9.4
Where reduced pressure backflow preventers are required (Master
Specification 15400), provide positive drainage.
Design in accordance with NFPA 54.
10.
INTERIOR FUEL GAS SYSTEM:
CENTRAL VACUUM CLEANING SYSTEM: Provide a central vacuum cleaning
11.
system, including simplex vacuum pump, piping and inlets. Locate wall
inlets on clean and dirty laundry rooms adjacent to each unit of laundry
equipment.
12.
SEISMIC REQUIREMENTS:
12.1
GENERAL:
A.
Earthquake-resistive design shall comply with the requirements
of Design and Construction Procedures, "Natural Disasters Non-
Structural Resistive Design"; the latest edition of "Seismic
Design Requirements"; and the Uniform Building Code (UBC)
published by International Conference of Building Officials
(ICBO).
B.
Earthquake-resistive design for equipment shall be provided
where peak horizontal ground acceleration, "Z" is 0.10g or
greater and for piping where "Z" is 0.20g or greater. The "Z"
values for VA sites are listed in "Seismic Design
Requirements". These values must be verified with VA for a
specific project before proceeding with the design.
C.
Plumbing equipment and piping shall be braced in accordance
with the most current edition of Seismic Restraint Manual
Guidelines for Mechanical Systems (SMACNA) and National
Uniform Seismic Installation Guidelines (NUSIG).
D.
Unless otherwise shown by SMACNA or NUSIG, provide required
details and structural calculations to completely address
seismic bracing requirements. See paragraph 12.4
"CALCULATIONS".
E.
SMACNA does not cover all conditions such as, providing
bracing details for seismic restraints of equipment or details
of flexible joints when crossing seismic or expansion joints,
or bracing of in-line equipment, etc.
F.
Coordinate earthquake-resistive design with the project
Professional Structural Engineer for appropriateness and
soundness.
G.
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.
12.2
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
bracings or restraints. A building with an SHL of "A"
requires the strongest restraints, whereas, a building with
SHL of "C" requires the least restraints. The design
professional is responsible for specifying the SHL of "C"
4
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