
	Anti Vibration Mounts

OS

Open Spring Mountings - Standard Range Sizes OSB, OSS, OS25 and OS50

For Building Services Applications

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This unique range of Open Spring mountings uses integral rubber end fixing of the springs which sets them apart from all other designs. Loose springs and plates are now history and high frequency noise attenuation is provided regardless of whether a rubber seating pad is used or not.

Originally designed for use with Type IPF Inertia Pouring Frames, the OS mountings are now widely used to isolate vibration from every conceivable type of rotating and reciprocating machine. Where control of transient motion is required Open Spring mountings can be used in conjunction with our Viscous Dampers Type SFD.

Design Features:

Unique expanding rubber end fixing of springs (Patent applied for) which also provides high frequency attenuation.
Nominal 20, 25 and 50 mm deflection colour coded helical steel springs to BS1726 Class B with 50% overload capacity and O/D equal to at least 85% of working height.
Can be bolted to supporting structure or free standing on 6 mm thick ribbed rubber pad (3 mm on OSS).
Fully height adjustable (OS25 and OS50).
All steel components are zinc plated.
No snubbing gives maximum efficiency.

Typical Applications:

Axial and Centrifugal Fans.
Air Handling Units.
Low level pipework.
With Inertia bases type IPF for pumps, generating sets and compressors etc.

Application Notes:

Isolation Efficiency at Typical Machine Speeds:

MACHINE SPEEDS (rpm)	EFFICIENCY %
MACHINE SPEEDS (rpm)	15 mm DEFL.	25 mm DEFL.	50 mm DEFL.
300	DO NOT USE	34.0	75.2
500	68.7	83.3	92.3
750	88.1	93.2	96.7
1000	93.7	96.3	98.2
1200	95.7	97.4	98.7
1500	97.3	98.4	99.2
1750	98.0	98.8	99.4
2000	98.5	99.1	99.5

The above figures are theoretical values only based on the vertical natural frequency of the sprung system assuming infinitely stiff structural supports.

The effects of high frequency spring coil resonances on low frequency performance are also ignored.