3.1.1.7
Welding
Comply with AWS B2.1.
3.1.1.8
Cleaning of All Piping
During brazing, soldering, or welding operations, continuously purge with
oil-free dry nitrogen. As each section is completed, blow lines clear of
dirt and contamination with oil-free dry nitrogen in accordance with NFPA 99.
Cap or plug open ends, when left unattended
3.1.1.9
PVC Solvent-Cemented Joints (Oral Evacuation Systems Only)
Install in accordance with ASTM D 2855 and additional written
recommendations of the PVC pipe manufacturer.
3.1.1.10
Pitch
Pitch piping in the direction of flow.
Do not trap [except where
indicated].
3.1.1.11
Changes in Size
Effect changes in size with reducing fittings.
Do not use bushings.
3.1.1.12
Pipe Sleeves
Provide where pipes and tubing pass through walls, floors, roofs, and
partitions. Leave 6 mm 1/4 inch clearance around pipes. Secure sleeves in
proper position and location before and during construction. Ensure
sleeves of sufficient length to pass through entire thickness of walls,
partitions, or slabs. Cut sleeves flush at both ends except that sleeves
in floor slabs shall extend 50 mm 2 inches above the finished floor.
Firmly pack space between pipe or tubing and sleeve with mineral wool
insulation. [In lieu of pipe sleeves, core drilling of masonry and
concrete may be provided when cavities in the core-drilled holes are
completely grouted smooth.] Seal space at both ends of sleeve or
core-drilled hole with plastic waterproof cement which will dry to a firm
but pliable mass. In lieu of plastic cement seal, a mechanically
adjustable segmented elastomeric seal may be used.
3.1.1.13
Identification of Piping
Identify piping in accordance with ANSI A13.1, except provide tape and
decals conforming with FS A-A-1689 in lieu of stencils and paint. Provide
copies of the piping identification code and piping layout schematic framed
under glass [and install where indicated].
3.1.1.14
Excavation and Backfilling
Comply with Section 02300 EARTHWORK. Coordinate provision of utility
warning and identification tape with backfill operation. Bury lines at a
depth of minimum 305 mm one foot below finish grade.
3.1.2
Valves
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NOTE: Controlling, pressure reducing, flow control
SECTION 15217N
Page 27
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