Vibration isolators for suspended equipment, with minimum static deflection
requirement exceeding 0.4" (10 mm), shall be hangers consisting of a free-standing,
laterally stabile steel spring and elastomeric washer in series, assembled
in a stamped or welded steel bracket.
The bracket shall be finished with an polyester powder coating. The manufacturer
shall provide independent laboratory testing showing that the bracket with
this finish has endured a minimum of 1,000 hours of exposure to salt spray
fog testing per ASTM B117 without signs of corrosion.
The hanger bracket shall be designed to carry a 500% overload without failure
and to allow a support rod misalignment through a 30° arc without metal-tometal
contact or other short circuit.
The 1" and 2" hanger brackets shall incorporate spring caps with indexed
steps which correspond to the washer diameter of appropriately sized hanger
rod to keep the rod centered in the spring cap and reduce rod misalignment.
The spring caps are protected under U.S. patent number 5,653,426.
Springs shall have a minimum lateral stiffness of 1.0 times the rated vertical
Springs shall be selected to provide operating static deflections shown
on the Vibration Isolation Schedule or as indicated on the project documents.
Springs shall be color coded or otherwise identified to indicate load capacity.
Vibration isolation hangers shall be Model SH, as manufactured by Kinetics
Noise Control, Inc.