MIL-PRF-87260B(USAF)
APPENDIX A
A.3. TEST EQUIPMENT AND MATERIALS
The following minimum equipment is suggested for proper conduct of the testing:
a.
Three standard 55-gallon unlined steel drums, modified per the schematics.
b.
Fuel inlet: Standard pipe nozzle (0.82 inch inside diameter).
c. Fuel lines and fittings to provide transfer of fuel at a maximum flow rate of 65 gpm (60
±5 gpm) to the test tank (drum).
d. Fuel transfer pump and valving to adjust flow rate to the specified rate of 60 ±5 gpm
(37 ±5 fps at inlet).
e. Thermometer and portable fuel conductivity meter for checking temperature and
electrical conductivity of the test fuel before and after each test.
f. Equipment for measuring the ambient temperature and relative humidity around the
test area.
g.
Steel probe and teflon isolator for use in measuring voltage buildup within the tank.
h. Electrostatic voltmeter and recorder (printer) and/or mag tape recorder for measuring
and recording voltage buildup vs. time in the tank.
i. Equipment for measuring the electrical resistivity of the test foam material prior to and
after a test series on a product.
j. Fuel conforming to MIL-DTL-83133 or ASTM D1655, Grade JP-8 or Jet A-1
respectively is the preferred fuel; however, JP-5, (MIL-DTL-5624) or Jet A (ASTM D1655) are
approved alternates. The primary test fuel should be "free" of conductivity additive (antistatic
additive) and have a conductivity of less than 10 cu. In addition, testing with ASA additives at
50, 100, 200, 500, and 800 conductivity units should be accomplished by mixing the
fuel/additive to the desired level.
k. Test foam: Baseline orange polyester and blue polyether ESM per MIL-DTL-83054,
Types IV and V, as well as the conductive candidate material in the proper porosity range(s).
All drums shall be filled with foam for safety purposes.
l. Photographic equipment for documenting the test setup and fuel vapor ignitions (flame
out vent) including burned/singed foam.
A.4. TEST PARAMETERS AND DETAILS
The basic test setup is shown on FIGURE A-1 utilizing three standard (uncoated) 55-gallon
drums as the basic tank and fuel collector reservoir. The fuel should be transferred with an
electrically driven fuel transfer pump from the reservoir outlet to the test tank inlet located at the
top of the upper tank. The suggested flow rate is 60 ±5 gpm with corresponding inlet velocity of
37 ±5 fps at the pipe inlet nozzle (3/4 inch outside diameter). A ullage (gap) of one to two
inches should be provided at the fuel inlet between the nozzle and foam in the tank. All tanks
should be filled with foam (cylinders) cut to the drum inside diameter and 6, 8, or 12 inches high
(or combinations thereof). The test drum foam should be dry at the beginning of each sequence
of tests in order to provide a worse case condition. The fuel should be fresh and should not
contain any trace of electrical conductivity type additives and be verified by test just prior to and
after each evaluation. The preferred fuel type is JP-8 or Jet A-1; however, tests can be run
42
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business