ASTM_D_1827_-_92_2002e1.pdf

Designation:D 1827 92(Reapproved 2002)1Standard Test Method forGas Content(Nonacidic)of Insulating Liquids byDisplacement with Carbon Dioxide1This standard is issued under the fixed designation D 1827;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.1NOTEThe mercury warning was editorially added in April 2009.1.Scope1.1 This test method describes the determination of the gascontent of electrical insulating liquids with a viscosity of 216cSt or less at 100C.Any gas that is nonreactive with a strongcaustic solution may be determined.NOTE1The test method has a bias for samples containing gases otherthan oxygen and nitrogen in atmospheric ratios due to differentialsolubility effects.Gases which react with KOH such as carbon dioxidewill not be measured.Unsaturated hydrocarbons such as acetylene,ifpresent,will react with KOH to a small degree and will result in anunderestimation of the total gas present.1.2 WarningMercury has been designated by EPA andmany state agencies as a hazardous material that can causecentral nervous system,kidney,and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury-containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAs website(http:/www.epa.gov/mercury/faq.htm)for additional informa-tion.Users should be aware that selling mercury or mercury-containing products,or both,in your state may be prohibited bystate law.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D 831 Test Method for Gas Content of Cable and CapacitorOilsD 923 Practices for Sampling Electrical Insulating LiquidsD 1193 Specification for Reagent WaterD 3613 Practice for Sampling Insulating Liquids for GasAnalysis and Determination of Water Content33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 gas content by volumeof an insulating liquid,thevolume of gas contained in a given volume of liquid.It isusually expressed as a percentage at standard atmosphericconditions of 760 mm Hg pressure and 0C temperature.3.1.2 gas content by weightthe weight of gas contained ina given weight of liquid,usually expressed in parts per million.4.Summary of Test Method4.1 This test method consists essentially of purging dis-solved gases from a small liquid test specimen with purecarbon dioxide gas.The dissolved gases are then carried into agraduated buret(precision nitrometer)filled with a potassiumhydroxide solution for a precise measurement.The carbondioxide is completely absorbed by the potassium hydroxideand the volume of other gases is measured.5.Significance and Use5.1 Electrical insulating liquids,in many applications,re-quire low gas content.This is the case with capacitors andcertain types of cable,for example.This test is used as afactory control test and as a control and functional test ininstallation and maintenance work by utilities.This test re-quires care in manipulation and trained,careful personnel.6.Apparatus(see Fig.1)6.1 Precision Nitrometer(azotometer),A,with a calibratedcapacity of 1.5 mL and calibrated in 0.01-mL divisions.Nitrometers shall have individual calibration correction tablesthat give the correct volume for each 0.01-mL point on thescale when a 40%aqueous potassium hydroxide solution isused.The gas inlet shall consist of a 12/2 socket joint.The1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.03 on Physical Tests.Current edition approved Aug.15,1992.Published October 1992.Originallypublished as D 1827 61 T.Last previous edition D 1827 84.2For 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.3Withdrawn.The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest informationnitrometer shall be provided with a liquid leveling bulb,B,of125-mL capacity.Rubber stoppers,K,with a short piece ofglass capillary tubing,should be placed in the top of thenitrometer and the leveling bulb,B,to prevent sp