ASTM_D_3613_-_98.pdf

Designation:D 3613 98Standard Practice forSampling Insulating Liquids for Gas Analysis andDetermination of Water Content1This standard is issued under the fixed designation D 3613;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers sampling electrical insulating liq-uids having a viscosity less than 650 cSt at 40C fromapparatus for analysis of their gas content or for measurementof water content,or both.Guide D 117,Test Methods D 1533,and Test Methods D 3612 provide detailed information regard-ing gas and water testing.Definitions of terms used in thispractice may be found in Terminology D 2864.1.2 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.Specific precau-tionary statements are given in Sections 6 and 7.2.Referenced Documents2.1 ASTM Standards:D 117 Guide to Test Methods and Specifications for Elec-trical Insulating Oils of Petroleum Origin2D 923 Test Methods for Sampling Electrical InsulatingLiquids2D 1533 Test Methods for Water in Insulating Liquids2D 2864 Terminology Relating to Electrical Insulating Liq-uids and Gases2D 3612 Test Method for Analysis of Gases Dissolved inElectrical Insulating Oils by Gas Chromatography23.Significance and Use3.1 A study of gases and moisture contained in insulatingoils from transformers and other electrical power apparatus canfrequently give an early indication of abnormal behavior of theapparatus,and may indicate appropriate action be taken on theequipment before it suffers greater damage.Specific gas andmoisture content can be determined from oil samples for thispurpose.Care must be taken in drawing samples to preventcontamination and to ensure a truly representative sample.4.Apparatus4.1 Sample Containers,may be glass syringes,stainlesssteel cylinders,or metal cans having flexible sides(to allow forvolume changes caused by expansion or contraction of the oil).4.1.1 Glass Syringes,of a suitable size terminated with aluer lock fitting to which is attached a three-way stopcock,should be used.Syringes having precision ground barrels andpistons are preferred.4.1.2 Stainless Steel Sampling Cylinders,equipped withvalves on each end may be used for sampling.These cylindershave the disadvantage of not allowing visual inspection of theinterior of the cylinder.4.1.3 Flexible-Sided Metal Cans,having screw caps mayalso be used.4.2 Flush Oil Containerof at least 3.8 L(1 gal)to containthe required flush liquid during preparation and sampling.4.3 Clear Poly(Vinyl-Chloride)Tubingor any tubing thatmeets the requirements of this practice that is oil resistant.Sizeshall be selected to guarantee a gas and liquid tight fit at thesampling port and on the syringe or steel cap.To minimizewaste and potential spills a length of 60 cm(24 in.)issuggested and has proven to be acceptable for manipulation ofthe collection container while attached to the sample port.5.Cleaning of Apparatus5.1 A proven method for cleaning sample containers andaccessories is the use of a cleaning agent that completelydissolves liquid residue,and shall then be subjected to soap andwater cleaning and water rinse followed by a distilled waterrinse.See Test Methods D 923 for further details about generalcleaning requirements.5.2 Allow the container to drain for 10 min,and dry in aforced-draft oven at 110C for not less than 1 h.When thedrying period has expired,syringe pistons shall be placed intheir barrels,valves closed;stainless steel cylinder valvesshould be closed;or cans sealed with their screw cap.It isdesirable that stainless steel cylinders be evacuated and sealedafter cleaning.5.3 The poly(vinyl chloride)tubing should be replaced withnew tubing each time a sample port is used.Cleaning thetubing should be considered impractical.5.4 Alternate Stainless Steel Cylinder Cleaning Method:5.4.1 Rinse the cylinder with a suitable volatile solvent.1This practice is under the jurisdiction of ASTM Committee D-27 on ElectricalInsulating Liquids and Gases and are the direct responsibility of SubcommitteeD27.07 on Physical Test.Current edition approved April 10,1998.Published September 1998.Originallypublished as D 3613 77.Last previous edition D 3613 92.2Annual Book of ASTM Standards,Vol 10.03.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTM5.4.2 Allow the cylinder to drain for 10 min with bothvalves full open,placing the cylinders in a vertical position.5.4.3 Dry the cylinder by passing dry air through thecylinder until the c