ASTM E677-94(2004)
(Specification)Standard Specification for Interchangeable Spherical Ground Joints
Standard Specification for Interchangeable Spherical Ground Joints
ABSTRACT
This specification covers standard dimensional requirements for obtaining interchangeable spherical ground joints. This specification does not include physical, chemical, and design characteristics of material used. Dimensional requirements include socket member design, ball member design, size designation, dimensions, and interchangeability. Ground joints shall be tested for ball and socket dimensions and leakage. Leak rate shall be calculated based on change in differential pressure, evacuated volume and time of test.
SCOPE
1.1 This specification provides standard dimensional requirements for obtaining, within practical limits, interchangeability in spherical ground joints for ordinary laboratory and industrial applications. It covers dimensional interchangeability of the ground surfaces only and does not involve design characteristics of the item except where specified, nor does it involve physical or chemical characteristics of the material used.
Note 1--The dimensions pertaining to spherical ground joints were taken from the Commercial Standard CS 21-58 of the U.S. Department of Commerce.
Note 2--Although glass is the most commonly used material for ground joints, other materials may be used as specified. Spherical joints constructed from glass shall conform to Specifications E438 and E671.
1.2 The following precautionary caveat pertains only to the Test Method portion, Section 4, of this specification. 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.
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Designation: E677 – 94 (Reapproved 2004)
Standard Specification for
Interchangeable Spherical Ground Joints
This standard is issued under the fixed designation E677; 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.
1. Scope Laboratory Glassware
2.2 U.S. Department of Commerce Standard:
1.1 This specification covers standard dimensional require-
CS-21 Interchangeable Taper-Ground Joints, Stopcocks,
ments for obtaining, within practical limits, interchangeability
Stoppers, and Spherical-Ground Joints
insphericalgroundjointsforordinarylaboratoryandindustrial
applications. It covers dimensional interchangeability of the
3. Requirements
ground surfaces only and does not involve design characteris-
3.1 Socket Member—The design of the socket member is
tics of the item except where specified, nor does it involve
shown in Fig. 1. The contour of the ground area shall be
physical or chemical characteristics of the material used.
spherical, with a radius of curvature equal to one half of the
NOTE 1—The dimensions pertaining to spherical ground joints were
gaging ball diameter specified in Table 1 as a minimum. The
taken from the Commercial Standard CS 21–58 of the U.S. Department of
contour of the shoulder shall be essentially spherical and
Commerce.
concentric with the ground area. When tested in accordance
NOTE 2—Although glass is the most commonly used material for
with 4.2, socket members shall show a continuous circumfer-
ground joints, other materials may be used as specified. Spherical joints
ential line of contact with the gaging ball.
constructed from glass shall conform to Specifications E438 and E671.
3.2 Ball Member—The design of the ball member is shown
1.2 The following precautionary caveat pertains only to the
in Fig. 1. The contour of the ground area shall be spherical,
Test Method portion, Section 4, of this specification. This
with a radius of curvature equal to one half of the gaging ball
standarddoesnotpurporttoaddressallofthesafetyconcerns,
diameter as specified in Table 1 as a maximum. The contour of
ifany,associatedwithitsuse.Itistheresponsibilityoftheuser
the shoulder shall be essentially spherical, approximately
of this standard to establish appropriate safety and health
concentric with the ground area and with a slightly smaller
practices and determine the applicability of regulatory limita-
radius to provide a short offset at or slightly beyond the line of
tions prior to use.
the gaging diameter. Ball members shall meet the reduced
pressure test (4.3) when assembled with a socket member
2. Referenced Documents
complying with 3.1.
2.1 ASTM Standards:
3.3 Size Designation—The size designation of joints shall
E438 Specification for Glasses in Laboratory Apparatus
be the accepted nominal gaging diameter, plus the inside
E671 Specification for Maximum Permissible Thermal Re-
diameter of the joint within the ball member, both expressed in
sidual Stress in Annealed Glass Laboratory Apparatus
millimetres and separated by a line. Therefore, the designation
E920 Specification for Commercially Packaged Laboratory
18/7 means that the nominal gaging diameter of the joint is 18
Apparatus
mm and the inside diameter of the joint is 7 mm.
E921 Specification for Export Packaged Laboratory Appa-
3.4 Dimensions—The size designations and essential di-
ratus
mensions of joints are shown in Table 1. Only the sizes listed
E1133 Practice for Performance Testing of Packaged Labo-
shall be considered standard.
ratory Apparatus for United States Government Procure-
3.5 Interchangeability—When assembled ball-and-socket
ments
members are paired at random and tested under reduced
E1157 Specification for Sampling and Testing of Reusable
pressure, the leak rates shall not exceed those specified in 4.3.
4. Test Methods
This specification is under the jurisdiction of ASTM Committee E41 on
Laboratory Apparatus and is the direct responsibility of Subcommittee E41.01 on
4.1 Gaging the Ball—Gaging balls shall have dimensions
Apparatus.
and tolerances shown in Table 1.
Current edition approved May 1, 2004. Published May 2004. Originally approved
4.2 Gaging the Socket—Sockets shall be tested against a
in 1980. Last previous edition approved in 1998 as E677 – 94 (1998). DOI:
10.1520/E0677-94R04.
gaging ball. The ball shall enter the socket and the line of
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Discontinued 1979—U.S. Department of Commerce, Washington, DC 20234.
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E677 – 94 (2004)
FIG. 1 Diagram of Ball-and-Socket Members
TABLE 1 Spherical Ground Joints
Nominal Dimension
Gaging Ball
Joint Size Gaging D
Diameter,
Designation Diame
...
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