SECTION 15270

EQUIPMENT AND PIPING INSULATION

PART 1 -- GENERAL

1.1 WORK INCLUDED

A. This Section specifies the requirements to furnish and install insulation on piping,
vessels, and equipment that is not preinsulated.

B. The following areas are covered:

1. Hot surface insulation.
2. Cold surface insulation.

1.2 RELATED WORK

A. Use this Section in conjunction with the following other specifications and related
Contract Documents to establish the requirements for insulation of equipment,
vessels, and piping:
1. Section 09920 - Painting - Equipment and Piping.
2. Section 15050 - Basic Mechanical Requirements.
3. Section 15140 - Piping Supports and Anchors.
4. [Section 15270A.tbl - Equipment Insulation Schedule.]
5. [Section 15270B.tbl - Piping Insulation Schedule.]

B. CAUTION: Use of this Section without including the above-listed items results in
omission of basic requirements.

C. In the event of conflict regarding equipment and piping insulation requirements

between this Section and another section, the provisions of this Section govern.

1.3 DEFINITIONS

A. Hot Surfaces: surfaces with operating temperatures above ambient temperature.

B. Cold Surfaces: surfaces with operating temperatures below ambient temperature or

dual-temperature surfaces which operate above and below ambient.

C. Fitting: designates elbows (ells), tees, caps, reducers, miters, and stub-in
connections.

D. Thermal Conductivity (k): units are Btu-inch per hour-square-foot- degrees F.

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 E. Water Vapor Permeability: measured in units of perm-inches is an indication of the
ability of a material to allow the passage of water vapor through it. The lower the
permeability, the higher is the resistance of the material to water vapor intrusion.

F. Thermal Expansion/Contraction: insulation system that operates continuously at

below ambient conditions or systems that cycle above or below ambient conditions.
Causing expansion/contraction of the piping/vessel/equipment and its
insulation/covering.

1.4
1.4 REGULATORY REQUIREMENTS

A. Flame Spread/Smoke Developed Ratings: composite ratings of 25 flame

spread/50 smoke developed per ASTM E84, Standard Test Method for Surface
Burning Characteristics of Building Materials, UL 723 Underwriters Laboratory,
Standard for Safety Test for Surface Burning Characteristics of Building Materials,
and NFPA 255 National Fire Protection Association, Standard Method of Test of
Surface Burning Characteristics of Building Materials.

B. Energy Codes: Comply with [American Society of Heating, Refrigeration and Air-
Conditioning Engineers, ASHRAE 90.1, Energy Conservation and New Building
Design], [Council of American Building Officials (CABO) Model Energy Code],
[International Building Code, IBC Chapter 13 Energy Efficiency], where insulation
requirements are more restrictive than indicated in this Specification.

C. Occupational Safety and Health Administration (OSHA): Comply with OSHA

requirements for materials, accessories, and personnel protection.

1.5 QUALIFICATIONS

A. Contractor: company specializing in commercial/industrial insulation installation

with 3 years' minimum experience.

1.6 SUBMITTALS

A. Provide the following with the Bid:

1. Insulation Schedule: complete list of materials and thickness for each pipe,
vessel, and equipment requiring insulation.
2. Product Data: for materials proposed.

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PART 2 -- PRODUCTS

2.1 INSULATION

A. Fiberglass (FG):
1. Type FG1 - Preformed Pipe Insulation, Jacketed:
a. Description: sectional complying with ASTM C547, Standard
Specification for Mineral Fiber Pipe Insulation.
b. Thermal Conductivity: 0.23 at 75 degree F mean temperature.
c. Jacket: factory-applied kraft-reinforced foil vapor barrier, all service
jacket (ASJ) with self-sealing lap seal. Maximum ASJ surface
temperature 150 degrees F.
d. Density: 10 pcf
e. Maximum Insulation Operating Temperature: 850 degrees F.
f. Acceptable Manufacturers:
1) Johns Manville-Micro-Lok AP-T Plus.
2) Knauf Glass GmbH – 1,000 degrees SSL Pipe Insulation.
3) Owens Corning Fiberglass Pipe Insulation.
2. Type FG2 - Semirigid, Jacketed:
a. Description: roll or board form complying with ASTM C612, Standard
Specification for Mineral Fiber Block and Board Thermal Insulation.
b. Thermal Conductivity: 0.27 at 75 degree F mean temperature.
c. Jacket: factory-applied kraft-reinforced foil vapor barrier, ASJ with self-
sealing lap seal. Maximum ASJ surface temperature 150 degrees F.
d. Density: 2.8 to 3 pcf.
e. Maximum Operating Temperature: 850 degrees F.
f. Acceptable Manufacturers:
1) Johns Manville – Fabrication Board Type 3005.
2) Knauf Fiber Glass GmbH – Pipe and Tank Insulation ASJ.
3. Type FG3 - Semirigid, Jacketed, Low Temperature:
a. Description: roll form complying with ASTM C612.
b. Thermal Conductivity: 0.24 at 75 degree F mean temperature.
c. Jacket: factory-applied foil-reinforced scrim kraft, vapor barrier jacket
(FSK) with self-sealing lap seal. Maximum FSK surface temperature
150 degrees F.
d. Density: 6 pcf.
e. Maximum Insulation Operating Temperature: 450 degrees F.
f. Acceptable Manufacturers:
1) Johns Manville – Spin Glas 817 FSK.
2) Knauf Fiber Glass GmbH – Insulation Board.
3) Owens Corning Type 705 Insulation.

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 4. Type FG4 - Flexible Blanket, Nonjacketed, High Temperature:
a. Description: roll form complying with ASTM C553, Specification for
Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial
Applications.
b. Thermal Conductivity: 0.27 at 75 degree F mean temperature.
c. Nonjacketed,
d. Density: 2 pcf.
e. Maximum Operating Temperature: 1,000 degrees F.
f. Acceptable Manufacturers:
1) Johns Manville HTB 23.
2) Owens Corning – Fiber Glass TIW Type 1.

B. Thermal Insulating Wool, Type W, Flexible Blanket, Wire Mesh:

1. Description: roll form with stainless steel hexagonal wire netting,
ASTM C553.
2. Thermal Conductivity: 0.25 at 75 degree F mean temperature.
3. Wire mesh.
4. Density: 8 pcf.
5. Maximum Operating Temperature: 1,200 degrees F.
6. Acceptable Manufacturer: CSR Bradford Fibermesh 650.

C. Cellular Glass - Type G - Rigid Preformed Pipe and Block:

1. Description: flat block or half-round incremental lengths of cellular glass
complying with ASTM C552, Standard Specification for Cellular Glass
Thermal Insulation, Type II, presized for nominal pipe sizes.
2. Thermal Conductivity: 0.345 at 75 degree F mean temperature.
3. Water Vapor Permeability: maximum 0.005 perm-inch.
4. Density: 6.7 to 9.2 pcf.
5. Maximum Operating Temperature: 800 degrees F.
6. Acceptable Manufacturer:
a. Pittsburgh Corning Foamglas.
b. Cell-U-Foam Ultra CUF.

D. Flexible Elastomeric Type E, Preformed Pipe and Sheet/Roll:

1. Description: Comply with ASTM C534, Standard Specification for Preformed
Flexible Elastomeric Cellular Thermal Insulation in Sheet and Tubular Form,
Types I and II.
2. Thermal Conductivity: 0.30 at 75 degree F mean temperature.
3. Water Vapor Permeability: 0.2 perm-inch.
a. Flame Spread/Smoke Developed Rating: 25/50 applicable to 3/4 inch
thickness or less.
b. Maximum Operating Temperature: 220 degrees F.

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 c. Acceptable Manufacturers:
1) Armacell: Armaflex SS (Self-Seal).
2) Rubatex: Insul-LockII/Sheet 1800.

E. Hydrous Calcium Silicate, Type CS, Preformed Pipe or Block:

1. Description: rigid, white, asbestosfree complying with ASTM C533, Standard
Specification for Calcium Silicate Block and Pipe Thermal Insulation, Type 1.
2. Thermal Conductivity: 0.4 at 300 degree F mean temperature.
3. Density: 14 to 15 pcf.
4. Maximum Operating Temperature: 1,200 degrees F.
5. Acceptable Manufacturers:
a. Calsilite.
b. Johns Manville Thermo-12 Gold.

F. Open Cell Melamine - Foam, Type M, Flexible Open-Cell Melamine, Jacketed:

1. Description: prejacketed, preformed pipe or sheet insulation; fiberfree; low
outgassing, antibacterial, flexible open-call melamine foam complying with
ASTM C-1410, Standard Specification for Cellular Melamine Thermal and
Sound Absorbing Insulation.
2. Thermal Conductivity: 0.26 at 75 degree F mean temperature.
3. Jacket: factory-applied hard, smooth, shiny gloss, rigid, high-impact PVC;
0.02 inch thick; white; 1-inch end overlap; with self-seal lap.
4. Density: 0.7 pcf.
5. Service Temperature: minus 150 degrees F to plus 400 degrees F; 0 degrees F
to 140 degrees F for jacket.
6. Clean Zone Considerations: vacuum insulation at factory to remove dust prior
to packaging.
7. Acceptable Manufacturer: Accessible Products Company Techlite SSL879.

G. Polyisocyanurate: Type PI Polyisocyanurate rigid cellular plastics.

1. Description: preformed rigid cellular polyisocyanurate plastic foam complying
with ASTM C591, Standard Specification for Unfaced Preformed Rigid
Cellular Polyisocyanurate Thermal Insulation.
2. Establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
3. Thermal Conductivitiy: 0.19 at 75 degree mean temperature.
a. Density: 2 pcf.
b. Maximum Operating Temperature: 190 degrees F.
c. Closed Cell Content: 90 percent.
d. Flame Spread/Smoke Developed Rating: 25/50 at 1 inch thickness or
less, 25/90 at 1.5 inch through 6 inch thickness.
e. Acceptable Manufacturers:
1) Dow Chemical – Trymer 2000.
2) Hitherm, LLC HT-300.

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 H. Polystyrene - Type PS Rigid Polystyrene:
1. Description: rigid board, closed cell, cellular polystyrene thermal insulation
board complying with ASTM C578, Standard Specification for Rigid, Cellular
Polystyrene Thermal Insulation.
2. Establish appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
3. Thermal Conductivity: 0.24 at 75 degree mean temperature.
4. Density: 1.6 pcf minimum.
5. Maximum Operating Temperature: 165 degrees F.
6. Flame Spread/Smoke Developed Rating:
a. Flame Spread: 5.
b. Smoke Developed: 145.
7. Acceptable Manufacturers:
a. Apache Products Company EPS Insulation Board.
b. Dow Chemical Styrofoam.
c. Owens Corning Foamular.

I. Polymer Foam - Type F, Engineered Polymer Foam Insulation (EPFI)

1. Description: Extruded tubular, black pigmented, longitudinally preslit pipe
insulation with press-sensitive factory-adhesive closure system (preglued),
nonjacketed. EPFI is a flexible, polymer-based, low-density, closed-cell,
chemically-inert pipe and sheet insulation.
2. Thermal Conductivity: 0.25 at 75 degree mean temperature.
3. Water Vapor Permeability: 0.
4. Density: 1.5 to 1.8 pcf.
5. Flame Spread/Smoke Developed Rating: 25/50, applicable up to 1 inch.
6. Maximum Operating Temperature: not to exceed 210 degrees F. Maximum
service temperature on underground piping located above water table is
150 degrees F.
7. Acceptable Manufacturers: Imcolock and Imcosheet by Imcoa.

2.2 JACKETS

A. Type A - Vapor Barrier Jackets: kraft-reinforced foil vapor barrier with self-sealing
lap, ASJ.

B. Type B - PVC:
1. Description: one piece, ultraviolet resistant, polyvinyl chloride (PVC).
2. Thickness: 0.02 cut and curled.
3. Flame Spread Rating: 25 or less.
4. Smoke Developed Rating: 50 or less.
5. Grade: weatherable.
6. Color: white.
7. Temperature Limits: zero to 140 degrees F.

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 C. Type C - Canvas: UL-listed, fire retardant treated, lagging adhesive, cotton fabric,
6-ounce-per-square-yard density, plain weave.

D. Type D - Aluminum: aluminum alloy 3003, 1100 or 3105 with H-14 temper with
factory-applied moisture barrier meeting ASTM B209, Standard Specifications for
Aluminum and Aluminum-Alloy Sheet and Plate as listed below:

Thickness
Insulated Item (Inch) Finish
Piping 0.016 Smooth or embossed
Vessels and equipment shells 0.016 Smooth or embossed
36 inch diameter and smaller
Vessels and equipment above 0.032 Smooth, embossed, or corrugated
36 inch diameter
Vessels and equipment heads, 0.032 Smooth
vessel transitions, and stiffener
rings

E. Type E, Stainless Steel - Type 304 stainless steel as listed below:

Thickness
Insulated Item (Inch) Finish
Piping 0.016 Smooth or embossed
Vessels and equipment shells 0.016 Smooth or embossed
36 inch diameter and smaller
Vessels and equipment above 0.020 Smooth, embossed, or corrugated
36 inch diameter
Vessels and equipment heads, 0.032 Smooth
vessel transitions, and stiffener
rings

F. Acceptable Manufacturers:
1. Johns Manville Zeston Ceel-Co PVC.
2. Childers.
3. Pittsburgh Corning.
4. Knauf Proto Fitting Covers.

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2.3 ACCESSORIES

A. Insulation Bands:
1. Galvanized Steel: 3/4 inch wide by 0.02 inch thick.
2. Stainless Steel, 24 Inch Diameter or Less: 1/2 inch wide by 0.015 inch thick,
Type 304.
3. Stainless Steel, Larger Than 24 Inch Diameter: 3/4 inch wide by 0.02 inch
thick, Type 304.
4. Heavy-Duty Stainless Steel: wing-type or crimp seals.

B. Insulating Cement: ASTM C195, Standard Specification for Mineral Fiber Thermal
Insulating Cement.

C. Finishing Cement: ASTM C449, Standard Specification for Miner Fiber Hydraulic –
Setting Thermal Insulation and Finishing Cement.

D. Flashing Compound: high-temperature asphalt emulsion type suitable for flashing.

E. Glass Fabric: 10-by-10 open mesh, asphalt treated, 9 ounces per square yard.

F. Wire: ties and wire, 18-gauge stainless steel, Type 304, soft annealed, or 20-gauge
galvanized steel as indicated.

G. Breather Springs: flat, spiral wound, Type 302 stainless steel.

H. Sheet Metal Screws: 1/2 inch long, No. 8, hex or pan head, stainless steel, self-
tapping.

I. Expansion/Contraction Joints: loose mineral fiber blanket or resilient fiberglass

blanket.

J. S Clips: Fabricate from 1-inch-wide by 0.032-inch Type 304 stainless steel.

K. Insulation Tape: 3/4 inch wide, glass filament reinforced, pressure sensitive.

L. Expansion/Contraction Joint Tape: 4-inch-wide foil kraft tape or material matching

insulation.

M. Weatherproof Mastic: asphalt emulsion type.

N. Adhesives: compatible with insulation.

O. Insulated Fittings: two-piece preformed/molded pipefitting material matching

insulation.

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 P. Insulated Block/Pipe Supports: molded insulated pipe and block support.

Q. Vapor Barrier Coating: emulsion-based mastic coating.

R. Acceptable Manufacturers:
1. Childers.
2. Dow Corning.
3. Johns Manville.
4. ICA Inc. HamFab Products.
5. Knauf.
6. Pittsburgh Corning.
7. RPR Products.
8. 3M.

PART 3 -- EXECUTION

3.1 INSPECTION

A. Verify that preparation work required before execution of work specified in this
Section has been completed and is acceptable.

B. Notify IDC in writing describing conditions that are not acceptable for installation of
work specified in this Section. Recommend remedial work as necessary. Do not
proceed with work of this Section until unacceptable conditions are corrected.

3.2 PREPARATION

A. Clean surfaces to be insulated.

B. Keep insulating materials clean, dry, and free of dents and abrasions.

C. Protect insulating materials from moisture damage and do not apply wet materials.
Remove wetted materials and reapply new insulation products.

D. Verify protective coating as specified in Section 09920, Painting – Equipment and

Piping is on piping, vessels, and equipment prior to installation of insulation.

E. Verify piping supports and anchors are in place prior to insulation, as specified in
Section 15140, Piping Supports and Anchors.

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3.3 INSTALLATION

A. Applied Locations:
1. Requirements: Insulate piping and equipment as indicated in
Section 15270A.tbl, Equipment Insulation Schedule, Section 15270B.tbl,
Piping Insulation Schedule, and as further described in this Section.

2. Install insulation materials after piping has been tested, inspected, coated (if
required), heat traced (if required), and approved, or request permission to
leave all joints and welds exposed until testing, inspection, and approval have
been completed.
3. Omit insulation, as listed below, unless noted otherwise on Drawings; bevel
and seal insulation ends at either side of the following:
a. Hot Piping Without Vapor Barrier:
1) Flanges and unions.
2) Valve bodies except where the fluid may solidify at ambient
temperatures.
3) Heat-traced valves, flanges, and unions located indoors.
4) Tracer line loops and unions in tracers.
5) Expansion and rotation joints, slide valves, steam traps, vents, and
drains.
6) Rotameters or other indicating devices.
b. Hot Vessels and Equipment:
1) Manhole covers, nameplates, American Society of Mechanical
Engineers (ASME) stampings, code inspection plates, nozzles,
flanges, and weepholes.
2) Flanges on heat exchangers.
3) Valve bodies except where the fluid may solidify at ambient
temperatures.
4) Indicating devices.
5) Channel and channel covers with sufficient clearance for bolt
removal without damage to insulation and square rather than
beveled edges.
c. Cold Piping with Vapor Barrier: relief valves.
4. Materials shall be installed by skilled labor regularly engaged in this type of
work. Materials shall be installed in accordance with manufacturer's
recommendations, building codes, and industry standards.
5. Locate insulation and cover seams in the least visible location. Surface
finishes shall be extended in such a manner as to protect raw edges, ends, and
surfaces of insulation.

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 6. On cold surfaces where a vapor retarder/barrier must be maintained, insulation
shall be applied with a continuous, unbroken moisture, and vapor seal.
Hangers, supports, anchors, or other projections secured to cold surfaces shall
be insulated and vapor sealed to prevent condensation.
7. Pipe insulation shall be continuous through walls, ceiling or floor openings, or
sleeves except where firestop or firesafing materials are required.
8. In dual-temperature systems, seal pipe terminations including fittings, wall
penetrations, and pipe supports with vapor barrier mastic.
9. When equipment with insulation requires periodic opening for maintenance,
repair, or cleaning, install removable insulation in such a manner that it can be
easily removed and reinstalled without damage.
10. For piping, vessels, and equipment exposed in mechanical rooms or high-
traffic areas, insulation shall be protected from abuse by the use of appropriate
thickness of PVC jacketing or metal jacketing.

B. Insulation:
1. Hot Piping:
a. 36-Inch Diameter and Smaller:
1) Material: Type, single or multiple layer as required to develop
thickness.
2) Longitudinal Joints - Stagger and secure as follows:
a) Outer Layer: Use galvanized wire ties on 9-inch centers.
b) Inner Layer: Use two galvanized wire ties per section.
3) Expansion Joints:
a) Piping Above 500 Degrees F: 1-3/4 inches wide at 24-foot
centers with joints in layers offset 12 inches on multiple-
layer installations.
b) Piping 500 Degrees F or Less: none required.
4) Flange Bolt Clearance: sufficient to remove bolts without
insulation damage with square cut edges.
5) Fittings: install prefabricated fitting covers or mitered sectional
insulation material and wire in place prior to finishing.
b. Piping Over 36-Inch Diameter: Comply with barrier requirements for
hot vessels and equipment
2. Hot Vessels and Equipment:
a. Vessels and Tubular Equipment 36 Inches and Smaller: Comply with
requirements for hot piping.
b. Vessels and Equipment Larger Than 36 Inches:
1) Material: Type, single or multiple layer as required to develop
thickness.
2) Longitudinal and Transverse Joints: Secure with stainless steel
wire on 12-inch centers.
3) Retainers: Secure with stainless bands or wire on 18-inch centers.

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 4) Exposed Heads: Secure with bands attached to top floating ring
and circumferential band at tangent line of head on 12-inch
centers.
5) Nonexposed Heads: Secure with stainless steel wire to
manufacturer-installed supports.
6) Stiffener Rings: Secure with stainless steel wire with band
centered in each ring.
c. Nontubular Equipment 36 Inches and Smaller: Comply with
requirements for vessels and equipment larger than 36 inches.
3. Cold Piping:
a. 36-Inch Diameter and Smaller:
1) Material: Type, single layer with insulation continuous through
supports and with preformed metal insulation shields at outer
surface as specified in Section 15140, Piping Supports and
Anchors.
2) Longitudinal Joints: staggered; coat edges with 1/16-inch-thick
joint sealer; secure with tape 6 inches on center and within 1/2 inch
of section ends.
3) Contraction Joints: fiberglass-packed 1-3/4 inch wide at 24-foot
centers with locations offset 12 inches on double-layer installations
and outside vapor sealed with contraction joint tape.
4) Flange Bolt Access: sufficient to remove bolts without insulation
damage with square cut edges.
5) Fittings: prefabricated fitting covers or mitered sectional
insulation material wired in place prior to finish.
6) Vapor Barrier: use a continuous, self-sealing vapor barrier jacket,
Type A, or vapor barrier coating on outer surface of insulation
prior to external finish or jacket on all piping systems operating
below ambient temperature. Seal all joints, surfaces, seams, and
fittings to prevent condensation between piping and insulation.
b. Piping Over 36-Inch Diameter: Comply with requirements for hot
vessels and equipment, except vapor jacket or vapor barrier coating is
required on piping systems operating below ambient temperature.
4. Cold Vessels and Equipment:
a. Vessels and Tubular Equipment 36 Inches and Smaller: Comply with
requirements for cold piping.
b. Vessels and Equipment Larger Than 36 Inches:
1) Material: Type, single or multiple layer as indicated.
2) Longitudinal and Transverse Joints: Stagger joints, seal joint
edges with 1/16-inch-thick layer of joint sealer, and secure with
stainless steel insulation bands on 9-inch centers.

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 3) Contraction Joints: Provide 1-3/4-inch-wide fiberglass-packed
joint at each insulation support ring, sealed with contraction joint
tape.
4) Exposed Heads: Shape to fit head contour, seal joint edges with
1/16-inch-thick layer of joint sealer, and secure with stainless steel
insulation bands attached to floating ring on top and
circumferential band at tangent line with bands at 12-inch centers.
5) Nonexposed Heads: Install similar to exposed heads except secure
insulation to attachments provided by equipment manufacturer.
6) Pumps, Compressors, and Other Irregularly Shaped Equipment:
Enclose in block insulation, seal joint edges with 1/16-inch-thick
layer of joint sealer, secure with stainless steel wire, and seal all
joints vapor tight, including bases.
7) Attachments: Extend insulation from vessel or equipment four
times nominal thickness of the insulation.
8) Vapor Barrier: use a continuous, self-sealing vapor barrier jacket,
Type A, or vapor barrier coating on outer surface of insulation
prior to exterior finish or jacket on all cold vessels and equipment
operating below ambient temperature. Seal all joints, surfaces, and
seams to prevent condensation between cold surfaces and
insulation.
c. Nontubular Equipment 36 Inches and Smaller: Comply with
requirements for vessels and equipment larger than 36 inches, except
vapor barrier jacket or vapor barrier coating is required on vessels and
equipment operating below ambient temperature.

C. Jackets:
1. Indoor:
a. Hot Piping, Vessels, and Equipment:
1) Noncorrosive and Dry Areas: Type A, factory or field applied, or
Type C, field applied and finished with insulating and finishing
cement.
2) Noncorrosive and Wet Areas: Type B or D, factory or field
applied.
3) Corrosive Areas: Type E, field applied.
b. Cold Piping, Vessels, and Equipment:
1) Noncorrosive and Dry Areas: Type A, factory or field applied to
preformed insulation with continuous vapor seal.
2) Noncorrosive and Wet Areas: Type B or D, field applied with
continuous vapor seal.
3) Corrosive Areas: Type E, field applied.

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 D. Weatherproofing:
1. Required Locations: outdoors.
2. Hot Piping, Vessels, and Equipment:
a. Straight Sections: Lap joints 2 inches and arrange to shed water with
horizontal longitudinal seams located below centerline; secured with
insulation bands on 9-inch centers or screws on 6-inch centers.
b. Fittings: prefabricated metal covers to match jacket material with sealed
longitudinal seam under pipe, secured with screws, and transverse joints
covered with insulation bands.
c. Open Insulation Ends: Cover with watertight metal flashing ring secured
and weather sealed with flashing compound.
3. Cold Piping, Vessels, and Equipment:
a. Vertical:
1) Metal Jacketing: Support with S clips; secure with stainless steel
insulation bands on 18-inch horizontal centers with one loop per
circumferential lap.
2) Vertical Seams: install screws on 12-inch centers, centered on
corrugation ridge.
b. Horizontal:
1) Metal Jacketing: Secure stainless steel insulation bands on 18-inch
centers.
2) Longitudinal Seams: Lap 2 inches; orient with seam on bottom
half of pipe.
3) Circumferential Seams: Lap 3 inches. Install jacketing to insure
water or rainfall rolls off of seams, not into seams.
c. Top Heads:
1) Metal Jacketing: Install with 6 inches turned down on the straight
side as lap and fasten to shell jacketing with screws on 5-inch
centers.
2) Circumferential Lap: Secure the head cover in place with stainless
steel insulation band.
d. Irregularly Shaped Surfaces - Insulation Finish: Apply tack coat of
weatherproof mastic and glass fabric followed by 1/8-inch-thick wet coat
of mastic with smooth finish over the glass fabric.
e. Pumps: Finish with removable metal enclosure fabricated for easy
removal for maintenance and seal with specified mastic.

3.4 FIELD QUALITY CONTROL

A. Existing Systems:
1. Repair existing insulation damaged during installation.
2. Make neat connections where new and existing insulation meet.

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 3. Where existing piping or equipment is removed, cover existing surfaces neatly
to match existing.

END OF SECTION

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