substitution request - Alliance Construction Solutions

2. Slope condensate lines minimum 1/4 inch per foot.
D. 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.
3. Before and after piping fabrication, all flanges, threaded connections, and
beveled pipe ends shall be protected with end protectors and suitable grease to
prevent corrosion and damage until installed into the system.
4. Before welding, the end of the pipe and fittings shall be cleaned of rust, scale, dirt,
grease, protective coating, or other foreign matter which might affect the quality of
the welds.
5. When pipes of different wall thicknesses are to be welded together, the end of the
thicker pipe shall be smoothly tapered to the wall thickness of the thinner pipe.
The taper angle shall not be more than 30° from the axis of the pipe.
6. Before welding, the piping shall be aligned as required in ASME Code for Pressure
Piping B-31.
7. Pipe, flanges, and fittings damaged during fabrication or shipment shall be
replaced. Any damaged sections shall be removed from the job site.
8. The necessity of preheating of welds and the temperature used are requirements
of the welding procedure. If the metal temperature is below 32°F, local
preheating to a temperature warm to the hand is required for materials which
otherwise do not require preheating.
9. The preparation of butt-welded ends of pipe, welding neck flanges, pipe fittings,
and any other piping component, including valves which are butt-welded into the
Project No.: 10145
550 15 th Street Dual Brand Hotel
12/23/2011
22 1116 - 12 BASIC PLUMBING PIPING