ASTM F145-72(1997)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: F 145 – 72 (Reapproved 1997)
Standard Practice for
Evaluating Flat-Faced Gasketed Joint Assemblies
This standard is issued under the fixed designation F 145; 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.
1. Scope facing between bolt centers can be measured; however, in a
few highly distortable flanges the maximum bending between
1.1 This practice permits measurement of gasket compres-
bolt centers may not be detected.
sion resulting from bolt loading on a flat-face joint assembly at
4.2 The variation in gasket compressions at selected points
ambient conditions.
in a flat-face joint assembly reveals the degree of flange
1.2 The values stated in SI units are to be regarded as the
distortion or the ability of the flange to distribute satisfactorily
standard. The values given in parentheses are for information
the compressive forces from bolt loads throughout the gasket.
only.
1.3 This standard does not purport to address all of the
5. Apparatus (see Fig. 1)
safety concerns, if any, associated with its use. It is the
5.1 Test Assembly, any flat-face flange design.
responsibility of the user of this standard to establish appro-
5.2 Torque Indicating Device, for bolt loading.
priate safety and health practices and determine the applica-
5.3 Dial Gage Indicator, graduated in 0.00254 mm (0.0001
bility of regulatory limitations prior to use.
in.) to measure thickness of the solder plugs and the uncom-
2. Referenced Documents pressed gasket.
5.4 Leather Punch, for punching holes in the gasket and
2.1 ASTM Standards:
fabricating the solder plugs.
E 171 Specification for Standard Atmospheres for Condi-
2 5.5 Tweezers, to conveniently handle the solder plugs.
tioning and Testing Materials
5.6 Solder Plugs— The solder must be made into a flat strip.
3. Summary of Practice This can be done by compressing wire in a vise, a pair of
flanges, pliers, or passing it between two calender rolls. The
3.1 The gasket compression and flange distortion are ob-
solder plugs are punched from the strip by means of the leather
tained from compressed-thickness measurements on cylindri-
punch. Recommended plug diameter is 0.8 mm ( ⁄32 in.) and
cally shaped soft-solder plugs (50-50 lead-tin by weight)
the height need only be such that the plug is compressed by the
inserted into holes, drilled or punched through the gasket in the
flanges when the gasket is also compressed. The initial
thickness direction. Initial compression is accomplished in the
thickness of the plug and gasket before compression need not
flanged-joint assembly when the bolts are loaded at ambient
be equal.
temperature. Solder, being inelastic, will remain at the com-
pressed thickness of the gasket after the joint is subsequently
6. Test Specimens
disassembled.
6.1 Three gasket specimens shall be tested. The size and
4. Significance and Use
shape of the specimens must be such as to fit the particular
flange design.
4.1 Gasket compressions produced by bolt loads in a
flanged joint are important in the application engineering of a
7. Conditioning
joint assembly. They are related to the ability of a gasket to
7.1 When the test is performed on an assembly line or in a
seal, to maintain tightness on assembly bolts, and to a variety
service environment, sufficient time should elapse for the
of other gasket properties that determine the service behavior
flanges, bolts, and gasket to reach equilibrium with the ambient
of a joint assembly. Thus, being able to determine the degree of
temperature and humidity conditions before assembly. (Heavy
compression in a gasket under the bolt loading will permit one
castings or forgings may require 8 to 24 h or more, contrasted
to make qualitative predictions of the behavior of a joint
to a brief period for light stampings.)
assembly when it comes in contact with the application or
7.2 When the test is performed under controlled conditions
service environment. With the plug test, bending of a flange
in the laboratory the gasket specimen is conditioned in accor-
dance with Specification E 171, or in the humidity and tem-
This practice is under the jurisdiction of ASTM Committee F-3 on Gaskets, and
perature conditions used prior to obtaining the load-
is the direct responsibility of Subcommittee F03.20 on Methods of Test.
compression curve. Flange fasteners and washers are held at
Current edition approved Jan. 4, 1972. Published February 1972.
2 the test conditions for at least 4 h prior to assembly.
Annual Book of ASTM Standards, Vol 15.09.
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