ASHRAE 86 2013

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ASHRAE Standard 86-2013 Methods of Testing the Floc Point of Refrigeration-Grade Oil (BSR/ANSI/ASHRAE Approved)

Published By	Publication Date	Number of Pages
ASHRAE	2013	10

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Description

ANSI/ASHRAE Standard 86-2013 provides a method for measuring the waxing tendency of refrigeration-grade oils. Keywords: oil, refrigerant, floc, flocculent, wax, waxing, precipitate, R-12, hazy, cloudy, cloudiness

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4	FOREWORD 1. PURPOSE 2. SCOPE 3. DEFINITIONS 4. APPARATUS 4.1 Cooling Bath. A cooling bath is required for obtaining the necessary temperature. It is prepared by using dry ice or a refrigeration system as the cooling source. The cooling bath shall be large enough for testing three sample tubes at one time. … 4.2 Temperature-Measuring Devices. The temperature is measured with a precision electrical digital thermometer, a mercury thermometer, or an alcohol thermometer. ASTM standard thermometers 6F or 6C shall be used for this purpose. Thermometers shall b… 4.3 Sample Tube. The sample tube consists of a thick walled borosilicate glass tube with a flared end and round bottom, as shown in Figure 1. Tube dimensions are 0.375 in. (9.5 mm) ID × 0.600 in. (15 mm) OD × 9 in. (228 mm) long. The tube shall be … 4.4 Metal Connector Fittings. The metal connector fittings shall be as shown in Figure 1. 4.5 Graph Paper. In certain instances, graph paper is used with a glass plate to judge the cloudiness of the test sample. The graph shall have 20 lines per 1.0 in. (25.4 mm). 4.6 Mechanical Vacuum Pump. A mechanical vacuum pump that provides an absolute pressure of 13.3 Pa (0.1 mm Hg) shall be used.
5	5. TEST PROCEDURE 5.1 Use proper personal protective equipment (PPE), such as a face mask, protective shield, and heavy gloves when handling the charged pressure tube outside the cooling bath or when evacuating the tube. The glass tube is under pressure and a hazard e… 5.2 The sample tube shall be cleaned, dried, and stored in a desiccator prior to use. Appropriate precautions shall be taken to eliminate the introduction of water into the sample tube while charging with oil or refrigerant. Prepare a manifold or oth… Figure 1 Floc tube with metal connector. 5.3 Make sure that stirring of the liquid is adequate for obtaining uniform temperature within the cooling bath. Install the thermometer in a tube with the same tube dimensions as the floc tube. Immerse the tube in the bath, and fill it with the same… 5.4 Transfer 0.03 oz (1.0 mL) of the sample oil into the sample glass tube using a 0.07 oz (2.0 mL) syringe for precise oil measurement (at room temperature). Attach a small brass valve to the sample tube using the metal connector fittings. Evacuate … 5.5 Introduce a quantity of liquid R-12 so that the total volume of oil and R-12 is 0.34 oz (10.0 mL). The method of introduction shall preclude the introduction of water into the tube. This addition of R-12 and the measurement of the volume shall be… 5.6 The tube shall be disconnected from the charging assembly and allowed to warm up to the point where the refrigerant/oil mixture may be made homogenous by shaking. 5.7 The sample tube containing the refrigerant/oil mixture shall then be immersed in the cooling bath, which has previously been adjusted to a temperature of approximately 0°F (–18°C). Then the temperature of the cooling bath shall be lowered at … 5.8 If an oil shows a cloud at 0°F (–18°C), the test shall be repeated to make certain that water has not been inadvertently introduced into the oil during the charging operation. If an oil is wet, it can be dried by heating the oil under vacuum … 5.9 The tube shall be observed as the temperature is lowered, beginning at 0°F (–18°C). If a clear Dewar flask is used, the tube may be viewed through the Dewar flask. The tube may also be removed briefly (10 seconds) from the cooling bath for vi… 5.10 In some instances, the mixture becomes increasingly hazy or cloudy as the temperature is lowered but does not form distinct flocculent material. When this occurs, the tube shall be removed from the cooling bath and held against a glass plate wit…
6	5.11 Repeat the test with a second oil sample, run at a different time. If the results of these two observations agree within 5°F (3°C), the average of the two shall be reported as the floc point of the oil. 6. REPRODUCIBILITY OF RESULTS 7. SIGNIFICANCE OF RESULTS 8. REFERENCES INFORMATIVE ANNEX A— Round Robin Test Results TABLE A1 Round Robin Test Results—Test Conducted June 1982*
7	INFORMATIVE ANNEX B— BIBLIOGRAPHY

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Standard Title	ASHRAE Standard 86-2013 Methods of Testing the Floc Point of Refrigeration-Grade Oil (BSR/ANSI/ASHRAE Approved)
Published Code	ASHRAE
Publication Date	2013
Pages Count	10

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