Standard Test Method for Cold Filter Plugging …

1 Designation: D 6371 99An American National StandardStandard Test Method forCold Filter Plugging Point of diesel and Heating Fuels1 This Standard is issued under the fixed designation D 6371; 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 This test Method covers the determination of the coldfilter Plugging point (CFPP) temperature of diesel and domes-tic heating fuels using either manual or automated This test Method is technically equivalent to test methods IP309 and EN The manual apparatus and automated apparatus are bothsuitable for referee This test Method is applicable to distillate fuels, includ-ing those containing a flow-improving or other additive,intended for use in diesel engines and domestic Standard does not purport to address all of thesafety concerns, if any, associated with its use.

2 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 specific hazardstatements, see Section Referenced Standards:D 2500 Test Method for Cloud Point of Petroleum Oils2D 4057 Practice for Manual Sampling of Petroleum andPetroleum Products3D 4177 Practice for Automatic Sampling of Petroleum andPetroleum Products3D 5771 Test Method for Cloud Point of Petroleum Products(Optical Detection Stepped Cooling Method )4D 5772 Test Method for Cloud Point of Petroleum Products(Linear Cooling Rate Method )4D 5773 Test Method for Cloud Point of Petroleum Products(Constant Cooling Rate Method )4E 1 Specification for ASTM Standards:6IP 309 diesel and domestic heating fuels - Determination ofcold Filter Plugging pointSpecifications for IP Standard Standards:7IP 3310 Test sieves - Technical requirements and testing -Part 1: Metal Standards:8EN 116 diesel and domestic heating fuels - Determinationof cold Filter Plugging point3.

3 Of Terms Specific to This Filter Plugging point,n highest 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 reference material,n a stable petroleumproduct with a Method -specific nominal CFPP value estab-lished by a Method -specific interlaboratory study followingRR:D02-10079guidelines or ISO Guides 34 and Summary of Test 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 procedure is repeated, as the specimen continues to cool,for each 1 C below the first test temperature.

4 Testing 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 test Method is under the jurisdiction of ASTM Committee D-2 onPetroleum Products and Lubricants and is the direct responsibility of on Wax-Related Viscometric Properties of Fuels and edition approved Feb. 10, 1999. Published April Book of ASTM Standards, Vol Book of ASTM Standards, Vol Book of ASTM Standards, Vol Book of ASTM Standards, Vol from Institute of Petroleum, 61 New Cavendish St., London, W. I., from American National Standards Institute, 11 W. 42nd St., NewYork, from European Committee for Standardization, Central Secretariat,Rue Br derode 2, B-1000, Brussels, from ASTM ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United The indicated temperature at which the last filtrationwas commenced is recorded as the Significance and The CFPP of a fuel is suitable for estimating the lowesttemperature at which a fuel will give trouble-free flow incertain fuel In the case of diesel fuel used in European light dutytrucks, the results are usually close to the temperature of failurein service except when the fuel system contains, for example.

5 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 D 2500,D 5771, D 5772, or D 5773. Domestic heating installations areusually less critical and often operate satisfactorily at tempera-tures somewhat lower than those indicated by the test The difference in results obtained from the sampleasreceivedand after heat treatment at 45 C for 30 min can beused to investigate complaints of unsatisfactory performanceunder low temperature The apparatus, as detailed in , shall bearranged as shown in Fig. Jar, cylindrical, of clear glass, flat bottomed, withan internal diameter of mm, a wall thickness of mm and a height of 12065 mm.

6 The jar shall have apermanent mark at the 4561 mL Test jars of the required dimensions may be obtained byselection from jars conforming to Test Method D 2500, which specifies awider diameter , brass, watertight, cylindrical, flat bottomed, tobe used as an air bath. It shall have an inside diameter of mm, outside diameter of mm, and a height of11563 mm (see Fig. 2). Ring, made from oil-resistant plastics orother suitable material, to be placed in the bottom of the jacket(see ) to provide insulation for the bottom of the test shall fit closely inside the jacket and have a thickness of 6 + - (two), approximately 5-mm thick, made ofoil-resistant plastics or other suitable material, to be placed asshown in Fig. 1 around the test jar (see ) to provideinsulation for the test jar from the sides of the jacket.

7 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 test jardiameter. The spacers and insulating ring may be made as asingle part as shown in Fig. Ring, of oil resistant plastics or othersuitable non-metallic, non-absorbent, oil-resistant material,used to suspend the jacket (see ) in a stable and uprightposition in the cooling bath and to provide a concentriclocation for the stopper (see ). A design is shown in for guidance, but this design may be modified to suit thecooling , of oil-resistant plastics or other suitablenon-metallic, non-absorbent, oil-resistant material, to fit thetest jar and the support ring as shown in Fig.

8 5. It shall havethree holes to accommodate the pipet (see ) and thethermometer (see ) and to allow venting of the system. Ifnecessary, when using the high-range thermometer (see ),NOTE1 All dimensions are in millimetres, and the comma (,) is usedas the decimal 1 Arrangement of Manual CFPP ApparatusNOTE1 All dimensions are in millimetres, and the comma (,) is usedas the decimal 2 Watertight Brass JacketD6371 992the upper part of the stopper shall have an indentation to permitthe thermometer (see (a)) to be read down to a tempera-ture of -30 C. A pointer shall be fitted to the upper surface ofthe stopper to facilitate location of the thermometer in relationto the bottom of the test jar. A spring wire clip shall be used toretain the thermometer in the correct with Filter Pipet,, of clear glass with a calibration markcorresponding to a contained volume of mL at a mm from the bottom of the pipet (see Fig.)

9 6). It shallbe connected to the Filter unit (see ). Filter Unit(see Fig. 7), containing the followingelements:(a)A Brass Body, with a threaded cavity that houses the wiremesh holder. The cavity shall be fitted with an O-ring ofoil-resistant plastics. The internal diameter of the central tubeshall be mm;(b)A Brass Screw Cap, to connect the upper part of the bodyof the Filter unit (see ) to the lower part of the pipet ( ) to ensure a leak-free joint. An example of satisfactoryconnection is shown in Fig. 7.(c)A Disc, diameter, of plain weave stainlesssteel wire mesh gauze with a nominal aperture size of 45 nominal diameter of the wire shall be 32 m, and thetolerance for the size of an individual aperture shall be asfollows:(1) No aperture size shall exceed the nominal size by morethan 22 m;(2) The average aperture size shall be m of thenominal size.

10 (3) Not more than 6 % of the apertures shall be above thenominal size by more than 13 The requirements for the wire mesh are taken from ISO 3310,to which reference may be made for methods for testing the All dimensions are in millimetres, and the comma (,) is usedas the decimal 3 SpacersNOTE1 All dimensions are in millimetres, and the comma (,) is usedas the decimal 4 Supporting RingNOTE1 All dimensions are in millimetres, and the comma (,) is usedas the decimal 5 Stopper with Holes for Thermometer, Pipet, and VentD6371 993(d)A Filter Holder of Brass, in which the disc of wire meshgauze (see (c)) is firmly clamped by a retaining ringpressed into the Filter holder. The diameter of the exposed partof the gauze shall be 12 + - mm (see Fig. 8);(e)A Brass Cylinder, threaded on the outside, that can bescrewed into the cavity of the body (see (a)) to clampthe Filter holder (see (d)) against the O-ring ( (a)), The lower end shall have four slots to allow the specimento flow into the Filter , having ranges shown below and con-forming to the requirements prescribed in Specification E 1 orSpecifications for IP Standard NumberThermometerTemperature RangeASTMIPHigh-range for CFPP down to 30 C 38 C to +50 C5C1 CLow-range from CFPP below 30 C 80 C to +20 C6C2 CCooling bath 80 C to +20 The type of cooling bath is optional, but it shall beof a shape and size suitable for containing the jacket (see )