2.7.4
Cast Iron Access Door
Cast iron frame, [hinged and] gasketed cast iron door, quick closing clamps
for watertight sealing[, size as indicated][, 152 by 229 mm 6 by 9 inches
minimum size].
2.8
SUPPORTS AND HANGERS
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NOTE: The designer shall design all supports,
including wind bracing for stacks, and show all
important details on the drawings. SMACNA Accepted
Industry Practice for Industrial Duct Construction
is illustrative and does not fix sizes of supports
or allowable loads. Refer to SMACNA round and
rectangular duct construction standards for design
tables and other information.
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2.8.1
General Requirements for Supporting Elements
Provide ducting systems and equipment supporting elements including but not
limited to building structure attachments; supplementary steel; hanger
rods, stanchions and fixtures; vertical duct attachments; horizontal duct
attachments; anchors; supports. Design supporting elements for stresses
imposed by systems, with a minimum safety factor of 4.0 based on duct being
50 percent full of particulate conveyed. Supporting elements shall conform
to SMACNA Industry Practice, SMACNA Rectangle Duct Const, SMACNA Rnd Duct
Const, [SMACNA TDCM,] and NFPA 91, as applicable, and modified and
supplementary requirements specified herein. Do not use weld studs and
powder actuated anchoring devices to support mechanical systems components
without prior approval.
2.8.2
Vertical Attachments
Provide in accordance with SMACNA Standards, except mill galvanized iron
straps shall be a minimum of 25 mm one inch wide, 16 gage thick.
2.8.3
Horizontal Attachments
Provide as indicated in accordance with SMACNA Standards.
2.8.4
Supplementary Steel
Provide where required to frame structural members between existing members
or where structural members are used in lieu of commercially rated
supports. Such supplementary steel shall be fabricated in accordance with
the AISC 335.
2.8.5
Vibration Isolators
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NOTE: See Section 15070, "Mechanical Sound,
Vibration, and Seismic Control," for guidance given
in guide specification technical notes. Definite
requirements should be specified in contract
specification for bidders' information.
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SECTION 15801N
Page 25
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