Inertia Bases


Inertia Bases
inertia base and mount packages are used beneath mechanical equipment to improve stability and to minimise the vibratory movement and noise transmission due to equipment start-up, operation and run-down. They are designed and manufactured to meet with individual requirements and are suitable for mechanical equipment such as pumps, air handling units, chillers, booster sets, compressors, etc. They are supplied to site ready for filling with concrete. We recommend that a concrete mix ratio of 4 parts gravel : 2 parts sand : 1 part cement is used to give a concrete density of 2,400 to 2,500 kg/m3. We request that our engineers are contacted for assistance with this type of equipment. Inertia bases are designed to reduce noise and vibration transmission between plant equipment and the building structure.  They are usually supported on helical steel spring mounts and are used to:- Provide stability to a system.  Lower the centre of mass. Reduce coupled mode problems. Minimise the effect of external forces. Ensure an even load distribution. Add rigidity to the plant / equipment. Reduce the effect of centre of mass estimates. Provide suitable anti-vibration mount fixings. Reduce vibratory movement due to plant start-up and run-down as the resonant frequency is passed.

 

An inertia base is normally required when vibrating plant is required to be isolated with high deflection mounts, typically above 10mm deflection. If plant, such as a pump, is placed on springs without a frame base, it will be unstable. An inertia base is a frame base into which concrete is poured, which increases the mass of the base, consequently damping down the inertial forces of the plant. The increased mass of the concrete in the base also lowers the centre of gravity of the combined structure, decreasing the base dimensions required to achieve stability. The height of the frame of the base must be at least of the longest dimension between supporting mounts.


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