1、Designation: D7261 14D7261 17Standard Test Method forDetermining Water Separation Characteristics of DieselFuels by Portable Separometer1This standard is issued under the fixed designation D7261; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、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. Scope*1.1 This test method covers a rapid portable means for field and laboratory use to rate the abil
3、ity of diesel fuels (both neat andthose containing additives) to release entrained or emulsified water when passed through fiberglass coalescing material.1.2 This test method is applicable to diesel fuels such as Specification D975 Grade No. 11-D and Grade No. 22-D of all sulfurlevels, Specification
4、 D7467and MIL-F-16884, biodiesel blends B6-B20, and MIL-DTL-16884, naval distillate fuel (NATO F-76).NOTE 1This test method is similar to Test Method D3948 which is applicable to aviation turbine fuels.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement ar
5、e included in this standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability
6、 of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Tra
7、de Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D975 Specification for Diesel Fuel OilsD1193 Specification for Reagent WaterD3948 Test Method for Determining Water Separation Characteristics of Aviation Turbine Fuels by Portable SeparometerD4057
8、 Practice for Manual Sampling of Petroleum and Petroleum ProductsD4176 Test Method for Free Water and Particulate Contamination in Distillate Fuels (Visual Inspection Procedures)D4177 Practice for Automatic Sampling of Petroleum and Petroleum ProductsD4306 Practice for Aviation Fuel Sample Container
9、s for Tests Affected by Trace ContaminationD4860 Test Method for Free Water and Particulate Contamination in Middle Distillate Fuels (Clear and Bright NumericalRating)D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and LubricantsD6426 Test M
10、ethod for Determining Filterability of Middle Distillate Fuel OilsD7224 Test Method for Determining Water Separation Characteristics of Kerosine-Type Aviation Turbine Fuels ContainingAdditives by Portable SeparometerD7467 Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)2.2 Military Sta
11、ndard:MIL-F-16884MIL-DTL-16884 Fuel, Naval Distillate (NATO F-76)31 This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of SubcommitteeD02.14 on Stability and Cleanlinesson Stability, Cleanliness and Com
12、patibility of Liquid Fuels.Current edition approved Dec. 1, 2014Dec. 1, 2017. Published January 2015January 2018. Originally approved in 2006. Last previous edition approved in 20132014 asD7261 13.D7261 14. DOI: 10.1520/D7261-14.10.1520/D7261-17.2 For referencedASTM standards, visit theASTM website,
13、 www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-
14、5094, Attn: NPODS.for electronic download atASSIST Quick Search (http:/quicksearch.dla.mil).This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possib
15、le to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyr
16、ight ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Terminology3.1 For definitions of terms used in this test method that are not shown below, refer to Test Methods D3948 and D7224.3.2 Definitions:3.2.1 reference fluid, nin MSEP4 and DSEP4,
17、 diesel separability water separability tests a reference fluid base to which aprescribed quantity of a known surface active agent has been added.3.2.1.1 DiscussionThe known surface active agent is typically bis-2-ethylhexyl sodium sulfosuccinate, commonly referred to as AOT, dissolved intoluene.3.2
18、.2 surfactant, nin petroleum fuels, surface active material (or surface active agent) that could disarm (deactivate) filterseparator (coalescing) elements so that free water is not removed from the fuel in actual service.3.2.2.1 DiscussionTechnically, surfactants affect the interfacial tension betwe
19、en water and fuel which affects the tendency of water to coalesce intodroplets.3.2.3 strong surfactant, nin petroleum fuels, surface active material that disarms filter separator elements, allowing water topass.3.2.3.1 DiscussionStrong surfactants can be refinery process chemicals left in the fuel o
20、r contaminants introduced during transportation of the fuel.3.2.4 weak surfactant, nin petroleum fuels, surface active material, typically certain types of additives such as static dissipatoradditive, that does not adversely affect the performance of filter separator elements in actual service.3.3 D
21、efinitions of Terms Specific to This Standard:3.3.1 DSEP rating, nthe diesel separability rating of diesel fuel as measured by this test method.3.3.1.1 DiscussionDSEP ratings are only valid within the range of 50 to 100, with ratings at the upper end of the range indicating a clean fuel withlittle o
22、r no contamination by surfactants, which is expected to show good water-separating properties when passed through afilter-separator (coalescing type filter) in actual service; see 14.1.3.3.2 reference fluid base, na distillate diesel fuel that has been cleaned in a prescribed manner to remove all su
23、rface-activecontaminants (agents), and having a minimum DSEP rating of 97.3.3.2.1 DiscussionThe reference fluid base should be a diesel fuel typical of fuels to be tested.3.4 Abbreviations:3.4.1 acalternating current3.4.2 AOTAerosol OT (see 8.1)3.4.3 C/Scollect sample3.4.4 dcdirect current3.4.5 DSEP
24、diesel separability3.4.6 MSEPMicro-Separometer54 MSEP and DSEP are registered trademarks of EMCEE Electronics, Inc, 520 Cypress Ave., Venice, FL 34285.5 Micro-Separometer is a trademark of EMCEE Electronics, Inc, 520 Cypress Ave., Venice, FL 34285.D7261 1724. Summary of Test Method4.1 A50 mLA50 mLwa
25、ter/fuel sample emulsion is created in a syringe using a high-speed mixer.The emulsion is then expelledfrom the syringe at a programmed rate through a standard fiberglass coalescer and the effluent is analyzed for uncoalesced waterby a light transmission measurement.4.2 The results are reported on a
26、 0-to-100 scale to the nearest whole number, however the effective range of the test equipmentis from 50 to 100. High ratings indicate that water is easily coalesced, implying that the fuel is relatively free of surfactants.4.3 A test can be performed in 5 min to 10 min.5. Significance and Use5.1 Th
27、is test method provides a measure of the presence of surfactants in diesel fuels, and can be performed in the field or ina laboratory. Like Test Method D3948 used for jet fuel, this test method can detect traces of some refinery treating chemicals leftin fuel. It can also detect surface active subst
28、ances added to or picked up by the fuel during handling from point of production topoint of use.5.2 Certain additives, which can act as weak surfactants, give a slightly reduced DSEPrating. Other substances which are strongsurfactants give much lower DSEP ratings.5.3 While filter separators have not
29、 been common in diesel fuel systems, they could become more prevalent with ULSDcontaining increased additive content to ensure clean, dry fuels in new engine designs.This test method recommends use of theD cell coalescer when testing ULSD that contains less than 1 % biodiesel content. The DB cell co
30、alescer should be used whentesting B1-B20 blends. Weak surfactants, with slightly reduced DSEP ratings, do not significantly affect the ability of filterseparators to separate free water from the fuel. Strong surfactants give a much lower DSEP rating and adversely affect the abilityof filter separat
31、ors to separate free water from the fuel.5.4 Results from this test method do not have a known relationship to the rate of water settling in tanks.5.5 The Micro-Separometer instrument has a measurement range from 50 to 100. Values obtained outside of those limits areundefined and invalid.NOTE 2In th
32、e event a value greater than 100 is obtained, there is a good probability that light transmittance was reduced by material contained inthe fuel used to set the 100 reference level. The material was subsequently removed during the coalescing portion of the test, thus, the processed fuelhad a higher l
33、ight transmittance than the fuel sample used to obtain the 100 reference level resulting in the final rating measuring in excess of 100.6. Interferences6.1 Any suspended particles, whether solids or water droplets or haze, in a fuel sample will interfere with this test method,which utilizes light tr
34、ansmission of a fuel sample after emulsification with water and subsequent coalescence.6.2 Non-hydrocarbon Some non-hydrocarbon components such as oxygenates, especially alcohols, or emulsified water have notbeen verified for this test method and will likely interfere.7. Apparatus7.1 AMicro-Separome
35、ter6,7 instrument is used to perform the test. The unit is portable and self-contained, capable of operatingon an internal rechargeable battery pack or being connected to an ac power source using power cords which are available forvarious voltages. Connection to an ac power source will provide power
36、 to the unit and affect battery recharge. The accessories canbe packed in the cover of the lockable case.There are two versions of the Micro-Separometer: the MarkVDeluxe and the upgradedversion, Mark X.NOTE 3An extensive study was performed to verify that the Mark X Micro-Separometer gives equivalen
37、t results to the Mark V DeluxeMicro-Separometer. See Research Report RR:D02-1647.87.1.1 The Emcee Model 1140 Micro-Separometer Mark V Deluxe and associated control panel are shown in Fig. 1.NOTE 4Of the lettered (A-G) push buttons on the Mark V Deluxe, only the D push button is applicable to this te
38、st method.7.1.2 The Emcee Model 1140 Micro-Separometer Mark X and associated control panel are shown in Fig. 2. Table 1 lists themanual and audio operating characteristics of the instrument.NOTE 5Of the lettered push buttons that select the test mode, only the DIESEL push button is applicable to thi
39、s test method.6 The sole source of supply of the apparatus (Model 1140 Micro-Separometer, Mark V Deluxe and Mark X) known to the committee at this time is EMCEE Electronics,Inc., 520 Cypress Ave., Venice, FL 34285 www.emcee-. If you are aware of alternative suppliers, please provide this information
40、 to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend.7 The Model 1140 Micro-Separometers Mark III and Mark V Standard versions may also be used, but they are no longer supported by the manufact
41、urer. For operatingprocedures using these instruments, the user is referred to Test Method D394887.8 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:D02-1647.D7261 1737.1.3 Both the Mark V Deluxe and Mark X Micro-Separometers ha
42、ve the emulsifier located on the right side of the raised paneland the syringe drive mechanism on the left side. The control panel containing the operating controls (push buttons) is mountedon the fixed panel in the left side of the case. A circuit breaker located on the control panel provides prote
43、ction for the ac powercircuit. The turbidimeter is located under the main control panel and consists of a well in which the sample vial is placed, a lightsource, and a photocell.7.2 Beaker, Catch Pan, or Plastic Container(Supplied with each Micro-Separometer) used to receive the waste fuel duringthe
44、 coalescence period of the test.7.3 PipetAn automatic 50-L50 L hand pipet (supplied with each Micro-Separometer) designed to accept a disposableplastic tip.8. Reagents and Materials8.1 Aerosol OT, (AOT), solid (100 % dry) bis-2-ethylhexyl sodium sulfosuccinate.FIG. 1 Micro-Separometer Mark V Deluxe
45、and Associated Control PanelFIG. 2 Micro-Separometer Mark X and Control PanelTABLE 1 Manual and Audio Operating Characteristics of the Emcee Model 1140 Micro-Separometer Instrument forMode D/Diesel OperationAvailable Test Mode(s) Function Mark V Deluxe Mark XTest Mode - Select Mode DDepress D push b
46、utton Diesel push buttonSyringe Drive Not required Not requiredSpeed Selection Not required Not requiredClean CycleDepress START push button CLEAN 1CLEAN 2Initiate Automatic Test SequenceDepress START push button RUN push buttonCancel Automatic SequenceDepress RESET push button RESET push button1st
47、Meter Read1st Meter Adjust Depress ARROW push buttons Not required2nd Meter Read2nd Meter Adjust Depress ARROW push buttons Not requiredCollect Sample Short Tone and C/S Short Tone and C/SAnnunciator Lamp Illuminates Annunciator Lamp Illuminates3rd Meter ReadRecord Measurement Pulsed Tone Sounds 5 s
48、 into 3rd Meter Read Steady toneD7261 1748.2 Dispersing AgentToluene solution (WarningFlammable. Vapor harmful.) containing 1 mg ofAerosol OT per milliliterof toluene.8.3 Expendable Materials needed to perform the test are shown in Fig. 3 and consist of the following:98.3.1 Syringe Plug, (A)A plasti
49、c plug used to stopper the syringe during the clean and emulsion cycles.8.3.2 Syringe, (Barrel (B) and Plunger (C)A disposable 50 mL plastic syringe.8.3.3 Vials, (D), 25 mm outside diameter vial premarked for proper alignment in the turbidimeter well.8.3.4 DCell10 or DBCell Coalescer, (E) an expendable, pre-calibrated aluminum coalescer cell with a tapered end to fit thesyringe. It is labeled in a white background with black lettering:DCELL, DIESEL FUEL, D7261DBCELL, DIESEL FUEL, D72618.3.4.1 In order for a coalescer to be
