Seismic mounts and isolators for vibration isolation in HVAC equipment’s

Seismic Control Spring Isolators are typically used in equipment’s that are operating at high frequency and subjected to noise and vibration isolation. Seismic mounts are widely installed in critical areas where industrial machines and equipment’s are

Seismic mounts and isolators for vibration isolation in HVAC equipment’s

Seismic spring mounts:

subjected to the high frequency and unpredictable external forces associated to earthquake. As the name suggests, seismic mounts are not just associated with unpredictable vibrational force, but rather seismic spring isolators are used for limiting the transmission of noise and vibration into the supporting structures adjacent to the supported mechanical equipment.

The seismic isolators high damping capability provides a sound free and safe environment. The working principle of these mounts are extremely simple.  The motion caused during an earthquake which leads to displacement of structures and equipment is limited by these seismic mounts and further ensures that the equipment remains in position offering stability and safety.  These seismic isolators are specifically designed by professional engineers based on calculated and anticipated forces. They then develop equipment’s for vibration isolation based on the requirement of that particular supporting machine and various other parameters.

Construction of seismic spring Isolators comprise of steel housing assembly that help in the reduction of both lateral and vertical movement of the supported equipment during an earthquake. Simultaneously this mount provides vibration isolation during normal operating conditions of the equipment, offering maximum stability. The restraining system in seismic mount is designed to withstand the force from any lateral or vertical direction. In addition to this, these equipment’s are easy to install and doesn’t require the supporting machine to be lifted or disturbed. Generally, seismic spring isolators are customized to the requirement of clients. Depending on the load and seismic code, an optional steel load spreader plate may also be applied to distribute the load across the concrete anchor. Some of the special features of seismic control spring isolators which makes it a suitable choice for any industrial or commercial application includes-

  • Seismic control spring isolators are equipment’s that offer an all-directional restraint with vertical limit stops.
  • They are 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

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.

 

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.

 

Wire rope isolators for dampening of vibrations from industrial machines

One of the simplest descriptions of vibration isolation is the act of isolating a device, machine, or structure from its source of vibrations. Vibrations which is desirable in many application, plays a critical role in the industry. However, vibrations beyond a certain level can also be harmful for many applications and engineering systems. Effects of

compact wire rope isolator

compact wire rope isolator

vibrations could affect the life, stability and performance of any engineering system or structure. But with right isolation equipment’s like the wire rope isolatorsfor vibration dampening can help you control or rather limit the levels of vibration in a given system.

The mechanism of vibrations is to generate mechanical waves which travels or transfer to the mechanical chains to the elements of mechanical linkages. Technological advancements have devised two separate approach to tackle this undesirable vibration and reduce its effect for improved stability and performance. One of the approach which involves high investments of installing sensors and expensive actuators that generate disruptive interference to counters the mechanical vibrations. The method of countering mechanical vibration through sensors and actuators is grouped under Active vibration isolation. On the other hand, the second approach involves installation of material and mechanical elements that absorb and damp the undesirable vibrational energy. The method of isolating vibration by installation of dampening element is grouped under Passive vibration isolation. Passive vibration isolation offers minimum vibrational energy transfer at extremely low cost as compared to active vibration isolation. Various materials and mechanical elements that come under the passive vibration isolators includes equipment’s like the vibration isolation pads and wire rope isolators.

Wire rope isolators are devices that offers maximum resistance to the flow of vibration energy.  Standard wire rope isolators are constructed from stainless steel stranded cables, threaded through aluminium alloy retaining bars that are mounted for effective shock and vibration isolation. Its high corrosion resistant property and all metal construction makes wire rope isolators stable, high performing vibration isolators that are resistant to temperature extremes, chemicals, oils, ozone and abrasives. Design and construction of wire rope isolator ensure maximum performance and stability in industrial and defence applications. Applications which require high vibrational isolation in minimum space, compact wire rope isolators are adopted.  Compact wire rope isolators are generally lesser in dimensions as compared to the standard wire rope isolators, these uniquely designed wire rope isolators provide cost-effective, shock and vibration attenuation in areas where space is a major constraint.

anti-vibration mount wire rope isolator

anti-vibration mount wire rope isolator

They are very easy to install and offer single point installation. Unique in design and ease to install makes them versatile and easily adaptable to any applications. Unique compact design permits them to offer vibration isolation to single element in the system and ensures maximum isolation to the source of vibrations. The beauty of this smaller dimensions makes them an ideal choice for use in sensitive equipment’s and electronic devices.

While selecting a vibration isolator take in to account the level of shock and the average stiffness and deflection required in a Wire Rope Isolator. While robust construction of standard wire rope isolators offers complete stability to the entire mechanical system, the compact wire rope isolator is capable of providing isolation to the smallest element in system. Such wide range of flexibility offers free hand to designer for building a highly stable, effective and efficient system.

 

Spring hangers for providing effective support and isolation to piping systems

Pipes are considered as the medium for transportation of fluids from one location to another. They are widely used as travelling medium for oil and gas, water, steam, chemicals etc. Pipes vary in sizes depending upon the type of application and

Piping spring hangers

Piping spring hangers

transporting agent. It is extremely critical to build a robust piping system as any leakage will lead to irreversible damage. One of the most critical elements in designing of a piping system is the Spring hangers.

Any pipe line operating at high temperature tends to move upwards/downwards due to thermal expansion. In such a scenario a spring supports provides continuous support during expansion or contraction of the pipe. The spring support basically employs a spring element, which can get compressed or stretch-out depending upon the thermal movement of pipe and the corresponding loads. Spring hangers form an integrated part of Piping Industry. They are used for supporting pipe weights and building a safe piping system.  So, in cases where some rigid supports are not taking the load due to its thermal movement or rigid supports affecting the equipment connected to the pipe, experts suggest the use of a spring hanger to share some of the loads and to keep the system safe.

One needs to select an appropriate type of hanger for supporting the given application which is governed by the individual piping configuration and job requirements for which it is designed. Spring hangers are widely classified in two specific categories and they are as follows-

  • Variable Spring Hanger – Variable spring hangers are used in cases where loads vary throughout its operating range. Spring Hangers like these are used when vertical movement of the piping system isn’t allowed to be restricted by rigid hangers. Its unique construction is particularly suitable for use in severe corrosive conditions. Variable Spring Hangers are devices that allow a degree of flexibility in the supported equipment.
  • Constant Spring hanger – Constant spring hangers are used in cases where load remains constant throughout its operating range. Spring Hangers like this offer constant support to pipes and equipment subjected to vertical movement due to thermal expansion at locations where maintaining a constant stress is an essential factor.

While spring hangers are equipment’s used for supporting heavy pipes and piping system, duct hangers are equipment’s that are specifically designed to support duct systems. They are equipment’s used for altogether different application with the Spring hangers for your piping, HVAC, and ceiling requirementscomplete different mounting arrangement. They are used for effectively holding and supporting FRP or PVC ducts and are available in very simple designs that offer maximum duct support. The most common type of duct hanger is Tear drop duct hanger and Saddle type duct hangers that are precise and provide secure anchoring of any ducting system.

Applications where pipes are suspended, the piping arrangement is provided isolation hangers. It is used for suspended piping and ductwork to prevent vibration transmitting to the surrounding structure.  The capacity, construction and hanger material vary and can be made according to the application load. These equipment’s are widely used in multi-storied buildings and high temperature piping systems, providing flexibility and vibration isolation where there is height constrain and where there is better acoustic required. In general isolation hangers are most common used while designing piping, ducts, fans, fan coil units etc.