
	Anti Vibration Mounts

ES and ECS

Enclosed Spring and Enclosed Captive Spring Mountings - Sizes ESB, ES, ES25, ECS25 and ECS50

For Building Services Applications

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A unique range of mountings designed primarily for building services applications where the control of low frequency vibration and noise emanating from mechanical plant is of paramount importance.

The benefits of a combined rubber and steel housing for the spring have helped establish the ES and ECS mountings as industry standards accepted by specifiers, equipment manufacturers and mechanical services installers alike.

Design Features:

Nitrile rubber (oil resistant) lower spring housing eliminates the possibility of metallic continuity and ensures excellent acoustic performance. Steel reinforced on ECS range.
Full enclosed captive assembly protects the spring and controls transient motion.
All steel components are zinc plated.
Nominal 15, 20, 25 and 50 mm deflection colour coded helical steel springs to BS1726 Class B, laterally stable with 50% overload capacity.
Simple single screw height adjustment.
Spring viewing/inspection hole and 6 mm thick ribbed rubber seating pads available for ES25 and ECS ranges.
Colour coded labels for easy identification.
Stainless Steel and Zinc Sprayed variants available.

Typical Applications:

Axial and Centrifugal Fans.
Air Handling Units.
Chillers and Cooling Towers.
Rotary and Multi Cylinder Compressors.
Diesel Generating Sets (ECS only).
Mechanical Test Rigs.
Isolation of sensitive equipment.

Application Notes:

Visible Spring Option

The ES25 and ECS ranges are available with a viewing hole in the lower spring housing.
When ordering the Pt. No. should be suffixed with /VS e.g. ECS25/500/VS.
Seating Pads

Ribbed rubber seating pads can now be fitted as standard, suffix Pt. No. /B e.g. ES25/100/B.
Stainless Steel/Zinc Sprayed

This option is available on both ECS25 and ECS50 ranges for external and other hostile environments.

Please suffix Pt. No. /S or /SB if fitted with seating pad e.g. ECS25/500/S or ECS25/500/SB.

A Zinc Sprayed option is available on both ES20 and ES25 ranges.

Please suffix Pt. No. /ZS or /ZSB if fitted with seating pad e.g. ES15/100/ZS or ES25/30/ZSB.

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.