ASTM F38-00(2006)

Standard Test Methods for Creep Relaxation of a Gasket Material

SIGNIFICANCE AND USE
These test methods are designed to compare related materials under controlled conditions and their ability to maintain a given compressive stress as a function of time. A portion of the torque loss on the bolted flange is a result of creep relaxation. Torque loss can also be caused by elongation of the bolts, distortion of the flanges, and vibration; therefore, the results obtained should be correlated with field results. These test methods may be used as a routine test when agreed upon between the consumer and the producer.
Note 1—Test Method B was developed using asbestos gasket materials and at issuance substantiating data were not available for other gasket materials.
FIG. 1 Relaxometer, Test Method A
SCOPE
1.1 These test methods provide a means of measuring the amount of creep relaxation of a gasket material at a predetermined time after a compressive stress has been applied.
1.1.1 Test Method A Creep relaxation measured by means of a calibrated strain gauge on a bolt.
1.1.2 Test Method B Creep relaxation measured by means of a calibrated bolt with dial indicator.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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: 30-Sep-2006
• ICS: 21.140 - Seals, glands
• Technical Committee: F03 - Gaskets
• Drafting Committee: F03.20 - Mechanical Test Methods

Relations

• Replaces: ASTM F38-00 - Standard Test Methods for Creep Relaxation of a Gasket Material
• Effective Date: 01-Oct-2006
• Replaced By: ASTM F38-00(2014) - Standard Test Methods for Creep Relaxation of a Gasket Material
• Effective Date: 01-Mar-2014
• Referred By: ASTM F104-11(2020) - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 01-Oct-2006
• Referred By: ASTM F37-06(2019) - Standard Test Methods for Sealability of Gasket Materials
• Effective Date: 01-Oct-2006
• Referred By: ASTM F1276-23 - Standard Test Method for Creep Relaxation of Laminated Composite Gasket Materials
• Effective Date: 01-Oct-2006
• Referred By: ASTM F607-03(2019) - Standard Test Method for Adhesion of Gasket Materials to Metal Surfaces
• Effective Date: 01-Oct-2006

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: F38 − 00(Reapproved 2006)
Standard Test Methods for
1
Creep Relaxation of a Gasket Material
ThisstandardisissuedunderthefixeddesignationF38;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) 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 2.2 ASTM Adjuncts:
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Relaxometer, Method A (F38)
1.1 These test methods provide a means of measuring the
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Relaxometer, Method B (F38)
amount of creep relaxation of a gasket material at a predeter-
mined time after a compressive stress has been applied.
3. Summary of Test Methods
1.1.1 Test Method A—Creep relaxation measured by means
of a calibrated strain gauge on a bolt.
3.1 In both test methods the specimen is subjected to a
1.1.2 Test Method B—Creep relaxation measured by means
compressivestressbetweentwoplatens,withthestressapplied
of a calibrated bolt with dial indicator.
by a nut and bolt.
1.2 The values stated in SI units are to be regarded as
3.2 InTestMethodA,normallyrunatroomtemperature,the
standard. The values given in parentheses are for information
stress is measured by a calibrated strain gauge on the bolt. In
only.
running the test, strain indicator readings are taken at intervals
of time, beginning at the loading time, to the end of the test.
1.3 This standard does not purport to address all of the
The strain indicator readings are converted to percentages of
safety concerns, if any, associated with its use. It is the
the initial stress which are then plotted against the log of time
responsibility of the user of this standard to establish appro-
in hours. The percentage of initial stress loss or relaxation can
priate safety and health practices and determine the applica-
be read off the curve at any given time, within the limits of the
bility of regulatory limitations prior to use.
total test time.
2. Referenced Documents
3.3 InTestMethodB,runatroomorelevatedtemperatures,
2
2.1 ASTM Standards:
the stress is determined by measuring the change in length of
A193/A193MSpecification for Alloy-Steel and Stainless
the calibrated bolt with a dial indicator. The bolt length is
Steel Bolting for High Temperature or High Pressure
measured at the beginning of the test and at the end of the test;
Service and Other Special Purpose Applications
from this the percentage of relaxation is calculated.
B637Specification for Precipitation-Hardening and Cold
Worked Nickel Alloy Bars, Forgings, and Forging Stock
4. Significance and Use
for Moderate or High Temperature Service
4.1 These test methods are designed to compare related
D3040Practice for Preparing Precision Statements for Stan-
materials under controlled conditions and their ability to
dards Related to Rubber and Rubber Testing (Withdrawn
3 maintain a given compressive stress as a function of time. A
1987)
portion of the torque loss on the bolted flange is a result of
F104Classification System for Nonmetallic Gasket Materi-
creep relaxation. Torque loss can also be caused by elongation
als
of the bolts, distortion of the flanges, and vibration; therefore,
the results obtained should be correlated with field results.
1
These test methods are under the jurisdiction of ASTM Committee F03 on
These test methods may be used as a routine test when agreed
Gaskets and are the direct responsibility of Subcommittee F03.20 on Mechanical
upon between the consumer and the producer.
Test Methods.
Current edition approved Oct. 1, 2006. Published December 2006. Originally
approved in 1962. Last previous edition approved in 2000 as F38–00. DOI:
10.1520/F0038-00R06.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or AprintofthisapparatusisavailableatanominalcostfromASTMInternational
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Headquarters. OrderAdjunct No. ADJF003801. Original adjunct produced in 1965.
Standards volume information, refer to the standard’s Document Summary page on
5
the ASTM website. Detailed working drawings of this apparatus are available from ASTM
3
The last approved version of this historical standard is referenced on International Headquarters. Order Adjunct No. ADJF003802. Original adjunct
www.astm.org. produced in 1965.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F38 − 00 (2006)
FIG. 1 Relaxometer, Test Method A
NOTE1—TestMethodBwasdevelopedusingasbestosgasketmaterials
6.2.1 Specimen size shall be 10.16 6 0.381 mm (0.400 6
and at issuance substantiating data were not available for other gasket
0.015in.)wideby
...