ASTM D7566 for Aviation Turbine Fuel Containing Synthesized Hydrocarbons
7. Detailed Requirements
7.1 The aviation turbine fuel shall conform to the requirements prescribed in Table 1 Part 1 and Table 1 Part 2 unless otherwise noted in 7.2, Annex A1, Annex A2, or Annex A3, whichever is applicable.
7.2 The fluidity requirement of Part 2 of Table 1 only applies to each batch of fuel containing the synthesized iso-paraffins (SIP) blending component as defined in Annex A3 and blended in accordance with 6.1.3. This requirement does not apply to fuel containing Annex A1 or Annex A2 synthesized components and blended in accordance with 6.1.1 or 6.1.2.
7.3 The additional requirements of Part 2 of Table 1 apply only for each batch of fuel intentionally containing a synthetic blending component. The additional requirements of Part 2 of Table 1 are not mandated if conventionally-derived jet fuel ismixed with the residue of a D7566 semi-synthetic aviation turbine fuel in refinery equipment from a previous batch of certified final blended product, for example in a tank heel.
7.4 Test results shall not exceed the maximum or be less than the minimum values specified in Table 1, Tables A1.1 and A1.2, Tables A2.1 and A2.2, and Tables A3.1 and A3.2. No allowance shall be made for the precision of the test methods. To determine conformance to the specification requirement, a test result may be rounded to the same number of significant figures as in Table 1, Tables A1.1 and A1.2, Tables A2.1 and A2.2, and Tables A3.1 and A3.2 using Practice E29. Where multiple determinations are made, the average result, rounded in accordance with Practice E29, shall be used.
8. Workmanship, Finish, and Appearance
8.1 The aviation turbine fuel specified in this specification shall be visually free of undissolved water, sediment, and suspended matter. The odor of the fuel shall not be nauseating or irritating. If the fuel has an odor similar to that of "rotten egg", please refer to X1.12.5 for further discussion. No substance of known dangerous toxicity under usual conditions of handling and use shall be present, except as permitted in this specification.
9. Sampling
9.1 Because of the importance of proper sampling procedures in establishing fuel quality, use the appropriate procedures in Practice D4057 or IP 475 to obtain a representative sample from the batch of fuel for specification compliance testing. This requirement is met by producing fuel as a discrete batch then testing it for specification compliance. This requirement is not satisfied by averaging online analysis results.
9.2 A number of jet fuel properties, including thermal stability, water separation, electrical conductivity, and others, are very sensitive to trace contamination, which can originate from sample containers. For recommended sample containers, refer to Practice D4306.
