Alaska Administrative Code
Title 18 - Environmental Conservation
Chapter 53 - Fuel Requirements for Motor Vehicles
Article 1 - Oxygenated Gasoline Requirements
18 AAC 53.030 - Sampling, testing, and oxygen content calculations

Universal Citation: 18 AK Admin Code 18 AAC 53.030

Current through August 30, 2024

(a) To comply with the requirements of this chapter, the oxygen content of gasoline must be determined by

(1) taking a representative sample of the gasoline to be tested, using the sampling methods specified in 40 C.F.R. 80, Appendix D, as amended through July 1, 1996, hereby adopted by reference;

(2) testing the gasoline sampled to determine the mass concentration of each oxygenate, using the test method specified in ASTM D 4815-94a, as approved July 25, 1994, hereby adopted by reference; and

(3) using the following oxygen content calculations, with volume measurements adjusted to 60º Fahrenheit:
(A) for blends with only one oxygenate:

V oxygenate x d oxygenate x WW oxygen = _________ (V gas x d gas) + (V oxygenate x d oxygenate)

where:W= weight fraction (for percent, multiply by 100) oxygenate= oxygenate in the blend V= volume fraction d= specific gravity gas= gasoline

(B) for blends with more than one oxygenate:

W oxygen = UNHANDLEDCHAR (V oxygen x d oxygenate x W oxygen/oxygenate) _________ (V gas x d gas) + UNHANDLEDCHAR (V oxygenate x d oxygenate)

where:W= weight fraction (for percent, multiply by 100) oxygenate= oxygenate in the blend V= volume fraction d= specific gravity gas= gasoline

(b) The oxygen molecular weight contributions of an oxygenate approved for use under this chapter are set out in the following table:

OXYGEN MOLECULAR WEIGHT CONTRIBUTIONS

Oxygen Molecular

Weight Contribution Specific Gravity

at 60° Fahrenheit Methanol 0.49930.796 Ethanol 0.34730.794 Propanols 0.26620.789 Butanols 0.21580.810 Pentanols 0.18150.817 Methyl

Tertiary-Butyl

Ether (MTBE) 0.18150.744 Hexanols 0.15660.823 Ethyl Tertiary-Butyl

Ether (ETBE) 0.15690.755 Tertiary Amyl Methyl

Ether (TAME)0.15660.770

The sampling and testing procedures referred to in this section may be reviewed at the department's Anchorage, Fairbanks, or Juneau offices. ASTM D 4815-94a may be ordered from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428 (610-832-9500).

Authority:AS 44.46.020

AS 46.03.010

AS 46.03.020

AS 46.14.020

AS 46.14.030

AS 46.14.510

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