occur when making connections. Installation shall be made in accordance
with the manufacturer's recommendations. Mitering of joints for elbows and
notching of straight runs of pipe for tees will not be permitted. Joints
for flared fittings shall be of the compression pattern. Swing joints or
offsets shall be provided on branch connections, mains, and risers to
provide for expansion and contraction forces without undue stress to the
fittings or to short lengths of pipe or tubing. Pipe adapters shall be
provided where necessary for joining threaded pipe to copper tubing.
Brazed joints shall be made in conformance with MSS SP-73, and CDA A4015.
Copper-to-copper joints shall include the use of copper-phosphorous or
copper-phosphorous-silver brazing metal without flux. Brazing of
dissimilar metals (copper to bronze or brass) shall include the use of flux
with either a copper-phosphorous, copper-phosphorous-silver, or a silver
brazing filler metal. Soldered joints shall be made with flux and are only
acceptable for lines 50 mm 2 inches or smaller. Soldered joints shall
conform to ASME B31.5 and shall be in accordance with CDA A4015.
3.2.13
Copper Tube Extracted Joint
An extracted mechanical tee joint may be made in copper tube. Joint shall
be produced with an appropriate tool by drilling a pilot hole and drawing
out the tube surface to form a collar having a minimum height of three
times the thickness of the tube wall. To prevent the branch tube from
being inserted beyond the depth of the extracted joint, dimpled depth stops
shall be provided. The branch tube shall be notched for proper penetration
into fitting to assure a free flow joint. Extracted joints shall be brazed
using a copper phosphorous classification brazing filler metal. Soldered
joints will not be permitted.
3.2.14
Supports
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. 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. Threaded rods which are used for support shall not be formed or
bent. Supports shall not be attached to the underside of concrete filled
floors or concrete roof decks unless approved by the Contracting Officer.
3.2.14.1
Seismic Requirements for Supports and Structural Bracing
**************************************************************************
NOTE: Provide seismic requirements, if a Government
designer (either Corps Office of A/E) is the
Engineer of Record, and show on the drawings.
Delete the bracketed phrase if no seismic
requirements are provided. Sections13080 and 15070,
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
on the drawings]. Structural steel required for reinforcement to properly
support piping, headers, and equipment, but not shown, shall be provided in
SECTION 15569A
Page 66
Previous Page
