1、Designation: D6371 16Standard Test Method forCold Filter Plugging Point of Diesel and Heating Fuels1This standard is issued under the fixed designation D6371; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 the determination of the coldfilter plugging point (CFPP) temperature of diesel and domes-tic heating fue
3、ls using either manual or automated apparatus.NOTE 1This test method is technically equivalent to test methodsIP 309 and EN 116.1.2 The manual apparatus and automated apparatus are bothsuitable for referee purposes.1.3 This test method is applicable to distillate fuels, includ-ing those containing a
4、 flow-improving or other additive,intended for use in diesel engines and domestic heatinginstallations.1.4 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 WARNINGMercury has been designated by manyregulatory agencies as a ha
5、zardous material that can causecentral nervous system, kidney, and liver damage. Mercury, orits vapor, may be hazardous to health and corrosive tomaterials. Caution should be taken when handling mercury andmercury-containing products. See the applicable product Ma-terial Safety Data Sheet (MSDS) for
6、 details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information. Users should be aware that selling mercuryand/or mercury containing products in your state or countrymay be prohibited by law.1.6 This standard does not purport to address all of thesafety concerns, if any, associa
7、ted 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. For specificwarning statements, see Section 7.2. Referenced Documents2.1 ASTM Standards:2D2500 Test Me
8、thod for Cloud Point of Petroleum Productsand Liquid FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5771 Test Method for Cloud Point of Petroleum Products(Optical Detection Stepped Cooling Method)D577
9、2 Test Method for Cloud Point of Petroleum Products(Linear Cooling Rate Method)D5773 Test Method for Cloud Point of Petroleum Products(Constant Cooling Rate Method)D7962 Practice for Determination of Minimum ImmersionDepth and Assessment of Temperature Sensor Measure-ment DriftE1 Specification for A
10、STM Liquid-in-Glass ThermometersE1137 Specification for Industrial Platinum Resistance Ther-mometersE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision LiquidsE2877 Guide for Digital Contact Thermometers2.2 IP Standards:3IP 309 Diesel and domestic heating fuelsDeterm
11、ination ofcold filter plugging pointSpecifications for IP Standard Thermometers2.3 ISO Standards:4IP 3310 Test sievesTechnical requirements and testingPart 1: Metal cloth2.4 European Standards:5EN 116 Diesel and domestic heating fuelsDeterminationof cold filter plugging point1This test method is und
12、er the jurisdiction of ASTM Committee D02 onPetroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flow Properties.Current edition approved Dec. 1, 2016. Published January 2017. Originallyapproved in 1999. Last previous edition approved in 2010 as
13、D6371 05 (2010).DOI: 10.1520/D6371-16.2For 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 Energy
14、Institute, 61 New Cavendish St., London, WIG 7AR,U.K., http:/www.energyinst.org.uk.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.5Available from European Committee for Standardization (CEN), 36 rue deStassart, B-1050, B
15、russels, Belgium, http:/www.cenorm.be.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recogni
16、zed principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13. Terminology3.1 Definitions:3.1.1 digital contact thermometer (D
17、CT), nan electronicdevice consisting of a digital display and associated tempera-ture sensing probe.3.1.1.1 DiscussionThis device consists of a temperaturesensor connected to a measuring instrument; this instrumentmeasures the temperature-dependent quantity of the sensor,computes the temperature fro
18、m the measured quantity, andprovides a digital output. This digital output goes to a digitaldisplay and/or recording device that may be internal or externalto the device. These devices are sometimes referred to as a“digital thermometer.”3.1.1.2 DiscussionPET is an acronym for portable elec-tronic th
19、ermometers, a subset of digital contact thermometers(DCT).3.2 Definitions of Terms Specific to This Standard:3.2.1 certified reference material, na stable petroleumproduct with a method-specific nominal CFPP value estab-lished by a method-specific interlaboratory study followingRR:D02-10076guideline
20、s or ISO Guides 34 and 35.43.2.2 cold filter plugging point, nhighest temperature,expressed in multiples of 1 C, at which a given volume of fuelfails to pass through a standardized filtration device in aspecified time when cooled under the conditions prescribed inthis test method.4. Summary of Test
21、Method4.1 A specimen of the sample is cooled under specifiedconditions and, at intervals of 1 C, is drawn into a pipet undera controlled vacuum through a standardized wire mesh filter.The procedure is repeated, as the specimen continues to cool,for each 1 C below the first test temperature. Testing
22、iscontinued until the amount of wax crystals that have separatedout of solution is sufficient to stop or slow down the flow sothat the time taken to fill the pipet exceeds 60 s or the fuel failsto return completely to the test jar before the fuel has cooled bya further 1 C.4.2 The indicated temperat
23、ure at which the last filtrationwas commenced is recorded as the CFPP.5. Significance and Use5.1 The CFPP of a fuel is suitable for estimating the lowesttemperature at which a fuel will give trouble-free flow incertain fuel systems.5.2 In the case of diesel fuel used in European light dutytrucks, th
24、e results are usually close to the temperature of failurein service except when the fuel system contains, for example,a paper filter installed in a location exposed to the weather orif the filter plugging temperature is more than 12 C below thecloud point value in accordance with Test Method D2500,D
25、5771, D5772,orD5773. Domestic heating installations areusually less critical and often operate satisfactorily at tempera-tures somewhat lower than those indicated by the test results.5.3 The difference in results obtained from the sample asreceived and after heat treatment at 45 C for 30 min can beu
26、sed to investigate complaints of unsatisfactory performanceunder low temperature conditions.6. Apparatus6.1 Manual Apparatus:6.1.1 The apparatus, as detailed in 6.1.2 6.1.13, shall bearranged as shown in Fig. 1.6.1.2 Test Jar, cylindrical, of clear glass, flat bottomed, withan internal diameter of 3
27、1.5 mm 6 0.5 mm, a wall thickness of1.25 mm 6 0.25 mm and a height of 120 mm 6 5 mm. The jarshall have a permanent mark at the 45 mL 6 1 mL level.NOTE 2Test jars of the required dimensions may be obtained byselection from jars conforming to Test Method D2500, which specifies awider diameter toleranc
28、e.6.1.3 Jacket, brass, watertight, cylindrical, flat bottomed, tobe used as an air bath. It shall have an inside diameter of45 mm 6 0.25 mm, outside diameter of 48 mm 6 0.25 mm,and a height of 115 mm 6 3 mm (see Fig. 2).6.1.4 Insulating Ring, made from oil-resistant plastics orother suitable materia
29、l, to be placed in the bottom of the jacket(see 6.1.3) to provide insulation for the bottom of the test jar.It shall fit closely inside the jacket and have a thickness of6 mm + 0.3 mm - 0.0 mm.6.1.5 Spacers (two), approximately 5 mm thick, made ofoil-resistant plastics or other suitable material, to
30、 be placed asshown in Fig. 1 around the test jar (see 6.1.2) to provideinsulation for the test jar from the sides of the jacket. Thespacers shall fit closely to the test jar and closely inside thejacket. The use of incomplete rings, each with a 2 mmcircumferential gap, will accommodate variations in
31、 test jardiameter. The spacers and insulating ring may be made as asingle part as shown in Fig. 3.6.1.6 Supporting Ring, of oil resistant plastics or othersuitable non-metallic, non-absorbent, oil-resistant material,used to suspend the jacket (see 6.1.3) in a stable and uprightposition in the coolin
32、g bath and to provide a concentriclocation for the stopper (see 6.1.7). A design is shown in Fig.4 for guidance, but this design may be modified to suit thecooling bath.6.1.7 Stopper, of oil-resistant plastics or other suitablenonmetallic, nonabsorbent, oil-resistant material, to fit the testjar and
33、 the support ring as shown in Fig. 5. It shall have threeholes to accommodate the pipet (see 6.1.8) and the thermom-eter (see 6.1.9) and to allow venting of the system. If necessary,when using the high-range thermometer (see 6.1.9), the upperpart of the stopper shall have an indentation to permit th
34、ethermometer (see 6.1.9) to be read down to a temperature of30 C. A pointer shall be fitted to the upper surface of thestopper to facilitate location of the thermometer in relation tothe bottom of the test jar. A spring wire clip shall be used toretain the thermometer in the correct position.6.1.8 P
35、ipet with Filter Unit:6.1.8.1 Pipet, of clear glass with a calibration mark corre-sponding to a contained volume of 20 mL 6 0.2 mL at a point6Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1007. ContactASTM CustomerService a
36、t serviceastm.org.D6371 162149 mm 6 0.5 mm from the bottom of the pipet (see Fig. 6).It shall be connected to the filter unit (see 6.1.8.2).6.1.8.2 Filter Unit (see Fig. 7), containing the followingelements:(1) Brass Body, with a threaded cavity that houses the wiremesh holder. The cavity shall be f
37、itted with an O-ring ofoil-resistant plastics. The internal diameter of the central tubeshall be 4 mm 6 0.1 mm.(2) Brass Screw Cap, to connect the upper part of the bodyof the filter unit (see 6.1.8.2) to the lower part of the pipet (see6.1.8.1) to ensure a leak-free joint. An example of satisfactor
38、yconnection is shown in Fig. 7.(3) Disc,15mm6 0.1 mm diameter, of plain weavestainless steel wire mesh gauze with a nominal aperture size of45 m. The nominal diameter of the wire shall be 32 m, andthe tolerance for the size of an individual aperture shall be asfollows:No aperture size shall exceed t
39、he nominal size by morethan 22 m.The average aperture size shall be within 6 3.1 m of thenominal size.Not more than 6 % of the apertures shall be above thenominal size by more than 13 m.(4) Filter Holder of Brass, in which the disc of wire meshgauze (see 6.1.8.2 (3) is firmly clamped by a retaining
40、ringpressed into the filter holder. The diameter of the exposed partof the gauze shall be 12 mm + 0.1 mm 0.0 mm (see Fig. 8).(5) Brass Cylinder, threaded on the outside, that can bescrewed into the cavity of the body (see 6.1.8.2 (1) to clampthe filter holder (see 6.1.8.2 (4) against the O-ring (6.1
41、.8.2(1), The lower end shall have four slots to allow the specimento flow into the filter unit.NOTE 3The requirements for the wire mesh are taken from IP 3310,to which reference may be made for methods for testing the gauze.6.1.9 Temperature Measuring DeviceEither a liquid-in-glass thermometer as de
42、scribed in 6.1.9.1 or a digital contactthermometer (DCT) meeting the requirements described in6.1.9.2.6.1.9.1 Liquid-in-glass Thermometers, having ranges shownbelow and conforming to the requirements prescribed inSpecifications E1 or E2251, or Specifications for IP StandardThermometers.ThermometerNu
43、mberThermometer Temperature Range ASTM IPHigh-range for CFPP down to30 C38 C to +50 C 5C, S5C 1CLow-range from CFPP below30 C80 C to +20 C 6C 2CCooling bath 80 C to +20 C 6C 2C6.1.9.2 Digital contact thermometer requirements:Parameter RequirementDCT Guide E2877 Class G or betterTemperature Range 80
44、C to +50 CDisplay Resolution 0.1 C, minimumSensor Type Platinum Resistance Thermometer (PRT)Sensor 3 mm o.d. sheath with a sensing elementless than 10 mm in lengthMinimum Immersion Less than 40 mm per Practice D7962.Accuracy 500 mK (0.5 C) for combined probe andsensorResponse Time Less than or equal
45、 to 25 s as defined inSpecification E1137.Drift Less than 500 mK (0.5 C) per year.Calibration Error Less than 500 mK (0.5 C) over the range ofintended use.Calibration Range 80 C or lower to +50 CCalibration Data 4 data points evenly distributed over calibra-tion range with data included in calibrati
46、onreport.Calibration Report From a calibration laboratory with demon-strated competency in temperature calibrationwhich is traceable to a national calibrationlaboratory or metrology standards body.NOTE 4A DCT display mounted on the end to the probes sheath islikely not suitable due to temperature ex
47、posure of the electronics. Consultmanufacturer for temperature limitations.6.1.9.3 The DCT calibration drift shall be checked at leastannually by either measuring the ice point or against areference thermometer in a constant temperature bath at theprescribed immersion depth to ensure compliance with
48、 6.1.9.2.See Practice D7962.NOTE 5When a DCTs calibration drifts in one direction over severalcalibration checks, it may be an indication of deterioration of the DCT.6.1.10 Cooling Bath:6.1.10.1 The type of cooling bath is optional, but it shall beof a shape and size suitable for containing the jack
49、et (see 6.1.3)in a stable and upright position at the required depth.6.1.10.2 The bath shall be fitted with a cover with one ormore holes in it to accommodate the supporting ring (see6.1.6). The jacket (see 6.1.3) may be permanently mounted inthe cover.6.1.10.3 The bath temperature shall be maintained at therequired value and tolerance by a refrigeration unit or by theuse of suitable freezing mixtures, ensuring a homogenoustemperature in the bath by stirring or other means of agitation.Table 1 lists the bath tem
