ASTM_D_1550_-_94_2015.pdf

Designation:D155094(Reapproved 2015)StandardASTM Butadiene Measurement Tables1This standard is issued under the fixed designation D1550;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 The ASTM Butadiene Measurement Tables are for usein the calculation of quantities of butadiene.The accompany-ing Tables 1-4 cover the normal operating ranges for thereduction of observed specific gravity and volume to 15.6/15.6 C(60/60 F)and for the calculation of weight-volumerelationships of butadiene.1.2 These tables are applicable to both butadiene andbutadiene concentrates(minimum of 60%butadiene).NOTE1These tables replace the existing tables in the NationalInstitute of Standards and Technology Letter Circulars LC-736 andLC-757 and the Rubber Reserve Corp.,Butadiene Laboratory Manual.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:2D1250 Guide for Use of the Petroleum Measurement Tables3.Significance and Use3.1 Accurate knowledge of the weight and volume ofbutadiene is necessary for the orderly manufacture,storage,transfer,and sale of the material.These tables are suitable foruse in these and similar aspects of butadiene commerce.TABLE 1 REDUCTION OF OBSERVED SPECIFIC GRAVITY TO SPECIFIC GRAVITY 15.6/15.6 C(60/60 F)This table gives values of specific gravity 15.6/15.6 C(60/60 F)corresponding to specific gravities observed with a glass hydrometer at temperatures other than60 F.The expression“Observed Specific Gravity”appears in this table because it is the term most generally used in industry.For specific gravities determined byhydrometer,a more exact expression would be“hydrometer indication at the observed temperature.”This hydrometer indication differs slightly from the true specificgravity at the observed temperature owing to the expansion or contraction of the glass hydrometer when its temperature differs from its calibration temperature of60 F.It is generally impracticable to determine a specific gravity at exactly 15.6 C(60 F)although it is at this temperature only that strictly correct results are obtainedwith a standard glass hydrometer.In converting an observed specific gravity at the observed temperature t F(hydrometer indication of specific gravity t/60 F)to thecorresponding 60/60 F value,two corrections are possible.The first arises from the change in volume of the glass hydrometer with temperature,and the secondarises from the change in volume of the butadiene.This table takes into account only the change in volume of the butadiene because the change in volume of thehydrometer is insignificant in comparison with the accuracy of the values for the change in volume of the butadiene.This table must be entered with specific gravities measured with a glass hydrometer calibrated at 15.6/15.6 C(60/60 F)ExampleIf the specific gravity observed on a hydrometer in butadiene at 40 F is 0.642,what is its specific gravity 60/60 F?Enter the table in the column for“Observed Specific Gravity,”headed 0.640,and note that against an“Observed Temperature”of 40 F,the correspondingspecific gravity 60/60 F is0.627Likewise,note that for 0.645 specific gravity opposite 40 F,the corresponding specific gravity 60/60 F is0.632This represents an increase of 0.005 in specific gravity 60/60 F for an increase of 0.005 in the value at 40 F.Therefore,by simple proportion,an increasein the specific gravity value noted at 40 F from 0.640 to 0.642 increases the corresponding specific gravity 60/60 F by 0.4 0.005 or0.002Then,the specific gravity 60/60 F corresponding to the observed specific gravity of 0.642 at 40 F is 0.627+0.002 or0.6291These tables are under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and are the direct responsibility ofSubcommittee D02.02.07 on Temperature Determination(API MPMS Chapter 7.0).Current edition approved Oct.1,2015.Published December 2015.Originallyapproved in 1958.Last previous edition approved in 2009 as D1550 94(2009).DOI:10.1520/D1550-94R15.2For 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 TABLE 1 Reduction of Observed Specific Gravity to Specific Gravity 15.6/15.6C(60/60F)18.343.0 C(65110 F)0.5850.615ObservedTemperatureFAObserved Specific Gravity0.5850.5900.