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

Operations and application of seismic mounts for industrial areas prone to earthquake

As per principles of law of conservation of energy, it states that energy is neither created nor destroyed, it is only transforms from form to another or transferred from one object to another. Based on these principles, Mechanical vibrations are nothing but just a form of energy interchange between kinetic and potential energy.  Even in case of vibrations, the energy from the source or creator (mechanical elements like motors, engines, pumps etc.) gets transferred to the adjacent elements like structure and other mechanical elements of the system. Vibrations are also often caused due to external factors like the earthquake which has a direct impact on machines. So, to protect industrial machines from such high frequency vibrations the structures need be equipped with equipment’s like seismic mounts.

Seismic mounts are widely used instruments in locations that are prone to earthquakes or seismic disturbances and considered a potential hazard. Seismic mounts help isolate and dissipate   vibrations caused due earthquake to ensure protection of installed equipment. Basic features of seismic mounts are to offer rugged/ rigid support through its fabricated steel construction and heavy duty stable steel springs. They are equipped with acoustic isolation pad which dampens seismic vibrations.  Seismic mounts for mechanical equipment are designed to combine spring mount vibration isolation with multi-directional flexible restraint to limit equipment movement under seismic disturbance.

In normal operating situations, the seismic mountings provide vibration isolation generally equivalent to open spring mountings but, when subjected to physical displacements such as those generated by heavy seismic forces, equipment motion relative to the supporting structure is restricted. When correctly selected, seismic isolators will allow conformance to the design requirements and offers strong stability to the structure. Seismic isolators are equipped with multiple options depending on the load and structural stability required at the given time. Strong housing combined with spring and rubber provides maximum isolation from seismic vibrations and safeguards loaded mechanical equipment’s. Depending upon the application and loading arrangement single steel spring loaded seismic mounts or multiple steel springs loaded seismic mounts are used.

The construction of seismic isolators offers maximum flexibility which enables easy movement and re-location of mechanical equipment while also offering maximum support and resistance to the high frequency vibrations. The housing shall serve as blocking and, restraining bolts have a neoprene bushing between the bolt and the housing. One of the most common construction includes hot dipped galvanized steel housing, oil-resistant high frequency spring base isolation cup and resilient rubber base cup to provide acoustical isolation from vibrating steel spring components. Since housings are bolted or welded in position, there is an internal isolation pad. Housing are designed to resist all seismic forces.

When selecting a seismic mount, it is recommended that the calculated mass of equipment is increased 10-20% to avoid overloading of any mounting. For equipment using more than four mountings, ensure to distribute and locate them so that each mounting has equal loading. If this cannot be done, mounting selection must be made on the basis of matching static deflections as closely as possible. Seismic spring mountings shall permit freedom of equipment motion at normal operating conditions but restrain the equipment from excessive motion when subjected to foundation displacement in any direction.

 

 

Seismic snubbers and isolators an ideal tool for vibration isolation and seismic restraint

Seismic snubbers and isolators are the most reliable and popular equipment’s used in the industry for the purpose of restraining mechanical equipment during a seismic event. These seismic snubbers are ideal for applications which require directional restrains from all sides. So, if you install a seismic snubber to your equipment’s, the snubbers will provide safety in all direction and further take care of errors in alignment and in case of minor shifting as well.

In general, seismic restraint isolators and seismic snubbers are designed in a way to be used in locations that are subjected to earthquakes and external forces that could possibly displace vibration isolators HVAC equipment. Machines and equipment on resilient supports such as spring, neoprene or vibration isolators need to be seismically rate to handle the high G force from all directions during such an event.  However, by using a well- designed resilient seismic snubber around the equipment or machine, motion can be limited and the machine can remain in place.

Other than that, seismic snubbers are mechanical device designed & engineered for damping of low frequency movements or limit the pressure & velocity of a machine. Mechanical Snubber is used to prevent shock & vibration forces that can cause damage in to machines and industrial equipment’s. They limit the load and high frequency vibration that could possibly affect the machine in which they are installed. So, basically when there is a disturbance that occurs, the seismic snubbers act as a resistant device, absorbing the energy and preventing the transfer of vibration, shock or any form of impact to the machine & reduce or eliminate the potential damage.

Structurally sound and rugged, these equipment’s have been designed to resist the imposed force from external sources yet allowing normal operation of the machine and limiting the transmission of vibration to the building. These seismic snubbers are equipment’s that features good shock & vibration absorption. These devices are simple isolation equipment’s that are easy to use, install and that require less or no maintenance. They provide you good resistance to high impact & radiation and are tools that take care of all the alignment errors in machines.

Seismic restraint isolators and seismic snubbers are equipment’s that are commonly used in various industrial and commercial applications like the air conditions, compressors, chillers, cooling towers, fans, coils, piping units, motors, blowers & much more. Further, 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. 

So, to avoid any damage to your machines and equipment’s due to the high frequency vibration, shock and external force impacts, we would recommend installation of seismic snubbers to your equipment’s for better protection. Depending on your requirement, look for best options by consulting the suppliers and buy quality seismic snubber for your industrial machines.

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.

The importance of seismic restraint isolators and mounts in everyday life

The seismic activity arising out of earthquakes, tsunami and terror strikes can result in heavy destruction and loss of human life. In hospitals and medical emergency areas, there are people who are on life support systems and any disconnection from the emergency equipment can result in the loss of life. seismic spring mounts Thus, the seismic restrained isolators are used for the mounting of emergency equipment and life support systems to restrict their displacement during an earthquake. The selection of the vibration isolators and their anchoring is normally designed by professional engineers.

Here are the characteristics of the seismic restrained isolators:

  • They provide restraint in all directions with mechanical stops in the vertical direction.
  • The equipment motion as measured at the isolators is limited to 5 mm in all the directions.
  • The free height and operating height is almost constant.
  • Adequate corrosion resistance is provided by the galvanized housing and powder coating on the spring.
  • The spring coils can be interchanged with ease in the work area.
  • Neoprene elastomer is used for the 3-axis snubbing element.

The seismic spring isolators are recommended for large and heavy equipment in seismic zones and wind prone areas. They are ideal for the equipment that is mounted on structural frames or concrete bases. The characteristic feature that allows for a near constant operating height makes the isolators well-suited for boilers, chillers, and cooling towers. The weight variation due to the movement of water in these types of equipment is well accommodated by these seismic restrained isolators.

The restrained seismic spring mounts are designed keeping in mind the dual function that they offer. They combine the vibration isolation feature with the multi-directional restraint to limit the movement of the equipment when seismic activity strikes. When the equipment is operating under normal conditions, the seismic spring mount behaves like any other vibration and noise control isolator. The difference becomes noticeable when it restricts the equipment motion relative to the supporting structure when this kind of displacement force is generated by the seismic activity.

Even in the non-seismic areas, the regulations require the seismic restraint of the mechanical, electrical and plumbing equipment. The seismic spring mounts and isolators are available to control the motion of the equipment, piping and ductwork during the seismic activity. You can seek professional help to calculate the anchorage, positioning, and size of the seismic restraints. This part is necessary to adequately restrain the equipment against seismic activity. The project architects and engineers can get in touch with the provider to work out the best possible seismic solution.

Andre HVAC International Inc. offers the wide variety of seismic restrained isolators and seismic spring mounts. They conform to the various standards and international seismic codes. AHI is in the field of vibration isolation and seismic spring mounts since their inception in the year 2003. The tables and charts available through the website allow you to calculate the static deflection and then select the seismic mount according to the equipment load. They also provide you with the necessary support and help to arrive at the right solution.

Seismic mounts and their application

Seismic mounts are mechanical equipment designed to combine spring mount vibration isolation with multi-directional flexible restraint to limit equipment movement under seismic disturbance. While under the normal working conditions, these mounting provides efficient vibration isolation that are equivalent to open spring mountings but, when subjected to Seismic mounts and their applicationphysical displacements such as those generated by seismic forces, equipment motion relative to the supporting structure is restricted. At the maximum restraint capacity of each mounting type the movement of equipment is limited to less than 12mm along the major axis.

There are a wide range of seismic spring mounts including rubber seismic mount that are used in various industrial applications. Also available are cable restraints, which are used in conjunction with spring or rubber hangers for the seismic restraint of suspended piping and equipment. So depending on type of machine in use and the deflection requirement, one can select the right seismic mount. When correctly selected, integrated seismic mountings will allow conformance to the design requirements of various applications and other International Seismic Codes.

While there are a number of seismic isolators available in the market is advisable to Refer to the Isolator Selection Guide to obtain the necessary static deflection and then accordingly select the seismic mount required according to equipment load. The dynamic factor needs to be taken into account for all RCMS seismic mounts. Seismic Mounts use high performance coil springs that make them effective at damping wide range of frequencies. The internal stoppers are strong enough to support structures during earthquake and strong winds. But for an effective impact it is critical to select the right seismic equipment.

Seismic mounts or isolators designed to restrain seismic vibration and impact are-:

  • The Rugged steel housing is designed to handle high wind and seismic forces.
  • The Housing serves as blocking during equipment erection.
  • These seismic equipment’s feature a top plate that may be welded or bolted to equipment; allowing flexible design options.
  • The Housing height of each series of equipment are identical within each series.
  • The seismic restrained spring isolators have easily accessible bolt holes that offer simplified installation.
  • These seismic restrained isolators are powder coated housings and springs offer outstanding corrosion resistance.
  • The springs of the seismic isolators are easily accessed for replacement if in case the loads change.
  • The spring mounts are Color-coded for proper identification of load capacity and simple inspection.
  • Also, featuring elastomeric acoustical cup allows the equipment for better vibration isolation.

Speaking of its application the Seismic isolators or seismic mounts are used in a various industries and installed in various industrial applications that include

  • Cooling Towers
  • Chilling Units
  • Buildings
  • Scaffolding.
  • Other General industrial equipment
  • HVAC equipment and fan assemblies
  • Pumps, chillers and cooling towers
  • Condensing units
  • Generator sets& many other such applications.

 

 

 

Important considerations for seismic vibration isolation

The seismic mounts and isolators are recommended for use with the mechanical equipment when it is subject to seismic occurrences, high wind loads and other external forces. The seismic isolators are pretty effective for noise and vibration sensitive areas when the mechanical equipment is located above or near it. The seismic spring isolators are very effective when the equipment for isolation experiences significant weight changes due to the fluid drainage during routine maintenance operations. The equipment that falls under this category is cooling towers, chillers and boilers etc.

The seismic vibration isolators consist of a welded steel housing that has a free standing, large diameter steel spring in the middle. The metallic housing has zinc metallization on it in order to protect it from corrosion.

Important considerations for seismic vibration isolation

Important considerations for seismic vibration isolation

The housings have elastomer members assembled which work in tandem with the spring member to provide the required damping effect. The housings are fabricated in such a manner so as to limit vertical movement of the isolated equipment. The vertical movement is generated if there is a reduction in load due to fluid drainage or increase in load due to large external forces like seismic events or high winds.

The top plate in the seismic spring isolator housing has threaded holes for anchoring the mechanical equipment. In certain situations, it becomes difficult to align the holes and welding is recommended. The snubbing element has the neoprene elastomer at its core. For heavy duty applications, the seismic vibration isolators have elements which can accommodate directional snubbing also.

Andre HVAC International Inc. provides the entire range of seismic spring isolators and seismic spring mounts for the mechanical equipment. They also help in carrying out computer studies for snubbing systems in earthquake and bomb blast zones. The HVAC vibration isolation solutions from Andre HVAC are guidelines that provide general seismic details for suspended piping, ductwork and electrical systems. There are special seismic mounts and independent seismic restraints for the HVAC applications. With the help of these mounts, you can secure the air-conditioning equipment, fans, ducts etc. to the building. The cable restraints also come quite handy for restraining the suspended pipe and equipment. The seismic spring mounts thus provide adequate protection from the seismic activity.

Thereis a variety of mounts available which primarily consist of a spring and an elastomer- neoprene. There are also wire rope and pad type vibration mounts and isolators. The seismic mounts comply with IBC regulations. The Amber booth vibration isolators have been used in HVAC, defense, transportation and OEM market for over 60 years. Amber booth is a member of the American society of heating, refrigerating, and Air-conditioning engineers, Inc. and Vibration isolation and seismic control manufacturers association. Andre HVAC International Inc. brings to you the entire range of Amber booth products to meet your specific requirements.

The seismic spring mounts are color coded to indicate the spring deflection and the load capacity. To meet the seismic code compliance, a spacer block is provided for the air gap setting. The Andre HVAC seismic spring isolators are designed to counter the seismic forces up to a value of 2G.

Seismic mounts an ideal isolation equipment of industrial machine against seismic force

Integrated seismic mounts are devices designed for mechanical equipment to combine with spring mount vibration isolation with multi-directional flexible restraint to limit equipment movement under heavy seismic disturbance. In normal operating environment, the mountings provide vibration isolation generally equivalent to open spring mountings but, when subjected to physical displacements such as those generated by seismic forces, the equipment motion relative to the supporting structure is restricted. At the maximum restraint capacity of each mounting type movement is limited to less than 12mm along any given major axis.

So, on selecting the right integrated seismic mountings it will allow conformance to the design requirements and other International Seismic Codes. Andre HVAC offers a wide range of seismic spring mounts for a full range of applications, as well as a rubber seismic mount, and independent seismic restraints. Also available are cable restraints, which are used in conjunction to spring or rubber hangers for the seismic restraint of suspended piping and equipment.

Selecting the correct seismic mount.

It is always critical to select the right seismic mount for your industrial application for effective isolation of vibration caused due to any seismic force. The dynamic factor needs to be taken into account while selecting for a seismic mounts. The seismic mounts are required to conform to AS 1170.4, for NZS 4219 the restraint capacity needs to be confirmed for the specific application.

Seismic mounts and restraints help control the motion of equipment, piping and ductwork during a seismic event. Proper sizing and placement of seismic restraints and accurate calculation of anchor bolt forces is critical in adequately restraining equipment against seismic effects.

Seismic mounts and restraints are designed in a way to provide the strength and isolation that is necessary to maximize the chances of these systems remaining intact and attached to the building structure. It is advisable that you consult with good engineers and architects to determine the best possible seismic solutions for your industrial application.

Seismic rated mounts and restraints that control the motion of equipment, piping and ductwork during a seismic event possess the following features

  • Rugged steel housing designed to handle high wind and seismic forces.
  • Housing serves as blocking during equipment erection.
  • Top plate are welded or bolted to equipment, allowing flexible design options.
  • Housing heights are identical within each series.
  • Easily accessible bolt holes permit easy installation.
  • Isolators are manufactured well to maintain consistent quality.
  • Powder coated housings and springs offer outstanding corrosion resistance.
  • Springs are easily accessed for replacement if loads change.
  • Color-coded springs offers proper identification of load capacity and simple inspection.
  • Elastomeric acoustical cup allows for effective and efficient vibration isolation.
  • Spacer block allows for ease of installation by maintaining the installed height of the equipment and setting the proper air gap for seismic code compliance.

All seismic isolators are manufactured by Andre HVAC are of high quality material. The standard finish on the housings and springs is powder coating and all hardware within the mounting are well coated for better resilience against environment exposure and galvanized for superior corrosion resistance.

What are seismic mounts & how to select a right seismic mount?

Seismic mounts are instruments installed in industries to control the motion of equipment, piping and ductwork during any seismic event that occurs. As per the new safety norms related to building code, it has become compulsory for historically non-seismic regions of the country to require seismic restraint for all Mechanical, electrical and plumbing equipments.

Andhre HVAC manufactures high quality Integrated seismic mounts for mechanical equipment that are designed to combine spring mount vibration isolation with multi-directional flexible restraint to limit the equipment movement under any seismic event.

In a normal operating situations, the mountings provide vibration isolation generally equivalent to open spring mountings but, when subjected to physical displacements such as those generated by seismic forces, the equipment motion relative to the supporting structure is restricted. At the maximum restraint capacity of each mounting type movement is limited to less than 12mm along any major axis.

At Andre HVAC, we offer a wide range of seismic spring mounts, rubber seismic mount, and independent seismic restraints etc for a full range of applications & industrial equipments. We also offer a cable restraint, which is used in conjunction with spring or rubber hangers for the seismic restraint of suspended piping and other suspended equipments.

How to select the correct seismic mount?

Selecting of the right seismic mount for your industrial equipments is very critical. In order to obtain the necessary static deflection, one needs to select the seismic mount in accordance to the type of equipment and its load. Various dynamic factor needs to be taken into account for all RCMS seismic mounts. Andre HVAC offers range of seismic mount restraint depending on capacity need that has to be confirmed for the specific application by the clients.

Seismic spring mount for effective seismic vibration isolation

Seismic spring mounts are vibration isolators with multi-directional flexible restraint that are designed to limit equipment movement under seismic force. These are well designed & integrated isolation equipment’s, engineered for various mechanical & electronic application. They are built on a heavy duty steel springs, Neoprene Snubbers & Steel Housing. Typically these equipment’s are used in indoor and outdoor mechanical & electronics applications for the purpose of isolation under seismic force caused due to earthquakes and wind loads. These seismic spring mounts are usually used for absorbing vibration & limiting the seismic forces for air handling units, centrifugal fans, pumps, chillers etc especially if these units are installed near by a seismic zone. With the ever changing norms & stringent laws for the necessity of life-safety precaution equipment’s, it has now become essential for all the non-seismic regions of the country to have seismic restraint for all the mechanical & electrical equipment.

These seismic spring isolators are seismic controls springs that are restrained by using steel housings.  They are designed in a way to limit lateral & vertical movements of equipment’s caused due to natural force of earthquake & assist in reducing the obstruction of vibration isolation of spring when the equipment are normally operating. Usually in a normal operating condition, the mountings provides vibration isolation that are generally equivalent to open spring mountings but, when subjected to physical impact that are caused by seismic forces, the movements of the equipment relative to the supporting application is limited. Appropriate structuring sizing and placement of the seismic restraints with precision & accurate calculation of anchor bolt forces are essential for adequately restraining equipment against seismic effects

At Andre HVAC we offer a wide range of spring mounting systems & equipment’s like seismic spring mounts, a rubber seismic mount, and an independent seismic restraints for a variety of applications to withstand the earthquake. The Seismically rated Restrained Spring Mounts are mainly used for floor mounted equipment, where as the Seismic Snubbers are used for floor mounted isolated equipment’s. We also provide seismic cable restraints, which are used in association to spring or rubber hangers for the seismic restraint of suspended piping, ducting and equipment. We also offer acoustic riser anchors, which also provide seismic restraint for pipe risers. These seismic mounts and restraints assist in controlling the movements of equipment, piping and duct work in case of a seismic event. AHI specializes in providing complete range of products like Seismic Vibration Isolators, Seismic cables, Seismic rod clamp for various deflection & isolation

The seismic spring mounts features, all directional restraint with vertical limit caps. With this equipment the motion are limited to 0.2” that is approximately 5 mm in all directions. Also to facilitate servicing, the isolators are designed in such a way that it can be removed without having the need to lift or stop the supported equipment. In short they can be removed even while the equipment is working. These seismic spring mounts are also powder-coated and color-coded for the purpose of corrosion resistance and ease of identification.