Antivibration isolators & spring mounts for isolation of reciprocating industrial machines

Spring mounts are essential isolating equipment’s used in most industrial machinery which by virtue of their design have reciprocating or rotating parts that creates vibration. The vibration caused is usually said to occur due to the imbalance of the moving parts of the machine. Vibration produced by machine leads to different problems, such as a reduction in the shelf life of the machine due to the wear and tear of the parts. Further, transmission of this vibration to other non-insulated adjacent structures give rise to high frequency noise. Therefore, it is very important for us to install spring mounts for isolation of machinery.

HVAC spring mounts

HVAC spring mounts

In any given industry, where vibration and noise are an issue one can virtually eliminate structurally transmitted noise and vibration by installing spring vibration Isolators. Accurately selecting and installing the right spring vibration isolators or spring isolation mounts offer the greatest assurance of elimination or isolation of vibration and noise to a great extent. Ideally these anti-vibration spring mounts should be installed in machines where maximum vibration and noise control is needed. Generally, isolation mounts are most frequently required in upper building spaces, rotational equipment’s and machines with rotational speeds below 1200 RPM.

When installing equipment on vibration sensitive building spans it is essential for you select anti-vibration spring mounts with higher deflection to cancel the effect of the span’s deflection. The spring mount vibration isolators selected must have a static deflection which must be at least three times more than the floor span deflection so as to ensure effective vibration control. Spring mounts with very low natural frequency are primarily used for vibration isolation in a wide range industrial applications where low excitation frequency vibration control is need.

anti vibration spring mount

anti vibration spring mount

Usually, in a spring vibration isolators single multiple coil springs combined with rubber elements at the base are used to increase the vibration isolation efficiency, especially in high frequencies that transmits through the metal springs. Antivibration spring mounts are primarily used for low frequency vibration damping of applications like air handling units, cooling towers, chillers, reciprocating engines, air compressors, etc. Spring mounts in general are available in a wide variety and range which includes open, enclosed or restrained. One could even opt for acoustic spring mounts having deflection up to 150mm deflection which are available in a variety of designs to suit different installations. Depending on where there are wind loads or where equipment moves in different patterns, such as during an engine start/stop cycle based on the requirement one can opt for spring isolators hvac accordingly.

 

Spring mounts for vibration isolation and dampening in industrial areas

Vibration is caused due to the movement or motion of machines in operation. The object which is in motion is usually the driver and the object which is influenced by the driver is the driven. The transfer of this vibrational energy invites un-stability in the system and increases wear and tear of components. To restrict this flow of vibrational energy, a flexible material between the driving object and the driven object is installed. This flexible material is nothing but a vibration isolation equipment that helps limit transfer of high frequency vibration from one object to another. If the right kind of vibration isolator is used, it will surely provide the desired results for which they are installed. Vibration isolators with little damping properties are capable of extreme reduction of vibration transmission at higher frequencies.  

There are two types of vibration isolation applications. The first type is designed to reduce the transmission of vibratory forces from a piece of equipment to the foundation on which it is mounted. The vibration isolation of reciprocating engines, large fans, electric motors, etc. are examples of this type of isolation application. The second type of vibration isolation device is designed to reduce the transmission of vibration velocity or amplitude to the piece of sensitive equipment that is mounted on the floor or to another structural member. Depending on the requirement and application in use, one needs to select a vibration isolator that suit their needs.

Some typical materials used for vibration isolators are elastomers, elastomeric foam, cork, felt, fiberglass boards, and steel in such forms as springs, pads, cables, etc. Among all the of these materials, spring isolators are the most in demand for its effective properties and features. The essential features of Spring isolators are that they are resilient load-supporting member (stiffness) and energy dissipating devices (damping). However, in certain types of isolators, the stiffness and damping functions are provided by a single element as in the case of elastomers, elastomeric foam, glass fiber boards, wire mesh, and wire cable isolators. Compared to rubber or elastomers mounts, spring isolation mounts have increased static deflection, resulting in greater isolation efficiency. This makes them more suitable for critical applications, or for mechanical equipment which have low disturbing frequencies.

Spring mounts come in a range of deflections and maximum loads, so that the level of isolation can be accurately selected for each application. Springs isolators are widely used in HVAC system since, HVAC units have many moving parts, including fans, which cause a lot of vibration. These vibrating elements in HVAC acts as a source of vibrational energy which is transferred to the other elements internally as well as externally. External elements affected by the vibrational energy are usually the foundation or structure on which HVAC system is mounted.  It is extremely crucial and essential to isolate this energy to ensure better stability of base.

Spring isolators for HVAC vibration are ideal for creating a buffer between the HVAC system and the base on which they are mounted. Construction of these Spring vibration isolators vary depending upon its applications and vibrational energy which it needs to isolate. In certain scenario’s more than one spring isolators are mounted to provide effective buffer in between driver and driven elements.

 

Anti-vibration spring mounts for isolation of industrial equipments

Why are spring mounts required for vibrating application?

Anti-vibration mounts or spring mount are essential for machines that have rotating parts and causes vibration due to the imbalance of the moving parts. The vibration produced by machines lead to problems, like short life span of the machines due to the wear and tear of its parts, transmission of vibration to adjacent structures, giving rise to problems of noise and vibration. Therefore it is important to install vibration isolation springs to machines to isolate any form of vibration and noise.

 

Spring mounts offered by Andre HVAC Inc

Spring Mounts are high performing anti-vibration mounts offering efficient isolation of machines and protection of sensitive equipments. As compared to rubber mounts, spring mountings feature high static deflection resulting in greater isolation efficiency. This makes it ideal for critical applications of equipments that have low disturbing frequencies. Designed of aluminum housing these vibration isolation springs mounts are sturdy, weather resistant and most importantly offer maximum vibration isolation. Vibration isolation springs or mounts come in a wide range of deflections and maximum loads. So, depending on the requirement of isolation you can select an anti-vibration mount for each application. Andre HVC Inc offers spring mount that are reasonable and highly durable.

Features & Benefits of Spring Mounts

Given below are some of the benefits or features of spring mounts offered by Andre HVAC Inc –

  • Heavy duty stable spring mounts
  • Outstanding vertical shock and vibration isolation
  • High quality spring mount isolators
  • Resistant to oil, chemical, moisture etc.
  • Robust, durable and reliable isolator

General Applications of Spring Mounts

 Anti-vibrations mounts or spring mounts are isolation equipments used across different industries. These vibration isolation springs are used in applications like compressors, pump sets, power generators, CHP units, HVAC Units, Industrial washing machines, scientific or testing equipments, measuring equipment etc.

Selecting the correct Spring Mount

Before buying or ordering spring mounts you need to understand the type of spring mounts required for the application. Determining whether a lateral or vertical restraint is required is essential for effective isolation of equipment. Next you need to calculate the amount of static deflection to choose the appropriate anti- vibration mount. Once the type and deflection are decided, determine the weight of the application to select the spring required to bare the load.

Introducing the newest Seismic spring mount for effective vibration isolation

Seismic isolators offered by ANDRE HVAC International

ANDRE HVAC International has a wide range of seismic isolators to reduce the transmission of vibration and high frequency noise coming from a variety of applications and industrial machines like fans, HVAC equipment, piping, duct works and other industrial machinery. Our seismic spring isolators are designed in a way that helps limit the issue of vibration and noise while offering increased productivity, stability and most importantly longer life of the equipment. 

Seismic spring mounts, rubber seismic mount, and independent seismic restraints offered come in a complete range for various applications. In addition to this, ANDRE HVAC International offers cable restraints which are used with spring and rubber hangers for restraining of seismic affect on any suspended piping or any other equipment.

Variety of seismic mounts

Seismic spring mounts comes in different configuration that are captive, housed and snubbed for floor or stand mounted equipments. These seismic isolators are designed with special multi-directional and flexible restraint to limit equipment movement during sever seismic disturbance. Besides this, during the normal operation, the seismic spring mountings provide vibration isolation in case of equipment movement and displacement causing high frequency vibration.

  • Seismic spring mounts Seismic spring mounts are vibration isolators that limit vibration & restrain seismic forces that affect air handling units, fans, pumps, chillers and other applications that are installed in a seismic zone. These seismic spring mounts are ideal equipments for large application that are often subjected to external environmental factors like wind or seismic forces. The mounts offered are powder coated and galvanized for a long lasting life.  
  • Seismic snubber Seismic snubbers are the best and the most effective way of vibration and seismic control. This equipment is nothing but an open spring and seismic snubber combination that helps in limiting vibration and affects of seismic force on applications. During the normal operation these snubbers do not interfere in the working of the application. These equipments or snubbers are ideal solution for post seismic disaster wherein the application is required to be functional after a seismic event.
  • Seismic cable restraint Suspended applications that require restraints, seismic cables are an ideal option. These cable restraints require no training for installation, have welded options for attachment, and are well designed to withstand seismic forces at maximum rated load. 

 

Strengthen your protection system with equipment isolation mounts

Vibrations can lead to a severe damage to your working systems, precision machines and your HVAC equipment. An effective deployment of hard rubber mounts and isolation mounts is needed to guard your equipment. Every machine or piece of equipment has its own natural frequency. When the induced vibrations from motors, fans, pumps etc. cause it to vibrate harmoniously at its natural frequency, resonance is created and produces a

heavy noise. The result is a loss of precision or damage to the machine. The equipment isolation mounts and hangers separate the equipment from the vibration source, thus bringing the damage under control.

Rubber anti-vibration mount: A properly installed hard rubber mount will lead to a reduction in the vibration and noise generated by the machine. The rubber anti-vibration mounts are responsible for creating a flexible connection to the machine. The energy from the

Automotive rubber mounts

Automotive rubber mounts

equipment is transferred to the equipment isolation mount which dampens the vibrations. The hard rubber mounts limit the level of amplification of the resonant frequency by dissipating energy in the system. The amount of damping must be kept under check, as an increase in damping tends to reduce isolation at higher frequencies.

Grommets rubber: We have sensitive instrumentation in our labs, homes and industry and it requires protection from vibration and shock. The anti-vibration grommet rubber is specially designed for these applications. These vibration absorbing grommets are made up of two parts, the insulator and the shoulder screw. The raw material used for the insulator is EPDM rubber, thus providing it with the requisite durability. The protrusions on the mating surface of the insulator provide the resilience to dampen unwanted noise and vibration. The instrument is anchored to the surface with the help of nickel plated screws.
Fan rubber mounts: Fans, like any other rotating piece of equipment, generate vibrations. Fans are like any other rotating part and generate vibrations. The fan vibrations can significantly become noisier when there is a rotor dynamic balancing problem. The fan rubber mount is quite effective in isolating the fan vibrations from the support structure. Thus, the support structure stays protected from vibration damage and noise is greatly reduced.

HVAC rubber mounts: The neoprene based HVAC rubber mount is ideal for mounting the air conditioner and HVAC equipment on the rooftop. The rubber mounting has a tapped hole in the center of the rubber mount and a flanged base plate. The whole rubber mounting is neoprene rubber based allowing for good corrosion resistance and deflection

Rubber  isolation mounts

Rubber isolation mounts

properties. Whether it is a fan rubber mount or an HVAC rubber mount, both offer excellent noise control and vibration damping properties. The other HVAC equipment like the chillers and air handling units etc. are also mounted on the support structure with the help of rubber HVAC mounts. However, in case the HVAC equipment or the ducting is required to be suspended the HVAC rubber hangers or the spring hangers are preferred.
Cylindrical vibration mounts: The cylindrical vibration mounts are very similar to the other hard rubber mounts but only different in shape. As the name suggests the round cylindrical profile allows for easy placement and installation. There are plenty of variants of the cylindrical mounts. There is one with a threaded metallic insert bonded to it while the other has a threaded stud protruding out. The insert or the stud is used to fasten the equipment to the cylindrical vibration mount. The elastomer element remains in contact with the support structure or floor and generates enough friction to prevent the running equipment from moving. The twin-stud cylindrical vibration mounts have the threaded studs on each side with the elastomer in the center. These mounts are used to connect two pieces of equipment without the transfer of vibrations from one to the other.

Andre HVAC International Inc. made a modest beginning in 2003 and has grown from strength to strength over the years. As the name suggests the rubber mounts and isolators for HVAC equipment were the initial offerings from the company. Andre HVAC International Inc. is well known in the area of HVAC rubber mounts. The building owners work in tandem with AHI for installation of heating ventilation and air conditioning systems. The range also includes the anti-vibration fan mounts, cylindrical vibration mounts and grommets rubber. The hard rubber mounts and equipment isolation mounts are so well accepted in the market that they have spurred the growth of the company into rubber anti-vibration mounting range of products.

 

Selection and Performance of Vibration isolation equipments

What is deflection and why is it a significant factor in isolation selection?

Deflection can be described as the change in a flexible elements unloaded to loaded height. It is the deflection that is the determining factor as to how well the isolator works. More deflection equals to less vibration transmission. There are mainly three classes of vibration isolators based on deflection they are as follows:

  1. Isolation Pads: These isolators deflect the least hence they are more suitable as a noise breaker. Isolation Pads tend to have hard surface-to-surface contact and so reduces high level frequency vibration.
  2. Neoprene mounts and hangers tend to deflect much better than isolation pads and are therefore area better isolation vibration control option.
  3. Spring isolators have the best deflection for maximum vibration reduction.

Structural and location factor

Structure and location plays a very critical role in deciding on equipment and this especially important for isolating suspended equipment.   Sensitive Structural Supports Require Greater Deflections. Location of equipment in the building is the main decisive factor for selecting either neoprene mounts or springs. While Neoprene mountings are satisfactory under equipment on a very stiff support structure such as a ground supported concrete slab. On the other hand, upper building levels where the structure can be very sensitive to vibration, springs are necessary. The key to proper isolator selection in upper levels is to make sure that the isolator deflection is much higher than floor deflection. If equipment is running below 1200 rpm, springs are required regardless of location.

To select a suitable Isolation for mechanical equipment in a particular applications one need to find out

  • Whether the equipment speed is above 1200 rpm and if not, use spring mountings. Vibration from equipment running at slow vibration speeds can pass through low deflection isolators and could possibly amplify.
  • Whether the equipment is placed on a concrete building structure or a flexible vibration sensitive structure. If in case placed on a rigid structure use double deflection neoprene or springs are the best form of isolators and if in case flexible use springs. Ideally deflection of isolator should be more than three times the deflection of the support.
  • Whether equipment’s have corner weight or weigh at each mounting point.  Always the load rating of each spring or rubber mounting should match to the portion of the equipment’s weight at the corners or mounting points. Equipment corner weights usually differ and require mountings with different load capacities. Oversized mountings may be possibly reducing vibration control. Hence select mountings with load capacities equal to or slightly greater than the portion of the equipment weight is always advisable.

Andre HVAC high freqency vibration and shock isolation equipments

Vibration, high frequency noise & instability of the machine, shorten the life of any equipment if not maintained well. Spring mounts are equipments that are designed in a way to diminish these factors. Compared to the rubber mounts, spring mountings have a much more static deflection, resulting in greater isolation efficiency. This makes them much more suitable for all the critical applications, or industrial machinery which has low disturbing frequencies. There are range of spring mounts that come in variants of deflections and maximum loads. So depending on the level of isolation one can accurately select the right spring mounts for each industrial application.

AHI offer a broad range of spring isolation mountings and hangers that limit the transmission of vibration of a variety of applications right from Pumps, Fans, Cooling Towers, Rooftop Units, Chillers, Boilers, and Compressors to heavy duty HVAC equipment and industrial machinery. These Anti Vibration Spring Mounts are easy to install and also possesses various features depending upon its application.  AHI manufactures Spring Mounts that include both Single Spring mounts and multiple Spring Mounts.  AHI also offers Anti Vibration Spring Mounts as per the specifications of the customers. There are a variety of spring mounts that are either metal based, rubber based or even a well cased spring mount depending on their application & usage.

AHI are specialized in the area of Spring Mounts & are the best source of a well performing Spring Mounts that provide a long lasting service. AHI engineers and develops the most extensive range of Spring Mounts in the market. They are also well know for  manufacturing a number of vibration isolation and controlling pad, Spring Mounts, pneumatic mounts and a variety of vibration mounts.

AHI manufactures high quality Spring Mounts that provides an ideal solution for high frequency vibration & noise. These Mounts are made from a combination of high quality spring and highly adhesive fluid that helps provide better performance. These Spring Mounts are products that have excellent resistance to ageing, compression set and rigorous wear-tear. These Spring Mounts are widely used in Power Presses, Refrigeration Plants and Compressors, Air Conditioning Plants and Gensets on rooftops of hotels etc. They feature stable spring design for better performance, Non skid elastomeric acoustical pad base, a Leveling Bolt for easy installation & a Neoprene rubber base for effective noise isolation. Also the springs are coated with a Corrosion preventive solvent with color coded & a powder coated material to it.

The Advantages of spring mounts are that, they are high freqency vibration and shock isolation equipments that provide better structural safety, reduced ware out of the machine & in turn extend the life of the machinery. They also provide a more congenial working environment. The installation of these spring mount are reliable & long lasting.