accordance with ASME B31.1; maximum spacing for supports for copper tubing
shall be in accordance with PHCC-1983 National Standard Plumbing Code.
3.1.3.4
Copper Tubing
Copper tubing shall have solder joints with solder suitable for the
pressure-temperature ratings of the piping system. Tubing 20 mm 3/4 inch
and smaller for instrument air may be compression joint in lieu of soldered
joint. Tin-antimony (95/5) solder is suitable for saturated steam up to
103 kPa (gage) 15 psig but tin lead (50/50) solder is not acceptable for
steam service. Flux shall be non corrosive. Wipe excess solder from the
joints.
3.1.3.5
Sleeves
Provide pipe sleeves where pipes and tubing pass through masonry and
concrete walls, floors, and partitions. Space between pipe, tubing, or
insulation and the sleeve shall be not less than 6 mm 1/4 inch. Hold
sleeves securely in proper position and location before and during
construction. Sleeves shall be of sufficient length to pass through entire
thickness of walls, partitions, and slabs. Sleeves in floor slabs shall
extend 13 mm 1/2 inch above the finished floor. Firmly pack space between
pipe or tubing and the sleeve with oakum and caulk on both ends of the
sleeve with elastic cement.
3.1.3.6
Flashing for Buildings
Where pipes pass through building roofs and outside walls, provide proper
flashing and counter flashing and make tight and waterproof.
3.1.3.7
Outlets for Future Connections
Locate as directed capped or plugged outlets for connections to future
equipment, when not located exactly by the project drawings.
3.1.3.8
Screwed Joints in Piping
Provide teflon tape or suitable pipe joint compound applied to male threads
only for making up screwed joints. Piping shall be free from fins and
burrs. Ream or file out pipe ends to size of bore, and remove chips.
3.1.3.9
Welded Joints
Weld joints in piping by the metal-arc or gas welding processes in
accordance with ASME B31.1 and as specified in Section 15216N WELDING
PRESSURE PIPING.
Number or mark each weld to identify the work done by
each welder on welds on which stress relieving or radiographic inspection
is required.
a.
Contracting Officer reserves the right to require the Contractor
to provide re-examination and re-certification of welders.
b.
Radiographic testing of circumferential butt welded joints of pipe
with operating temperature of 177 degrees C 350 degrees F and
above shall be required on ten percent of the joints, the location
of which will be determined by the Contracting Officer; when more
than ten percent of the radiographically tested joints show
unacceptable defects radiographically test joints of this type
piping.
SECTION 15502N
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