ASTM D1933-97

Standard Specification for Nitrogen Gas as an Electrical Insulating Material

SCOPE
1.1 This specification covers three types of nitrogen used as an electrical insulating material in electrical equipment:  
1.1.1 Type I , obtained from the air by liquefaction processes and dried,  
1.1.2 Type II , obtained from the air by liquefaction processes, deoxidized with hydrogen over a platinum catalyst, and dried, and  
1.1.3 Type III , obtained from the air by liquefaction processes and if necessary deoxidized by suitable means.  
Note-The fact that metal containers are filled with materials meeting this specification does not exclude the possibility that the materials might become contaminated with unlisted impurities.
1.2 The following safety hazards caveat pertains only to the test method portion, Section 5, 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.

General Information

• Status: Historical
• Publication Date: 09-Apr-1997
• ICS: 29.040.20 - Insulating gases
• Technical Committee: D27 - Electrical Insulating Liquids and Gases
• Drafting Committee: D27.02 - Gases and Non-Mineral Oil Liquids

Relations

• Replaced By: ASTM D1933-03 - Standard Specification for Nitrogen Gas as an Electrical Insulating Material
• Effective Date: 01-Oct-2003
• Referred By: ASTM D7150-13(2020) - Standard Test Method for the Determination of Gassing Characteristics of Insulating Liquids Under Thermal Stress
• Effective Date: 10-Apr-1997
• Referred By: ASTM D5282-05(2020) - Standard Test Methods for Compatibility of Construction Material with Silicone Fluid Used for Electrical Insulation
• Effective Date: 10-Apr-1997
• Referred By: ASTM D923-15 - Standard Practices for Sampling Electrical Insulating Liquids
• Effective Date: 10-Apr-1997
• Referred By: ASTM D2413-16(2022) - Standard Practice for Preparation of Insulating Paper and Board Impregnated with a Liquid Dielectric
• Effective Date: 10-Apr-1997
• Referred By: ASTM D2029-97(2017) - Standard Test Methods for Water Vapor Content of Electrical Insulating Gases by Measurement of Dew Point
• Effective Date: 10-Apr-1997

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 1933 – 97
Standard Specification for
1
Nitrogen Gas as an Electrical Insulating Material
This standard is issued under the fixed designation D 1933; 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.
TABLE 1 Composition and Properties for Nitrogen
1. Scope
Type I Type II Type III
1.1 This specification covers three types of nitrogen used as
Nitrogen and rare gases, min, 99.8 98.998 99.993
an electrical insulating material in electrical equipment:
volume %
1.1.1 Type I, obtained from the air by liquefaction processes
Hydrogen, max, volume % 0.0 1.0 0.005
and dried,
Oxygen, max, volume % 0.2 0.002 0.002
Dew point, max, °C −55 −55 −59
1.1.2 Type II, obtained from the air by liquefaction pro-
cesses, deoxidized with hydrogen over a platinum catalyst, and
dried, and
psi (15 MPa) to a constant low discharge pressure. Screw the
1.1.3 Type III, obtained from the air by liquefaction pro-
pressure regulator inlet connection on to the container valve
cesses and if necessary deoxidized by suitable means.
outlet. Connect the regulator outlet connection to the gas
NOTE 1—The fact that metal containers are filled with materials
sampling pipe or to the gas analyzing equipment by means of
meeting this specification does not exclude the possibility that the
metal or glass tubing, except that rubber tubing may be used to
materials might become contaminated with unlisted impurities.
secure butt joints in metal-to-glass or glass-to-glass tubing.
1.2 The following safety hazards caveat pertains only to the
Take care to ensure that all tubing is clean and dry and the
test method portion, Section 5, of this specification: This
sampling apparatus is thoroughly purged of atmospheric gases
standard does not purport to address all of the safety concerns,
before the test specimen is taken. Where a multiplicity of
if any, associated with its use. It is the responsibility of the user
cylinders are to be sampled, follow Practice E 105 if it is
of this standard to establish appropriate safety and health
considered satisfactory to sample less than the total number of
practices and determine the applicability of regulatory limita-
containers.
tions prior to use.
4.2 Nitrogen Shipped as a Liquid in Metal Containers and
Used as a Gas—Use the same sampling procedure as that for
2. Referenced Documents
nitrogen shipped as a gas in high-pressure metal containers
2.1 ASTM Standards:
with the following exception: Extract gas samples from the
D 2029 Test Methods for Water Vapor Content of Electrical
container or containers preferably by means of a single-stage
2
Insulating Gases by Measurement of Dew Point
gas regulator capable of reducing inlet gas pressures of 250 psi
3
E 105 Practice for Probability Sampling of Materials
(1.7 MPa) to a constant low discharge pressure.
3
E 260 Practice for Packed Column Gas Chromatography
5. Test Methods
3. Composition and Properties
5
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