ASTM D2472-00
(Specification)Standard Specification for Sulfur Hexafluoride
Standard Specification for Sulfur Hexafluoride
SCOPE
1.1 This specification applies to sulfur hexafluoride for use as an electrical insulating gas. Note 1-This specification is intended to apply only to gas as purchased. However, the test methods referred to in this standard may be useful in the evaluation of in-service or used gas. Test Method D2284 may be particularly helpful since many sulfur hexafluoride decomposition products are acidic. Test Method D2284 should not be used to evaluate the total amount of sulfur hexafluoride decomposition nor to identify contaminant species. This can only be done by gas chromatography and similar instrumental techniques.
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Designation: D 2472 – 00
Standard Specification for
Sulfur Hexafluoride
This standard is issued under the fixed designation D 2472; 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.
A
TABLE 1 Detail Requirements for Sulfur Hexafluoride
1. Scope
Requirements Property
1.1 This specification applies to sulfur hexafluoride for use
as an electrical insulating gas.
B
Water content, max dew point, °C −62
NOTE 1—This specification is intended to apply only to gas as pur- Hydrolyzable fluorides, expressed as HF 0.3
acidity, max, ppm by weight
chased. However, the test methods referred to in this standard may be
Air, expressed as N , max, weight % 0.05
useful in the evaluation of in-service or used gas. Test Method D 2284
Carbon tetrafluoride, max, weight % 0.05
may be particularly helpful since many sulfur hexafluoride decomposition
Assay, min, weight % 99.8
products are acidic. Test Method D 2284 should not be used to evaluate
A
By agreement between the purchaser and the manufacturer, analysis may be
the total amount of sulfur hexafluoride decomposition nor to identify
required and limits established for properties, elements, or compounds not
contaminant species. This can only be done by gas chromatography and
specified in the table of requirements.
B 5
similar instrumental techniques.
Corresponds to a water content of 8.0 ppm by volume at 1.01325 3 10 Pa.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
for sampling to ensure that the sample is obtained from the
responsibility of the user of this standard to establish appro-
liquid phase of the cylinder.
priate safety and health practices and determine the applica-
4.3 Analyses may be performed on vapor space samples for
bility of regulatory limitations prior to use.
routine or preliminary testing. If the vapor phase analysis
indicates that impurities are not within specification, a liquid
2. Referenced Documents
phase sample should be obtained and analysed. The liquid
2.1 ASTM Standards:
phase comprises most of the material in the container and is
D 2029 Test Methods for Water Vapor Content of Electrical
morerepresentativeoftheoverallcompositionoftheSF inthe
Insulating Gases by Measurement of Dew Point
2 container. When a discrepancy exists between vapor and liquid
D 2284 Test Method for Acidity of Sulfur Hexafluoride
phase analyses, the liquid phase analysis shall govern, unless
D 2685 Test Method for Air and Carbon Tetrafluoride in
2 otherwise agreed to by purchaser-seller agreement.
Sulfur Hexafluoride by Gas Chromatography
5. Precautions
3. Detail Requi
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