Tanks (such as expansion tanks) often do not have allocated mounting "feet" for extreme event applications. Vibro-Acoustics' seismic mounting brackets should be utilized at three to four locations around the base. Depending on the tank location and size, wall straps or custom tank cages may be required.

PDFApplication Details
PDFMaster VIRS Pre-Submittal Package

SRB - Seismic Equipment Restraint Brackets are a series of standardized steel brackets formed to match most equipment base support frames and pre-drilled to facilitate securing floor-mounted equipment against seismic forces.

The brackets are designed for a wide range of seismic forces and include rubber grommet washers as appropriate to minimize shock forces at anchor locations – helping to ensure that the tank not only stays in place during and after an extreme event but also remains operational.

The neoprene grommets also help minimize vibration transmission through the brackets which are commonly used in conjunction with Neo+ neoprene pad isolators.

Design Considerations

Seismic Requirements

Problem: Forces are determined by a number of factors including: project location, site class, risk category, component importance factor and equipment location equipment relative to the overall height of the building.

Solution: Certified anchorage calculations must be submitted to verify loading conditions are met for each piece of equipment.

Problem: Horizontal and vertical seismic forces are applied at the center of gravity of the unit. The resulting overturning moment creates tension and shear forces that can be very large.

Solution: All connections from the unit to the structure the must be designed for these loads. For concrete attachments, this requires ICC-ES certified anchors.

Problem: Reinforcement and doweling in of the housekeeping pad to the structure is often overlooked.

Solution: The load path must be accounted for from the center of gravity of the unit to the structure.

Problem: Poor installation of concrete anchors.

Solution: IBC 2015 requires ICC-ES approved anchors for cracked concrete and Omega Naught Factor (Horizontal forces multiplied by 2.5).

Problem: Differential motion up to 2” in a 20’ story height.

Solution: Flexible connectors are required to reduce equipment nozzle loads.

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