June 99
c.
Sound an audible alarm.
4.
SEISMIC REQUIREMENTS (HVAC):
4.1
GENERAL:
A.
Earthquake-resistive design shall comply with the
requirements of the Uniform Building Code (UBC)
published by International Conference of Building
Official (ICBO).
B.
Brace HVAC equipment, certain ductwork, and piping
in accordance with the most current edition of Seismic
Restraint Manual Guidelines for Mechanical Systems
(SMACNA) and National Uniform Seismic Installation
Guidelines (NUSIG).
C. Unless otherwise shown by SMACNA or NUSIG,
provide required details and structural calculations to
completely address seismic bracing requirements.
See paragraph "CALCULATIONS".
D. SMACNA does not cover all conditions such as,
providing bracing details for seismic restraints of
equipment or details of flexible joints, or bracing of in-
line equipment, etc.
E.
Coordinate earthquake-resistive design with the
project Professional Structural Engineer for
appropriateness and soundness.
F.
Both SMACNA and NUSIG list conditions under which
seismic bracing may be omitted. However, a design
professional may revoke these omissions on an
individual project basis.
4.2
CONFORMANCE WITH SMACNA:
A.
Requires a design professional to develop a Seismic
Hazard Level (SHL) for a specific project for use of its
manual. The SHL is derived from a combination of
factors, such as applicable building codes, seismic
zones, and importance factors into a single system for
determining appropriate bracing or restraints. A
building with an SHL of "A" requires the strongest
restraints whereas a building with an SHL of "C"
requires the least restraints. The design professional
VA Design Guide -- National Cemetery Administration
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