Complete Compiled Specification.pdf - Peck Ormsby Construction

Downfeed Hot Water Supply: Each downfeed main for a hot water supply system shall be graded upward to
the first branch connection, which shall be taken from the top of the main. Beyond the first connection the
main shall grade downward, and all branch connections shall be taken from the bottom of the main.
Connect a 1/2-inch circulating line to the bottom of each downfeed riser. Provide branch circuiting lines with
gate valves in locations corresponding to the supply branch valve locations.
Grading: Hot water supply and hot water circulating lines shall be accurately and uniformly graded to avoid
traps which might impede or destroy circulation. All lines shall be graded so as to facilitate drainage.
Unions: Unions shall be installed near points of connection to each piece of equipment, and elsewhere as
required for installation of piping, removal and replacement of regulating and control equipment and the like.
Right and left couplings or nipples are prohibited.
Water Hammer Arresters: Water hammer arresters shall be provided where indicated on the drawings.
Water hammer arresters shall be approved and installed in accordance with the requirements of
PDI-WH201 and shall bear the PDI seal of approval.
Roughing: Roughing shall be provided for equipment furnished under other sections of the specifications.
Where future extensions are indicated on the drawings, roughing shall extend to within the space to be
served, and shall be valved, and capped or plugged.
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SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009
PLUMBING 15400-11