3.1.2
Pipe Sleeves and Plates
Provide sleeves where piping passes through walls, floors, roofs, and
partitions. Secure sleeves in proper position and location during
construction. Provide sleeves of sufficient length to pass through entire
thickness of walls, floors, roofs, and partitions. Extend sleeves in floor
slabs 80 mm 3 inches above the finished floor. Provide not less than 6 mm
1/4 inch space between exterior of piping or pipe insulation and interior
of sleeve. Firmly pack space with insulation and calk at both ends of the
sleeve with plastic waterproof cement which will dry to a firm but pliable
mass, or provide a segmented elastomeric seal. Secure plates to pipes at
sleeves.
3.1.3
Steel Piping
Steel piping 50 mm 2 inches and smaller shall be threaded or socket-welded.
Steel piping 65 mm 2 1/2 inches and larger shall be buttwelded. Flanges
may be used for valves and equipment installation. Piping joints shall
conform to ASME B31.3. Direct buried piping connections shall be welded.
3.1.4
Threaded Joints in Piping
Provide lubricant or polytetrafluoroethylene tape conforming to MIL-T-27730
on male threads of screwed joints. Red or white lead and zinc compound
conforming to MIL-T-22361 may be used. Lubricate threaded pipe joints, as
well as bolts and studs used on high temperature pipe joints up to 566
degrees C 1050 degrees F, with anti-seize compound in accordance with
MIL-PRF-907. Piping shall be free from fins and burrs. Ream or file out
pipe ends to size of bore and remove chips. Attach screwed flanges by
screwing the pipe through the flange, and reface pipe and flange accurately.
3.1.5
Copper Tubing
Cut with square ends and remove burrs and fins. Replace tubing cut,
dented, or otherwise damaged with new tubing. Clean outside surface of
tubing ends and inside recess of fittings to bright metal with wire brush
or abrasive, then apply flux to outside surface of tubing ends and on the
recess inside of fittings. Insert tubing to the full depth of fitting,
then braze. Remove stems and washers of solder-joint type valves before
brazing. Brazing procedure qualification and preparation and procedures
for joints shall be in accordance with ASME B31.3.
3.1.5.1
Copper Tube Extracted Joint
Extracted mechanical tee joint may be made in copper tube. Make joint 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, provide dimpled depth stops.
Notch the branch tube for proper penetration into fitting to assure a free
flow joint. Braze extracted joints using a copper phosphorous
classification brazing filler metal. Soldered joints are not permitted.
Joints shall meet all system design and test requirements specified herein,
be approved by the manufacturer for the specific service and be installed
in strict accordance with the manufacturers written procedures and
instructions.
SECTION 15192N
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