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ASTM C795-92(1998)e1

(Specification)

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

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

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 C-16, 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. These thermal insulations may be either homogeneous or non-homogeneous and either organic or inorganic.  
1.2 This standard does not purport to address all of the safety problems, 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
09-Sep-1998
ICS
27.220 - Heat recovery. Thermal insulation
Technical Committee
C16 - Thermal Insulation
Drafting Committee
C16.20 - Homogeneous Inorganic Thermal Insulations
Current Stage
Ref Project

Relations

Replaced By
ASTM C795-03 - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
Effective Date
01-Nov-2003

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ASTM C795-92(1998)e1 - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless SteelASTM C795-92(1998)e1 - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
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ASTM C795-92(1998)e1 - Standard Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
e1
Designation: C 795 – 92 (Reapproved 1998) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Thermal Insulation for Use in Contact with Austenitic
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.
e NOTE—Editorial changes were made in September 1998.
1. Scope the pertinent Annual Book of ASTM Standards.
3.2.2 lot—a lot shall be defined in accordance with Criteria
1.1 This specification covers non-metallic thermal insula-
C 390 by agreement between the purchaser and the manufac-
tion for use in contact with austenitic stainless steel piping and
turer.
equipment. In addition to meeting the requirements specified in
3.2.3 stress corrosion cracking—the failure of metal, taking
their individual material specifications, issued under the juris-
the form of cracks that may occur under the combined
diction of ASTM Committee C-16, these insulations must pass
influence of certain corrosive environments and applied or
the preproduction test requirements of Test Method C 692, for
residual stresses.
stress corrosion effects on austenitic stainless steel, and the
3.2.4 wicking-type insulation—insulation material that, by
confirming quality control, chemical requirements, when tested
virtue of its physical characteristics, permits a wetting liquid to
in accordance with the Test Methods C 871. These thermal
infiltrate it by capillary attraction.
insulations may be either homogeneous or non-homogeneous
and either organic or inorganic.
4. Significance and Use
1.2 This standard does not purport to address all of the
4.1 Stress corrosion cracking of austenitic stainless steel is a
safety concerns, if any, associated with its use. It is the
metallurgical phenomenon. One cause of stress corrosion
responsibility of the user of this standard to establish appro-
cracking is the presence of contaminants in water solution,
priate safety and health practices and determine the applica-
which can be concentrated at the stressed surface by evapora-
bility of regulatory limitations prior to use.
tion of the water.
2. Referenced Documents 4.2 There is an apparent correlation between stress corro-
sion cracking of austenitic stainless steel and the use of
2.1 ASTM Standards:
insulation which either contains water-leachable chloride or, by
C 168 Terminology Relating to Thermal Insulating Materi-
reason of its water absorptivity, may act as a vehicle through
als
which chlorides from outside the system may be concentrated
C 692 Test Method for Evaluating the Influence of Thermal
, ,
3 4 5
at the surface of the stainless steel.
Insulations on the External Stress Corrosion Cracking
4.3 Studies have shown that insulation containing certain
Tendency of Austenitic Steel
water-soluble compounds may retard or prevent chloride-
C 871 Test Methods for Chemical Analysis of Thermal
induced stress corrosion. Numerous materials thought to in-
Insulation Materials for Leachable Chloride, Fluoride,
2 hibit stress corrosion cracking have been tried with varying
Silicate, and Sodium Ions
degrees of success. An inhibiting compound commonly used is
3. Terminology sodium silicate. Present knowledge indicates that the sodium
silicate dissociates in the presence of water, leaving the silicate
3.1 Definitions—Terminology C 168 should be considered
ion to form a protective mechanism that inhibits or prevents the
as applying to the terms used in this specification.
chloride ion from attacking the stainless steel. Under adverse
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
Schaffer, L. D., and Klapper, J. A., “Investigation of the Effects of Wet,
Chloride-Bearing, Thermal Insulation on Austenitic Stainless Steel,” Report No.
ESI-25-(a)-1, Oak Ridge National Laboratory, and Ebasco Services Inc., November
This specification is under the jurisdiction of ASTM Committee C-16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on 1, 1961.
Homogeneous Inorganic Thermal Insulations. Dana, A. W., Jr., “Stress-Corrosion Cracking of Insulated Austenitic Stainless
Current edition approved June 15, 1992. Published August 1992. Originally Steel,” ASTM Bulletin, October 1957.
published as C 795 – 77. Last previous edition C 795 – 89. Louthan, M. R., Jr., “Initial Stages of Stress Corrosion Cracking in Austenitic
Annual Book of ASTM Standards, Vol 04.06. Stainless Steels,” Corrosion, NACE, September 1965.
NOTICE:¬This¬standard¬has¬either¬been¬superceded¬and¬replaced¬by¬a¬new¬version¬or¬discontinued.¬
Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
C 795
environmental conditions, this protective agent may be leached the initial submittal. If the average analysis of the two
from the product with time and permanent protection may not specimens taken from each sample fails to conform to the
be afforded. requirements of this specification, the unit of supply repre-
4.4 Test Method C 692 contains a procedure for determining sented by that sample shall be rejected. For other than chemical
whether or not chloride-induced stress corrosion cracking will analysis or stress corrosion tests, the number of tests and retests
occur with a given thermal insulation. The procedure is used to shall be as specified in the basic material specification.
evaluate insulation materials that may in themselves be pas-
12. Preproduction Corrosion Test
sive, or actively contribute to stress corros
...

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Standard Test Method for Density and Dimensions of Preformed Pipe-Covering-Type Thermal Insulation

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5.1 Density measurements of preformed pipe insulation are useful in determining compliance of a product with specification limits and in providing a relative gage of product weights. For any one kind of insulation some important physical and mechanical properties, such as thermal conductivity, heat capacity, strength, etc., bear a specific relationship with its density; however, on a density basis, these properties are not directly comparable with those for other kinds of material.  
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