23 07 19 - Mechanical Insulation
23 07 19 - Mechanical Insulation
23 07 19 - Mechanical Insulation
MECHANICAL INSULATION
Part 1 General
1.1 DESCRIPTION
A. Field applied insulation for thermal efficiency and condensation control for:
1. HVAC piping, ductwork and equipment.
B. Definitions:
A. ASTM C534, k = 0.033 Watt per meter, per degree C (0.27), flame spread not over
25, smoke developed not over 50, for temperatures from minus 4 degrees C (40
degrees F) to 93 degrees C (200 degrees F). No jacket required except those
required under item 2.1 B above. Class “O”.
B. Pipe insulation: Nominal thickness in millimeters (inches) are specified in table below
for piping above ground:
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MECHANICAL SPECIFICATIONS
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Nominal Pipe Size 25 (1) & 32-65 75-250 350 & Up
millimeters (inches) below) (1¼-2½) (3”-10”) (14” & up)
(Tube) (Tube) (Sheet) (Sheet)
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Part 3 Executions
A. Required pressure tests of duct and piping joints and connections shall be completed
and the work approved by the Resident Engineer for application of insulation. Surface
shall be clean and dry with all foreign materials, such as dirt, oil, loose scale and rust
removed.
B. Except for specific exceptions, insulate entire specified equipment, piping (pipe,
fittings, valves, accessories), and duct systems. Insulate each pipe and duct
individually. Do not use scrap pieces of insulation where a full length section will fit.
C. Where removal of insulation of piping, ductwork and equipment is required to comply
with Asbestos Abatement, such areas shall be reinsulated to comply with this
specification.
D. Insulation materials shall be installed in a first class manner with smooth and even
surfaces, with jackets and facings drawn tight and smoothly cemented down at all
laps. Insulation shall be continuous through all sleeves and openings, except at fire
dampers and duct heaters (NFPA 90A). Vapor retarders shall be continuous and
uninterrupted throughout systems with operating temperature 16 degrees C (60
degrees F) and below. Lap and seal vapor barrier over ends and exposed edges of
insulation. Anchors, supports and other metal projections through insulation on cold
surfaces shall be insulated and vapor sealed for a minimum length of 150 mm (6
inches).
E. Install vapor stops at all insulation terminations on either side of valves, pumps
and equipment and particularly in straight lengths of pipe insulation.
F. HVAC work not to be insulated:
1. Internally insulated ductwork and air handling units. Omit insulation on relief air
ducts.
2. Exhaust air ducts and plenums, and ventilation exhaust air shafts, unless
otherwise specified.
G. Apply insulation materials subject to the manufacturer's recommended temperature
limits. Apply adhesives, mastic and coatings at the manufacturer's recommended
minimum coverage.
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MECHANICAL SPECIFICATIONS
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c. Where possible, slip insulation over the pipe or tubing prior to connection,
and seal the butt joints with adhesive. Where the slip-on technique is not
possible, slit the insulation and apply it to the pipe sealing the seam and
joints with contact adhesive. Optional tape sealing, as recommended by
the manufacturer, may be employed. Make changes from mineral fiber
insulation in a straight run of pipe, not at a fitting. Seal joint with tape.
3. Apply sheet insulation to flat or large curved surfaces with 100 percent
adhesive coverage. For fittings and large pipe, apply adhesive to seams only.
1. Wrap pipe or duct with fire stop pipe insulation, seal jacket seam and seal and
joints to adjacent sections of insulation.
2. Seal opening between insulation and pipe sleeve with fire stopping material.
3. Among pipe and duct penetrations requiring fire stop insulation are the
following:
d. Smoke partitions.
e. Fire partitions.
2. Plenums, casing, fans, rectangular or square ducts and equipment’s: apply two
coats of weatherproof coating, Mil. Spec. MIL-C-19565, each trowelled or
sprayed in place to a wet thickness of 6 mm (1/4 inch), reinforced with open
weave glass fabric. After the second layer of mastic has dried, coat and seal
with a layer of asphalt aluminum sealer brushed in place.
3. Flexible elastomeric cellular and polyethylene insulation: Finish with two coats
of weather resistant finish as recommended by the insulation manufacturer.
END OF SECTION
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MECHANICAL SPECIFICATIONS
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