MIL-DTL-38219 Turbine Fuel, Low Volatility, Jp-7This specification covers one grade of aviation turbine fuel designated as JP-7. This specification was thoroughly reviewed as a part of acquisition reform. While most of the requirements were converted to performance terms, due to the military-unique nature of the product and the need for compatibility with deployed systems, it was determined that not all requirements could be converted. The issuance of this specification as "detail" is not intended to constrain technology advances in future systems.

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MIL-DTL-38219D(USAF)

TABLE I. Chemical and physical requirements and test methods - Continued.

ASTM Standards

Requirements

Minimum

Maximum

Test Methods

Thermal Stability (JFTOT)

D3241

JFTOT, change in pressure drop

25.0

in 5 hours, mm Hg

JFTOT, delta TDR Spun

Existent Gum, mg/100 mL

5.0

D381

Particulate Matter, mg/L

D2276 or D5452

Origin

0.3

Destination

0.5

Water Reaction, Interface rating

D1094

Separation rating

(2)

Water Separometer Index

D3948

Fuel System Icing Inhibitor,

0.10

0.15

D5006

vol percent

The mercaptan determination may be waived at the option of the inspector if fuel is "Doctor Sweet" when tested

in accordance with ASTM D4952.

A condenser temperature of 0�C to 4.4�C (32�F to 40�F) shall be used. To insure accurate IBP data, the operator

must cut back on the heating rate when the vapor/condensate ring rises to within about 25 mm (1 in.) of the vapor

tube. The reduced heating rate allows the thermometer to reflect more accurately the true vapor temperature when

the first condensate is collected.

The temperature reading at the 20 percent recovered point shall be corrected for the emergent stem in accordance

with ASTM E77, paragraph 7, Treatment of Data.

Test shall be performed in accordance with the vapor pressure test in appendix A or appendix C of this

specification.

Until an ASTM thermometer calibrated for the -20�C condition becomes available, this test may be conducted at

-34.5�C (-30�F) with a maximum allowable viscosity of 15.0 centistokes.

Mass hydrogen content may be calculated using ASTM D3343 or measured using ASTM D3701. In case of

conflict, ASTM D3701 shall apply.

For specific test conditions see 4.5.2.1.

Filter not less than 3.79 liters (1 gallon) of fuel to determine the total solids.

Test shall be performed in accordance with ASTM D5006 or FED-STD-791, method 5327, method 5340, or

method 5342. Use the appropriate scale of the refractometer.

Referee test method.

If air is used instead of steam while performing ASTM D381, it must be reported. In case of a failure with air, the

sample must be retested using steam.