final bid specs 09328.pdf - Freese and Nichols, Inc.

3.00 EXECUTION
pattern is not obvious, mark each pipe at branch; At other points of origination and
termination; Spaced at maximum intervals of 50 feet along each run; Reduce
intervals to 25 feet in areas of congested piping and equipment.
3.01 PREPARATION
A. Establish invert elevations for drainage piping within 5’-0” of building. Minimum slopes for
drainage pipe is 1/4" per foot for 2 1/2-inch diameter and less and 1/8 inch per foot for 3"
diameter pipe and greater.
3.02 INSTALLATION:
A. PIPE, VALVES AND FITTINGS
1. Provide non-conducting dielectric connections wherever jointing dissimilar metals.
2. Provide clearance for installation of insulation, and access to valves and fittings.
3. Provide access doors where valves and equipment are not accessible. Coordinate size
and location of access doors with applicable Section.
4. Install sanitary piping true to line with proper grading. Connect horizontal branches to
one another with 45 degrees "Y" fittings, combination "Y" and 1/8 bend fittings. Connect
horizontal lines to vertical stacks using 45 degrees "Y" branches, 60 degree "Y"
branches, or combination "Y" and 1/8 bend fittings. Horizontal branches turning down to
vertical stacks may use a short sweep or 1/2 bend. Branches connecting to mains or to
other branches shall enter the branch line at a 45 degree angle, tilted 45 degrees
upward, so that the entry is from the side and top.
5. Trap primer piping shall slope to floor drain at no less than 1/16-inch per foot. Horizontal
trap primer piping shall run below concrete floor slab. Horizontal Piping within concrete
slab is not permitted.
6. Materials exposed within ducts or plenums (ceiling spaces used as supply or return air
plenums) shall have a flame-spread index of not more than 25 and a smoke-developed
rating of not more than 50 when tested in accordance with the test for Surface Burning
Characteristics of Materials, UBC Standard. Wrap or enclose with rated materials, any
CPVC, PVC or PEX piping installed in rated spaces, including return air plenums.
7. Piping hangers shall be sized large enough to allow insulation to pass through. Hangers
for piping 2-1/2" and greater shall be provided with pipe covering protection saddle, or
high compressive strength insulation saddle. Hangers for piping 2" and less shall be
provided with pipe covering shields. On cold water piping provide vapor barrier through
hanger.
8. Anchor piping with regard to the transmission of vibration and noise. Securely anchor
copper piping to studs or wood blocking with "C" clamp of proper size for piping. At each
fixture location where the piping penetrates the partition, back the elbow inside the
partition, or chase, with wood blocking. Anchor with "C" clamps or cast brass drop ear
elbows to prevent movement. Do not use wire as an anchoring device.
9. Piping shall not come into direct contact with metal studs, beams, or other construction
elements. Provide a non-metallic separation between dissimilar metals when copper
piping is installed in direct contact with steel.
10. Install unions in piping 2” and smaller and flanges in piping 2 ½” and larger, adjacent to
each valve and at final connection to each piece of equipment having threaded pipe
connection.
11. Install piping adjacent to equipment and specialties to allow service and maintenance.
12. Install piping free of sags and bends.
B. PLUMBING SPECIALTIES AND EQUIPMENT
1. Pipe relief valves and drains to nearest floor drain. Minimum slope 1/16” per foot.
Provide 1" air gap.
Plumbing Systems 15400-15
DPR09328