The test method of the DH 5 is used to find the ability of an oil to separate from water. The goal is to determine if the oil can fully separate from water. ASTM D was developed especially for steam-turbine oils with viscosities of However, the test method is also applicable to synthetic fluids and oils of other types having various viscosities.
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ASTM D test method is used to determine the ability of petroleum products and synthetic fluids to separate from water. This method may be used to test oils and other types of products with different viscosities at different temperatures than the original method developed for steam-turbine oils with viscosities in the range of The values in SI units are to be regarded as standard.
No other units of measurement are included in this standard. A precise and reliable determination of the ability of petroleum oils and other products to separate from water constitutes a valuable tool not only to more precisely determine the specifications of new oils but also to monitor in-service oils and optimize preventive maintenance programs of engines and machinery reducing downtime and repair costs avoiding unnecessary unscheduled maintenance.
This test method provides a guide for determining the water separation characteristics of oils subject to water contamination and turbulence. Add reagent water to the graduated cylinder to reach the mLmark when at test temperature. Typically, Invert the sample several times in the original container.
Do not pour, shake, or stir samples to any greater extent than necessary to prevent air entrainment. If initial volumetric measurements are made at room temperature, expansion occurring at the elevated test temperature will have to be considered.
Secure the cylinder in place directly under the stirring paddle. Lower the paddle into the cylinder until the stop engages at the required depth. Start the stirrer and a stop watch simultaneously and adjust the stirrer, as required, to a speed of 6 15 rpm. At the end of 5 min, stop the stirrer and raise the stirring assembly until it is just clear of the graduate.
Wipe the paddle with a spatula or wiper, allowing the liquid thus removed to drop back into the cylinder. At no time during a sample inspection shall an additional sample be added to the heating bath. In addition to reporting the time, report the volume of each layer in milliliters.
In all cases, report results as follows:. Report the time when either:. In addition to reporting the time, report the volume of each layer in millilitres. In both cases, report results as follows:. Some samples may produce a hazy oil layer without an emulsion layer. For uniformity, test results may be reported in the manner shown in the examples provided above i. More than 3 mL of emulsion had remained at 15 min. The emulsion layer at 25 min exceeded 3 mL, for example, or Heating Bath, sufficiently large and deep to permit the immersion of at least two test cylinders in the bath liquid up to their mL graduations as illustrated in two versions in Figure 1.
The cylinder shall be secured in a position so that the longitudinal axis of the paddle corresponds to the vertical center line of the cylinder during the stirring operation.
Cylinder, mL, graduated from 5 to mL in 1. The inside diameter shall be no less than 27 mm and no more than 30 mm throughout its length, measured from the top to a point 6 mm from the bottom of the cylinder. The overall height of the cylinder shall be to mm. The graduation shall not be in error by more than 1 mL at any point on the scale.
This precision is for the determination of the time in minutes to 3 mL of emulsion or 37 mL of water.
Significance and Use This test method provides a guide for determining the water separation characteristics of oils subject to water contamination and turbulence.
The appearance of each layer may be described in the following terms: Oil or Oil Rich Layer: 1 Clear. Water or Water-Rich Layer: 1 Clear. Emulsion: 1 Loose and lacy. Apparatus Heating Bath, sufficiently large and deep to permit the immersion of at least two test cylinders in the bath liquid up to their mL graduations as illustrated in two versions in Figure 1. We offer the following items that cover this method:.
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Standard Test Method for Water Separability of Petroleum Oils and Synthetic Fluids