Description :

Easyflex Model EFRSI Seismic Control Restrained Spring Vibration Isolators consist of free-standing, large diameter, laterally stable steel springs assembled into welded steel housing assemblies fabricated to limit vertical movement of the isolated equipment if equipment loads are reduced or if the equipment is subjected to large external forces such as a seismic events. The housings also provide a constant free and operating height to facilitate installation. Spring elements are complete with internal noise isolation pads and have an adjusting and leveling bolt as a part of the top load plate assembly. Holes are provided in all isolators for bolting to the structure and to the supported equipment. To assure stability, the springs have a lateral spring stiffness than 1.2 times the rated vertical stiffness and are designed to provide a minimum of 50% overload capacity. EFRSI isolators are available with deflections upto 2" (50 mm) and with load capacities to 5,000 kg. As standard products. Custom isolators with higher deflection and greater load capabilities are also available. Easyflex Model EFRSI Spring Isolators are recommended for the isolation of vibration produced by equipment carrying a large fluid load which may be drained, such as boilers and chillers, and specially for the isolation fo cooling towers, air-cooled condensers, etc. where motion due to wind loads must be minimized.

Application :

Easyflex Model EFRSI Seismic Control Restrained Spring Isolators are recommended as a noise and vibration isolator for mechanical equipment located near critically quiet areas when the equipment to be isolated has significant changes of weight during maintenance operations and for equipment subjected to seismic events, external forces, or high wind loads.

Model EFRSI Isolators are typically used to reduce the transmission of noise and vibration into supporting structure form equipment carrying a large fluid load that may be drained, such as boilers and chillers, and cooling towers which also require hold-down for seismic and wind loads. Operating static deflections are available to 2" (50mm) to and maintain a high degree of noise and vibration isolation.

Specifications :

Vibration isolators shall be seismically rated, restrained spring isolators for equipment which is subject to load variations and large external forces. Isolators shall consist of large diameter, laterally stable, steel springs assembled into welded steel housing assemblies designed to limit movement of the supported equipment in all directions.

Housing assembly shall be of fabricated steel members and shall consist of a top load plate complete with adjusting and leveling bolts, adjustable vertical restraints, isolation, isolation washers, and a bottom plate with internal non-skid noise isolation pads and holes for anchoring of housing to supporting structure. Housing shall be hot-dip galvanized or powder coated for corrosion resistance. Housing shall be designed to provide a constant free and operating free and operating height within 1/8" (3mm).

The isolator housing shall provide a minimum of 1g restraint in all directions.

Spring elements shall be selected to provide static deflections as shown on the vibration isolation schedule or as indicated or required in the project documents. Springs shall be color coded or otherwise identified.

Spring elements shall have a lateral stiffness grater than 1.2 times the rated vertical stiffness and shall be designed to provide a minimum of 50% overload capacity. Non-welded spring elements shall be powder coated, and shall have a 1000 hr rating when tested in accordance with ASTM B-117.

Vibration isolators shall be Model EFRSI as manufactured by Kanwal Industrial Corporation.