substitution request - Alliance Construction Solutions

9. Install copper tubing in rigid or flexible conduit in locations where copper tubing
may be exposed to possible mechanical injury.
10. Slope refrigerant piping as follows:
Project No.: 10145
550 15th Street Dual Brand Hotel
03/16/2012
a. Install horizontal hot gas discharge piping with 1/2 inch per 10 feet
downward slope away from the compressor.
b. Install horizontal suction lines with 1/2 inch per 10 feet downward slope
to the compressor, with no long traps or dead ends which may cause oil
to separate from the suction gas and return to the compressor in
damaging slugs.
c. Install traps and double risers where indicated, and where required to
entrain oil in vertical runs.
d. Liquid lines may be installed level.
D. Condensate Drain Piping:
1. Condensate drain piping from air conditioning unit coil condensate drain pans
shall be of the sizes shown on the drawings.
2. Slope condensate lines minimum 1/8 inch per foot.
E. Natural Gas Piping:
1. Provide 6” drip leg for piping trapped by change of grade and at final connection
to equipment.
3.03 PIPING SYSTEM JOINTS:
A. General: Provide joints of type indicated for each piping system.
B. Thread pipe in accordance with ANSI B2.1; cut threads full and clean using sharp dies.
Ream threaded ends to remove burrs and restore full inside diameter. Apply pipe joint
compound, or pipe joint tape (Teflon) where recommended by pipe/fitting manufacturer,
on male threads at each joint, and tighten joint to leave not more than three threads
exposed.
C. Braze copper tube-and-fitting joints in accordance with ASME B-31.
D. Solder copper tube-and-fitting joints with silver solder or 95-5 tin-antimony solder. Cut
tube ends squarely, ream to full inside diameter, and clean outside of tube ends and
inside of fittings. Apply solder flux to joint areas of both tubes and fittings. Insert tube full
depth into fitting, and solder in a manner which will draw solder to full depth and
circumference of joint. Wipe excess solder from joint before it hardens.
E. Welding:
1. All welding on piping, including tack welding, shall be performed by welders currently
qualified and certified for the applicable welding process. A file shall be
maintained, for examination upon request, of all qualified welding procedures
and the names of the qualified welders performing this work.
2. Examine the inside of each length of piping to ensure it is free from dirt and
obstructions. If obstructed in any way, the pipe shall be swabbed out before being
incorporated into the system.
23 2113 - 12 HYDRONIC PIPING