An instrument for the measurement of density of a liquid flowing in a pipeline

• A discussion of the measurement method and of the structure of a density meter.
• The density meter is dedicated for use in horizontal pipelines.
• Measurement is conducted at the U-tube (bypass) equipped with DP transmitter.
• The density meter is dedicated for newly designed as well as operated pipelines.

This article presents a system of the measurement of density of a liquid flowing in a pipeline based on a quasi-hydrostatic measurement. A concept of a density meter is discussed. A physical and mathematical description of the new solution is presented together with an assessment of pressure losses along the measuring section and results of numerical modelling of the design parameter selection. Also, the meter prototype which has been tested in the sugar industry is presented. The meter is intended for industrial measurements of density of liquids and solutions of liquids flowing in a pipeline and automation of installations for separating, combining or concentrating liquid solutions. This instrument could be of special importance in areas such as the food, oil or chemical industries to perform density measurements and to correct variable density in flow measurements.