substitution request - Alliance Construction Solutions

accessible location and anchor to adjacent pipe or wall. Provide access panels as
required for access.
18. Provide shutoff valves and unions or flanges to isolate each item of equipment,
branch circuit, or section of piping. Unions shall be provided at each threaded
valve (manual or automatic) and at all equipment having threaded connections.
19. Arrange piping and valves near each piece of equipment to allow for complete
service and maintenance of the equipment without disturbing the shutoff valves.
20. Provide dielectric unions or "Clearflow" fittings at all junctions of dissimilar metals
in fresh water systems.
21. Use full lengths of pipe; short lengths with couplings will not be permitted. All
pipe sections shall be de-burred to full I.D. before joining.
22. Extend chains for valve operators to 6'-3" above the floor or platform. Brace
extension handles and provide a means of indicating open and closed positions.
23. All piping installed below grade (unless factory pre-insulated) shall be spiral
wrapped with 10 mil PVC tape (Scotchwrap No. 50 or equal) with 50% overlap,
and laid in bed of sand with 3” minimum cover on all sides unless otherwise
noted. Compaction per Division 2.
B. Hydronic Piping:
Project No.: 10145
550 15th Street Dual Brand Hotel
03/16/2012
a. Fittings shall be double-wrapped with second layer extended a minimum
of 12” beyond fittings.
1. Make reductions in hydronic pipe sizes using eccentric reducer fitting installed with
the level side up.
2. Install hydronic piping branch connections to mains using tee fittings in main with
take-off out the bottom of the main, except for up-feed risers, which shall have
take-off out the top of the main line. Install all hydronic piping level with manual
air vent at all high points in direction of flow.
3. Install hydronic piping level except for gravity flow systems such as condenser
water and condensate drain piping.
C. Refrigerant Piping:
1. General: Install refrigerant piping in accordance with ASHRAE Standard 15, "The
Safety Code for Mechanical Refrigeration."
2. Make joints smooth and unconstricted inside and out, and ream pipe ends
thoroughly to remove all burrs.
3. Install piping in as short and direct arrangement as possible to minimize pressure
drop.
4. Install piping for minimum number of joints using as few elbows and other fittings
as possible.
5. Arrange piping to allow normal inspection and servicing of compressor and other
equipment. Install valves and specialties in accessible locations to allow for
servicing and inspection.
6. Provide adequate clearance between pipe and adjacent walls and hangers, and
between pipes, for insulation installation. Use sleeves through floors, walls, or
ceilings, sized to permit installation of full thickness insulation.
7. Insulate all refrigerant lines.
a. Do not install insulation until system testing has been completed and all
leaks have been eliminated.
8. Install branch tie-in lines to parallel compressors at equal length, and pipe
identically and symmetrically.
23 2113 - 11 HYDRONIC PIPING