at 5 times the load capacity.
  • The steel rings are color coded according to the load bearing capacity and deflection. They are also tested at 50% overload conditions.
  • In particular types of isolation hangers, it is possible to have pre-compression of springs prior to the installation.
  • The hanger spring isolators can take misalignment within an arc of 30 degrees.
  • High-quality neoprene rubber elements are responsible for avoiding the metal to metal contact.
  • The spring hanger pipe support provides for ease of installation. It can be mounted direct to the support structure or fitted to the drop rod.

Pipe spring hangers: The pipe supports in any building are supposed to meet the two standard requirements. In the case of heating and cooling pipes, the pipe supports must be able to absorb the impact of expansion and contraction due to temperature variation. Also, they must be able to balance the concentrated gravitational load generated by the vertical sections of the pipe. The Andre HVAC International Inc. range of spring hangers for pipe is designed to meet these requirements. The spring coils in the pipe spring hangers can easily resist the compressive forces. The neoprene elastomer elements provide the necessary flexibility and also the much-needed weather resistance. You will be able to find the isolation hangers to meet your requirement easily from the Andre HVAC product range.