Cold Filter Plugging Point (CFPP) Test Filter Unit
Model: BGL
Cold Filter Plugging Point Test Filter Unit is conforming to ASTM D6371<Standard Test Method for Cold Filter Plugging Point of Diesel and Heating Fuels> and SH/T 0248.
Filter(Filter Unit) and Filter Net(Brass Filter Holder) is conforming to ASTM D6371, SH/T 0248 and GB/T 6003.1<Technical requirements for wire mesh>. Suitable for detecting the cold filter plugging point (CFPP) temperature of diesel and domestic heating fuels using either manual or automated apparatus. This test method is applicable to distillate fuels, including those containing a flow-improving or other additive, intended for use in diesel engines and domestic heating installations.
Definition: Cold Filter Plugging Point
Highest temperature, expressed in multiples of 1 °C, at which a given volume offuel fails to pass through a standardized filtration device in a
specified time when cooled under the conditions prescribed in this test method.
| Material |
Brass |
| Specification |
330 mesh, 363 mesh |
| Spare Parts |
Filter Unit and Filter Holder Assembly |
Summary of Test Method
A specimen of the sample is cooled under specified conditions and, at intervals of 1 °C, is drawn into a pipet under a 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 is
continued until the amount of wax crystals that have separated out of solution is sufficient to stop or slow down the flow so that the time taken to fill the pipet exceeds 60 s or the fuel fails to return completely to the test jar before the fuel has cooled by a further 1 °C.
The indicated temperature at which the last filtration was commenced is recorded as the CFPP.
Significance and Use
The CFPP of a fuel is suitable for estimating the lowest temperature at which a fuel will give trouble-free flow in certain fuel systems.
In the case of diesel fuel used in European light duty trucks, the results are usually close to the temperature offailure in service except when the fuel system contains, for example, a paper filter installed in a location exposed to the weather or if the filter plugging temperature is more than 12 °C below the cloud point value in accordance with Test Method D2500, D5771, D5772, or D5773. Domestic heating installations are usually less critical and often operate satisfactorily at temperatures somewhat lower than those indicated by the test results.
The difference in results obtained from the sample as received and after heat treatment at 45 °C for 30 min can be used to investigate complaints of unsatisfactory performance under low temperature conditions.
Filter Unit
Containing the following elements:
(1) Brass Body, with a threaded cavity that houses the wire mesh holder. The cavity shall be fitted with an O-ring of oil-resistant plastics. The internal diameter of the central tube shall be 4 mm 6 0.1 mm.
(2) Brass Screw Cap, to connect the upper part of the body of the filter unit (see ASTM D6371 6.1.8.2) to the lower part of the pipet (see ASTM D6371 6.1.8.1) to ensure a leak free joint. An example of satisfactory connection is shown in Fig. 7 from ASTM D6371.
(3) Disc, 15 mm 6 0.1 mm diameter, of plain weave stainless steel wire mesh gauze with a nominal aperture size of 45 µm. The nominal diameter of the wire shall be 32 µm, and the tolerance for the size of an individual aperture shall be as follows:
-No aperture size shall exceed the nominal size by more than 22 µm.
-The average aperture size shall be within 6 3.1 µm of the nominal size.
-Not more than 6 % of the apertures shall be above the nominal size by more than 13 µm.
Filter Holder of Brass
In which the disc of wire mesh gauze (see ASTM D6371 6.1.8.2 (3)) is firmly clamped by a retaining ring pressed into the filter holder. The diameter of the exposed part of the gauze shall be 12 mm + 0.1 mm - 0.0 mm (see Fig. 8 from ASTM D6371).
Sampling
Unless otherwise specified in the commodity specification, samples shall be taken as described in Practice D4057 or D4177 in accordance with the requirements of national standards or regulation for the sampling ofthe product under test, or both.
Keywords
Automated cold filter plugging point; Cold filter plugging point (CFPP); Diesel; Domestic heating fuels; Filterability; Manual cold filter plugging point
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