ASTM_D_1275_-_15.pdf

Designation:D127515315/98Standard Test Method forCorrosive Sulfur in Electrical Insulating Liquids1This standard is issued under the fixed designation D1275;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.This standard has been adopted for use by government agencies to replace Method 5328-2 of Federal Test Method Standard No.791b.This standard was adopted as an ASTM-IP Standard.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONPrior to 2006,this test method existed as a singular method in which the main aging parameters ofthe test specimen were 19 h at 140C.In 2006,it was determined that those parameters wereinadequate(not sensitive enough to detect all levels of corrosive sulfur)and Method B was institutedin which the main aging parameters were 48 h at 150C.The old parameters were kept as Method Ato avoid any confusion.The current edition of this test method for the copper corrosion procedurereverts back to a singular method in which the main aging parameters are the same as the previousMethod B(2006-2014).Results from the current test method cannot be compared or correlated to themethod prior to 2006 and only to Method B from 2006 to 2014.1.Scope1.1 This test method describes the detection of corrosivesulfur compounds(both inorganic and organic)in electricalinsulating liquids.1.2 New and in-service insulating liquids may containelemental sulfur or sulfur compounds,or both,that causecorrosion under certain conditions of use.This test method isdesigned to detect the presence of,or the propensity to form,free(elemental)sulfur and corrosive sulfur compounds bysubjecting copper or silver to contact with an insulating liquidunder prescribed conditions.1.3 The values stated in SI units are to be regarded as thestandard.Inch-pound units are included for informationalpurposes.1.4 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D130 Test Method for Corrosiveness to Copper from Petro-leum Products by Copper Strip TestD923 Practices for Sampling Electrical Insulating LiquidsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 Other Document:ANSI B74.10 Grading of Abrasive Microgrits3DIN 51 353 Testing of Insulating Oils;detection of corrosivesulfur,silver strip test43.Significance and Use3.1 In most of their uses,insulating liquids are continuallyin contact with metals that are subject to corrosion.Thepresence of elemental sulfur or corrosive sulfur compoundswill result in deterioration of these metals and cause conductiveor high resistive films to form.The extent of deterioration isdependent upon the quantity and type of corrosive agent and1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.06 on Chemical Test.Current edition approved Nov.15,2015.Published January 2016.Originallyapproved in 1953.Last previous edition approved in 2006 as D1275 06 which waswithdrawn January 2015 and reinstated in December 2015.DOI:10.1520/D1275-15.2For 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.3Available from American National Standards Institute,25 W.43rd St.,4thFloor,New York,NY 10036,USA.4Available from Deutsches Institut fr Normung e.V.(DIN),Am DIN-Platz,Burggrafenstrasse 6,10787 Berlin,Germany,http:/www.din.de or http:/www.bleuth.deCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 time and temperature factors.Detection of these undesirableimpurities,even though not in terms of quantitative values,isa means for recognizing the hazard involved.3.2 Two methods are provided,one for copper corrosion andone for silver corrosion.Copper is slightly less sensitive tosulfur corrosion than silver but the results are easier to interpretand less prone to error.The silver corrosion procedure isprovided especially for those users who have applicationswhere the insulating liquid is in contact with a silver surface.4.Apparatus4.1 BathA hot-air oven or liquid bath provided withsuitable means of heating to,and controlling at 140 or 150 62C.A circulating hot-air oven is preferred.4.2 Bottles5Heavy-walled,250-mL,bottles of chemicallyresistant glass constructed with necks to receive a polytetra-fluoroethylene(PTFE)threaded plug equipped with a