RW30

RW30 – 1” DEF. Swing Spring Hangers Hangers shall be as described in 10, but they shall be supplied with a combination rubber and steel rebound washer as the seismic up stop for suspended piping, ductwork, equipment and electrical cable trays. Rubber thickness shall be a minimum of 1/4” (6mm). Submittals shall include a drawing…

PC30S

PC30S – 1” DEF. Swing Spring Hangers Hangers shall consist of rigid steel frame containing a minimum 11/4”(32mm) thick LDS rubber element at the top and a steel spring with general characteristics as in specification B seated in a steel washer reinforced LDS rubber cup on the bottom. The LDS rubber element and the cup…

PC30

PC30 – 1” DEF. Swing Spring Hangers Hangers shall consist of rigid steel frame containing a minimum 11/4”(32mm) thick LDS rubber element at the top and a steel spring with general characteristics as in specification B seated in a steel washer reinforced LDS rubber cup on the bottom. The LDS rubber element and the cup…

30

30 – 1” DEF. Swing Spring Hangers Hangers shall consist of rigid steel frame containing a minimum 11/4”(32mm) thick LDS rubber element at the top and a steel spring with general characteristics as in specification B seated in a steel washer reinforced LDS rubber cup on the bottom. The LDS rubber element and the cup…

Seismic Bracing

SEISMIC BRACING Seismic 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 pre-stretched to achieve a certified minimum modulus of elasticity. Cable end connections shall be steel assemblies that swivel to final installation…

Pipe Guides & Anchors

PIPE GUIDES & ANCHORS All-directional acoustical pipe anchors consist of two sizes of steel tubing separated by a minimum 1/2” (13mm) thickness of 60 Duro or softer neoprene. Vertical restraint shall be provided by similar material arranged to prevent up or down vertical travel. Allowable loads on the isolation material shall not exceed 500 psi…

Pipe Expansion Hangers

PIPE EXPANSION HANGERS HES Hangers are installed at riser suspension points to control load shifts as the riser expands or contracts. If a 120 foot(37m) steel riser goes through a temperature increase of 150°F(66°C), the piping will expand 1.4″(36mm). If the piping had an anchor point in the basement, the piping bracket at the 60’(18m)…

Thrust Restraints

THRUST RESTRAINTS The horizontal thrust restraint shall consist of a spring element in series with a neoprene molded cup as described in specification 5 with the same deflection as specified for the mountings or hangers. The spring element shall be designed so it can be preset for thrust at the factory and adjusted in the…

Bushings

BUSHINGS Up until the 1950’s most rubber mountings were designed to take the load in shear. Mountings were circular or sold in long strips, so the capacity could be controlled by size and durometer, or durometer and the cut off length. Shear loading curves are straight line similar to steel springs. The deflection can be used directly in the frequency equation after dynamic stiffness correction. Unfortunately, shear…