Restrained springs

Seismic Restraints for Mechanical Equipment Restrained springs

**Figure 117:** *Typical installation of restrained spring installation.*

More than four restrained springs may be required. See the manufacturer’s instructions.

Step 1: Determine where to bolt the equipment

Accurately draw the bolt pattern on the floor or pad using one of the following methods:

Set the equipment in place and mark the holes.
Make a template.
Use measurements and shop drawings to lay out the bolt hole pattern.

Step 2: Install anchors

Drill and install post-installed anchors or pour concrete with embedded studs or headed cast-in-place anchors.

Step 3: Set restrained spring isolators and bolt to anchors

Install restrained springs to building structure as shown in Figure 118. Attach nuts to the anchor. Use bolts for shell-type anchors or internally threaded wedge or chemical anchors. Torque as recommended by the anchor manufacturer.

BE CAREFUL NOT TO DAMAGE THE ANCHORS WHEN SETTING THE EQUIPMENT OR ISOLATOR.

***Figure 118:*** *Attachment of restrained springs to building structure.*

Step 4: Move the equipment into place over the isolators

Use leveling nuts to level the equipment. Use attachment nuts to attach the base of the equipment to the isolator.

Figure 119 shows typical ways to connect the equipment to the restraints.

**Figure 119:** *Attachment of equipment to restrained springs.*

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