This Malaysian Standard specifies methods for the measurement of liquid flow in closed conduits by determining the volume of liquid collected in a volumetric tank in a known time interval. lt deals in particular with the measuring apparatus, the procedure, the method for calculating the flow-rate and the assessment of uncertainties associated with the measurements. The method described may be applied to any liquid provided that; a) its vapour pressure is sufficiently low to ensure that any escape of liquid by vaporization from the volumetric tank does not affect the required measurement accuracy; b) its viscosity is sufficiently low so as not to alter or delay unduly the measurement of the level in the volumetric tank; c) it is non-toxic and non-corrosive. Theoretically, there is no limit to the application of this method, but, for practical reasons, this method of measurement is normally used for flow-rates less than approximately 1,5 m3/s and is used on the whole in fixed laboratory installations only. However, there is a Variation of this method which uses a natura1 or artificial storage pond as a volumetric tank, but this application is not dealt with in this Malaysian Standard. Owing to its high potential accuracy, this method is often used as a primary method for calibrating other methods or devices for volume flow-rate measurement or for mass flow-rate measurement; for the latter method or device, it is necessary to know the density of the liquid accurately.

等同采用ISO 8316:1987, Measurement of liquid flow in closed conduits – Method by collection of the liquid in a volumetric tank