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ASTM E295-82(2019)

(Test Method)

Standard Test Method for Measured Speed of Oil Diffusion Pumps

Standard Test Method for Measured Speed of Oil Diffusion Pumps

ABSTRACT
This test method establishes the apparatuses required, calibration and precision of the devices to be used, and the standard procedures for determining the measured speed, or volumetric flow rate, of oil diffusion pumps. This method shall make use of test dome, gage attachment or connecting line, flow-measuring devices, and leak control valve. The pump under test shall be fitted with a test dome of specified design. Gas is then admitted to the test dome in a specified manner at a measured rate, and the resulting change in equilibrium pressure is measured in the specified way.
SCOPE
1.1 This test method covers the determination of the measured speed (volumetric flow rate) of oil diffusion pumps.  
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
Published
Publication Date
30-Sep-2019
ICS
23.080 - Pumps
Technical Committee
E21 - Space Simulation and Applications of Space Technology
Drafting Committee
E21.04 - Space Simulation Test Methods
Current Stage
Ref Project

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ASTM E295-82(2019) - Standard Test Method for Measured Speed of Oil Diffusion PumpsASTM E295-82(2019) - Standard Test Method for Measured Speed of Oil Diffusion Pumps
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ASTM E295-82(2019) - Standard Test Method for Measured Speed of Oil Diffusion Pumps
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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.
Designation: E295 − 82 (Reapproved 2019)
Standard Test Method for
1
Measured Speed of Oil Diffusion Pumps
This standard is issued under the fixed designation E295; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope specified manner at a measured rate, and the resulting change
in equilibrium pressure is measured in a specified way.
1.1 This test method covers the determination of the mea-
sured speed (volumetric flow rate) of oil diffusion pumps.
5. Apparatus
1.2 The values stated in inch-pound units are to be regarded
5.1 Test Dome—The test dome (Fig. 1) may be constructed
as standard. The values given in parentheses are mathematical
byanymaterialandbyanymethodacceptableinhigh-vacuum
conversions to SI units that are provided for information only
practice, and will normally be connected to the pump by the
and are not considered standard.
method provided for in the design of the pump. The inside
1.3 This standard does not purport to address all of the
diameter of the test dome shall be equal to that of the pump
safety concerns, if any, associated with its use. It is the
inlet,anditsmeanheightshallbe1.5timesthisdiameter(Note
responsibility of the user of this standard to establish appro-
1).Thegasshallbeadmittedthroughatubeprojectingintothe
priate safety, health, and environmental practices and deter-
dome and bent upward so that its exit is located on the axis,
mine the applicability of regulatory limitations prior to use.
facing away from the pump inlet port, and at a distance from
1.4 This international standard was developed in accor-
the pump inlet equal to the dome diameter. The opening to the
dance with internationally recognized principles on standard-
vacuum gage shall be through a tube radially projecting into
ization established in the Decision on Principles for the
the test dome. The tubulation center line shall be above the
Development of International Standards, Guides and Recom-
1
inlet flange, 1 in. (25 mm) or ⁄4 D above the top of the flange,
mendations issued by the World Trade Organization Technical
whichever is larger (see Fig. 1).
Barriers to Trade (TBT) Committee.
NOTE 1—A10° slope of the dome roof is required only if the dome is
2. Referenced Documents
to be used for back-streaming measurements.
2
2.1 ASTM Standards: 5.2 Gage Attachment—The gage connecting line shall be
3
E297Test Method for Calibrating Ionization Vacuum Gage
less than 6 in. (152 mm) long and at least ⁄4 in. (19 mm) in
3
Tubes (Withdrawn 1983) inside diameter; shall contain one right-angle bend upward to
1
the gage; and shall project ⁄8 in. (3.2 mm) into the test dome.
3. Terminology
If a McLeod gage is used, it shall be attached in a similar
3.1 measured speed—the mass flow rate of gas admitted
manner, except that the connecting line, including a mercury
from a flowmeter divided by the resulting increase in equilib-
vapor trap, need not meet the dimensional restrictions above.
rium static pressure near the inlet of the pump, using the
Theuseofgrease,wax,andrubberinassemblingthegagelines
equipment in Fig. 1.
should be minimized.
4. Summary of Test Method 5.3 Flow-Measuring Devices:
−4
5.3.1 For flows greater than about 5×10 torr L/s (that is,
4.1 The pump under test is fitted with a test dome of
3
about25min/atmosphericcm ),anduptoapproximately5torr
specified design (Fig. 1). Gas is admitted to the test dome in a
3
L/s (that is, about 15 s/100 atmospheric cm ), some type of
constant-pressure displacement tube with low-vapor pressure
1
This test method is under the jurisdiction of the ASTM Committee E21 on
fluid shall be used. These tubes should be provided in a series
Space Simulation and Applications of Space Technology and is the direct respon-
sibility of Subcommittee E21.04 on Space Simulation Test Methods.
of overlapping ranges so that very small through-puts may be
Current edition approved Oct. 1, 2019. Published October 2019. Originally
measured in a reasonably short time and that very large
approvedin1967.Lastpreviouseditionapprovedin2014asE295–82(2014).DOI:
through-puts may be measured in a time interval long enough
10.1520/E0295-82R19.
2
to allow precise measurement.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
−4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3.2 Flow rates less than about 5×10 torr L/s may be
Standards volume information, refer to the standard’s Document Summary page on
determined
...

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1.7 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 s...

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