California OSHPD Pre-approval No. OPA-0197

California OSHPD Pre-approval No. OPA-0196

A major cause of equipment restraint failure is the breaking up of housekeeping pads. Virtually all housekeeping pads are poured independently after completion of the structure. In many cases there is no mechanical attachment to the structural floor and the pad itselfmay not be reinforced........

Anchorage of equipment in seismic zones is an important partof system restraint. When anchoring to concrete there are a variety of methods available. One excellent method is an Adhesive Anchor. It can be used in all non-overhead applications. Another excellent device is the wedge type expansion anchor. It provides the highest design load for the smallest hole size. Since it is load assisted, it provides excellent resistance to vibration and shock loads. Its slip potential is actually a positive feature in seismic applications, giving early warning of potential failure whereas other anchors just fail catastrophically.

Fans Heads are cabinets containing a fan and motor and no accessories such as coils or filters. They can develop extremely high thrusts that are equal to the suction area multiplied by the negative head plus the positive pressure multiplied by the discharge area. These forces act horizontally, opposite to the airflow and about halfway up the cabinet. Since fan heads are light and narrow they tend to shift and overturn with damage to the flexible connections or to the units themselves. Thrust restraints are recommended for all fan heads and for axial or centrifugal fans when the air thrust exceeds 10% ofthe equipment weight.

Hole Clearance Filler for Seismic and Blast Applications