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.