MIL-STD-769K.pdf

AMSC N/A FSC 5640

INCH-POUND

MIL-STD-769K(SH)

29 June 2015

SUPERSEDING

MIL-STD-769J(SH)

9 October 1990

DEPARTMENT OF DEFENSE

STANDARD PRACTICE

INSULATION REQUIREMENTS FOR

U.S. NAVAL VESSELS

Downloaded from http://www.everyspec.com

MIL-STD-769K(SH)

ii iii

FOREWORD

1. This standard is approved for use by the Department of the Navy and is available for use by all

Departments and Agencies of the Department of Defense.

2. This standard covers the insulation requirements for U.S. Naval vessels. The information contained in this standard amplifies the requirements and provides standard installation practices for insulation of piping, machinery, uptakes, mechanical equipment, refrigerated spaces, vent ducts, and compartments covered in ship specifications for individual ships or classes of ships.

3. Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea

Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC

20376-5160 or emailed to CommandStandards@navy mil, with the subject line “Document Comment”. Since contact information can change, you may want to verify the currency of this address information using the ASSIST

Online database at https://assist.dla mil.

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CONTENTS

PARAGRAPH PAGE

1. SCOPE

1.1 Scope

2. APPLICABLE DOCUMENTS

2.1 General

2.2 Government documents

2.2.1 Specifications, standards, and handbooks

2.3 Non-Government publications

2.4 Order of precedence

3. DEFINITIONS

3.1 Anti-sweat insulation

3.2 Blanket insulation

3.3 Blanket insulation, metal mesh

3.4 Block insulation

3.5 Board insulation

3.6 Calcium silicate

3.7 Cellular elastomeric

3.8 Cement, finishing

3.9 Cement, insulating

3.10 Closed cell foam

3.11 Constraining layer

3.12 Corrosion

3.13 Damping

3.14 Dry film thickness (DFT)

3.15 Fibrous glass

3.16 High traffic area

3.17 Hot surface insulation

3.18 Lagging

3.19 Mineral fiber

3.20 Mineral wool

3.21 N-class division

3.22 Polyimide

3.23 Refrigerant insulation

3.24 Reusable covers

3.25 Sheathing

3.26 Temperature rise

3.27 Template

3.28 Thermal conductivity (k-factor)

3.29 Thermal insulation

3.30 Thermal insulation system

3.31 Vapor barrier

4. GENERAL REQUIREMENTS

4.1 General requirements

4.2 Materials and nominal thicknesses

4.3 Surface temperature

4.4 Design temperature

4.5 Health and safety precautions

4.6 Prohibited materials

4.6.1 Asbestos and ceramic (refractory) fiber

4.6.2 Mercury and polychlorinated biphenyls

4.6.3 Plastic, unicellular insulation, conforming to MIL-P-15280

4.6.4 Hydrochlorofluorocarbons

4.7 Recycled, recovered, environmentally preferable, or biobased materials v

4.8 Insulation requirements

4.8.1 Insulation special conditions

4.9 Exceptions to insulation requirements

4.10 Lagging

4.11 Painting

4.12 Metal sheathing

4.12.1 Lap joints for metal sheathing

4.13 Surface preparation

4.13.1 Surfaces clean and dry

4.14 Non-corrosive insulation

5. DETAILED REQUIREMENTS

5.1 Requirements for anti-sweat and refrigerant insulation

5.1.1 Thickness

5.1.2 Anti-sweat and refrigerant insulation installation requirements

5.1.3 Anti-sweat insulation exceptions

5.1.4 Tubular form and sheet form anti-sweat and refrigerant insulation

5.1.5 Anti-sweat and refrigerant cellular elastomeric insulation (tubular form) on 5-inch IPS piping and below

5.1.6 Elbows

5.1.6.1 45-degree elbow for 5-inch IPS piping and below (tubular form insulation)

5.1.6.2 90-degree elbow for 5-inch IPS piping and below (tubular form insulation)

5.1.7 Anti-sweat and refrigerant cellular elastomeric insulation (sheet form) on piping greater than 5-inch IPS

5.1.8 45- and 90-degree elbows on piping greater than 5-inch IPS (sheet form insulation)

5.1.9 Tees

5.1.10 Crosses

5.1.11 Pipe hangers

5.1.12 Flanges

5.1.13 Valves

5.1.13.1 Sheet form insulation for anti-sweat and refrigerant insulation of valves

5.1.13.1.1 Measurements for insulating the bonnet section of valve covering

5.1.14 Fittings

5.1.15 Sealing

5.1.16 Anti-sweat and refrigerant insulation for machinery and equipment

5.1.16.1 Insulation conforming to MIL-PRF-32514 (sheet form) on anti-sweat and refrigerant machinery and equipment

5.1.16.2 Fibrous-glass felt insulation conforming to MIL-I-22023 on anti-sweat and refrigerant machinery and equipment

5.1.17 Acoustic insulation treatment on anti-sweat and refrigerant machinery and equipment

5.1.18 O2N2 plant

5.2 Requirements for refrigerated stores spaces

5.2.1 Refrigerated stores spaces insulation

5.2.2 Insulation thickness

5.2.3 Interior sheathing

5.2.4 Prefabricated panels

5.2.5 Adhesives

5.2.6 Deck covering

5.2.7 Furring and framing

5.2.8 Refrigerated stores spaces installation requirements

5.2.8.1 Bulkheads and overheads

5.2.8.2 Deck underfoot

5.2.8.3 Breather openings

5.2.8.4 Refrigerated space doors

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5.2.8.5 Chill and freeze storeroom doors

5.3 Requirements for hot surface piping and piping components insulation

5.3.1 Hot surface piping and piping components insulation installation requirements

5.3.1.1 Thermal cellular elastomeric insulation (tubular form) on piping less than 5-inch IPS (temperatures up to 300 °F)

5.3.1.2 Thermal cellular elastomeric insulation (sheet form) on piping greater than 5-inch IPS (temperatures up to 300 °F)

5.3.1.3 Fibrous-glass pre-formed pipe insulation (temperatures up to 370 °F)

5.3.1.4 Polyimide-foam pre-formed pipe insulation (temperatures up to 600 °F)

5.3.1.5 Polyimide-foam thermal insulation (sheet form) on piping greater than 5-inch IPS (temperatures up to 400 °F)

5.3.1.6 Mineral fiber pre-formed sectional pipe insulation (temperatures up to 1000 °F)

5.3.1.7 Calcium silicate pre-formed sectional pipe insulation (temperatures up to 1200 °F)

5.3.2 Elbows and bends

5.3.2.1 45-degree elbow for 5-inch IPS piping and below for thermal cellular elastomeric insulation (tubular form) conforming to MIL-PRF-32514 (temperatures up to 300 °F)

5.3.2.2 45-degree and 90-degree elbows on piping greater than 5-inch IPS for thermal cellular elastomeric insulation (sheet form) conforming to MIL-PRF-32514 (temperatures up to 300 °F) and polyimide-foam thermal insulation conforming to MIL-DTL-24688 (temperatures up to 400 °F)

5.3.2.3 Pre-formed sectional insulation on elbows and bends

5.3.3 Pipe hangers

5.3.4 Valves, fittings, and flanges covers

5.3.4.1 Permanent valve and fitting covers

5.3.4.2 Reusable covers for valve bonnets and valves

5.3.4.2.1 Reusable covers construction for valves, fittings, and flanges

5.3.4.2.2 Quick removable wrap

5.3.4.2.2.1 Quick removable wrap installation

5.3.4.3 Low temperature valve and fitting reusable covers

5.3.4.4 Rigid removable covers

5.3.4.4.1 Pre-formed mineral wool insulation with hard glass cover

5.3.4.5 Reusable covers for intermittent use boiler piping systems

5.3.4.6 Weather deck hot piping

5.3.4.6.1 Preliminary surface preparation of weather deck piping

5.3.4.6.2 Weather deck pipe covering insulation

5.3.4.6.3 Insulation for weather deck piping fittings, flanges, and valves

5.3.4.6.4 Permanent covers for weather deck piping fittings, flanges, and valves

5.3.4.6.5 Removable covers for weather deck fittings, flanges, and valves

5.3.4.6.6 Hanger clamps

5.4 Requirements for thermal and acoustic insulation for machinery and equipment

5.4.1 Securement

5.4.2 Surface preparation

5.4.3 Insulation installation requirements on machinery and equipment

5.4.4 Equipment supports

5.4.5 Permanent insulation application to machinery and equipment

5.4.5.1 Block insulation application

5.4.5.2 High temperature insulation cement application

5.4.5.3 Fibrous-glass felt, mineral fiber blanket, and polyimide-foam application

5.4.6 Removable flange joint cover for turbine casings

5.4.6.1 Semi-removable turbine casing flange cover

5.4.7 Thermal insulation installation on boiler casings

5.4.7.1 Thermal insulation installation on boiler steam and water drum shells

5.4.7.2 Thermal insulation installation on boiler drum ends

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5.4.7.3 Removable cover installation on boiler drum manhole plates

5.4.7.4 Removable cover installation on superheater headers

5.4.7.5 Insulation installation on boiler uptakes and breeching

5.4.8 Thermal insulation installation to low pressure distilling plant

5.4.8.1 Removable cover installation on air ejectors, feed heater hotwell drain regulator, and feed heater waterbox flanges

5.4.8.2 Insulation installation on distillate cooler and stage condensers

5.4.9 Thermal insulation installation to auxiliary machinery, pumps, and equipment

5.4.9.1 Removable cover installation on auxiliary machinery, pumps, and equipment

5.4.10 Thermal insulation installation on unfired pressure vessels

5.4.10.1 Removable cover installation on unfired pressure vessels

5.4.11 Insulation installation on gas turbine exhaust and diesel exhaust ducts

5.4.11.1 Removable cover installation over the bolting area of access covers for exhaust ducts

5.5 Requirements for thermal insulation for ducts

5.5.1 Thermal insulation installation requirements for ducts

5.5.2 Installation procedures for thermal insulation on ducts

5.5.2.1 Polyimide insulation conforming to MIL-DTL-24688, type I and type II, classes 1, 3, and 4

5.5.2.2 Fibrous-glass felt conforming to MIL-I-22023, type I and type III

5.5.2.3 Fibrous-glass board conforming to MIL-I-742, type I and type II

5.5.2.4 Thermal cellular elastomeric insulation conforming to MIL-PRF-32514, type III

5.5.2.5 Insulation installation on ventilation heaters

5.5.2.6 Insulation installation on duct flanges

5.5.2.6.1 Flange covers constructed of fibrous-glass felt insulation conforming to MIL-I-16411

5.5.2.6.2 Flange covers constructed of fibrous-glass board conforming to MIL-I-742, type I or type II ... 62

5.5.2.6.3 Flange covers constructed of polyimide insulation conforming to MIL-DTL-24688, type II, classes 1, 3, and 4

5.5.3 Maintenance of duct insulation

5.6 Requirements for acoustic lining insulation for ducts

5.6.1 Acoustic insulation lining requirements for ducts

5.6.2 Installation of acoustic insulation lining in ducts

5.6.3 Installation of acoustic insulation lining in rectangular ducts with low air velocities (less than 2000 feet per minute)

5.7 Requirements for acoustic transmission loss treatment for ducts

5.7.1 Acoustic transmission loss requirements for ducts

5.7.2 Acoustic transmission loss treatment installation for ducts

5.7.2.1 Double wall treatment

5.7.2.2 Barium sulfate-loaded vinyl conforming to MIL-PRF-24699 or barium sulfate-loaded silicone of equal area density

5.8 Requirements for anti-sweat hull insulation materials for submarines

5.8.1 Requirements for anti-sweat hull insulation for submarines

5.8.2 Preparation of hull for installation of anti-sweat hull insulation on submarines

5.8.2.1 Installation of anti-sweat hull insulation materials on submarines

5.8.3 Insulation of submarine tank tops to prevent condensation

5.8.4 Maintenance of anti-sweat hull insulation

5.9 Requirements for thermal insulation for compartments

5.9.1 Thickness of insulation

5.9.2 Insulation installation requirements for compartments

5.9.3 Attachment of studs to compartment bulkheads

5.9.4 Fibrous-glass insulation conforming to MIL-I-742 or MIL-I-22023 installation

5.9.5 Polyimide foam conforming to MIL-DTL-24688 insulation installation

5.9.6 Underside of overhang areas exposed to weather insulation installation

5.9.7 Maintenance of compartment insulation

5.10 Requirements for acoustic absorptive and transmission loss treatments for compartments viii

5.10.1 Acoustic absorptive treatments installation requirements for compartments

5.10.2 Perforated hard-surfaced fibrous-glass board conforming to MIL-A-23054, fibrous-glass felt conforming to MIL-I-22023, and polyimide-foam acoustic absorptive insulation conforming to

MIL-DTL-24688, type II, class 2 installation

5.10.3 Acoustic treatments installed over free layer (unconstrained) and constrained damping tiles

5.10.4 Transmission loss treatment installation requirements for compartments

5.10.4.1 Transmission loss treatment installation

5.10.4.2 Transmission loss treatments for compartments on submarines

5.10.5 Maintenance of acoustic absorptive and transmission loss treatments

5.11 Requirements for high temperature fire insulation for ship’s structures

5.11.1 N-class divisions

5.11.1.1 N-class divisions, restricted or unrestricted

5.11.2 High temperature fire insulation installation requirements on ship’s structures

5.11.3 Studs and fasteners

5.11.4 High temperature fire insulation installation

5.11.5 Oil, water, vapor protection, and sheathing of high temperature fire insulation

5.11.6 High temperature fire insulation of doors and hatches

5.11.7 Penetrations through bulkheads and decks

5.11.8 Ladders, cable hangers, pipe hangers, and supports

5.11.9 High temperature fire insulation over ballistic or fragmentation protective panels

5.11.10 Maintenance of high temperature fire insulation

5.12 General maintenance of insulation

5.12.1 Repair or replacement of insulation

5.12.2 Emergency repairs of hot pipe insulation for ships at sea

5.12.2.1 Thermal insulation tape installation for emergency repairs

6. NOTES

6.1 Intended use

6.2 Acquisition requirements

6.3 Subject term (key word) listing

6.4 Changes from previous issue

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LIST OF FIGURES

FIGURE PAGE

1. Anti-sweat piping insulation penetrating bulkheads

2. 45-degree elbow installation with tubular form insulation on 5-inch IPS piping and below

3. 90-degree elbow installation with tubular form insulation on 5-inch IPS piping and below

4. 45-degree elbow installation with sheet form insulation on piping greater than 5-inch IPS

5. 90-degree elbow installation with sheet form insulation on piping greater than 5-inch IPS

6. Tee assembly

7. Cross assembly

8. Typical method of insulating cold water valve with pre-formed sectional pipe insulation

9. Bonnet section of valve covering

10. Valve body and bonnet sections of valve covering

11. Typical removable flange cover for system operating at temperatures above 450 °F

12. Permanent insulation of fitting on hot piping system using insulation felt

13. Removable covers where flange diameter is smaller than the outside diameter of the adjacent pipe covering

14. Application of thermal block insulation conforming to MIL-PRF-2819, class 2, to machinery and equipment

(temperature range 125 to 1200 °F)

15. Application of high temperature insulation cement conforming to MIL-C-2861 to machinery and equipment

(temperature range 125 to 850 °F

16. Application of fibrous-glass felt conforming to MIL-I-16411 to machinery and equipment (temperature range

125 to 1200 °F)

17. Application of mineral fiber blanket conforming to MIL-PRF-2818 to machinery and equipment (temperature range 125 to 1000 °F)

18. Turbine casing removable flange cover

19. Typical drum shell insulation

20. Drum shell manhole plate and removable cover

21. Polyimide flange cover

22. Typical acoustic insulation for rectangular ducts

23. Typical acoustic insulation for round or oval ducts

24. Typical flange connection

25. Treatment between insulated flanges, acoustic-to-thermal insulation (bottom), acoustic-to-acoustic insulation

(top)

26. Insulation fairing detail for partial treatment of duct

27. Typical installation around bolted access cover

28. Double-wall transmission loss treatment

29. Barium sulfate-loaded vinyl or silicone transmission loss treatment

30. Installation of fibrous-glass thermal insulation on beams and stiffeners

31. Acoustic absorptive treatment

32. Acoustic absorptive or thermal insulation over free layer (unconstrained) or constrained damping tiles

33. Transmission loss treatment on bulkhead

34. Transmission loss treatment butted to thermal or acoustic absorption treatment

35. Transmission loss treatment around beams and stiffeners

36. Typical submarine transmission loss treatments

37. High temperature fire insulation end treatments

38. High temperature fire insulation installation on wide and deep beams x

LIST OF FIGURES

FIGURE PAGE

39. High temperature fire insulation installations around penetration sleeves in accordance with 803-5184182

40. High temperature fire insulation installation on stiffeners under transverse frames

41. High temperature fire insulation installation on transverse bulkhead in accordance with 803-5184182

42. High temperature fire insulation with sheathing around beam

43. High temperature fire insulation treatment around doors and hatches

44. High temperature fire insulation treatment around pipe or vent penetrations

45. High temperature fire insulation around cable penetrations

46. Light or electrical equipment attachment to stiffener in accordance with Detail Y of 803-5184182 (fire insulation removed for clarity)

47. Multilayer installation of aramid fiber panels between stiffeners (fire insulation removed for clarity)

48. Installation of restraining strap and fire insulation studs over layered rigid aramid fiber panels

49. Typical installation of aramid fiber panel restraining strap showing fire insulation stud arrangement on bulkhead with vertical stiffeners (fire insulation removed for clarity)

50. Thermal insulation tape

51. Typical lateral wrapped tape application

LIST OF TABLES

TABLE PAGE

I. Thickness of anti-sweat and refrigerant insulation for piping conforming to MIL-PRF-32514

II. Thickness of anti-sweat and refrigerant insulation for machinery and equipment

III. Furring and framing materials

IV. Insulation and lagging materials for piping, tubing, valves, fittings, flange joints, and machinery

V. Thickness of insulation for hot piping conforming to MIL-PRF-32514, type I and type II; MIL-PRF-22344; and

MIL-DTL-24688, types I and III

VI. Thickness of mineral fiber insulation for hot piping conforming to ASTM C547, annex A1, type IV, grade A, 1000 °F maximum

VII. Thickness of insulation for hot piping conforming to MIL-I-2781

VIII. Thickness of insulating materials for hot surfaces of valves, fittings, and flanges up to 1,200 °F

IX. Nominal thickness of insulation for weather deck hot piping

X. Thickness of insulation materials for hot surfaces of machinery and equipment (does not include finishing cement)

XI. List of approved N-class fire-resistant divisions

XII. Thickness of insulation tape conforming to MIL-C-20079 and MIL-I-16411 for ¼-to ¾-inch size hot piping

1. SCOPE

1.1 Scope. This standard provides the insulation requirements and installation procedures for insulation on piping, machinery, uptakes, mechanical equipment, refrigerated spaces, vent ducts and compartments on U.S. Naval vessels.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this standard. This section does not include documents cited in other sections of this standard or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this standard, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FEDERAL SPECIFICATIONS

HH-P-31 - Packing and Lagging Material, Fibrous Glass Metallic and Plain Cloth and Tape

TT-P-28 - Paint, Aluminum, Heat Resisting

UU-B-790 - Building Paper, Vegetable Fiber: (Kraft, Waterproofed, Water Repellent and

Fire Resistant)

COMMERCIAL ITEM DESCRIPTIONS

A-A-59551 - Wire, Electrical, Copper (Uninsulated)

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-I-742 - Insulation Board, Thermal, Fibrous Glass

MIL-S-901 - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and

Systems, Requirements for

MIL-Y-1140 - Yarn, Cord, Sleeving, Cloth, and Tape - Glass

MIL-T-2118 - Trap, Steam, Angle, Thermostatic

MIL-I-2781 - Insulation, Pipe, Thermal

MIL-PRF-2818 - Insulation Blanket, Thermal

MIL-PRF-2819 - Insulation Block, Thermal

MIL-C-2861 - Cement, Insulation, High Temperature

MIL-D-3134 - Deck Covering Materials

MIL-A-3316 - Adhesives, Fire-Resistant, Thermal Insulation

MIL-PRF-6855 - Rubber, Synthetic, Sheets, Strips, Molded or Extruded Shapes

MIL-P-15280 - Plastic, Material, Unicellular (Sheets and Tubes)

MIL-I-16411 - Insulation Felt, Thermal, Glass Fiber

MIL-P-17549 - Plastic Laminates, Fibrous Glass Reinforced, Marine Structural

MIL-L-19140 - Lumber and Plywood, Fire-Retardant Treated

MIL-PRF-19565 - Coating Compounds, Thermal Insulation, Fire - and Water-Resistant, Vapor

Barrier

MIL-C-20079 - Cloth, Glass; Tape, Textile Glass; and Thread, Glass and Wire-Reinforced

Glass

MIL-R-21607 - Resins, Polyester, Low Pressure Laminating, Fire Retardant

MIL-I-22023 - Insulation Felt, Thermal and Sound Absorbing Felt, Fibrous Glass, Flexible

MIL-PRF-22344 - Insulation, Pipe, Thermal

MIL-C-22395 - Compound, End Sealing, Thermal Insulation Pipe Covering-, Fire-, Water-, and Weather-Resistant

MIL-A-23054 - Acoustic Absorptive Board, Fibrous Glass Perforated Fibrous Glass Cloth

Faced

MIL-PRF-23377 - Primer Coatings: Epoxy, High-Solids

MIL-S-24149 - Studs Welding and Arc Shields (Ferrules), General Specification for

MIL-S-24149/1 - Stud, Welding, and Arc Shields (Ferrules); Type I, Class 1, 2, 3, and Type II, Class 1, 4, 5, 5a, 6, Carbon Steel, For Direct Energy, Arc Welding

MIL-S-24149/2 - Studs, Welding, and Arc Shields (Ferrules); Type III, Class 1, 2, 3, and Type

IV, Class 1, 2, 3, 4, 5, 6, Aluminum Alloy, for Direct Energy Arc Welding

MIL-S-24149/4 - Studs, Welding, Type VI, Class 1, 2, 3, Carbon Steel, for Stored Energy

(Capacitor Discharge) Arc Welding

MIL-S-24149/5 - Studs, Welding, Type VII, Class 1, 2, 3, Aluminum Alloy, for Stored Energy

(Capacitor Discharge) Arc Welding

MIL-PRF-24172 - Insulation, Plastic, Cellular Foam, Rigid, Preformed and Foam-In-Place

MIL-A-24179 - Adhesive, Flexible Unicellular – Plastic Thermal Insulation

MIL-I-24391 - Insulation Tape, Electrical, Plastic Pressure-Sensitive

MIL-DTL-24441 - Paint, Epoxy-Polyamide, General Specification for

MIL-A-24456 - Adhesive for Plastic Vibration-Damping Tile

MIL-PRF-24596 - Coating Compounds, Nonflaming, Fire-Resistant (Metric)

MIL-DTL-24607 - Enamel, Interior, Nonflaming (Dry), Chlorinated Alkyd Resin, Semigloss

MIL-DTL-24688 - Insulation, Thermal and Acoustic Absorptive, Cellular Polyimide Foam

MIL-PRF-24699 - Acoustical Transmission Loss Barrier Material

MIL-PRF-32161 - Insulation, High Temperature Fire Protection, Thermal and Acoustic

MIL-PRF-32514 - Anti-Sweat, Refrigerant, and Thermal Foam Insulation

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-1689 - Fabrication, Welding, and Inspection of Ships Structure

MIL-STD-3020 - Fire Resistance of U.S. Naval Surface Ships

(Copies of these documents are available online at http://quicksearch.dla.mil/.)

2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

DEPARTMENT OF COMMERCE VOLUNTARY PRODUCT STANDARD

Voluntary Product Standard PS-1 - Structural Plywood

(Copies of this document are available online at http://gsi.nist.gov/.)

DEPARTMENT OF THE NAVY

NUC SPECIFICATION. NO. 120569MA-R2 - Acoustical Barrier Material

(Copies of this document are available from Naval Ocean Systems Center, Code 523, San Diego, CA 92152.)

OPNAV INSTRUCTIONS

OPNAVINST 5100.19 - Navy Safety and Occupational Health Program Manual for Forces

Afloat

OPNAVINST 5100.23 - Navy Safety And Occupational Health Program Manual

(Copies of these documents are available online at https://doni.daps.dla mil.)

NAVAL SEA SYSTEMS COMMAND (NAVSEA) DRAWINGS

803-2145518 - Sprayshields for Mechanical Joints

803-5184182 - Insulation, Passive Fire Protection – Installation Details

804-841336 - Piping Boiler Soot Blower

804-1385781 - Hangers, Pipe, for Surface Ships

804-5773931 - Insulation for Compartments, Acoustic and Thermal – Installation Details

804-5773932 - Insulation for Ducts, Acoustic and Thermal, Installation Details

804-5959212 - Surface Ship Machinery Insulation – Installation Details

804-5959214 - Piping Insulation – Installation Details

S4823-1385782 - Hangers, Pipe, for Submarines

(Copies of these documents are available from the applicable repositories listed in S0005-AE-PRO-010/EDM, which can be obtained online at https://nll.ahf nmci.navy.mil, may be requested by phone at 215-697-2626, or may be requested by email at nllhelpdesk@navy.mil. Copies of these documents may also be obtained from the Naval

Ships Engineering Drawing Repository (NSEDR) online at https://199.208.213.105/webjedmics/index.jsp. To request an NSEDR account for drawing access, send an email to

NNSY JEDMICS NSEDR HELP DESK@navy.mil.)

NAVAL SEA SYSTEMS COMMAND (NAVSEA) PUBLICATIONS

S9086-GY-STM-010 - NSTM Chapter 221, Boilers

S9086-RK-STM-010 - NSTM Chapter 505, Piping Systems

S9086-VH-STM-010 - NSTM Chapter 635, Thermal, Fire, and Acoustic Insulation

S9510-AB-ATM-010 - Nuclear Powered Submarine Atmosphere Control Manual, Chapter

“Material Control Program”

T9074-AD-GIB-010/1688 - Requirements for Fabrication, Welding, and Inspection of Submarine

Structure

(Copies of these documents are available online at https://nll.ahf.nmci navy mil.)

(Copies of the chapter titled “Material Control Program” are available by email request to commandstandards@navy mil.)

NAVAL SEA SYSTEMS COMMAND (NAVSEA) STANDARD ITEM

Standard Item 009-32 - Cleaning and Painting Requirements; accomplish

(Copies of this document are available online at http://www.navsea.navy.mil/CNRMC/SERMC/SSRAC1/standard.aspx or ssrac.navy mil.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

AMERICAN WOOD-PRESERVERS ASSOCIATION

AWPA-P5 - Standard for Waterborne Preservatives

(Copies of this document are available online at www.awpa.com.)

ASTM INTERNATIONAL

ASTM A108 - Standard Specification for Steel Bar, Carbon and Alloy, Cold Finished

ASTM A240/A240M Standard Specification for Chromium and Chromium-Nickel Stainless

Steel Plate, Sheet, and Strip for Pressure Vessels and for General

Applications

ASTM A390 - Standard Specification for Zinc Coated (Galvanized) Steel Poultry Fence

Fabric (Hexagonal and Straight Line)

ASTM A641/A641M - Standard Specification for Zinc Coated (Galvanized) Carbon Steel Wire

ASTM A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-

Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM B209 - Standard Specification for Aluminum and Aluminum-Alloy Sheet and

Plate

ASTM C449 - Standard Specification for Mineral Fiber Hydraulic-Setting Thermal

Insulating and Finishing Cement

ASTM C474 - Standard Test Methods for Joint Treatment Materials for Gypsum Board

Construction

ASTM C547 - Standard Specification for Mineral Fiber Pipe Insulation

ASTM C595/C595M - Standard Specification for Blended Hydraulic Cements

ASTM C610 - Standard Specification for Molded Expanded Perlite Block and Pipe

Thermal Insulation

ASTM D412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic

Elastomers - Tension

ASTM D1002 - Standard Test Method for Apparent Shear Strength of Single-Lap-Joint

Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-

Metal)

ASTM D1062 - Standard Test Method for Cleavage Strength of Metal-to-Metal Adhesive

Bonds

ASTM D1781 - Standard Test Method for Climbing Drum Peel for Adhesives

ASTM D3953 - Standard Specification for Strapping, Flat Steel and Seals

ASTM D6123/D6123M - Standard Specification for Pressure-Sensitive Tape for Light Duty

Packaging and General Purpose Masking

ASTM D6411/D6411M - Standard Specification For Silicone Rubber Room Temperature

Vulcanizing Low Outgassing Materials

ASTM F683 - Standard Practice for Selection and Application of Thermal Insulation for

Piping and Machinery

ASTM F1267 - Standard Specification for Metal, Expanded, Steel

(Copies of these documents are available online at www.astm.org.)

SAE INTERNATIONAL

SAE-AMS-QQ-A-250/3 - Aluminum Alloy Alclad 2014, Plate and Sheet

SAE-AMS-QQ-A-250/8 - Aluminum Alloy 5052, Plate and Sheet

(Copies of these documents are available online at www.sae.org.)

UNDERWRITERS LABORATORIES, INC. (UL)

UL 1709 - Standard for Rapid Rise Fire Tests of Protection Materials for Structural Steel.

(Copies of this document are available online at www.comm-2000.com.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. DEFINITIONS

3.1 Anti-sweat insulation. A type of thermal insulation applied on components to either prevent formation of condensation on their external surfaces or to limit absorption of external heat which would be detrimental to the system operation.

3.2 Blanket insulation. A flexible, coherent insulation supplied flat or in roll form.

3.3 Blanket insulation, metal mesh. A blanket insulation covered by flexible metal-mesh facings attached on one or both sides.

3.4 Block insulation. Rigid insulation pre-formed into rectangular or square units.

3.5 Board insulation. Semi-rigid insulation pre-formed into rectangular or square units having a degree of suppleness particularly related to their geometrical dimensions.

3.6 Calcium silicate. Insulation composed principally of hydrous calcium silicate, and which usually contains reinforcing fibers.

3.7 Cellular elastomeric. Insulation composed principally of natural or synthetic elastomers, or comprised of a blend of both, processed to form flexible, semi-rigid, or rigid foam which has a predominantly closed-cell structure.

3.8 Cement, finishing. A mixture of dry fibrous or powdery materials, or both, that when mixed with water develops a plastic consistency, and when dried in place forms a hard, protective surface.

3.9 Cement, insulating. A mixture of dry granular, flaky, fibrous, or powdery materials that when mixed with water develops a plastic consistency, and when dried in place forms a coherent covering that affords substantial resistance to heat transmission.

3.10 Closed cell foam. A material comprised predominantly of individual non-interconnecting cellular voids.

3.11 Constraining layer. Constraining layer is a medium strength steel or aluminum alloy plate which varies in thickness according to the thickness of the steel structure that is to be damped. A constraining layer generally is used on steel structures that are ¾ inch or greater in thickness. The purpose of the constraining layer is to limit extensional distortion of the damping tile when undergoing mechanical deformation, thereby increasing shear distortion with consequent improvement in damping efficiency. The constraining layer always is bonded to the damping tile.

3.12 Corrosion. Deterioration by chemical action, such as rust on steel.

3.13 Damping. Damping is the process of reducing the amplitude of vibrations as they travel through a structure. This reduction is accomplished by applying to the structure a material that has an inherent viscous loss.

3.14 Dry film thickness (DFT). The thickness of a paint or coating after it has dried or cured, measured in mils.

3.15 Fibrous glass. A synthetic vitreous fiber insulation made by melting predominantly silica sand and other inorganic materials, and then physically forming the melt into fibers.

3.16 High traffic area. An area subject to wear and damage during normal, routine operations.

3.17 Hot surface insulation. A type of thermal insulation applied on external surfaces of components which are

125 °F or higher to protect personnel and limit undesirable heat transfer.

3.18 Lagging. A protective covering, such as fibrous-glass cloth or tape, applied over the insulation material.

3.19 Mineral fiber. Insulation composed principally of fibers manufactured from rock, slag, or glass, with and without binders.

3.20 Mineral wool. A synthetic vitreous fiber insulation made by melting predominantly igneous rock, and or furnace slag, and other inorganic materials, and then physically forming the melt into fibers.

3.21 N-class division. N-class divisions are fire-resistant divisions formed by bulkheads and decks (overheads) that are designed to protect against structural failure a prevent the passage of flame or hot gases when exposed to a rapid rise hydrocarbon fire exposure (Class B), described in “Method of Fire Tests for Fire Resistance of Bulkheads and Decks (Overheads)” of MIL-STD-3020, after shock testing in accordance with MIL-S-901. The minimum fire test duration is 30 minutes.

3.22 Polyimide. Insulation composed of the reaction product in which the bonds formed between monomers during polymerization are essentially imide units forming a cellular structure.

3.23 Refrigerant insulation. A type of thermal insulation applied on external surfaces of components conveying cold fluids, such as refrigerant or brine, to limit absorption of heat by the refrigerant and to prevent ice formation on the surfaces.

3.24 Reusable covers. Machinery covering or pipe covering which can be removed without being damaged and easily replaced for continued use.

3.25 Sheathing. A protective covering of sheet metal applied over the insulation material to protect it from being damaged.

3.26 Temperature rise. The difference between the actual temperature and the initial temperature.

3.27 Template. A gauge or pattern, such as a thin plate or board, used as a guide during fabrication or cutting of a piece or component to ensure that it conforms to the shape or contour desired.

3.28 Thermal conductivity (k-factor). The rate of heat flow through one inch of a homogeneous material.

3.29 Thermal insulation. A material used to provide resistance to heat flow.

3.30 Thermal insulation system. Applied or installed thermal insulation complete with adhesive, lagging, and vapor barrier or paint.

3.31 Vapor barrier. A covering or coating applied to the surface of insulation to prevent the penetration of water vapor.

4. GENERAL REQUIREMENTS

4.1 General requirements. The general requirements specified herein shall apply to insulation materials, their applications, temperature ranges, thicknesses, and installation procedures used on piping, machinery, uptakes, mechanical equipment, refrigerated spaces, vent ducts and compartments on U.S. Naval vessels.

4.1.1 Discussion. Specific areas to be insulated, along with the type and thickness of insulation materials to be installed, are as specified (see 6.2). In the absence of those specific details, the following requirements describe the general areas of usage and the considerations governing use of insulation materials.

4.2 Materials and nominal thicknesses. Materials approved for insulation and lagging, and their nominal acceptable thicknesses for their specific applications and temperature ranges, shall be as specified in tables I through

XII.

4.3 Surface temperature. The thicknesses specified in this document for hot surface insulation are designed to maintain the surface temperature of the insulation at or below 125 °F for fluid temperatures up to 650 °F. For fluid temperatures above 650 °F, the surface temperature of the insulation shall be maintained at a maximum of 133 °F.

4.4 Design temperature. The selected design ambient air temperature of 85 °F does not represent maximum air temperatures in engine rooms and machinery spaces; however, it is a median temperature that when combined with

125 °F surface temperature results in a heat loss of 77.4 Btu/(ft /h).

4.5 Health and safety precautions. Health and safety precautions shall be rigidly adhered to when handling dust and fiber-producing materials. When work is performed on older ships, extra care shall be exercised to ensure that personnel do not come into contact with asbestos-containing products. Permissible levels of exposure, hygienic control measures, protective equipment, medical surveillance requirements and other pertinent data governing occupational hazards involved in applying, removing, using, handling, storing, processing, disposing of, or transporting insulation materials are addressed in OPNAVINST 5100.19 and OPNAVINST 5100.23.

4.6 Prohibited materials.

4.6.1 Asbestos and ceramic (refractory) fiber. The installation of asbestos and ceramic (refractory) fiber containing insulation and lagging materials shall be prohibited. Where previously installed asbestos or ceramic

(refractory) fiber containing insulation and lagging materials are removed, restoration shall be with non-asbestos or non-ceramic (refractory) containing insulation and lagging materials, as specified herein. Asbestos guidance concerning safety and health policy issues and requirements on asbestos for forces afloat is contained in

OPNAVINST 5100.19.

4.6.2 Mercury and polychlorinated biphenyls. Insulation materials shall be free of mercury and polychlorinated biphenyls.

4.6.3 Plastic, unicellular insulation, conforming to MIL-P-15280. Plastic, unicellular insulation conforming to

MIL-P-15280 shall not be installed. Where previously installed insulation material conforming to MIL-P-15280 is removed from anti-sweat piping, machinery, and ventilation ducting, restoration shall be with the approved materials conforming to MIL-PRF-32514. Where previously installed insulation conforming to MIL-P-15280 is removed from submarine hulls (prior to SSN 21 class), restoration shall be with the approved fire-resistant, anti-sweat submarine hull insulation materials (see 5.8.a.(1) and 5.8.a.(2)).

4.6.4 Hydrochlorofluorocarbons . Hydrochlorofluorocarbons shall not be used as a component of or blowing agent for any type of insulation used aboard U.S. Naval vessels.

4.7 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered, environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promote economically advantageous life cycle costs.

4.8 Insulation requirements. Insulation, in general, should be used on all components, piping, machinery, and equipment having external surface temperatures of 125 °F and higher.

4.8.1 Insulation special conditions. The following special conditions shall supplement or modify the selection of insulation materials, thicknesses, and installation procedures specified herein, when applicable:

a. Apply insulation only when pipes are clean, dry, and unheated.

b. Do not compress the insulation. The insulating properties of the material can be greatly reduced when the insulation is compressed.

c. Do not exceed the maximum recommended service temperatures for each type of insulation as specified in table IV.

d. Fibrous glass and mineral wool pipe insulations shall not be used in high-traffic areas in horizontal orientations 4 feet or less above the deck unless in a vertical orientation.

e. Ensure all voids and joints in calcium silicate insulation are filled with cement conforming to MIL-C-2861.

Allow the cement to dry completely in accordance with manufacturer’s instructions prior to applying lagging.

f. Follow all manufacturers’ instructions with regard to application temperature and cure times for cements and adhesives.

g. Pre-formed piping insulation shall be utilized wherever possible in order to reduce installation time and effort.

h. Calcium silicate pre-formed sectional pipe insulation conforming to MIL-I-2781 and block insulation conforming to MIL-PRF-2819 are recommended for use in “high traffic” areas.

i. Reduce the insulation thickness on soot blower piping between the root valve and the soot blower heads to one-half that indicated for a system normally at the same temperature.

j. Use the materials specified in S9086-VH-STM-010 for repair or replacement of piping and machinery insulation. Procedures for the repair and replacement of insulation are specified in S9086-VH-STM-010.

k. Where hot surface insulation thicknesses are not specified, and for special applications, ensure that the insulation thickness is sufficient to reduce the insulation surface temperature to the values specified in 4.3.

l. Do not use adhesives containing halogenated solvents for submarine applications.

m. Do not install insulation on 2 feet of pipe immediately upstream of thermostatic steam traps, conforming to

MIL-T-2118. Install a removable cover, consisting of two layers of fibrous-glass cloth conforming to

MIL-C-20079, over the uninsulated pipe and the thermostatic trap.

n. Do not insulate small diameter hot piping or ½-inch iron pipe size (IPS) and under when the operating temperatures are less than 125 °F.

o. Provide sheathing on un-insulated hot pipes only where such pipes are readily accessible to contact with personnel.

p. Certify insulation materials installed in submarines and assign a usage category of “limited” or “permitted” in accordance with the off-gassing requirements of S9510-AB-ATM-010.

q. Install fibrous-glass cloth lagging conforming to MIL-C-20079 to protect insulation in high traffic areas where the insulation is subject to wear and damage from routine operations.

r. Do not braze or weld clips, hooks, or other fastenings for securing insulation or lagging to nonferrous parts of distilling plants or deaerating feed tanks.

4.9 Exceptions to insulation requirements. Exceptions to the insulation requirements specified in 4.8 shall be as follows:

a. Any hot surface for which freedom from insulation is essential for its proper operation, such as a boiler gauge glass.

b. Relief valves, and piping beyond the valve discharge, except as required for personnel protection.

c. Pressure gauge piping.

d. Soot-blower valve units and soot-blower flanges.

e. Piping in bilges.

f. Piping in voids and cofferdams except where omitting insulation may be detrimental to system operation, such as catapult steam.

g. Safety-valve bodies, springs, and lifting gear.

h. Mechanical joints exposed to sub-atmospheric pressures.

i. Piping over shower stalls, behind, and under lavatories.

j. Steam and water piping under and around kettles in galley wet deck area. Where there is danger of personnel coming into contact with hot piping, provide protection with a perforated corrosion-resistant steel (CRES) or aluminum sheathing that surrounds the pipe with approximately a ½-inch standoff from the pipe.

k. Valves or flanges on sewage collection, holding, and transfer system.

4.10 Lagging. Lagging conforming to MIL-C-20079 (standard or rewettable) shall be applied over insulation where necessary to protect it from wear and abuse during routine operations as follows:

a. Apply a coat of adhesive conforming to MIL-A-3316 to the outer surface of the insulation.

b. Apply fibrous-glass cloth lagging conforming to MIL-C-20079 over the adhesive conforming to

MIL-A-3316 and insulation.

c. Apply a coat of adhesive conforming to MIL-A-3316 over the lagging prior to painting.

d. Use a lagging system if lagging was required to pass the fire test of MIL-PRF-32514, in all cases where adhesive, flexible unicellular conforming to MIL-A-24179 is used.

4.11 Painting. Insulation shall be painted in accordance with Standard Item 009-32 as applicable, and as follows:

a. Insulation within laundries, sculleries, galleys, drying rooms, storerooms, wash rooms, on the warm side of refrigerated stores spaces and anti-sweat insulation shall be painted as follows:

(1) Apply three brush coats of vapor barrier compound conforming to MIL-PRF-19565. Ensure that the vapor barrier compound is pigmented orange and white and the three coats are applied as white/orange/white.

(2) After the vapor barrier compound has dried, apply one coat of paint conforming to MIL-PRF-24596

(use Type I, Grade C, Classes 1 or 2 when ambient or surface temperatures are less than 50 °F) or MIL-DTL-24607, 2 to 4 mils dry film thickness (DFT), over the vapor barrier conforming to MIL-PRF-19565. Apply a second coat of paint conforming to MIL-PRF-24596 or MIL-DTL-24607, 2 to 4 mils DFT.

b. Thermal insulation on hull, ventilation ducting, and piping shall be painted as follows:

(1) Apply one coat of paint 2 to 4 mils DFT conforming to MIL-PRF-24596 (use Type I, Grade C, Classes 1 or 2 when ambient or surface temperatures are less than 50 °F) or MIL-DTL-24607.

(2) Apply a second coat of paint conforming to MIL-PRF-24596 or MIL-DTL-24607, 2 to 4 mils DFT only for hiding, if required.

c. Acoustic absorptive insulation shall be painted as follows:

(1) Apply one thin coat of paint conforming to MIL-PRF-24596 (use Type I, Grade C, Classes 1 or 2 when ambient or surface temperatures are less than 50 °F) or MIL-DTL-24607.

(2) The paint shall be sprayed in a thin coat and care taken to prevent the paint from bridging or sealing the perforations in the acoustical treatment.

4.12 Metal sheathing. Metal sheathing is generally required to protect the insulation from being subjected to damage in high traffic areas, as well as for personnel protection for prevention of burn hazards. The following are approved materials:

a. CRES, conforming to ASTM A240/A240M, Type 304, with a nominal thickness of 28 gauge.

b. Hot-dipped galvanized steel, conforming to ASTM A653/653M, coating designation G-115, with a nominal thickness of 28 gauge, or with a nominal thickness of 22 gauge for use on uptakes only.

c. Aluminum, conforming to ASTM B209, Alloy 6061, or aluminum alloy, plate and sheet, conforming to

ASTM B209, with a nominal thickness of 22 gauge.

d. Aluminum, conforming to ASTM B209, Alloy 5052, or aluminum alloy, plate and sheet, conforming to

SAE-AMS-QQ-A-250/8, with a nominal thickness of 22 gauge.

4.12.1 Lap joints for metal sheathing. Metal sheathing, where required, shall be installed with lap joints, secured with hardened self-tapping screws, rivets, or metal bands. Joints shall be arranged in a manner which shall facilitate run-off of impinging liquids.

4.13 Surface preparation. All surfaces to which insulation is applied shall be prepared in accordance with the requirements of Standard Item 009-32 as applicable or as specified (see 6.2) prior to installation of insulation.

4.13.1 Surfaces clean and dry. All surfaces to which insulation is applied shall be clean, free of grease and oil, and dry.

4.14 Non-corrosive insulation. All insulation materials shall be non-corrosive to metals on U.S. Naval vessels.

5. DETAILED REQUIREMENTS

5.1 Requirements for anti-sweat and refrigerant insulation. Anti-sweat and refrigerant insulation shall conform to the insulation, adhesives, fasteners, lagging, vapor barrier, and paint materials as follows:

a. Insulation, anti-sweat and refrigerant, thermal foam conforming to MIL-PRF-32514.

b. Insulation felt, thermal and sound absorbing, fibrous glass, flexible conforming to MIL-I-22023.

c. Insulation felt, thermal, glass fiber conforming to MIL-I-16411.

d. Adhesive, flexible unicellular conforming to MIL-A-24179. In all cases, the adhesive used to install the insulation shall be equivalent to that used to qualify the insulation in accordance with MIL-PRF-32514. If the material also required the use of a lagging system to qualify to this test, the same lagging system shall be used.

e. Adhesives, fire-resistant, thermal insulation conforming to MIL-A-3316.

f. Coating compounds, thermal insulation, fire and water-resistant, vapor barrier conforming to

MIL-PRF-19565.

g. Zinc-coated (galvanized) carbon steel wire conforming to ASTM A641/A641M.

h. Wire, electrical, copper (uninsulated) conforming to A-A-59551.

i. Mineral fiber hydraulic setting thermal insulating and finishing cement conforming to ASTM C449.

j. Light-duty packaging and general purpose masking conforming to ASTM D6123/6123M.

k. Cloth, glass; tape, textile glass; and thread, glass, and wire-reinforced glass conforming to MIL-C-20079.

l. Building paper, vegetable fiber: kraft, waterproofed, water repellent and fire resistant conforming to

UU-B-790.

m. Enamel, interior, nonflaming (dry), chlorinated alkyd resin, semigloss conforming to MIL-DTL-24607.

n. Coating compounds, nonflaming, fire-protective resistant conforming to MIL-PRF-24596.

5.1.1 Thickness. Anti-sweat and refrigerant insulation shall be of the materials and thicknesses specified in tables I and II.

TABLE I. Thickness of anti-sweat and refrigerant insulation for piping conforming to MIL-PRF-32514.

Pipe Size

(inches)

Temperature

Range (°F)

Nominal Thickness (inches)

Non-Air Conditioned

Spaces

Air Conditioned

Spaces

Air Conditioned

Spaces Open to

Weatherdeck 1/

All

-20 to -1 1½ 1 2

0 to 40 1 ¾ 1½

41 to 125 ¾ ½ 1

NOTE: Wherever possible, double layers or double thickness of insulation shall be used where piping is exposed to high humidity conditions. An example is a space that is in close proximity to the weather deck or outside doors and subject to outside air exposure.

TABLE II. Thickness of anti-sweat and refrigerant insulation for machinery and equipment.

Temperature Range (°F) Defense Specification

Nominal Thickness (inches)

Non-Air Conditioned

Spaces Air Conditioned Spaces

-20 to 40 MIL-PRF-32514 2 1

41 to 125

MIL-PRF-32514 ¾ ½

MIL-I-22023, Type I 1 ½

NOTE: In some cases, fibrous-glass thermal and sound absorbing insulation felt conforming to MIL-I-22023, Type

I, Class 6 is used as an anti-sweat insulation for submarine tank tops.

5.1.2 Anti-sweat and refrigerant insulation installation requirements. Unless otherwise specified in this section, components and piping handling fluids in the 28 to 99 F temperature range shall be insulated with anti-sweat insulation conforming to MIL-PRF-32514 and lagged with fibrous-glass cloth conforming to

MIL-C-20079 where required. Flexible hoses shall be insulated with removable and reusable insulation without any lagging. When installing anti-sweat insulation, the following requirements apply:

a. Anti-sweat insulation shall be installed on systems which are not in operation. Anti-sweat insulation shall be installed on clean, dry lines.

b. The insulation shall not be compressed. On cold pipes, condensation may occur where the insulation is compressed.

c. The insulation shall not be stretched. The insulation should be pushed rather than pulled in order avoid reduction in thickness and stress on the insulation.