FED-STD-791D
Method 3201.7
September 30, 1986
EMULSION (PETROLEUM AND PETROLEUM-LIKE PRODUCTS)
1. SCOPE
1.1 This method is used for determining the emulsifying tendency of petroleum and
petroleum-like products.
2. SUMMARY
2.1 The test consists of stirring the sample and its emulsifying agent at a specified
temperature, allowing the emulsion to remain undisturbed at the test temperature for the time
required by the specification, and examining the emulsion for any separation.
3. SAMPLE SIZE
3.1 Approximately 40 mL of the oil or fluid to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Graduated cylinder, 100 mL (approximately 28.6 mm [1-1/8 in] I.D.).
4.2 Heating bath (oil or water), 54 " 0.5C (130 " 1F) (unless otherwise specified)
deep enough to cover 85 mL mark of the graduated cylinder.
4.3 Stirring mechanism (Figure 1) consisting of:
a. Paddle, copper strip, 12.1 H 1.9 H 0.16 cm (4-3/4 H 3/4 H 1/16 in).
b. Shaft, stirring, with means for attaching paddle long enough to immerse paddle to
approximately 0.64 cm (1/4 in) from bottom of graduated cylinder.
c. Motor, stirring, approximately 1500 rpm, for rotating shaft and paddle.
4.4 Thermometer (range to suit requirements of specification).
4.5 Wooden stick or rubber policeman.
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,
emergency treatment and measures, and spill practices of each chemical are explained.
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