ÖNORM EN ISO 3993

This International Standard specifies a method for the determination of density or relative density of liquefied petroleum gases and other light hydrocarbons. The prescribed apparatus shall not be used for materials having gauge vapour pressures higher than 1,4 MPal) (14 bar) (absolute vapour pressure 1,5 MPa) at the test temperature. CAUTION - Attention is drawn to the hazards encountered when working with liquefied petroleum gas or light hydrocarbons. The requirements of any national, local or domestic safety code should always be strictly observed. Alternative calibration procedures are described, but only the one using a certified hydrometer is suitable for the determination of density to be used in calculations of quantities for custody transfer or fiscal purposes. NOTE An alternative method for calculating the density of liquefied petroleum gases from gas chromatographic analysis is described in IS0 65782). Provision is made in the annex for the use of thermohydrometers.