FED-STD-791D
Method 550.1
September 30, 1986
EMULSIFICATION TENDENCIES OF PETROLEUM FUELS
BY MULTIPLE CONTACT EXTRACTIONS
1. SCOPE
1.1 This method is used for determining the emulsification tendencies of petroleum fuels
resulting from contact with the water bottoms usually found in fuel storage environments.
2. SUMMARY
2.1 A sample composed of water and test fuel is placed in a sealed bottle and subjected
to a cycle consisting of shaking, settling, rating, siphoning, and addition of fresh fuel. The
appearance of the fuel-water interface is reported after the settling period. A total of ten
complete cycles is required.
3. SAMPLE SIZE
3.1 Approximately 1.1 L of the fuel to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Bottle, oil sample, 125 mL capacity (Kimble No. 60520L or equal), with No. 24
plastic screw cap.
4.2 Gasket material, fluorocarbon vulcanizate (Viton or equal), 0.16-cm thick sheet
stock, cut to the I.D. of the No. 24 screw cap (approximately 2.1 cm).
4.3 Syringe, B.D., Luer-Lok, 100-mL capacity.
4.4 Syringe needle, Teflon (or equal), with Kel-F (or equal) hub, 16-gauge, 30.5-cm
(12-in.) length (Hamilton No. KF16TF or equal).
4.5 Mechanical reciprocating shaker device (Equipoise Heavy-Duty or equal).
4.6 Graduated cylinder, 100-mL capacity.
5. MATERIALS
5.1 CAUTION - SOME MATERIALS ARE TOXIC AND HAZARDOUS. The
chemical materials listed in this section must be handled carefully. Federal Test Method 10000,
Material Handling Safety Precautions, is a reference which lists all toxic and hazardous materials
cited in FTMS 791. The synonyms, life hazard, flammability, handling and storage precautions,
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