This section specifies how to qualify alternative procedures for measuring absolute and method-defined fuel parameters under the Performance-based Analytical Test Method specified in § 1090.1360 .
Where:
[SIGMA]max = Maximum allowable standard deviation.
x1, x2, and x3 have the values from the following table:
Table 1 to Paragraph (b)(3)-Precision Criteria for Qualifying Alternative Procedures
Fuel, fuel additive, or regulated blendstock | Fuel parameter | Range | x1 | x2 = Repeatability (r) or reproducibility (R)1 | x3 | Fixed values of [SIGMA]max | Source2 |
ULSD | Sulfur | 5 ppm minimum | 1.5 | r = 1.33 | 2.77 | 0.72 | ASTM D3120-08 (R2019). |
500 ppm LM diesel fuel | Sulfur | 350 ppm minimum | 1.5 | r = 21.3 | 2.77 | 11.5 | ASTM D2622-16. |
ECA marine fuel | Sulfur | 700 ppm minimum | 1.5 | 37.1 | 2.77 | 20.1 | ASTM D2622-16. |
Butane | Sulfur | 1.5 | r = 0.1152.x | 2.77 | ASTM D6667-14 (R2019). | ||
Gasoline | Sulfur | 1.5 | r = 0.4998.x0.54 | 2.77 | ASTM D7039-15a (R2020). | ||
Gasoline | oxygenate | 0.3 | R = 0.13.x0.83 | 1 | ASTM D5599-18. | ||
Gasoline | RVP3 | 0.3 | R = 0.40 | 1 | 0.12 | ASTM D5191-20. | |
Gasoline | Benzene | 0.15 | R = 0.221.x0.67 | 1 | ASTM D5769-20. |
1 Calculate repeatability and reproducibility using the average value determined from testing. Use units as specified in § 1090.1350(c) .
2 ASTM publications are incorporated by reference, see § 1090.95 . Note that the listed procedure may be different than the referee procedure identified in § 1090.1360(d) , or it may be an older version of the referee procedure.
3 Use only 1-liter containers for testing to qualify alternative methods.
[DELTA]max = 0.75 · [SIGMA]max
Where:
[DELTA]max = Maximum allowable difference.
[SIGMA]max = the maximum allowable standard deviation from paragraph (b)(3) of this section using the sulfur content represented by ARV.
Table 2 to Paragraph (c)(3)(ii)-Accuracy Criteria for Qualifying Alternative Procedures With Diesel Fuel and Diesel-Related Blendstocks and Additives
Fuel | Sulfur content (ppm) | Illustrated maximum allowable differences |
ULSD | 10-20 | 0.54 |
500 ppm LM diesel fuel | 450-500 | 8.65 |
ECA marine fuel | 900-1,000 | 15.1 |
40 C.F.R. §1090.1365