1、Designation: D 1933 03Standard Specification forNitrogen Gas as an Electrical Insulating Material1This standard is issued under the fixed designation D 1933; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers three types of nitrogen used asan electrical insulating material in electrical equipment:1.1.1 Type I, o
3、btained from the air by liquefaction processesand dried,1.1.2 Type II, obtained from the air by liquefaction pro-cesses, deoxidized with hydrogen over a platinum catalyst, anddried, and1.1.3 Type III, obtained from the air by liquefaction pro-cesses and if necessary deoxidized by suitable means.NOTE
4、 1The fact that metal containers are filled with materialsmeeting this specification does not exclude the possibility that thematerials might become contaminated with unlisted impurities.1.2 The following safety hazards caveat pertains only to thetest method portion, Section 5, of this specification
5、: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Docume
6、nts2.1 ASTM Standards:2D 2029 Test Methods for Water Vapor Content of ElectricalInsulating Gases by Measurement of Dew PointE 105 Practice for Probability Sampling of MaterialsE 260 Practice for Packed Column Gas Chromatography3. Composition and Properties3.1 Samples extracted from nitrogen containe
7、rs shall con-form to the requirements prescribed in Table 1.4. Sampling4.1 Nitrogen Shipped as a Gas in High-Pressure MetalContainersExtract test specimens from the container orcontainers, preferably by means of a dual-stage high-pressuregas regulator, capable of reducing inlet gas pressures of 15MP
8、a (2200 psi) to a constant low discharge pressure. Screw thepressure regulator inlet connection on to the container valveoutlet. Connect the regulator outlet connection to the gassampling pipe or to the gas analyzing equipment by means ofmetal or glass tubing, except that rubber tubing may be used t
9、osecure butt joints in metal-to-glass or glass-to-glass tubing.Take care to ensure that all tubing is clean and dry and thesampling apparatus is thoroughly purged of atmospheric gasesbefore the test specimen is taken. Where a multiplicity ofcylinders are to be sampled, follow Practice E 105 if it is
10、considered satisfactory to sample less than the total number ofcontainers.4.2 Nitrogen Shipped as a Liquid in Metal Containers andUsed as a GasUse the same sampling procedure as that fornitrogen shipped as a gas in high-pressure metal containerswith the following exception: Extract gas samples from
11、thecontainer or containers preferably by means of a single-stagegas regulator capable of reducing inlet gas pressures of 1.7MPa (250 psi) to a constant low discharge pressure.5. Test Methods5.1 Determine the properties enumerated in this specifica-tion in accordance with the following methods:5.1.1
12、Nitrogen and Rare GasesCalculate by differenceafter oxygen and hydrogen values are known.5.1.2 HydrogenPractice E 260. Determine the hydrogencontent by methods mutually agreed upon between the pur-chaser and the supplier or by Practice E 260.5.1.3 OxygenPractice E 260 or by methods mutuallyagreed up
13、on between the purchaser and the supplier.5.1.4 Dew PointTest Methods D 2029.6. Shipping6.1 Package nitrogen in metal containers that comply withthe requirements of, and are approved by the Department of1This specification is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liqui
14、ds and Gases and is the direct responsibility of Subcom-mittee D27.02 on Gases and Synthetic Liquids.Current edition approved Oct. 1, 2003. Published December 2003. Originallyapproved in 1962. Last previous edition approved in 1997 as D1933 97.2For referenced ASTM standards, visit the ASTM website,
15、www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Composition and Properties for NitrogenType I Type II Type IIINitrogen and rare gases, min,volume %99.8 98.99
16、8 99.993Hydrogen, max, volume % 0.0 1.0 0.005Oxygen, max, volume % 0.2 0.002 0.002Dew point, max, C 55 55 591Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Transportation. Ensure the inside of the cylinder is dry and freefrom oil and
17、 corrosive chemicals.7. Keywords7.1 electrical insulating material; nitrogen gas; oxygen gasASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determinatio
18、n of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdra
19、wn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your c
20、omments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 1933 032
