Spring hanger isolators protect the support structure from vibration damage

Today, the buildings and structures are designed not only with architectural excellence but also with a lot more factors in consideration like the seismic constraints and vibration dynamics. In general, the people have also become aware of the damage caused by the vibrations. The designers take care of these aspects or make recommendations for vibration protection when they design a new product. The industries buying new machinery and equipment also install the right kind of anti-vibration mounts and isolators before they install the machines. The HVAC systems, piping and ducting also need to be isolated from the structure to prevent damage due to vibrations. Keeping this in mind a few vibration damping product details have been brought out here.

Hanger vibration isolators: Wherever the equipment is suspended from the ceiling or the support structure the hanger vibration isolators are used. These pipe vibration isolators are very simple in design with a metallic rectangular plate bracket that is either stamped or welded. Adequate corrosion resistance is provided through powder coating. The pipe spring hangers further consist of a deflection spring element, a spring cap and an elastomer element. The hanger vibration isolators are designed in such a manner that they can take a support rod misalignment of almost 30 degrees thus making the installation very flexible. The spring deflections are also available from 25 mm to 100 mm with load capacities in the range of 15 to 1500 Kg. The typical applications are pipe supports and hangers, ducting support and hangers, in-line fans and cabinet fans etc.

HVAC hangers: For applications requiring the Heating Ventilation and Air Conditioning (HVAC) equipment to be suspended from the ceiling or structural members, HVAC hangers are used. The HVAC hangers are very similar to the hanger vibration isolators described above with the difference coming in the deflection and load capacities. In the HVAC equipment, the dynamic forces also come into play when we suspend the equipment containing the rotating parts. The entire ducting for the HVAC systems is suspended using the ducting support and hangers. The heavier parts like the air conditioning unit, AHU etc. can be directly mounted on the rooftop using the air conditioning anti-vibration mounts.

Generator vibration isolator: There are two types of vibrations that occur within a generator system. One is the torsional vibration generated due to the engine combustion forces while the other is the linear vibration which can be due to many reasons. To tackle these linear vibrations, the engine and the alternator of the generator set are isolated from the base frame by using elastomeric engine mount vibration isolators. A number of elastomeric bushings are used for mounting the other electronic equipment and enclosures on the frame. The generator vibration isolators reduce the transmission of vibrations to the other components as the mechanical energy is dissipated in the elastomeric element. The equipment vibration isolation pads interrupt the energy transmission path between the rotating equipment and its surrounding support structure. The load capacity of the elastomeric isolators is limited as compared to the spring isolators. However, they are well suited for dampening low weight equipment on the generator set. The strength of the elastomeric isolators lies in their shear loading resistance when loaded in the vertical direction. The elastomeric generator vibration isolators not only resist misalignment forces but also dampen the high-frequency vibrations effectively.

Rear spring shackles: Shackles are commonly used in everyday life and you can easily observe the rear spring shackles in almost all four wheel automobiles. The shackles hold the rear leaf springs in position and together with it provides the damping action in the rear suspension of the vehicle. A typical rear shackle with vibration isolation is a product with metal to rubber bonding. The metal part is powder quoted for corrosion resistance. The elastomer prevents the metal to metal contact and hence, acts as a vibration isolator. The rear spring shackle also comes in an extended version in case there is such a requirement.

Andre HVAC International Inc. is a solution provider when it comes to fulfilling the anti-vibration needs of the clients. The AHI product range is very large and suits the multiplicity of the anti-vibration requirements raised by the clients. Whether you want to mount your equipment on the floor or on the rooftop, a huge variety of anti-vibration mounts are available depending on the load and deflections. Similarly, there are a number of anti-vibration suspension products like the equipment isolation spring hangers that can protect the surrounding structures from the ill effects of vibrations generated from suspended equipment.

Spring hangers for your piping, HVAC, and ceiling requirements

Ceiling hangers can comprise of spring elements, rubber elements or a combination of both. The use of spring hangers is recommended for locations subjected to impact and very low frequency noise. The hanger springs can provide lower natural frequencies than the designs that have rubber elements alone. When the two are combined the resulting anti-vibration hanger provides acoustic isolation across a wide frequency range.

The spring ceiling hanger consists of a metal bracket, spring with metal cup, and an elastomer element. The anti-vibration hanger can be suspended from a threaded rod that is properly anchored or can be attached directly to a metal or concrete deck. Normally the hanger springs are rated for a one inch Spring hangers for your piping, HVAC, and ceiling requirementsdeflection. The neoprene elastomer element is resilient enough to support one or more layers of the gypsum board that goes into the false ceiling. The spacer bracket which is a part of the spring ceiling hanger holds the vibration hanger rigidly till the gypsum board weight compresses the spring into position.

The metallic spring brackets that house the spring coil and the elastomeric element and made from metal strip bent into a near rectangular shape. They are protected from corrosion by the process of galvanizing or powder coating. Since the spring ceiling hangers are hidden from view, adequate corrosion protection is provided.

The high rise buildings also house the HVAC equipment, piping and ducting. While the HVAC equipment is mounted on the top of the buildings, the piping and ducting crisscrosses the various floors in the building. The designers try to hide the ductwork and piping between the concrete and gypsum ceilings. The problem that can arise is the vibrations carried by these HVAC ducts which can get transmitted to the supporting structures. This can create serious noise problems in the work areas inside the building. The solution lies in the use of HVAC hangers which can isolate the suspended piping or duct from the supporting structure. The deflection of the spring element combined with the resilience of the elastomeric element provides an effective dampening of vibrations.

The pipelines used in the industry, commercial and residential buildings are sometimes used to transport fluids at high temperatures. Since most of these pipes are metallic, they are prone to thermal expansion. If the rigid supports are provided, the pipes tend to deform when they carry the hot fluid. This can cause damage to the installed pipes. To take care of the thermal expansion and return to shape when the fluid temperature becomes normal, the use of pipe spring hangers is recommended. The spring element in the piping spring hangers can get stretched out or get compressed under the thermal movement of the pipe. The hangers provide for free displacement of the pipe in the vertical direction.

Andre HVAC International Inc. has been in the field of anti-vibration hangers and mounts for a good thirteen years now. They not only have the expertise in the field of pipe, ceiling, and HVAC hangers but also have a wide variety of the spring hangers in their manufacturing range.


Anti-vibration hangers for noiseless ceilings and silent HVAC suspensions

The customers today are very specific in their demand of ‘no vibrations and noise emanating from the ceilings.’ They have a similar requirement for vibration and noise free HVAC installation. Andre HVAC International Inc. comes forth with a wide variety of anti-vibration hangers and spring brackets especially suited for these applications. The spring ceiling hangers provide for the acoustic isolation by combining the metal spring elements with the resilient elastomers.

Spring ceiling hangers: The product is available from the house of Andre HVAC International Inc. for both wood and concrete/metal ceilings. These spring ceiling hangers have a spring, elastomer, spring cap and metal plate housing. The springs are rated for a deflection of 1” while the neoprene elastomer element ensures that the concrete or wooden roof is isolated for vibrations and noise from the suspended ceiling. The housing of the hanger springs can be directly mounted to the concrete/metal or wooden roof. The suspension is also possible from a threaded rod that is suitably anchored to the roof. The spring ceiling hangers are flexible enough to allow for the leveling of the suspended false ceiling.

Piping spring hangers: The piping spring hangers and supports are preset at the manufacturing plant based on the installation load specification and blocked in both the directions. These settings are very precise and are carried out on digitally controlled test benches. Blocking of the pipe spring hangers assumes significance with regard to the pickling, flushing and hydrostatic tests which result in additional loads.

  • Factory set values are marked on the pipe spring hangers.
  • The installation position/ cold setting are indicated on the travel scale.
  • The hot position is defined by the maximum permissible load deviation as a reaction force to the expansion and is capped at 25% of the operating load
  • The blocking pieces can be removed and reinserted in any required position in the vibration hangers.
  • The fully galvanized surfaces provide the adequate protection from corrosion.

HVAC hangers: The anti-vibration hangers for HVAC applications can get rid of the structure-borne noise and vibration. These hanger springs are suitable for suspension of HVAC equipment like air conditioners, fans, ducts and piping. The large hole in the rectangular metal frame housing helps in assembly even if there is some angular misalignment. The elastomer grommet ensures that there is no metal to metal contact and perfect isolation from vibrations and noise is achieved. The HVAC hangers are available from Andre HVAC International Inc. in a wide range of load bearing capacity and spring deflection.

For certain applications where not much movement of the ceiling or equipment is permitted due to the civil structure design, you can go in for the pre-compressed spring hangers. Theanti-vibration hangers are adjusted for 70 percent of the anticipated load by the use of the pre-compressed spring. The movement in the ceiling or equipment does not begin till the deflection under load exceeds the 70 percent value. The Andre HVAC pipe and spring ceiling hangers are thus able to meet the majority of customer requirements.