ASTM D156 PDF

Gurr During use of the product to send personnel to visit from time to time, to understand the use of equipment, and stored in user profiles. Products in this range include undyed motor and aviation gasolines, jet propulsion fuels, naphthas, kerosene and petroleum waxes. Link to Active This link will always route to the current Active version of the standard. Historical Version s — view previous versions of standard Translated Version s: Specifications Conforms to the specifications of: Type text as it appears:: Three-position turret on standard tube permits convenient changing of color disc combinations. When the color range of a particular product is known, a variation outside the established range can indicate possible contamination with another product.

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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the U. Department of Defense. The values given in parentheses are for information only. However the test method does use SI unitsof length when the length is not directly related to divisions on the oil tubeand Saybolt Color Numbers.

The test method uses SI units for tempera-ture. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.

Referenced Documents2. Also termed clean-and-bright. Summary of Test Method4. The colornumber above this level is reported, regardless of whether thesample was darker, questionable, or a match at the higher level.

Significance and Use5. Current edition approved April 1, Published April Originallyapproved in Last previous edition approved in as D — United States1quality characteristic since color is readily observed by the userof the product.

In some cases the color may serve as anindication of the degree of refinement of the material. When thecolor range of a particular product is known, a variation outsidethe established range can indicate possible contamination withanother product.

However, color is not always a reliable guideto product quality and should not be used indiscriminately inproduct specifications. Standardization of Apparatus7. Clean the disk, oil tube, and plain tube.

When deposits are notremovable by wiping or solvent rinsing, wash with soap andwater. After cleaning, rinse with distilled or deionized waterand with acetone or some other suitable solvent, and dry. Assemble the oil tube, and position the tubes in the instrument. The intensity oflight observed in each half of the optical field must be thesame.

Adjustment in the position of the light source may benecessary to achieve this match. If this occurs,follow the procedure in 7. The intensity of the light observed in each halfof the optical field must be the same, for the instrument to bejudged satisfactory for use.

The optical properties of glass,from different batches, can vary significantly and it is recom-mended that only matched tubes, such as described in theAppendix, be used in this test. When a tube is broken, replaceboth tubes with a matched pair of tubes. Preparation of Test Specimen9. If the sample is contained in a nontransparent container,shake or agitate the sample container vigorously to uniformlysuspend any free water that may be present in the samplebefore transferring a portion to a clear, transparent container toconduct the visual inspection before proceeding.

Warning—Take appropriate safety precautions in handling the sample atelevated temperatures. Fill the oiltube with the test specimen compare with a whole colorstandard. When the test specimen is lighter than the colorstandard, remove the standard and replace it with a halfstandard. Warning—It is important that all samples in the color tubesbe free from air bubbles. From thispoint, draw the test specimen level down to the nearest depthcorresponding to color number as shown in Table 1.

When thecolor of the oil observed through the eyepiece is still darkerthan the color standard, draw the oil down to the next depthgiven in Table 1, and compare. Continue this operation until adepth is reached where the test specimen and color standardmatch, or show questionable differences. At this point, lowerthe oil column to the next specified depth and, when the oil isunmistakably lighter than the color standard, record the colorcorresponding to the next higher level as the Saybolt color.

Examples of the procedure are given in Table 2. Procedure for Petroleum Wax Preheat the oil tube. Precision and Bias Close the tube at the bottom withan optical clear plano glass disk 6.

The tube shall be to mm longfrom the upper surface of the plano disk to the top of the tube. Mount the tube and disk in a suitable metal collar providedwith a petcock to permit controlled drainage of the tube Fig. Construct the collar in a manner that permits removal ofthe glass disk for cleaning.

Etch each inch-line completely around thetube, and number them consecutively from the 2 in.

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