substitution request - Alliance Construction Solutions

Flash tanks A 2" No
Single wall breeching
and stacks
3.05 INSTALLATION OF PIPING INSULATION:
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
D 4" No
A. General: Install insulation products in accordance with manufacturer's written instructions
and in accordance with recognized industry practices, to ensure that insulation serves its
intended purpose.
B. Install insulation on piping systems subsequent to installation of heat tracing, testing, and
acceptance of tests.
C. Install insulation materials with smooth and even surfaces. Insulate each continuous run of
piping with full-length units of insulation, with single cut piece to complete run. Do not use
cut pieces or scraps abutting each other.
D. Clean and dry pipe surfaces prior to insulating. Butt insulation joints firmly together to
ensure complete and tight fit over surfaces to be covered.
E. Where factory premolded, one-piece, PVC insulated fitting covers are to be used, the
proper factory precut insulation shall be applied to the fitting using two layers for pipe
temperatures above 250°F or below 35°F, and single-layer insulation for pipe
temperatures between 35°F and 250°F. The ends of the insulation shall be tucked snugly
into the throat of the fitting and the edges adjacent to the pipe covering, tufted and tucked
in, fully insulating the pipe fitting. Covers shall overlap the adjoining pipe insulation and
jackets, and on cold pipes shall be sealed at all seam edges with vapor barrier adhesive.
The circumferential edges of all covers shall be sealed with pressure sensitive tape. The
tape shall overlap the jacket and cover by at least 1”.
F. Maintain integrity of vapor barrier jackets on cold pipe insulation, and protect to prevent
puncture or other damage.
1. Do not use staples or tacks on vapor barrier jackets.
2. Seal vapor barrier penetrations with vapor barrier finish recommended by the
manufacturer.
3. Seal fitting covers with PVC tape.
4. Cover all unions, check valves, and other in-line devices. Mark outer covering
with indelible marker to identify item covered.
G. Neatly bevel insulation at all exposed edges, and seal with finishing cement.
H. At locations where PVC covers are prohibited, the Contractor shall insulate fittings, etc.,
using one coat of insulation cement, premolded fiberglass fitting covers and/or segments
of pipe insulation. Finish shall be ASJ jacket or glass fabric embedded in fire retardant
mastic. Raw ends shall be coated with vinyl acrylic mastic (CP-10/11) for hot piping or
shall be coated with vapor barrier mastic (CP-30 or Fosters 30-35) for cold piping.
23 0713 - 8 MECHANICAL INSULATION