seismic restraints. For facilities designated as
critical, hazardous, or essential, delete or make
exceptions for piping and ducts which will require
seismic restraint.
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Seismic restraints are not required for the following items:
a.
Gas piping less than 25 mm 1inch inside diameter.
b.
Piping in boiler and mechanical equipment rooms less than 32 mm
1-1/4 inches inside diameter.
c.
All other piping less than 64 mm 2-1/2inches inside diameter.
d.
Rectangular air handling ducts less than 0.56 square meters 6
square feet in cross sectional area.
e.
Round air handling ducts less than 711 mm 28 inches in diameter.
f.
Piping suspended by individual hangers 300 mm 12 inches or less in
length from the top of pipe to the bottom of the supporting
structural member where the hanger is attached, except as noted
below.
g.
Ducts suspended by hangers 300 mm 12inches or less in length from
the top of the duct to the bottom of the supporting structural
member, except as noted below.
In exemptions f. and g. all hangers shall meet the length requirements. If
the length requirement is exceeded by one hanger in the run, the entire run
shall be braced. Interior piping and ducts not listed above shall be
seismically protected in accordance with the provisions of this
specification.
1.3
EQUIPMENT REQUIREMENTS
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NOTE: Seismic Control does not guarantee that the
equipment itself is rugged enough to survive
earthquake shaking. When a piece of equipment is
required to remain operational after an earthquake,
the manufacturer should be consulted regarding the
capabilities of the equipment to withstand seismic
loading.
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1.3.1
Rigidly Mounted Equipment
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NOTE: Rigidly mounted equipment is defined as
having a period of vibration of 0.06 seconds or less
for the equipment plus its mounting. Equipment with
a fundamental period greater than 0.06 seconds
should be assumed to be flexibly mounted or nonrigid
and designed in accordance with the next paragraph
below.
List items that may require additional
SECTION 15070A
Page 7
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