BS EN 12595-2000 pdf download.Methods of test for petroleum and its products — BS 2000-319:
Bitumen and bituminous binders — Determination of kinematic viscosity (Identical with IP 319-2000).
The time for a fixed volume of the liquid to flow through the capillary of a calibrated glass capillary viscometer under an accurately reproducible head and at a closely controlled temperature is determined. The kinematic viscosity is calculated by multiplying the efflux time in seconds by the viscometer calibration factor.
5 Apparatus
Usual laboratory apparatus and glassware. together with the following.
5.1 Vlscometer, Cannon-Fenske, the Zeittuchs Cross-Arm and BS/lP/RF viscometers. capillary-type, made of borosilicate glass, suitable for this method are described in Figures A.1, A.2 and A.3, and Tables A.1, A.2 and A.3. Other viscometers are allowed if test results obtained are comparable.
Calibrated viscometers are available from commercial suppliers. Details regarding the calibration of viscometers are given in annex C.
5.2 Thermometers, calibrated liquid-in-glass, of an accuracy of 0,2 °C can be used or another thermometric device of equal accuracy as described in annex B.
The specified thermometers shall be standardized at total immersion that is immersion to the top of the mercury column with the remainder of the stem and the expansion chamber at the top of the thermometer exposed to room temperature.
NOTE 1: The practice of completely submerging the thermometer is not recommended. When thermometers are completely submerged, corrections foc each individual thermometer based on calibration under conditions of complete submergence are determined and applied, If the thermometer is completely submerged in the bath during use, the pressure of the gas in the expansion chamber will be higher or lower than during standardization. and can cause a high or low reading on the thermometer.
It is essential that liquid-in-glass thermometers be recalibrated periodically and that official corrections be adjusted as necessary to conform to any changes in temperature readings. The thermometer shall be read, estimating the reading to 0,1 CC.
NOTE 2: Thermometers should be checked at regular time Intervals.
NOTE 3: A commonly used procedure given in Method ASTM E 77 applies correction which is based on changes in the ice point calibration.
Other temperature measuring devices may be used instead of mercury stem thermometers. However, the mercury stem thermometer is the reference device. Therefore any alternative device employed shall be calibrated so as to provide the same readings as would be provided by the mercury stem thermometer, recognizing and allowing for the fact of changed thermal response times compared with the mercury thermometer.
5.3 Bath, suitable for immersion of the viscometer so that the liquid reservoir or the top of the capillary, whichever is uppermost, is at least 20 mm below the upper bath level, and with provisions for visibility of the viscometer and the thermometer. Firm supports for the viscometer shall be provided, or the viscometer shall be an integral part of the bath. The efficiency of the stirring and the balance between heat losses and heat input shall be such that the temperature of the bath medium does not vary by more than 0,3 °C (measurement at 60 °C) or 0,5 °C (measurement at 135 °C) over the length of the viscometer, or from viscometer to viscometer in the various bath positions.
Water. conforming to the grade 3 of EN ISO 3696, is a suitable bath liquid for determinations at 60 °C. USP white oil or any paraffinic or silicone oil with a flash point above 215 °C has been found suitable for determination at 135 °C. The flash point is determined in accordance with EN 22592,
5.4 Timer, stop watch (spring or battery driven) graduated in divisions of 0,1 S or less and accurate to
0.5 s over 1 000 s when tested over intervals of not less than 15 mm.
5.5 Electrical timing devices, for use only on electrical circuits the frequencies of which are accurate to 0,5 s over 1 000 s or better.
NOTE: Alternating currents, the frequencies of which are intermittently and not continuously controlled, as provided by some public power systems. can cause large errors, particularly over short timing intervals, when used to actuate electrical timing devices.
5.6 Automatic or semi-automatic equipment, are allowed providing that they meet the specifications for temperature regulation and time accuracy described in this clause and have been shown to achieve the same precision as given in clause 10 and are fully calibrated.
6 Preparation of test samples
The laboratory sample shall be taken in accordance with EN 58. Prepare the sample in accordance with EN 12594.
Bring the viscometer and the sample to within ±30 °C of the test temperature (in order to avoid correction of constants of the viscometer). Stir the sample thoroughly without entrapment of air. If the temperature has dropped to 30 °C or more below the test temperature, reheat the sample.
Immediately charge the viscometer, or, if the test is to be made at a later time, pour approximately 20 ml into one or more clean, dry containers having a capacity of approximately 30 ml and immediately seal with an airtight dosure.
7 Procedure
7.1 Test conditions.BS EN 12595-2000 pdf download.