Monthly Archives: April 2018

How does a Wire Rope isolator help in dampening of vibration in a machine?

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As said “Every change is a challenge” same is the case of equipment’s which are constantly exposed to extreme weather and temperature. Often equipment’s in the

anti-vibration mount wire rope isolator

anti-vibration mount wire rope isolator

defence systems have to tackle the tough terrains, rough seas and air turbulence during their routine foray. Extreme conditions pose maximum effect on the working of machines and sensitive electronic devices. Even in industrial environment, machines are exposed to chemicals, oils and water which is quite harmful for equipment and machines. Further, effects of constant shock loads and vibration can lead to irreversible damage on equipment if not taken care off. This is when wire rope isolators come in the picture to effectively counter forces and protect sensitive equipment and machines.

The beauty of wire rope isolator lies in its simple construction and effective performance in providing necessary protection to all sensitive devices. Construction of these cable Isolators typically comprises of stainless steel stranded cable, threaded through aluminium alloy retaining bars or holding brackets, crimped and mounted for effective vibration isolation. There is a thorough scientific engineering that is behind the design of a wire rope isolator wherein various parameters are taken in to account to ensure its effectiveness. One of the core element in these equipment’s which is the stainless steel stranded cable, needs to be of specific diameter and diameter of loop to be suitable for specific vibration damping requirements.

The elasticity of the loop in a wire rope isolator acts as a spring which deflects under load and dissipates the vibrational energy from the source of vibration. This ensures minimum transfer of vibration to the corresponding elements and in turn protects them from any undue damage. By the general law of deflection, 5 to 15 per cent is what the isolators can take easily and deflect to suit the requirement. Some of the prominent characteristics that makes wire rope isolators the first choice is its ability to provide suitable deflection when stressed under load, offering high damping ratio.

Wire rope isolators offer adequate corrosive protection and capable to operate at a The compact wire rope isolator solutions in space constrained applicationstemperature range of minus 125 Degree Celsius to 350 Degree Celsius. Construction and built of wire rope isolators enables them to deliver the exact amount of isolation and damping to each application making it an ideal application to any machines or devices. The selection of the wire rope is extremely critical for any application involving the wire rope isolator. Several parameters are to be taken in to account when selecting wire rope isolators for vibration dampening and this includes diameter of the wire, number of strands, wire length, wire twist. For those machines with space constrain, compact wire rope isolator is the answer to it. The capacity of wire rope isolator is the number of strands per section that defines the deflection characteristics and damping capability. With construction comprised of stainless steel cable and aluminium alloy brackets makes this equipment long lasting and durable solution.

How are Spring hangers and isolators effective as vibration isolators in the industry?

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Pipes are equipment’s that help transfer fluids, gases, steam or industrial chemicals from one location to another. Pipes are usually circular in section however; its shape is completely based on the application and transporting fluid. Its shape, size and material are solely governed by the application of piping system in which it will be installed.

Piping spring hangers

Piping spring hangers

Pipes are usually defined or specified by dimensions of outer diameter and wall thickness. However, in many cases inner diameter plays a crucial role. Pipes tend to undergo thermal displacement while operating in variable temperatures. They tend to shrink while exposed to extreme low temperature and tend to expand while operated at extreme high temperature. Variable temperature results in pipe system displacements in vertical direction which can be compensated by installing equipment’s like Spring hangers or pipe spring hangers.

Equipment’s like spring hangers or pipe spring hangers are well equipped with a mechanism to compensate the thermal displacement of piping system.  They ensure flexibility of the pipe within specified range, allowing designer to design complex system for any application. Extent to which pipe undergoes vertical displacement is directly proportional to the spring rate and spring force in spring hangers. These equipment’s are capable of offering effective vibration isolation and acts as an ideal vibration isolator for all piping systems.

In case of HVAC systems where complex duct system is designed to connect chillers, pump and other types of equipment’s do also tend to vibrate. Constant vibration over the span of time tends to loosen all parts and finally causing the entire system to fall apart. Not just that this could even lead to safety hazard in the future for people working around it. For systems like these Vibration isolators are used for effective and efficient dampening of vibration and undesirable noises. These Vibration isolators also help in protecting the piping systems from receiving vibrations transmitted through the piping when operational. The vibrations can create problems not only for the designed piping system but also for the building’s structure or mounting arrangements. The vibration isolators like spring hangers help reduce or eliminate vibrations that are transmitted from source.

Application of these vibration isolators are not just restricted to piping systems but Spring hangers for your piping, HVAC, and ceiling requirementsequipment’s like spring isolators are used in systems like chillers, pumps, air handlers, and the other types of system which generates high intensity of vibrations when operated at optimum frequencies. Vibration isolators are usually rated according to the static deflection the vibration isolator provides for the equipment by means of countering mechanism. In case of HVAC piping system operating under variable temperature range, isolators equipped with springs in the pipe hangers are installed to avoid further issues caused by vibration. Depending on the location, vibration isolators are also rated for seismic activity with further specifications demanding for seismic restraints on the equipment and dependent piping arrangements. So, select vibration isolators as per the requirement of your application so as to achieve the desired results.

Effective yet reasonable rubber mounts for isolation of vibration from mechanical systems

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The age where we are constantly upgrading our technological system and focused towards developing highly precise and accurate manufacturing processes; isolation of machinery to prevent the transmission of vibration and noise is extremely critical. Vibration control proves to be efficient whenever the equipment is located on higher floor or next to quiet surroundings. Rubber mounts is primarily used for reducing the effect of the dynamic forces generated by moving parts in a machine into the surrounding structure.

Every machine during its operation creates vibration or shock of varying intensity or amplitude. In general, speed and vibrational forces share direct proportionality with each other. The requirements for isolating these vibrational forces purely depend upon the local conditions of installation and applications. There are three principle factors

Rubber isolation mounts

Rubber isolation mounts

which control the selection of a vibration isolator for a particular machine or application. The first is the weight to be supported, the second is the operating frequency of the machine and the third is the rigidity of the structure supporting the machine. Scientifically vibration is a resultant force and the role of rubber mount is to provide an opposed force which can effectively reduce the transmission of vibration to the other elements. To provide the desired isolation or dampening, rubber mounts need to be composed of truly resilient material, which when subjected to a static load, deflects and isolates the source of vibration from receiver.

Rubber isolation mounts are highly engineered yet very simple device, designed to isolate shock and reduce noise. The characteristics of Rubber isolator mounts determine its efficiency as a device for storing vibration energy and amount that it deflects under load. In case of shock isolation, rubber mounts dissipate the energy with each impact and ensures there is no transmission of energy. In case of noise, rubber mounts act as a resilient medium between the equipment and the structure. This breaks the path of structural borne noise which ultimately results in noise reduction of areas outside the machinery room and in the area around the machine.

Rubber motor mounts are used to reduce internal vibrations of the motors and its selection depends upon operating frequency or on the load of motors. Rubber mounts are available in various mounting arrangement and materials. The most widely adopted type of rubber mounts are cylindrical mounts & metallic mounts which offers optimum vibration isolation and dampening. In general scenario, where the amount of load is less, rubber mounts made up of natural rubber are implemented. Whereas under critical scenario, where amount of load and operating frequency is on a higher side, synthetic rubber mounts are implemented as the deflection/ isolation offered by synthetic rubber is much superior as compared to natural rubber. Rubber mounts acts as a buffer between source of vibration and receiver of vibration and the capability of rubber isolators defines the stability of entire structure. The Shape, size, location and construction of mounts vary and solely depending upon the type of application. Right from washing machine to heavy engine and motors, rubber mounts play a crucial role. Rubber mounts prove to be one of the best and cheapest critical component in tackling unwanted vibrations and noise.

 

Effective spring anti-vibration hangers for vibration and noise dampening to the ceilings

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Ceilings are one of the important elements of an interior space and hence an important element of an open plan office layout. It defines the overall aesthetics of a working environment and offers better working atmosphere. To keep up with rapid urbanization

Piping spring hangers

Piping spring hangers

in fast-growing markets and aging construction in mature markets, the industry started to build better office layout. Architects are now adopting concept of false ceiling and experts are in turn facing another set of challenge for accommodating air conditioning ducts and wire trays. As we all know, vibration from air conditioning units travel through ducts and percolate into the ceiling where it is mounted. To tackle this issue equipment’s or devices like the anti-vibration hangers were innovated.

The role of anti-vibration hanger is to isolate the ducts from vibration and offering a vibration free and noise free environment. The most common construction of anti-vibration hanger consists of a galvanized sheet metal frame, constructed with lateral strength. The rubber pad at the bottom of the spring acts as a sound break and increases isolation efficiency in high frequencies. The steel spring faces the low frequency excitation. It can be easily mounted to the true ceiling by means of simple fasteners and tightened to provide sufficient strength.

In general, anti-vibration hangers act as a buffer layer between vibrating ducts and true ceiling to limit the transfer of vibration.  These vibration hangers are widely adopted in construction industry due to it simplistic design and installation. Several technological developments have led to the designing and innovation of these effective Anti vibration hangers. Currently isolation hangers are available in three different constructions namely-

  • Spring anti-vibration hanger– A spring hanger that consists of a combination of anti-vibration rubber with metal spring, offers effective vibration isolation.
  • Rubber anti-vibration hanger– A combination of special rubber with metal spring for vibration isolation of low and high frequency noise heard by the human ear.
  • Regufoam anti-vibration hangers- Anti-vibration hanger with Regufoam for antivibration suspension of machinery like ventilators, air conditioning etc.

The construction and built of spring hangers comprise of steel springs in sturdy steel housings which supports and holds the dampening springs. Top and bottom elastomer cups have vulcanized steel washers for uniform load distribution. Spring hangers are used in applications as diverse as the hanging fan coil units, air handling units, fans, pipes, ducts and other suspended structures and building services. It offers uniform load distribution and angular alignment providing flexibility as required in construction field. These spring hangers are normally used for critical areas where noise and vibration both needs to be controlled. Simplistic design and easy installations offers effective and efficient solution to the vibrational and acoustic problems.

Application of air compressor mounting pads for isolating compressor units of an industry

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Air compressors is the heart of a pneumatic system, which acts as a source for high density compressed air for activating the entire system and to generate the desired output. A basic pneumatic system consists of control valves, pipelines & pipe fittings and pneumatic accessories which is all activated through single source of compressed air generated from air compressor. Theoretically, an air compressor converts electrical energy into kinetic energy in the form of the air; it reduces the volume of air and induces pressure in the air through certain mechanical arrangement. These air compressors are widely used for Industrial and non-industrial applications. It can be widely seen in railways where it’s the core element in braking system and in agricultural accessories like dusters and sprayer. In general, compressors applications are not restricted to any particular industry, rather its solely depends on the application. Air compressors are classified according to method of energy transfer and pressure generation i.e. positive displacement and dynamic compressors.

  • Positive displacement compressors work on the principle of increasing pressure of air by reducing the volume of air.
  • Whereas, Dynamic compressor works on the principle of imparting the energy by rotating vanes of impeller on air flowing through casing that increases pressure in air.

Air compressors are excellent and cheap source of energy for any application. However, they also generate another form of energy which is called Vibrational energy. The vibrations we feel and its intensity is dependent on proximity to the source, as well as other variables in the particular environment. As soon as vibrational energy from source comes in contact with mounting surface, a portion of the waves are absorbed into that surface, while a remaining portion is deflected back resulting in vibrations. How effective a surface can absorb that sound is dependent on the material from which it is made off or how well it is isolated from the source. Methodology applied to isolate the source of vibration system i.e. air compressor from the receiver is called Anti vibrational control. There are several ways to reduce the effect of vibrations and provide effective dampening. But one of the cheapesr, effective and efficient method is to create an isolation by means of installing Air compressor mounting pads.

Compressor Mounts are specifically designed to insulate and avoid transfer of vibrations from air compressor to mounting floor. It forms a layer between compressor and mounting floor, which scatters the vibrational energy resulting in peaceful working environment. It not only reduces the transfer of energy but also reduces the level of noise while operation of compressor. Air compressor mounting pads simplifies the installation process which enables quick and fast pace installation of compressor unit. This air compressor mounting pads are fabricated from highly engineered material with complex structural arrangement to control vibrations at optimum level. They possess an exceptionally high coefficient of friction that provides effective stability to the compressors. Size and shape of air compressor mounting pad depends on the application and size of the machine. Air compressor mounting pads is the simplest and the most effective approach to build  a vibration free system.