BS EN 13016-3:2018 pdf download

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BS EN 13016-3:2018 pdf download

BS EN 13016-3:2018 pdf download.Liquid petroleum products – Vapour pressure
1 Scope
This European Standard specifies a method for the determination of the vapour pressure, exerted in vacuo, by volatile, low viscosity petroleum products, components, ethanol blends up to 85 % (V/V ), and feedstocks using a variable volume chamber. A dry vapour pressure equivalent (DVPE]) is calculated from the vapour pressure. The conditions used in the test described in this standard are a vapourto②liquid ratio of 4:1 and a test temperature of 37,8 °C. The equipment is not wetted with water during the test, and the method described is therefore suitable for testing samples with or without oxygenates; no account is taken of dissolved water in the sample. This procedure calculates the partial pressure of the air dissolved in the test portion during the triple expansion process. It is suitable for samples with a DVPE between 13,7 kPa and 98,3 kPa; vapour pressures outside this range can be measured but the precision has not been determined. This document is applicable to fuels containing oxygenated compounds up to the limits stated in the relevant Council Directive 85/536/EEC [6], and for ethanol@fuel blends up to 85 % [V/V) ethanol. NOTE For the purposes of this European Standard, the terms“% (m/m)”and“% (V/V)” are used to represent the mass and volume fractions respectively. WARNING一The use of this Standard can involve hazardous materials, operations and equipment. This Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of users of this standard to take appropriate measures to ensure the safety and health of personnel prior to application of the standard, and fulfil statutory and regulatory requirements for this purpose.
4 Principle
Employing a measuring chamber with a built团in piston, a test portion of known volume is drawn into the measuring chamber that is temperature controlled at approximately 20 °C. After sealing the measuring chamber, the temperature of the measuring chamber is increased to the 37,8 °C test temperature simultaneously with the first expansion using the piston. Two further expansions are performed to a final test volume of five times that of the test specimen. After each expansion, the total vapour pressure is measured. The PPA from the test portion is calculated from the three resulting pressures. The vapour pressure of the test portion is calculated by subtracting the PPA from the final total vapour pressure. The calculated vapour pressure is converted to a dry vapour pressure equivalent (DVPE) by applying a correlation formula. NOTE For liquids containing very low levels of high vapour pressure contaminants, which behave like a gas, this test method that determines the PPA and gases, can lead to wrong results since the partial pressure of the contaminants will be included in the PPA.