1、-y ASTM D2781 BA H 0759510 OOi7207 3 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St.,Philadelphia,Pa.19103 Reprinted from the Annual Book of ASTM Standards,Copyright ASTM If not listed in the current combined index,will appear in the next edition.An American National Standard d/b Designatio
2、n:2781-88 Standard Test Method for Compatibility of Fuel Oil Blends by Spot Test This standard is issued under the fixed designation D 278 I:the number immediately following the designation indicates the year of original adoption or.in the case of revision,the year of last revision.A number in paren
3、theses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the lasf revision or reapproval.1.Scope Reference Spot Sheet(D 278 1)1.1 This test method covers two spot test procedures for rating a residual fuel oil with respect to its compatibility with a s
4、pecific distillate fuel oil.Procedure A indicates the degree of asphaltene deposition that may be expected in blending the components.This procedure is used when wax deposi-tion is not considered a fuel application problem.Procedure B indicates the degree of wax and asphaltene deposition in the mixt
5、ure at room temperature.This procedure is used when wax deposition is considered a fuel application problem.1.2 This test method is applied to a 50-50 blend of the component fuel oils where the viscosity of the blend is between approximately 15 and 45 cSt(1 cSt=1 mm2/s)at 38C(100F).3.Summary of Test
6、 Method 3.1 Procedure A-Equal volumes of the residual fuel oil and the distillate fuel oil are blended at 65C(149F).A drop of the blend is allowed to spread on chromatographic paper of a specified grade rated at 65C(149F).The spot thus formed is compared with a series of numbered reference spots.The
7、 compatibility of the components is rated on the basis of this comparison.3.2 Procedure B-This procedure is the same as Proce-dure A except the spot is developed at a temperature of 20C(68F).4.Significance and Use-NOTE 1-This blend approaches the most severe conditions for.measuring compatibility an
8、d its viscosity is in the proper range for satisfactory development of the spot under the conditions of the test.4.1 Two fuels,each of which is stable alone,when mixed together may make a fuel that is not stable.An unstable blend will contain DreciDitated material that was soluble in 1.3 This test m
9、ethod is valid for predicting the compati-bility of the two components for blending into intermediate marine diesel fuels.one of the component fiels.When the blend is unstable the fuels are incompatible.The unstable fuel will cause deposits to be formed.4.2 This test method is used as a pass/fail te
10、st method.NOTE 2-Comonents that are comDafible in fhe 50-50 test blend may not be comptible when manne diesel fuel is diluted with a higher percentage of distillate fuel oil.1.4 This standard may involve hazardous materials,oper-ations,and equipment.This standard does not purport to address all of t
11、he safety problems associated with its use.It is the responsibility o f the user o f this standard to establish appropriate safety and health practices and determine the applicability o f regulatory limitations prior to use.1.5 The value stated in SI Units are to be regarded as the standard.The valu
12、es given in parentheses are for informa-tion only.2.Referenced Documents 2.1 ASTM Standards:5.Descriptions of Terms Specific to This Standard 5.1 compatibility-the absence of suspended solids in fuel oil blends under the conditions of the test.5.2 compatibility rating-the assigned numerical value of
13、 the reference spot which most closely resembles the spot produced under the conditions of the test.5.3 distillate filel o i l-a virgin,a cracked,or a blend of virgin and cracked distillate,generally but not necessarily conforming to the requirements for Grade No.2 Fuel Oil given in Table 1 of Speci
14、fication D 396.5.4 intermediate marine diesel fuels-blends of residual fuel oil and distillate fuel oil,usually containing 5 to 50%distillate fuel oil.5.5 residual fuel oil-Grade No.6 Fuel Oil or any fuel oil containing residual components,-NOTE 3-When the residual fuel oil has a viscosity between 5
15、0 and 4057 for Of and 200 cSt at 50C(12279,the resulting blend may be too low in viscosity Petroleum Products3 D 396 Specification for Fuel Oils2 for satisfactory application of the test.2.2 ASTM Adjunct:6.Interferences not interfere,This test method is under the jurisdiction of ASTM Committee D-2 o
16、n Petroleum Products and Lubricants and is the direct responsibility of Subcom-mittee W2.05 on Properties of Fuels,Petroleum Coke,and Oil Shale.Current edition approved June 13,1988.Published August 1988.Onginally published as D 2781-69 T.Last previous edition D 2781-82.6.1 Water in concentrations normally encountered does Annual Book ofASTM Standards,Vol 05.01.Anniral Book ofASTM Standards,Vol 05.03.Reference spot sheefs are available at a nominal cost From ASTM Headquar-ten,1916 Race St.,Phila
