(a) Distillate diesel fuels for testing must be clean and bright, with pour and cloud points adequate for proper engine operation.
(b) There are three grades of 2 diesel fuel specified for use as a test fuel. See the standard-setting part to determine which grade to use. If the standard-setting part does not specify which grade to use, use good engineering judgment to select the grade that represents the fuel on which the engines will operate in use. The three grades are specified in the following table:
Table 1 of Sec. 1065.703--Test Fuel Specifications for Distillate Diesel Fuel----------------------------------------------------------------------------------------------------------------
Ultra low High Reference procedure
Property Unit sulfur Low sulfur sulfur \1\----------------------------------------------------------------------------------------------------------------Cetane Number.................... --.................. 40-50 40-50 40-50 ASTM D613.Distillation range:
Initial boiling point........ [deg]C.............. 171-204 171-204 171-204 ASTM D86.
10 pct. point................ .................... 204-238 204-238 204-238 ASTM D86.
50 pct. point................ .................... 243-282 243-282 243-282 ASTM D86.
90 pct. point................ .................... 293-332 293-332 293-332 ASTM D86.
Endpoint..................... .................... 321-366 321-366 321-366 ASTM D86.Gravity.......................... [deg]API............ 32-37 32-37 32-37 ASTM D4052.Total sulfur, ultra low sulfur... mg/kg............... 7-15 .......... .......... See 40 CFR 80.580.Total sulfur, low and high sulfur mg/kg............... .......... 300-500 800-2500 ASTM D2622 or
alternates as
allowed under 40
CFR 80.580.Aromatics, min. (Remainder shall g/kg................ 100 100 100 ASTM D5186.
be paraffins, naphthenes, and
olefins).Flashpoint, min.................. [deg]C.............. 54 54 54 ASTM D93.Kinematic Viscosity.............. cSt................. 2.0-3.2 2.0-3.2 2.0-3.2 ASTM D445.----------------------------------------------------------------------------------------------------------------\1\ ASTM procedures are incorporated by reference in Sec. 1065.1010. See Sec. 1065.701(d) for other allowed
procedures.
(c) You may use the following nonmetallic additives with distillate diesel fuels:
(1) Cetane improver.
(2) Metal deactivator.
(3) Antioxidant, dehazer.
(4) Rust inhibitor.
(5) Pour depressant.
(6) Dye.
(7) Dispersant.
(8) Biocide. [70 FR 40516, July 13, 2005, as amended at 73 FR 37340, June 30, 2008; 73 FR 59341, Oct. 8, 2008; 75 FR 23057, Apr. 30, 2010; 77 FR 2464, Jan. 18, 2012;79 FR 23807, Apr. 28, 2014]