
	Anti Vibration Mounts

ORS

Open Restrained Spring Mountings
Type ORS25 and ORS50

For Building Services Applications

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The ORS mounting has been designed specifically for applications where transmission of low frequency machinery vibration to a building structure must be reduced to avoid physical damage or annoyance to the occupants.

It is a low frequency mounting specifically designed to limit vertical movement on equipment such as cooling towers and chillers. This could otherwise be excessive due to the low stiffness springs required to provide isolation of low frequency vibration.

Applications located at roof level can be successfully mounted on ORS units as any movement caused by high wind loads will be limited. Equipment which contains large volumes of liquid will benefit from installation on ORS mountings because during “draining down” upward movement is restricted thus avoiding damage to pipework and electrical connections.

Design Features:

High strength all steel construction fully zinc plated after fabrication.
Colour coded helical steel springs to BS1726 Class B with nominal deflections of 25 mm and 50 mm and up to 50% overload capacity also O/D equal to at least 80% of working height.
Vertical and lateral restraints have rubber inserts to avoid metallic contact and adequate radial clearance ensures isolation efficiency is not impaired.
Spring located using rubber sleeved pegs and seated on a rubber washer to reduce high frequency transmission.
Working height and vertical limiting stops are fully adjustable.
6 mm thick ribbed rubber seating pad supplied as standard.

Typical Applications:

Cooling Towers.
Chillers.
Large Fans.
Air Handling Units.

Application Notes:

Isolation Efficiency at Typical Machine Speeds:

MACHINE SPEEDS (rpm)	EFFICIENCY %
MACHINE SPEEDS (rpm)	25 mm DEFL.	50 mm DEFL.
300	34.0	75.2
500	83.3	92.3
750	93.2	96.7
1000	96.3	98.2
1200	97.4	98.7
1500	98.4	99.2

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.