2.14.3 STEAM RECORDING FLOW METERS
Provide steam recording flow meters for steam turbines and steam
absorption machines to record the steam flow rate in pounds per hour
and total steam flow for at least a 24-hour period.
2.14.4 CONTROL ROOM
The control room shall be air-conditioned with noise level of not more
than 50 decibels.
2.15
SEISMIC REQUIREMENTS (HVAC)
2.15.1 GENERAL
2.15.1.1 Earthquake-resistive design shall comply with the requirements
of Construction Standards CD-54, Natural Disaster Resistive Design
(Non-Structural), latest edition of VA Handbook H-18-8, Seismic Design
Requirements, and the Uniform Building Code (UBC) published by
International Conference of Building Officials (ICBO).
2.15.1.2 Earthquake-resistive design for HVAC equipment shall be
provided where Seismic Zone Factor, "Z" value is 0.10 or greater, and
for piping and ductwork where "Z" value is 0.20 or greater. The "Z"
values for VA sites are listed in VA Handbook H-18-8. These values must
be verified with VA for a specific project before proceeding with the
design.
2.15.1.3 HVAC equipment, ductwork 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).
2.15.1.4 Unless otherwise shown by SMACNA or NUSIG, provide required
details and structural calculations to completely address seismic
bracing requirements. See paragraph 2.15.4 "CALCULATIONS".
2.15.1.5 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. Also, be careful in using SMACNA details
where "Z" value is more than 0.40, as these details may not apply.
2.15.1.6 Coordinate earthquake-resistive design with the project
Professional Structural Engineer for appropriateness and soundness.
2.15.1.7 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.
2.15.2 CONFORMANCE WITH SMACNA
2.15.2.1 Design professional should 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 SHL
HVAC DESIGN MANUAL
2-59
HVAC SYSTEMS AND EQUIPMENT
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