(a) Liquefied petroleum gas used as a test fuel must meet the specifications in the following table:
Table 1 of § 1065.220_Test-Fuel Specifications for Liquefied Petroleum Gas
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Item Procedure \1\ Value
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1. Propane........................ ASTM D 2163-91 85.0 vol. percent minimum.
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2. Vapor pressure at 38° C... ASTM D 1267-02 or 2598-02 14 bar maximum.
\2\
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3. Volatility residue (evaporated ASTM D 1837-02 -38° C maximum.
temp., 35° C).
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4. Butanes........................ ASTM D 2163-91 5.0 vol. percent maximum.
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5. Butenes........................ ASTM D 2163-91 2.0 vol. percent maximum.
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6. Pentenes and heavier........... ASTM D 2163-91 0.5 vol. percent maximum.
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7. Propene........................ ASTM D 2163-91 10.0 vol. percent maximum.
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8. Residual matter (residue on ASTM D 2158-02 0.05 ml maximum pass.\3\
evap. of 100 ml oil stain
observ.).
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9. Corrosion, copper strip........ ASTM D 1838-91 No. 1 maximum.
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10. Sulfur........................ ASTM D 2784-98 80 ppm maximum.
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11. Moisture content.............. ASTM D 2713-91 pass.
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\1\ All ASTM standards are incorporated by reference in § 1065.1010.
\2\ If these two test methods yield different results, use the results from ASTM D 1267-02.
\3\ The test fuel must not yield a persistent oil ring when you add 0.3 ml of solvent residue mixture to a
filter paper in 0.1 ml increments and examine it in daylight after two minutes (see ASTM D 2158-02).
(b) At ambient conditions, the fuel must have a distinctive odor detectable down to a concentration in air of not over one-fifth of the lower flammability limit.