specifications for ceiling suspensions will contain
notes indicating that hanger loads between panel
points in excess of 22.7 kgs (50 lbs) steel joist
shall have the excess hanger loads suspended from
panel points.
Provide seismic details, if a Government designer
(either Corps office or A/E) is the Engineer of
Record, and show on the drawings. Delete the
bracketed phrase in item a. if no seismic details
are provided. Sections 13080 and 15070A, properly
edited, will be included in the contract documents.
Support for steam piping from boiler nozzle to steam
header and steam lines 150 mm (6 inches) and larger
will be detailed on the drawings as excessive stress
to thermal expansion. Each spring hanger location
will be clearly indicated. They will be assigned a
number in a schedule on the drawings that lists
hanger details, load, and movement.
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Hangers used to support piping 50 mm 2 inches and larger shall be
fabricated to permit adequate adjustment after erection while supporting
the load. Pipe guides and anchors shall be installed to prevent buckling,
swaying, and undue strain. Piping subjected to vertical movement when
operating temperatures exceed ambient temperatures shall be supported by
variable spring hangers and supports or by constant support hangers. Pipe
hanger loads suspended from steel joists between panel points shall not
exceed 23 kg 50 pounds. Loads exceeding 23 kg 50 pounds shall be suspended
from panel points.
a.
Piping and attached valves shall be supported and braced to resist
seismic loads as specified in Sections 13080 SEISMIC PROTECTION
FOR MISCELLANEOUS EQUIPMENT and 15070A SEISMIC PROTECTION FOR
MECHANICAL EQUIPMENT. Structural steel required for reinforcement
to properly support piping, headers, and equipment but not shown
shall be provided under this section. Material used for supports
shall be as specified under Section 05120 STRUCTURAL STEEL.
b.
Structural Attachments: Structural steel brackets required to
support piping, headers, and equipment, but not shown, shall be
provided under this section. Material and installation shall be
as specified under Section 05120 STRUCTURAL STEEL.
3.1.3.2
Pipe Hangers, Inserts, and Supports
Pipe hangers, inserts and supports shall conform to MSS SP-58 and MSS SP-69,
except as otherwise specified.
a.
Types 5, 12, and 26 shall not be used.
b.
Type 3 shall not be used on insulated pipe which has a vapor
barrier. Type 3 may be used on insulated pipe that does not have
a vapor barrier if clamped directly to the pipe and if the clamp
bottom does not extend through the insulation and the top clamp
attachment does not contact the insulation during pipe movement.
SECTION 15561A
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