ASTM C795-03

Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel

ABSTRACT
This specification covers non-metallic thermal insulation for use in contact with austenitic stainless steel piping and equipment. The material shall conform to the established requirements of the basic material specification. The physical and chemical requirements shall conform to the requirements of the basic material specification. Preproduction corrosion test and chemical analysis shall be performed to conform to the specified requirements.
SCOPE
1.1 This specification covers non-metallic thermal insulation for use in contact with austenitic stainless steel piping and equipment. In addition to meeting the requirements specified in their individual material specifications, issued under the jurisdiction of ASTM Committee C16, these insulations must pass the preproduction test requirements of Test Method C 692, for stress corrosion effects on austenitic stainless steel, and the confirming quality control, chemical requirements, when tested in accordance with the Test Methods C 871.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Oct-2003
• ICS: 27.220 - Heat recovery. Thermal insulation
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.20 - Homogeneous Inorganic Thermal Insulations

Relations

• Replaces: ASTM C795-92(1998)e1 - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
• Effective Date: 01-Nov-2003
• Replaced By: ASTM C795-08 - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
• Effective Date: 15-Oct-2008
• Referred By: ASTM C592-22a - Standard Specification for Mineral Fiber Blanket Insulation and Blanket-Type Pipe Insulation (Metal-Mesh Covered) (Industrial Type)
• Effective Date: 01-Nov-2003
• Referred By: ASTM C1393-19 - Standard Specification for Perpendicularly Oriented Mineral Fiber Roll and Sheet Thermal Insulation for Pipes and Tanks
• Effective Date: 01-Nov-2003
• Referred By: ASTM C612-14(2019) - Standard Specification for Mineral Fiber Block and Board Thermal Insulation
• Effective Date: 01-Nov-2003
• Referred By: ASTM C553-13(2019) - Standard Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications
• Effective Date: 01-Nov-2003
• Referred By: ASTM C1685-15(2021) - Standard Specification for Pneumatically Applied High-Temperature Fiber Thermal Insulation for Industrial Applications
• Effective Date: 01-Nov-2003
• Referred By: ASTM C534/C534M-23 - Standard Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in Sheet and Tubular Form
• Effective Date: 01-Nov-2003
• Referred By: ASTM C449-07(2019) - Standard Specification for Mineral Fiber Hydraulic-Setting Thermal Insulating and Finishing Cement
• Effective Date: 01-Nov-2003
• Referred By: ASTM C1696-20 - Standard Guide for Industrial Thermal Insulation Systems
• Effective Date: 01-Nov-2003
• Referred By: ASTM C610-17(2023) - Standard Specification for Molded Expanded Perlite Block and Pipe Thermal Insulation
• Effective Date: 01-Nov-2003
• Referred By: ASTM C547-22a - Standard Specification for Mineral Fiber Pipe Insulation
• Effective Date: 01-Nov-2003
• Referred By: ASTM C533-17(2023) - Standard Specification for Calcium Silicate Block and Pipe Thermal Insulation
• Effective Date: 01-Nov-2003
• Referred By: ASTM C692-13(2023) - Standard Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of Austenitic Stainless Steel
• Effective Date: 01-Nov-2003
• Referred By: ASTM C552-22 - Standard Specification for Cellular Glass Thermal Insulation
• Effective Date: 01-Nov-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 795 – 03
Standard Specification for
Thermal Insulation for Use in Contact with Austenitic
1
Stainless Steel
This standard is issued under the fixed designation C 795; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 3.2.1 basic material specification—any of the material
specifications for homogeneous insulation covered in any of
1.1 This specification covers non-metallic thermal insula-
the pertinent Annual Book of ASTM Standards.
tion for use in contact with austenitic stainless steel piping and
3.2.2 lot—a lot shall be defined in accordance with Practice
equipment.Inadditiontomeetingtherequirementsspecifiedin
C 390 by agreement between the purchaser and the manufac-
their individual material specifications, issued under the juris-
turer.
diction of ASTM Committee C16, these insulations must pass
3.2.3 stress corrosion cracking—the failure of metal, taking
the preproduction test requirements of Test Method C 692, for
the form of cracks that potentially occur under the combined
stress corrosion effects on austenitic stainless steel, and the
influence of certain corrosive environments and applied or
confirmingqualitycontrol,chemicalrequirements,whentested
residual stresses.
in accordance with the Test Methods C 871.
3.2.4 wicking-type insulation—insulation material that, by
1.2 This standard does not purport to address all of the
virtue of its physical characteristics, permits a wetting liquid to
safety concerns, if any, associated with its use. It is the
infiltrate it by capillary attraction.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use.
4.1 Stress corrosion cracking of austenitic stainless steel is a
2. Referenced Documents metallurgical phenomenon. One cause of stress corrosion
2
cracking is the presence of contaminants in water solution,
2.1 ASTM Standards:
which can be concentrated at the stressed surface by evapora-
C 168 Terminology Relating to Thermal Insulation
tion of the water.
C 390 Practice for Sampling and Acceptance of Preformed
4.2 There is an apparent correlation between stress corro-
Thermal Insulation Lots
sion cracking of austenitic stainless steel and the use of
C 692 Test Method for Evaluating the Influence of Thermal
insulationwhicheithercontainswater-leachablechlorideor,by
Insulations on the External Stress Corrosion Cracking
reason of its water absorptivity, acts as a vehicle through which
Tendency of Austenitic Steel
chlorides from outside the system are concentrated at the
C 871 Test Methods for Chemical Analysis of Thermal
, ,
3 4 5
surface of the stainless steel.
Insulation Materials for Leachable Chloride, Fluoride,
4.3 Studies have shown that insulation containing certain
Silicate, and Sodium Ions
water-soluble compounds may retard or prevent chloride-
3. Terminology
induced stress corrosion. Numerous materials thought to in-
hibit stress corrosion cracking have been tried with varying
3.1 Definitions—Terminology C 168 applies to the terms
degrees of success.An inhibiting compound commonly used is
used in this specification.
sodium silicate. Present knowledge indicates that the sodium
3.2 Definitions of Terms Specific to This Standard:
silicate dissociates in the presence of water, leaving the silicate
1
This specification is under the jurisdiction of ASTM Committee C16 on
3
Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on Schaffer, L. D., and Klapper, J. A., “Investigation of the Effects of Wet,
Homogeneous Inorganic Thermal Insulations. Chloride-Bearing, Thermal Insulation on Austenitic Stainless Steel,” Report No.
Current edition approved Nov. 1, 2003. Published November 2003. Originally ESI-25-(a)-1, Oak Ridge National Laboratory, and Ebasco Services Inc., November
e1
approved in 1977. Last previous edition approved in 1998 as C 795 – 92 (1998) . 1, 1961.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Dana, A. W., Jr., “Stress-Corrosion Cracking of Insulated Austenitic Stainless
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Steel,” ASTM Bulletin, October 1957.
5
Standards volume information, refer to the standard’s Document Summary page on Louthan, M. R., Jr., “Initial Stages of Stress Corrosion Cracking in Austenitic
the ASTM website. Stainless Steels,” Corrosion, NACE, September 1965.
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