3.1.5
Supports
3.1.5.1
General
Hangers used to support piping 50 mm 2 inches and larger shall be
fabricated to permit adequate adjustment after erection while still
supporting the load. Pipe guides and anchors shall be installed to keep
pipes in accurate alignment, to direct the expansion movement, and to
prevent buckling, swaying, and undue strain. All 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 joist between
panel points shall not exceed 222 Newtons 50 pounds. Loads exceeding 222
Newtons 50 pounds shall be suspended from panel points.
3.1.5.2
Pipe Supports and Structural Bracing, Seismic Requirements
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NOTE: Provide seismic requirements, if a Government
designer (Corps office or A/E) is the Engineer of
Record, and show on the drawings. Delete the
bracketedphrase if seismic details are not
provided.Sections 13080 and 15070A, properly edited,
must be included in the contract documents.
**************************************************************************
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 [as
shown]. Structural steel required for reinforcement to properly support
piping, headers, and equipment but not shown shall be provided in this
section. Material used for supports shall be as specified in Section 05120
STRUCTURAL STEEL.
3.1.5.3
Pipe Hangers, Inserts, and Supports
Pipe hangers, inserts and supports shall conform to MSS SP-58 and MSS SP-69,
except as modified herein.
a.
Types 5, 12, and 26 shall not be used.
b.
Type 3 shall not be used on insulated pipe.
c.
Type 18 inserts shall be secured to concrete forms before concrete
is placed. Continuous inserts which allow more adjustment may be
used if they otherwise meet the requirements for type 18 inserts.
d.
Type 19 and 23 C-clamps shall be torqued per MSS SP-69 and have
both locknuts and retaining devices, furnished by the
manufacturer. The C-clamp body shall not be constructed from bent
plate.
e.
Type 20 attachments used on angles and channels shall be furnished
with an added malleable iron heel plate or adapter.
f.
Type 24 may be used only on trapeze hanger systems or on
fabricated frames.
SECTION 15562A
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