BS EN ISO 3016:2019 pdf download
BS EN ISO 3016:2019 pdf download.Petroleum and related products from natural orsynthetic sources – Determination of pour point.
2S mm from the bottom, and insert the test jar into the jacket. Never place a test jar directly into the
cooling medium.
7.7 Carry out observations for flow
7.7.1 At each thermometer reading that is a multiple a 3 -C below the temperature o the first observation, remove the test jar from the bath or jacket, as applicable, and tilt it just sufficiently to ascertain whether there is movement in the sample in the test jar. Typically, the complete operation of removal, wiping and replacement should not require more than 3 s.
7.7.2 ContInue observations at each thermometer reading that Is a multiple of 3 °C below the temperature of the first observation
After the specimen has cooled to allow the formation of paraffin wax crystals, take great care not to disturb the mass of specimen nor permit the thermometer to shift in the specimen; any disturbance of the spongy network of wax crystals will lead to low and erroneous results.
At low temperatures, condensed moisture can limit visibility. This may be removed by wiping the outside surface of the test jar with a clean cloth moistened with wiping fluid (e.g. ethanol or methanol) close to the bath temperature.
7.7.3 As soon as the sample does not flow when tilted, hold the test jar in a horizontal position for
5 s, as measured by the timing device (), and observe carefully, lithe sample shows any movement, replace the test jar immediately in the bath or jacket, as applicable, and repeat the observation at the next temperature. 3 GC lower.
7.7.4 Continue in this manner until a temperature is reached where the sample shows no movement when the test jar is held In a horizontal position for Ss. Record the observed reading of the thermometer.
7.8 II the sample has not ceased to flow when Its temperature has reached 27 C. transfer the test jar to
a jacket in a cooling bath maintained at 0 C ± 1,5 C. As the specimen continues to get colder, transfer the
test Jar to a jacket in the next lower temperature cooling bath in accordance with Tablc.1.
7.10 For fuel oils, heavy lubricant base stock and products containing residual fuel components, the result obtained by the procedure given In 2.1 to 7,8 Is the upper (maximum) pour point. If required. determine the lower (minimum) pour point by heating the sample while stirring to 105 C, pouring it into the par, and determining the pour point as given in 2.2 to 7.8.
B Expression of results
Add 3 C to the temperature recorded in 214 and 7.10 and report this as the pour point, or lower pour point, as applicable.
9 Precision
9.1 General
The precision statements were developed using llquidln•glass thermometers corresponding to those in ASTM ElibI or IP specifications for IP standard thermometers.
The precision statements are the derived values rounded up to the next testing Interval value. The actual derived precision values are given in Annex C.
9.2 Lubricating oils
9.2.1 General
The precision statements were derived from a 1998 Interlaboratory test program using ASTM D6300111 Participants analysed live sets of duplicate base oils, three sets of duplicate multigrade lubricating oils. and one set each of duplicate hydraulic oils and automatic transmission fluid in the temperature range of-Si C to —11 C. Seven laboratories participated with the manual test met hodIZI, Information on the type of samples and their average pour points are given in Reference 141
9.2.2 Repeatability
The difference between two test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of this test method, exceed 6 °C only In one case in 20. DIfferences greater than this should be considered suspect.
9.2.3 ReproducibIlity
The difference between two single and Independent results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of this test method, exceed 9 C only In one case In 20. Differences greater than this should be considered suspect.
9.3 Middle distillate and residual fuels
9.3.1 General
The precision statements were prepared with data on 16 middle distillate and residual fuels tested by 12 co-operatorsl5l. The fuels had pour points ranging from -33 °C In +51 °C,
NOTE Based on the results of the 19R3 interbbortory cooperative test program.
