BS EN 15195:2014
$142.49
Liquid petroleum products. Determination of ignition delay and derived cetane number (DCN) of middle distillate fuels by combustion in a constant volume chamber
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 32 |
This European Standard specifies a test method for the quantitative determination of ignition delay of middle distillate fuels intended for use in compression ignition engines. The method utilizes a constant volume combustion chamber designed for operation by compression ignition, and employing direct injection of fuel into compressed air that is controlled to a specified pressure and temperature. An equation is given to calculate the derived cetane number (DCN) from the ignition delay measurement.
This European Standard is applicable to diesel fuels, including those containing fatty acid methyl esters (FAME) up to 30 % ( V/V). The method is also applicable to middle distillate fuels of non-petroleum origin, oil-sands based fuels, blends of fuel containing biodiesel material, diesel fuel oils containing cetane number improver additives and low-sulfur diesel fuel oils. However, users applying this standard especially to unconventional distillate fuels are warned that the relationship between derived cetane number and combustion behaviour in real engines is not yet fully understood.
The test method is also applicable to the quantitative determination of the ignition characteristics of FAME, especially the ignition delay. However the correlation data available were inconclusive about the precision of the equation. So the determination of derived cetane number for FAME fuel, also known as B100, has not been included in the precision determination as in Clause 12 2) .
This European Standard covers the ignition delay range from 2,8 ms to 6,3 ms (71 DCN to 34 DCN). The combustion analyser can measure shorter or longer ignition delays, but precision is not known. For these shorter or longer ignition delays the correlation equation for DCN is given in Annex D.
There is no information about how DCNs outside the 34 to 71 range compares to EN ISO 5165 .
For the purpose of this European Standard, the expression “ % ( V/V)” is used to represent the volume fraction and “% ( m/m)” the mass fraction.
The use of this standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Contents Page |
| 6 | Foreword |
| 7 | Introduction |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions |
| 10 | 4 Principle 5 Reagents and materials |
| 11 | 6 Apparatus 6.1.1 General Figure 1 — Schematic overview of combustion analyser |
| 12 | Figure 1 — Schematic overview of combustion analyser (continued) |
| 13 | 7 Sampling 8 Apparatus assembly and installation 9 Preparation of apparatus 9.1 System start-up and warm-up |
| 14 | 9.2 Standard operating and test conditions Table 1 — Standard operating and test conditions |
| 15 | Table 2 — Tolerance limits for apparatus calibration and verification 10 Calibration, verification and quality control 10.1 General 10.2 Calibration |
| 16 | 10.3 Apparatus verification 10.4 Quality control (QC) 11 Test procedure |
| 17 | 12 Calculation 13 Expression of results 14 Precision 14.1 General 14.2 Repeatability 14.3 Reproducibility |
| 18 | Table 3 — Precision values Table 4 — Exemplary precision data Table 4A — Ignition delay data Table 4B — Derived cetane number data 15 Test report |
| 19 | Annex A (normative) Test apparatus description A.1 General A.2 Apparatus description and assembly |
| 20 | Figure A.1 — Schematic of combustion chamber |
| 21 | A.3 Utilities A.4 Control and data acquisition A.5 Auxiliary apparatus |
| 22 | Annex B (normative) Operational details in support to the standard test procedure B.1 Fuel injection system flushing B.2 Fuel injection system filling and purging |
| 23 | B.3 Test sequence B.3.1 General B.3.2 Test sequence |
| 24 | Figure B.1 —Typical signal output of motion and pressure sensors for a single combustion cycle B.3.3 Data record |
| 25 | B.4 Fuel injection system cleaning B.5 Alternative fuel injection system cleaning |
| 27 | Annex C (informative) Apparatus maintenance C.1 General C.2 Daily maintenance C.3 Weekly maintenance C.4 Yearly maintenance |
| 28 | Annex D (informative) Equation outside scope of method |
| 29 | Bibliography |
