substitution request - Alliance Construction Solutions

Project No.: 10145
550 15 th Street Dual Brand Hotel
12/23/2011
piping system, shall be in accordance with ANSI B16.25 with the following
exceptions:
a. No permanent backing rings shall be used.
b. Use of consumable inserts is permitted and encouraged as a means of
obtaining required weld quality.
10. Spacers may be used in fitting up pipe and weld fittings for tack welding to a
proper gap for full penetration welds. Small tack welds which penetrate to the
bottom of the welding groove shall be used. Tack welds lacking full penetration
are not acceptable and shall be removed.
11. All pipe welds that allow visual inspection on the inside and that can be reached
by hand shall be inspected by the welder immediately after welding, and the
following actions shall be taken:
a. Weld spatter, flux, and debris shall be removed.
b. Excessive penetration shall be removed by grinding.
c. Areas without penetration or fusion shall be ground to sound metal and
repair welded.
12. Cleaning of excessive flux shall be performed between welding passes using wire
brushing or grinding.
13. Flanges welded to pipe spools shall be oriented with the bolt-holes straddling the
centerlines established on the piping drawings. Take precautions throughout
fabrication not to mar the gasket face on flanges.
F. Domestic water Piping: Provide dielectric unions at all junctions of dissimilar metals.
G. Flanged Joints: Match flanges within piping system, and at connections with valves and
equipment. Clean flange faces and install gaskets. Tighten bolts to provide uniform
compression of gaskets.
H. Hubless Cast-Iron Joints: Comply with coupling manufacturer's installation instructions.
3.04 EXPOSED PIPING IN FINISHED AREAS:
A. Plumbing piping and fittings which are exposed (and uninsulated) in finished areas
generally occupied by people, shall be installed with a smooth, high polish, durable
chrome-plated finish.
3.05 GROOVED PIPING SYSTEMS:
A. All changes in direction shall be made with radius type elbows.
1. Use long radius (R=1.5D) fittings wherever possible.
2. Angles less than 22-1/2° may be made with pre-manufactured mitered fittings.
3. Use of the angular deflection capabilities of grooved pipe couplings for intentional
changes of direction shall not be allowed.
B. All changes in pipe size shall be made with reducing fittings, not bushings or reducing
couplings.
22 1116 - 13 BASIC PLUMBING PIPING