How does HVAC spring isolators help reduce the transmission of noise and vibration to the adjoining structure?

Vibration isolation is nothing but a process of isolating equipment’s and machine from the source of vibrations. Undesirable vibration and noise arising from industrial machines will require spring isolators, especially for HVAC equipment’s to prevent the transfer of vibration to adjoining systems, or a building structure or suspended mechanical equipment. Suspended hangers or hanging spring isolators are equipment’s that can reduce structure-borne noise and vibration in HVAC applications. Available in a wide variety like spring vibration isolation hanger and rubber hanger, make for the best suspend isolation equipment such as fans, air conditioners, distribution pipes and ducts.seismic spring mounts

HVAC spring Isolators are designed to provide maximum isolation to suspended equipment and piping system. The spring isolators facilitate high deflection and consists of color-coded spring element, a noise isolation pad, assembled into a welded hanger bracket to offer maximum isolation. Further, to assure stability and maximum isolation the spring element has a minimum lateral spring stiffness of 1.0 times the rated vertical stiffness. Not just that the spring hangers also help support misalignment in the equipment in case of any.

Generally, hanging spring isolators are recommended for isolation of suspended equipment’s especially in cases where inaudible frequency vibration, are at its peak. Suspended mechanical equipment such as exhaust fan plumbing pipes, fans, cabinet fans, and piping and ductwork in close proximity to mechanical equipment typical use spring isolator hangers for solving vibration and noise transmission issues.

The spring isolators HVAC are isolation equipment’s that work on the same principle as other spring vibration isolator. Designed to provide effective isolation and desired spring deflection, makes for an ideal isolator for suspended machines. Based on the load capacity and deflection required one can select the right kind of spring isolator for HVAC system. When it comes to machines like fans, spring isolators provide the best vibration damping solution with similar load and deflection. On the on the hand for equipment’s like heavy chillers which are mounted on the floor, spring vibration hangers with floor mounting techniques are used. Heavy spring hangers are used along with the metallic brackets to suspend the heavy chiller tanks and to accordingly support the other points. At times to meet the applications load and deflection requirement, additional springs are used in a spring isolator.

There are manufacturers out there offering a variety of spring isolator for HVAC. Select a company who is specialized in the same and opt for spring vibration isolators that best fits the applicational requirement. Consult with the specialist to help you with the selection of the spring vibration isolation hangers for your application based on the load capacity and deflection requirement. You will be clearly guided with the right dimensions and space availability along with the load and deflection requirements to make the right choice if you approach a professional vibration isolator manufacturer. So, whether you require spring isolators for chiller, fan or the complete HVAC system, you can find a wide range of options to suite your need.

Vibration isolator and spring isolators for isolation of HVAC system

Heating, ventilation, and air conditioning (HVAC) are technologies that provide indoor comfort to people.  Here the principles of thermodynamics and heat transfer is used to build and create an HVAC system. HVAC system is designed to provide indoor comfort and ensures proper ventilation in the closed environment. HVAC is one of the most critical element of inhabited structures, which includes offices, hotels and even residential skyscrapers. As the name specifies H (Heating) V (Ventilation) AC (Air Conditioning) has three central functions of heating, ventilation, and air conditioning. They are all interconnected as the systems is designed with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. Installation of HVAC system involves large number of ducts, chiller units, ventilation equipment’s and rotating components that is mounted on building structures depending upon the size of space and capacity of HVAC system. Since it involves plenty of moving and rotating components, it results in generation of noise and vibrations. However, there are a number of vibration isolators and spring isolators available in the market for vibration and noise isolation of these HVAC system.

Issue of vibration and noise is addressed together because they are closely related; making it essential to tackle both in one go. Vibration often originates from rotating machinery which tends to increase with time, as system components tend to wear off. One of the most effective method to isolate vibrations is by installing Vibration isolators equipped with damping pads or spring mounts for rotating machinery. Eliminating vibration completely through vibration isolators in HVAC is a tedious task, but it can be isolated to a point where its effects are very negligible and it doesn’t affect the efficiency of system.

Vibrational Isolators prevents high frequency vibration from entering the system and dissipates it by changing kinetic energy of vibration into a different form of energy. Methods of energy dissipation vary according to the dampening mechanism with which vibration isolators are built. In case of spring isolators, the vibrational energy from rotating elements is dissipated by the flexible steel spring which deforms and ensure minimum transfer of vibrational energy.

Spring isolators in HVAC prove to be very effective in case of HVAC systems. They are mounted on the ceiling, as dropped ceiling grids can become very noisy when subject to vibration. They effectively isolate and dampens the noise level offering a noise free surrounding. Vibration and noise can be addressed through prevention or mitigation. In structures that are under design phase, it is important to make sure that rotating elements like motors, chillers and ducts is properly sized and specified with adequate supports and mounted with Vibration isolators at effective locations. Spring isolators in general as an isolation equipment is highly durable and can withstand extreme environment. They are often used in varying applications including military applications. If rightly selected they form the best isolation equipment for the HVAC system.

 

Special seismic spring isolators for vibration isolation of HVAC equipment’s

Seismic Control Spring Isolators are equipment’s recommended for noise and vibration isolation. These equipment’s need to be installed in critical areas where industrial machines are subjected to the external forces associated with an earthquake. Other than that, these seismic control spring isolators are used for limiting the transmission of noise and vibration into the supporting structures adjacent to the supported mechanical equipment. So, with these seismic control spring isolators, motion during an earthquake that leads to displacement of life support and emergency equipment is limited, and further ensures that the equipment remains in position. These seismic isolators are specifically designed by professional engineers based on calculated anticipated forces and vibration isolation requirement for that particular machine.

Seismic Control Spring Isolators have steel housing assembly that help in the reduction of both lateral and vertical movement of the supported equipment during an earthquake. Simultaneously they also provide vibration isolation during normal operating conditions of the equipment. The restraining system are designed to withstand a force equivalent to 1.0 g in any lateral or vertical direction without any failure. Further, to facilitate servicing, these isolators are designed in such a way that it can be removed without having required to lift or otherwise disturb the supported equipment. Generally, seismic control spring isolators are customized to the requirement of clients. So, depending on the load and seismic code, an optional steel load spreader plate may also be applied for distribute the load across the concrete anchor.

Here are some of the special features of seismic control spring isolators

  • Seismic control spring isolators are equipment’s that offer an all-directional restraint with vertical limit stops.
  • They are specifically engineered to meet all the requirements for HVAC application.
  • The housing is well galvanized and powder coated for superior corrosion protection
  • Can be easily bolted or welded in place.
  • Springs are engineered to provide an additional 50% overload capacity.
  • The housings also provide a constant free and operating height to facilitate installation.
  • With the isolation of these isolators, equipment motion is limited in all directions, at the isolator

Seismic restraint isolators and seismic snubbers are equipment’s that are commonly used in a wide variety of industrial and commercial applications. This includes the air conditions, compressors, chillers, cooling towers, fans, coils, piping units, motors, blowers & much more. Further, equipment’s like the seismic isolators for the building are installed under & alongside application to prevent any kind of damage from the seismic force during an event of earthquake.

Take care of the HVAC equipment with suitable vibration isolators

Most of the tall buildings, skyscrapers, malls, office complexes, hotels, hospitals, and industries have the Heating Ventilation and Air Conditioning systems installed. Keeping in mind the vagaries of the temperature, it is almost essential to have the HVAC systems in

vibration isolators

vibration isolators

order to have the business progress smoothly. The HVAC systems are both voluminous and bulky and come with a number of moving parts. When the installed systems are running you can hear the noise that the equipment makes. There are a huge amount of vibrations generated which if unchecked can pollute the working environment in the building.

The vibration isolator design: The government regulations require that the HVAC equipment is placed on top of the building. The vibration isolator pads for HVAC equipment come in handy for such installations. The vibration isolators consist of an elastomer element that is bonded to a metallic plate or stud on which the HVAC equipment is mounted. The vibration eliminator HVAC is selected based on the load and deflection parameters. It is called a vibration eliminator as it does not allow the vibrations to pass from the moving parts to the floor or to the surrounding support structure. The vibrations are absorbed by the rubber element and the energy is dissipated into the atmosphere as low-grade heat.

Environmental protection: The choice of the elastomer material in the vibration eliminator HVAC is chosen based on the environmental conditions in which it has to perform. For neat and clean environments within the rooms and chambers, simple rubber compounds are suitable. However, for exposed environments like rooftops and industrial floors with oil and water, it is recommended to go in for neoprene vibration isolators. The metallic part can be galvanized or powder coated as per the customer requirements and the environmental conditions. For small air conditioners the vibration isolators are available with a threaded insert enclosed in a neoprene mounting pad. The air conditioner feet can be placed on the neoprene rubber mounts and tightened with screws.

Hanger arrangement: In many installations, it becomes necessary to suspend the HVAC equipment and ducting from the ceiling but above the false ceiling. This area lies directly on top of the working areas and needs a very good vibration control. The spring vibration isolators HVAC are the right choice for such applications. The vibration spring isolators

seismic isolation

seismic isolation

consist of rectangular metallic sheet housing with elastomer elements and a spring with a cap. The vibration isolator spring housing is suspended from the ceiling by using a wire or rod. The metal to metal contact is avoided through a rubber washer.  The ducting or equipment is suspended from a stud that passes through the hole in the spring isolator bracket, the bonded elastomer element and the spring. The stud is tightened with a nut on top of the spring cap.

Work concept of the isolator: The spring gets compressed under the weight of the HVAC equipment, while the elastomer element ensures that the vibrations do not pass on to the metallic suspension and the support structure. In the case of shock or excessive vibrations the vibration isolation spring is assisted by the deflection characteristics of the elastomer element. The spring vibration isolators HVAC are available as single and double deflection types to suit the desired customer requirements. Some vibration isolators are supplied with the springs in the pre-compressed condition from the factory itself. A scale is provided on the inside of the rectangular sheet metal bracket on which the deflection reading can be easily read.

Flexible arrangement: The hole at the bottom of the vibration isolator spring bracket is quite large and allows for a 30-degree arc variation. This allowance takes care of the construction errors which at times can cause problems in the installation process. Thus, the spring vibration isolator HVAC is a versatile hanger for use in the installation of the HVAC equipment.

Andre HVAC International Inc. has been in the field of HVAC vibration damping and isolation right from its inception year 2003. The range of products is very large and allows you to make a selection based on the load bearing capacity and deflection characteristics. The environmental conditions and space constraints also play an important role in the product selection. AHI also helps its clients by providing them with customized solutions wherever the need arises. Product catalogues and specification sheets are available on the website and on request in case the data is required by the client.

The dynamics of the spring isolators in their modern avatar

A lot of developments have taken place over a period of time in the spring vibration isolation hangers. In the initial years, pads of cork and rubber with a hole in the center were used as vibration damping materials within the hanger frame. Some of the spring

spring isolation hangers

spring isolation hangers

vibration isolators used the spring only for the desired deflection. It was much later that the modern spring loaded isolation hangers came into the existence. They have the single deflection and double deflection variants available to match the deflection requirements of the clients.
The construction of a spring vibration isolator is simple. It has a rectangular steel strip frame with holes at the bottom and top. A round pad elastomer is bonded to the metal frame at the bottom. A spring with a cap is placed on the elastomer pad. The part for which vibration isolation is required is suspended by a stud that passes through the bracket, elastomer and spring and is tightened with a nut on the spring cap. The hole in the bracket is so large that it allows a 30-degree angular freedom to the suspended part. Thus any variation in the construction or supporting structure is easily taken care of.
Like the bottom portion, the top of the spring isolator is also linked to the rigid structure through a wire or stud. The stud passes through the top hole in the rectangular bracket, round rubber pad, steel washer and is tightened with a nut. Here the rubber element ensures that there is no metal to metal connection and the structure is isolated from the hanger. The large diameter of the steel washer is a safety feature and in the case of a fire, even if the rubber burns the steel washer holds.
The features of the spring loaded isolation hangers are as follows:
• Adequate corrosion protection is provided to the rectangular steel plate housing by powder coating or galvanizing.
• The load capacity of the rectangular housing is tested at a multiple of 5 to the rated load capacity.
• Color coding is done to indicate the load bearing capacity and the deflection characteristics. The steel washer integrity is checked at 50 per cent overload conditions.
• As per the customer requirement, the spring vibration isolators can be supplied with the springs in the pre-compressed state from the factory.
• The spring vibration isolators are designed for a misalignment within an arc of 30 degrees.
• Neoprene is the preferred elastomer material for its capability to withstand tough environmental conditions.
• The spring isolators are easy to install. Direct mounting on the support structure or the stud rod is possible.

The spring isolators for HVAC are used to suspend the air conditioning equipment and ducting etc. from the ceiling or the support structure. The spring isolators HVAC work on the same principle as any other spring vibration isolator and can provide the desired spring deflection. The scale sticker on the bracket inside allows you to read the amount of deflection under load conditions. Based on the load capacity and deflection required you can easily make the choice of the right spring isolator for HVAC system. The spring

spring isolation hangers

spring isolation hangers

isolators for fans provide the ideal vibration damping with similar loads and deflections.
The chillers which are mounted on the floor are a very heavy piece of equipment. So instead of hangers, the spring isolators for chillers utilize the floor mounting techniques. Heavy springs are used along with the metallic brackets to suspend the heavy chiller tanks at the legs and other support points. Sometimes a set of springs is used in the same spring isolator to meet the load and deflection requirements. Since the flooring is isolated from the vibrations in the chiller tanks, the chillers can also be mounted on the rooftops to meet the regulatory guidelines.
If you are looking for spring isolators Edmonton or spring isolators in Houston, the right place to go is Andre HVAC International Inc. The company which came up more than a decade ago is highly specialized in the spring vibration isolators. The company website provides you with the data and tables for easy selection of the spring vibration isolation hangers. You have to clear on the dimensions and space availability along with the load and deflection requirements in order to make the choice. Whether it is the requirement for a chiller, fan or the complete HVAC system, you can find a wide range of the spring isolators in each category.