NB/SH/T 0248-2019 in English
VALIDDiesel and domestic heating fuels-Determination of cold filter plugging point
- Issued on:2019-11-04
- Implemented on:2020-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$437.00
Introduction
Analysis of the core content of the standard
Principle of the method
The ability of fuel to pass through a 45μm stainless steel filter is determined under controllable cooling conditions using a vacuum suction device. The temperature at which 20mL of the sample flows for more than 60 seconds or cannot be completely refluxed is taken as the cold filter plugging point (CFPP).
Comparison of Key Technical Changes
| Change Dimensions | 2006 Edition | 2019 Edition |
|---|---|---|
| Scope of Application | Conventional diesel only | Added FAME and synthetic diesel fuel |
| Temperature Measurement | Glass Thermometer Only | Added Digital Thermometer (Appendix A) |
| Precision Requirements | Fixed Value | Calculated by Formula (Sections 14.2-14.3) |
Key points of instrument configuration
Core component requirements
- Test cup: glass material, 45mL scale line accuracy ±0.5mm
- Filter: 45μm stainless steel mesh, mesh tolerance ≤22μm
- Vacuum system: constant pressure 2kPa±0.05kPa (200mmH₂O)
Operation process optimization
Temperature control improvement
New sample pretreatment requirements: The sample temperature must be stabilized at 30℃±5℃ before testing, and the temperature uniformity control is improved compared with the 2006 version.
Clear termination conditions
When the temperature drops to -51℃ and there is still no blockage, it is necessary to clearly report "no blockage at -51℃" to avoid ambiguous judgment.
Application case analysis
Biodiesel adaptability
The test of a certain B5 biodiesel (containing 5% FAME) shows that the cold filter point is 3-5℃ higher than that of ordinary diesel, and special attention should be paid to the anti-corrosion treatment of metal parts (6.1.1 Warning clause).
Implementation suggestions
Laboratory configuration
- It is recommended to configure a three-stage cold bath (-34℃/-51℃/-67℃) to meet the wide range of tests
- Automatic instruments should preferably use digital thermometers with a resolution of 0.1℃
Quality control
Establish a semi-annual calibration plan in accordance with the requirements of Chapter 11, focusing on monitoring:
- Thermometers are traceable to national standards
- Regular verification of filter size (GB/T 6003.1)
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