GB/T 45373-2025 Petroleum and liquid petroleum products—Direct measurement of density in tanks—Resonance cylinder densitometer methods

Scope

This document specifies the general requirements for accuracy, measurement conditions, and measurement methods for directly measuring the density of oil products in tanks using resonant cylinder densimeters, and stipulates the measurement steps and/or installation requirements, as well as calibration and inspection methods for two types of equipment: portable electronic densimeters and automatic tank densimeters. This document applies to single-phase liquid petroleum products and their derivatives in atmospheric tanks with a vapor pressure of less than 100 kPa and sufficient fluidity. Other similar products that meet the requirements may refer to this document for implementation. This document applies to density measurement during inventory and transfer metering. This document does not apply to density measurement in pressurized tanks and refrigerated tanks. Note 1: For multifunctional electronic metering devices capable of measuring density, when based on the same principle as resonant cylinder densimeters, the density measurement part is equivalent to a resonant cylinder densimeter. Note 2: Resonant cylinder densimeters are generally suitable for low-viscosity liquid petroleum products without wax precipitation. However, they may be difficult to use for viscous crude oil and petroleum products, such as crude oil, lubricating oil, and residual fuel oil. Manufacturers typically provide the maximum viscosity of the applicable liquids in the user manual.

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