Complete Compiled Specification.pdf - Peck Ormsby Construction

Fine crocus cloth or fitting brushes especially made for this type of work should be used. Surfaces shall be
burnished until all dirt and oxide is removed. Cleaned surface should not be touched with hands or gloves.
A light coat of brazing flux shall be applied to both pipe and fittings. Acid flux (such as muriatic or hydrochloric
acid) shall not be used. The resulting corrosion would seriously affect the pipe and composition for brazing.
Joint shall be heated to proper brazing temperature, being sure that it is uniformly hot so brazing material will
flow to all parts of the joint. The brazing material shall be fed to the joint until a uniform line of brazing material
appears around the pipe at the end of the fittings.
Refrigerant piping shall be joined with "sil-fos" soldered joints. "Easy-Flow" solder may be used for
connections at valves and specialties only.
An oxy-acetylene torch shall be used for heating the joint for brazing. During brazing, the pipe and fittings
must be kept full of an inert gas, N or CO2 to prevent formation of scale.
NOTE: Should the contractor be observed by the job superintendent or any authorized inspector soldering
or brazing any part of a refrigerant piping system without proper circulation of inert gas thru the lines being
worked on, it shall be assumed that the entire system was fabricated in such a manner, and all of the piping
installed on that system shall be condemned and promptly removed from the job site at the expense of the
contractor.
When solenoid stop valves are being installed, the coil shall be removed to prevent the heat of soldering
from ruining the insulation. When sight glasses are being installed, the glass should be removed to prevent
cracking. No heat shall be applied near the bulb of the expansion valve or any other place where an
excessive temperature may cause damage.
All of the foregoing piping shall be examined, and if found to leak, shall be made tight and test repeated until
the system is proved tight. All tests shall be verified by the Owner's representative.
After all refrigeration piping and connections are completed, make a leak test by filling the system with freon
and test for leaks with an electronic leak detector. Evacuate all piping to 500 microns and hold for 24 hours
prior to final charging.
Charge the system with clean, dry refrigerant until a proper operating charge has been added as determined
by proper operation with a clean refrigerant stream at the sight of glass.
Pipe covering shall not be installed, nor the piping anchored until testing is completed and all leaks have
been properly eliminated.
INSTALLATION OF THERMOMETERS AND THERMOMETER WELLS:
General: Install thermometers and thermometer wells at locations shown on the drawings and where
specified. Install thermometers so that they can be read by a person standing on the floor and with normal
illumination.
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SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDTION March 2, 2009
BASIC MATERIALS & METHODS 15050-30