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)

APPENDIX C

Bleed valve, 1/4-inch, Whitey Micro Metering, Catalog No. 22RS4 or equivalent

Trap, vacuum, separable, joint 29/42; VNVR Catalog No. 55096-100 or equivalent

Dewar flask, vacuum, flask large enough to accommodate the vacuum trap and cooling medium

Neoprene stoppers, green, solid No. 5 and No. 4, VWR Catalog No. 59589-212 and 59589-198 or

equivalent. The No. 5 and the No. 4 neoprene stoppers must be drilled with holes to permit passage

of 3/32-inch OD probe through the No. 5 stopper and 1/4-inch OD tubing through the No. 4 stopper.

Thermocouples, Chromel-Alumel, calibrated, 3/32-inch diameter, SS sheathed, closed end. Thermocouple

probe 10-inch long with 6-foot lead wire

Omega Digicator or equivalent, for thermocouple temperature read-out

Transducer, 0 to 15 psia, transducer housing to be equipped with threaded fitting compatible with 1/4-inch

Swagelok hardware.

Digital pressure readout system, Anadex Model DPM-735-V1-A115, or equivalent

Refrigerated cooling bath, Endocal Model RTE-5B or equivalent.

C6. SAMPLE

The sample will be prepared as follows:

1. Transfer 600 mL of the sample into a clean, 1000-mL separatory funnel.

2. Cap the funnel top.

3. Shake the funnel for 1 to 2 minutes.

4. Allow contents to settle for 15 to 20 minutes.

5. Draw off lower 100 mL of fuel and discard.

C7. PREPARATION OF APPARATUS

Preparation of the apparatus includes the following steps:

1. Assemble the apparatus as shown on figure C1.

2. Place 300 mL of the prepared sample and a magnetic stir bar in the 500-mL flask.

3. Place ice around the vacuum trap in the Dewar flask.

4. Position the vapor phase thermocouple through the No. 5 stopper so the probe tip is centered and even

with the top rim of the 24/40 joint of the 500-mL flask.

5. Place the liquid phase thermocouple in the flask thermometer well and add 5 mL of high-flashpoint oil

to the well.

6. Begin the stirring action with the magnetic stirrer set at a high speed. Open the micrometer bleed valve

and slowly engage the vacuum. If the vacuum system is opened too rapidly, the fuel may bump up into the

condenser. Begin to close the bleed valve as the system pressure decreases. When the bleed valve is completely

closed, continue the fuel outgassing for a period of 10 minutes.