SPECIFICATION 15

SPECIFICATION 15 Pipe clevis cross bolt braces are required in all restraint locations. They shall be special pur- pose preformed channels deep enough to be held in place by bolts passing over the cross bolt. Clevis cross braces shall have an Anchorage Preapproval “OPA” Number from OSHPD in the State of California. Clevis cross brace…

SPECIFICATION 14

SPECIFICATION 14 Steel angles, sized to prevent buckling, shall be clamped to pipe or equipment rods utilizing a minimum of three ductile iron clamps at each restraint location when required. Welding of support rods is not acceptable. Rod clamp assemblies shall have an Anchorage Preapproval “OPA” Number from OSHPD in the State of California. Rod…

SPECIFICATION 13

SPECIFICATION 13 eismic solid braces shall consist of steel angles or channels to resist seismic loads with a minimum safety factor of 2 and arranged to provide all directional restraint. Seismic solid brace end connectors shall be steel assemblies that swivel to the final installation angle and utilize two through bolts to provide proper attachment.…

SPECIFICATION 12

SPECIFICATION 12 eismic Cable Restraints shall consist of galvanized steel aircraft cables sized to resist seismic loads with a minimum safety factor of two and arranged to provide all-directional restraint. Cables must be prestretched to achieve a certified minimum modulus of elasticity. Cable end connections shall be steel assemblies that swivel to final installation angle…

SPECIFICATION 11

SPECIFICATION 11 Hangers shall be as described in 10, but they shall be precompressed and locked at the rated deflection by means of a resilient seismic upstop to keep the piping or equipment at a fixed elevation during installation. The hangers shall be designed with a release mechanism to free the spring after the installation…

SPECIFICATION 10A

SPECIFICATION 10A angers shall be as described in 10, but they shall be supplied with a combination rubber and steel rebound washer as the seismic upstop for suspended piping, ductwork, equipment and electrical cabletrays. Rubber thickness shall be a minimum of 1/4” (6mm). Submittals shall include a drawing of the hanger showing the installation of…

SPECIFICATION 10

SPECIFICATION 10 angers shall consist of rigid steel frames containing minimum 11/4” (32mm) thick neoprene elements at the top and a steel spring with general characteristics as in specification 5 seated in a steel washer reinforced neoprene cup on the bottom. The neoprene element and the cup shall have neoprene bushings projecting through the steel…

SPECIFICATION 9

SPECIFICATION 9 Restrained air spring mountings shall have an MT air spring as described in Specification 8, within a rigid housing that includes vertical limit stops to prevent air spring extension when weight is removed. The housing shall serve as blocking during erection. A steel spacer shall be removed after adjustment. Installed and operating heights…

SPECIFICATION 8

SPECIFICATION 8 Air Springs shall be manufactured with upper and lower steel sections connected by a replaceable flexible nylon reinforced neoprene element. Air spring configuration shall be multiple bellows to achieve a maximum natural frequency of 3 Hz. Air Springs shall be designed for a burst pressure that is a minimum of three times the…

SPECIFICATION 7

SPECIFICATION 7 Spring mountings as in specification 5 built into a ductile iron or steel housing to provide all directional seismic snubbing. The snubber shall be adjustable vertically and allow a maximum of 1/4” (6mm) travel in all directions before contacting the resilient snubbing collars. Mountings shall have an Anchorage Preapproval “OPA” number from OSHPD…