Spring isolators shall be seismic control restrained spring isolators, incorporating a single vibration isolator, having all the characteristics of Model FDS open spring isolators as previously specified. Springs shall be restrained using a housing engineered to limit both lateral and vertical movement of the supported equipment during an earthquake without degrading the vibration isolation of the spring during normal equipment operating conditions.
Vibration isolators shall incorporate a steel housing and snubbing grommet system designed to limit motion to approximately 0.2" in any direction and to prevent any direct metal-to-metal contact between the supported member and the fixed housing. The restraining system shall be designed to withstand a force equivalent to 1.0 g in any lateral or vertical direction without yield or failure. Where the capacity of the anchorage hardware in concrete is inadequate for the required seismic loadings, an adapter plate to allow the addition of more or larger anchors will be fitted to fulfill these requirements. In addition to the primary isolation spring, the load path will include a minimum 0.25" thick neoprene pad.
To facilitate servicing, the isolator will be designed in such a way that it can be removed without the requirement to lift or otherwise disturb the supported equipment.
Spring isolators shall be Model FHS as manufactured by Kinetics Noise Control.
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