ASTM C795-08(2018)

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 C692, for stress corrosion effects on austenitic stainless steel, and the confirming quality control, chemical requirements, when tested in accordance with the Test Methods C871.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 31-Oct-2018
• ICS: 27.220 - Heat recovery. Thermal insulation
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.20 - Homogeneous Inorganic Thermal Insulations

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C795 − 08 (Reapproved 2018)
Standard Specification for
Thermal Insulation for Use in Contact with Austenitic
1
Stainless Steel
This standard is issued under the fixed designation C795; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope C390 Practice for Sampling and Acceptance of Thermal
Insulation Lots
1.1 This specification covers non-metallic thermal insula-
C692 Test Method for Evaluating the Influence of Thermal
tion for use in contact with austenitic stainless steel piping and
Insulations on External Stress Corrosion Cracking Ten-
equipment. In addition to meeting the requirements specified in
dency of Austenitic Stainless Steel
their individual material specifications, issued under the juris-
C871 Test Methods for Chemical Analysis of Thermal Insu-
diction of ASTM Committee C16, these insulations must pass
lation Materials for Leachable Chloride, Fluoride, Silicate,
the preproduction test requirements of Test Method C692, for
and Sodium Ions
stress corrosion effects on austenitic stainless steel, and the
confirming quality control, chemical requirements, when tested
3. Terminology
in accordance with the Test Methods C871.
3.1 Definitions—Terminology C168 applies to the terms
1.2 The values stated in inch-pound units are to be regarded
used in this specification.
as standard. The values given in parentheses are mathematical
3.2 Definitions of Terms Specific to This Standard:
conversions to SI units that are provided for information only
3.2.1 basic material specification—any of the material
and are not considered standard.
specifications for homogeneous insulation covered in any of
1.3 This standard does not purport to address all of the
the pertinent Annual Book of ASTM Standards.
safety concerns, if any, associated with its use. It is the
3.2.2 lot—a lot shall be defined in accordance with Practice
responsibility of the user of this standard to establish appro-
C390 by agreement between the purchaser and the manufac-
priate safety, health, and environmental practices and deter-
turer.
mine the applicability of regulatory limitations prior to use.
3.2.3 stress corrosion cracking (SCC)—the failure of metal,
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- taking the form of cracks that potentially occur under the
combined influence of certain corrosive environments and
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- applied or residual stresses.
mendations issued by the World Trade Organization Technical
3.2.4 wicking-type insulation—insulation material that, by
Barriers to Trade (TBT) Committee.
virtue of its physical characteristics, permits a wetting liquid to
infiltrate it by capillary attraction.
2. Referenced Documents
2
2.1 ASTM Standards:
4. Significance and Use
C168 Terminology Relating to Thermal Insulation
4.1 Stress corrosion cracking of austenitic stainless steel is a
metallurgical phenomenon. One cause of stress corrosion
1
This specification is under the jurisdiction of ASTM Committee C16 on
cracking is the presence of contaminants in water solution,
Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on
Homogeneous Inorganic Thermal Insulations.
which can be concentrated at the stressed surface by evapora-
Current edition approved Nov. 1, 2018. Published December 2018. Originally
tion of the water.
approved in 1977. Last previous edition approved in 2013 as C795 – 08 (2013).
DOI: 10.1520/C0795-08R18.
4.2 There is an apparent correlation between stress corro-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sion cracking of austenitic stainless steel and the use of
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
insulation which either contains water-leachable chloride or, by
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. reason of its water absorptivity, acts as a vehicle through which
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C795 − 08 (2018)
FIG. 1 Acceptability of Insulation Material on the Basis of the Plot Points of the (Cl + F) and the (Na + SiO ) Analyses
3
chlorides from outside the system are concentrated at the 4.5 Research has indicated that in addition to the halide ion
3
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C795 − 08 (Reapproved 2013) C795 − 08 (Reapproved 2018)
Standard Specification for
Thermal Insulation for Use in Contact with Austenitic
1
Stainless Steel
This standard is issued under the fixed designation C795; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. 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 C692, for
stress corrosion effects on austenitic stainless steel, and the confirming quality control, chemical requirements, when tested in
accordance with the Test Methods C871.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C168 Terminology Relating to Thermal Insulation
C390 Practice for Sampling and Acceptance of Thermal Insulation Lots
C692 Test Method for Evaluating the Influence of Thermal Insulations on External Stress Corrosion Cracking Tendency of
Austenitic Stainless Steel
C871 Test Methods for Chemical Analysis of Thermal Insulation Materials for Leachable Chloride, Fluoride, Silicate, and
Sodium Ions
3. Terminology
3.1 Definitions—Terminology C168 applies to the terms used in this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 basic material specification—any of the material specifications for homogeneous insulation covered in any of the pertinent
Annual Book of ASTM Standards.
3.2.2 lot—a lot shall be defined in accordance with Practice C390 by agreement between the purchaser and the manufacturer.
3.2.3 stress corrosion cracking (SCC)—the failure of metal, taking the form of cracks that potentially occur under the combined
influence of certain corrosive environments and applied or residual stresses.
3.2.4 wicking-type insulation—insulation material that, by virtue of its physical characteristics, permits a wetting liquid to
infiltrate it by capillary attraction.
1
This specification is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on Homogeneous
Inorganic Thermal Insulations.
Current edition approved May 1, 2013Nov. 1, 2018. Published May 2013December 2018. Originally approved in 1977. Last previous edition approved in 20082013 as
C795 – 08.C795 – 08 (2013). DOI: 10.1520/C0795-08R13.10.1520/C0795-08R18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C795 − 08 (2018)
FIG. 1 Acceptability of Insulation Material on the Basis of the Plot Points of the (Cl + F) and the (Na + SiO ) Analyses. Analyses
3
4. Significance and Use
4.1 Stress corrosion cracking of austenitic stainless steel is a metallurgical phenomenon. One cause of stress corrosion cracking
is the presence of contaminants in water solution, which can be concentrated at the stressed surface by evaporation of the water.
4.2 There is an apparent co
...