A vibration isolator is a mechanical device placed between vibrating equipment — such as a pump, fan, chiller, or compressor — and the building structure, to prevent the transmission of mechanical vibration and structure-borne noise. Isolators act as a flexible, energy-absorbing break in the rigid connection between machinery and its support, allowing the equipment to vibrate freely while the building remains undisturbed. RMS Corporation has supplied vibration isolators across India and internationally for over 45 years.
In this article:
- Types of Vibration Isolators
- Key benefits of Vibration Isolators
- Range of Vibration Isolators
- FAQ
- Contact Us
Types of Vibration Isolators:
Spring Isolators: Spring isolators are ideal for heavy-duty applications where significant vibration isolation is required. These are made of high-strength steel and can handle large loads while providing excellent flexibility. Commonly used in HVAC systems, industrial machinery, and generators, spring isolators offer long-term durability and effectiveness.
Rubber Isolators: Rubber isolators are perfect for lightweight applications where noise reduction and cost-effectiveness are key. These isolators are made of high-grade elastomers, offering excellent shock absorption. They are commonly used in small machinery, automotive applications, fan coil units, air handling units, small pumps, rooftop HVAC equipment, and MEP piping supports in commercial and residential buildings.
Hanger Mounts: Hanger mounts are spring or rubber isolators designed for overhead suspension of ceiling-hung equipment — fan coil units, ductwork, pipework, and suspended air handling units. They isolate vibration and noise from travelling upward into the slab above, which would otherwise radiate into occupied spaces on the floor above. Essential for all MEP installations where services are ceiling-suspended rather than floor-mounted.
Spring-Viscous Dampers: Spring-viscous dampers combine a steel coil spring with a fluid viscous damper element. The spring provides the isolation, while the damper controls resonance during equipment start-up and shutdown — the period when machinery passes through its natural frequency and vibration amplitudes can temporarily spike. Used in critical applications such as large hospital plant rooms, data centres, and seismically rated installations.
Seismic Restraint Isolators: Seismic restraint isolators are specialised mounting systems designed to perform two functions simultaneously — providing vibration isolation during normal equipment operation, and physically restraining equipment from shifting, toppling, or becoming a hazard during a seismic event. Unlike standard vibration isolators which allow controlled movement, seismic restraint isolators incorporate built-in snubbers or limit stops that engage only when movement exceeds a safe threshold during an earthquake, locking the equipment within defined limits while the isolation element continues to function
Rubber pads: also called anti-vibration pads or neoprene pads — are the simplest and most economical form of vibration isolator. Available in ribbed or waffle patterns, they are placed directly under equipment base plates and provide modest isolation for lighter machinery, small transformers, and general industrial equipment where a full mount assembly is not required.
Key Benefits of Vibration Isolators:
Noise Reduction By absorbing and dampening vibration at the source, isolators significantly reduce the structure-borne noise that travels through floors, walls, and ceilings. In commercial buildings and hospitals, properly selected vibration isolators can reduce transmitted noise levels by 10–25 dB — the difference between a clearly audible hum and a barely perceptible background level. This is especially critical in sensitive environments such as operating theatres, hotel guest rooms, and open-plan offices where mechanical noise directly affects occupant comfort and productivity.
Enhanced Machinery Lifespan Continuous vibration causes micro-fatigue in metal components — loosening fasteners, wearing bearings prematurely, cracking welds, and degrading seals over time. By isolating the vibration path, isolators dramatically reduce the cyclic stress on both the equipment itself and the supporting structure. Equipment installed on correctly specified vibration mounts typically experiences 30–40% less mechanical wear compared to rigidly mounted equipment, translating directly into fewer breakdowns, reduced maintenance intervals, and a longer overall service life.
Improved Operational Safety Excessive vibration in mechanical plant rooms can cause equipment to shift on its base, loosen pipe connections, and in severe cases, contribute to structural fatigue in slabs and frames. Vibration isolators keep machinery stable within its designed footprint, reducing the risk of unplanned movement, loosened connections, or cascading failures. For equipment in elevated plant rooms or rooftop installations, this stability is not just a comfort issue — it is a structural safety requirement.
Structural Protection Buildings are not designed to absorb continuous cyclic loading from mechanical equipment. Vibration transmitted from pumps, chillers, and generators into concrete slabs and steel frames causes micro-cracking and fatigue over time, particularly at column-beam junctions and slab penetration points. Vibration isolators break this transmission path entirely, protecting the building fabric and helping the structure perform as designed throughout its intended service life.
Compliance with Building and Acoustic Standards Many project specifications — particularly for hospitals, hotels, data centres, and green-rated buildings — specify maximum permissible vibration transmission levels in line with standards such as NBC (National Building Code of India), ISO 10137 (Serviceability of Buildings Against Vibrations), and ASHRAE acoustic guidelines. Properly selected and installed vibration isolators are often the primary means of achieving compliance with these requirements. RMS Corporation’s engineering team assists project consultants and MEP contractors in selecting products that meet specified isolation performance targets.
Energy Efficiency When machinery vibrates excessively and transmits that vibration into its surroundings, energy is wasted as structural noise rather than doing useful work. Vibration isolators allow equipment to operate closer to its design efficiency point by reducing parasitic energy losses. In large HVAC installations with multiple chillers and pumps running continuously, this can contribute meaningfully to the building’s overall energy performance.
Explore our range of Vibration Isolators:
By Products:
- Spring Isolators :High deflection, low frequency isolation
- Rubber Isolators :Compact, cost-effective solutions
- Hanger Mounts : For suspended piping and equipment
- Seismic Products :With earthquake protection
- Spring Isolators with Viscous Dampers: For Extreme Vibration Control
By Application:
- HVAC Systems: Chillers, AHUs, cooling towers, pumps, fans
- Power Generation: Generators, DG sets, turbines, transformers
- Industrial: Compressors, machinery, presses, process equipment
- Building Services: Elevators, escalators, MEP systems
Get Expert Advice
RMS Corporation has over 40 years of experience in vibration isolation.
Our engineering team can help you: Delete
✓ Select the right isolator type for your equipment Deleted:
✓ Calculate proper deflection and load capacity Deleted:
✓ Design complete vibration isolation systems
Contact our technical team:eleted:
Phone: +91 9323804063| +91 9167245533 Email: [email protected]
We are authorised channel partners for Industry Leaders of Vibration Isolators Polybond India Pvt. Ltd (Rubber to Metal Bonded) and Resistoflex (Rubber to Metal Bonded, Spring Isolators, Seismic Isolators)
Frequently Asked Questions
A vibration isolator is a mechanical device placed between vibrating equipment — such as a pump, fan, chiller, or compressor — and the building structure, to prevent the transmission of mechanical vibration and structure-borne noise. Isolators act as a flexible, energy-absorbing break in the rigid connection between machinery and its support, allowing the equipment to vibrate freely while the building remains undisturbed.
Vibration isolators are used wherever rotating or reciprocating machinery is mounted in or on a building. The most common applications include HVAC plant rooms (chillers, air handling units, cooling towers, pumps), power generation facilities (DG sets, generators, turbines), MEP installations in commercial and residential buildings, hospitals, hotels, metro rail stations, and industrial manufacturing plants.
The selection depends on four key parameters: the equipment's operating weight at each mount point, its running speed in RPM (which determines the disturbing frequency in Hz), the required static deflection for the target isolation efficiency, and the installation environment (indoor/outdoor, chemical exposure, seismic zone). RMS Corporation provides technical selection support — share your equipment data sheet and operating conditions, and our engineering team will recommend the correct product and mounting arrangement.
Vibration isolation efficiency is expressed as a percentage and indicates how much of the generated vibration force is prevented from reaching the building structure. A correctly selected isolator should achieve a minimum of 90% isolation efficiency is typically specified. Efficiency depends on the ratio between the isolator's natural frequency and the equipment's operating frequency — the greater this ratio, the higher the isolation achieved.
A hanger mount is a vibration isolator designed for overhead suspension — used to isolate ceiling-hung equipment such as fan coil units, ductwork, pipework, and suspended air handling units from the slab above. They are available in rubber and spring types and are essential in MEP installations where equipment is suspended rather than floor-mounted. Without hanger mounts, vibration from suspended services travels directly into the slab and radiates as noise into occupied spaces below.
Rubber vibration isolators should be inspected periodically — typically every 2–3 years — for signs of hardening, cracking, or oil contamination, which can degrade their elastomeric properties. Spring isolators are generally more durable and require only visual inspection for corrosion, especially in outdoor or humid environments
Standard vibration isolators are designed for normal operating conditions and do not provide seismic restraint. For earthquake protection, seismic-rated products — including seismic spring isolators with built-in snubbers, seismic restrained hangers, and bracing systems — are required. These are specifically designed to allow normal vibration isolation during operation while limiting equipment movement during a seismic event. RMS Corporation supplies seismic-rated vibration isolation products for hospitals, data centres, and critical infrastructure projects.
