July 2006
H-18-8
4.0 Elements of Structures, Nonstructural Components, and
Equipment
Supported by Structures for Critical and Essential Facilities
In areas of Moderate-High, High and Very High Seismicities, elements of
structures and their attachments, permanent nonstructural components and their
attachments, and the attachments of permanent equipment supported by a
structure shall be designed to resist total design forces prescribed in ASCE 7,
Chapter 23 as modified by this document.
Exceptions: Seismic restraint may be omitted for the following installations:
a. Gas and medical piping less than one inch inside diameter;
b. Piping in boiler and mechanical equipment rooms less than 1 inch inside
diameter;
c. All other piping less than 2 inch inside diameter except for automatic fire
suppression systems;
d. All piping suspended by individual hangers, 12 inches or less in length from the
top of pipe to the bottom of the support for the hanger;
e. All electrical conduits, less than 2 inch inside diameter;
f. All rectangular air handling ducts less than six square feet in cross sectional
area;
g. All round air handling ducts less than 28 inches in diameter;
h. All ducts suspended by hangers 12 inches or less in length from the top of the
duct to the bottom of the support for the hanger;
i.
Equipment weighing less than 400 lbs, supported and attached directly on the
floor; and
j.
Equipment weighing less than 20 lbs suspended from the roof or floor or hung
from the wall.
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