Larger imageSeismic Snubber

Source: Noson, Perbix, SSD

Purpose

To secure emergency power systems.

The emergency power system can include the following elements:

• Motor generator set
• Battery set
• Fuel supply tank
• Muffler
• Electric cable
• Power transfer unit

Recommendation — Secure Generator

Install seismic snubbers to secure motor generator set.

Source: Noson, Perbix, SSD

Supplies Required

• Eight steel Z snubbers (or other type of seismic snubber)
• Eight expansion bolts—1/2" diameter (for concrete)
OR

• Eight expansion bolts—1/2" diameter (for wood)

Installation

1. Place snubbers at two sides near the corners.
2. Bolt to the concrete or wood, allowing 1" free play between the generator and snubber.

Note

• Due to size or complex design, motor generator sets and power transfer units may require more extensive mitigation design by a structural engineer.
• Equipment may already be anchored directly without using isolation springs. Consult with structural engineer to determine if seismic snubbers are necessary.

Larger imageFuel Supply Tank

Source: Noson, Perbix, SSD

Recommendation — Secure Fuel/Water Tank

Install steel braced platforms, metal straps, and slack line to secure fuel supply tank or water day tank.

Caution

When anchoring to post-tensioned slab, locate and avoid reinforcing.

Supplies Required

• Steel-braced platform (Consult an engineer for design.)
• Metal straps (18 gage x 2")
• Sheet metal screws—3/8"
• Flexible line
• Lag bolts or expansion bolts—3/8"

Installation

1. Place a minimum of two straps (one at each end of the tank).
2. Secure straps to the steel-braced platform with sheet metal screws. Attach to supporting structure with lag bolts or expansion bolts.

Note

• Provide slack in electrical cables.
• Anchor each element in the system.