ASTM_D_1933_-_03_2008.pdf

Designation:D193303(Reapproved 2008)Standard Specification forNitrogen Gas as an Electrical Insulating Material1This standard is issued under the fixed designation D1933;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()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,obtained 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.NOTE1The 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: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 Documents2.1 ASTM Standards:2D2029 Test Methods for Water Vapor Content of ElectricalInsulating Gases by Measurement of Dew PointE105 Practice for Probability Sampling of MaterialsE260 Practice for Packed Column Gas Chromatography3.Composition and Properties3.1 Samples extracted from nitrogen containers 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 15MPa(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 tosecure 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 E105 if it isconsidered 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 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 Nitrogen and Rare GasesCalculate by differenceafter oxygen and hydrogen values are known.5.1.2 HydrogenPractice E260.Determine the hydrogencontent by methods mutually agreed upon between the pur-chaser and the supplier or by Practice E260.5.1.3 OxygenPractice E260 or by methods mutuallyagreed upon between the purchaser and the supplier.5.1.4 Dew PointTest Methods D2029.6.Shipping6.1 Package nitrogen in metal containers that comply withthe requirements of,and are approved by the Department ofTransportation.Ensure the inside of the cylinder is dry and freefrom oil and corrosive chemicals.7.Keywords7.1 electrical insulating material;nitrogen gas;oxygen gas1This specification is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gasesand is the direct responsibility of Subcom-mittee D27.02 on Gases and Non-Mineral Oil Liquids.Current edition approved May 1,2008.Published June 2008.Originallyapproved in 1962.Last previous edition approved in 2003 as D1933 03.DOI:10.1520/D1933-03R08.2For referenced ASTM standards,visit the ASTM website,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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 ASTM 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 determination 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 re