MIL-DTL-38219D(USAF)
APPENDIX A
VAPOR PRESSURE TEST
A1. SCOPE
A1.1 The test covered by this appendix is designed to determine the vapor pressure of JP-7 jet fuel by distillation
and vapor reflux methods. This appendix is a mandatory part of the specification. The information contained herein
is intended for compliance.
A2. APPLICABLE DOCUMENTS
ASTM D86
Standard Test Method for Distillation of Petroleum Products (DoD adopted)
A3. METHOD A DISTILLATION
A3.1 Perform distillation according to ASTM D86.
A3.2 If 20 percent distillation point falls between 182.2°C (360°F) and 215.6°C (420°F) and there is not more than
27.8°C (50°F) difference between the initial boiling point and 20 percent fuel evaporated point, read the vapor
pressure directly from figure A1.
A3.3 Record and report the results.
A4. METHOD B - VAPOR REFLUX
A4.1 Apparatus. The apparatus for this test shall include the following:
a. Vacuum pump
b. Powerstat
c. Magnetic stirrer, Teflon-coated stirring bar magnet
d. Heating mantle, Glas-Col 500 mL
e. Flask, Pyrex round bottom, 500 mL, short neck T joint 24/40 with thermometer well
f. Pyrex T joints 24/30 and 10/30
g. Condenser, reflex, Friedrichs with T joint 24/30
h. Thermometer, mercury T joint 10/30, 75 mm, immersion 10°C to 250°C
i. Thermometer, mercury, 76 mm, immersion 10°C to 260°C
j. Manometer, U tube
k. Rubber tubing, vacuum and medium wall
l. Stopcock, needle valve, brass 1/4 inch
m. Condenser, cold finger, size 10, 300 mm
n. Dewar flask, vacuum.
A4.2 Solutions. None.
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