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Title: Crude Oil Gathering By Truck - MERING Vs. Tank Gauging Class 300
Author: Dale A. Bohman
Source: 1999 International School of Hydrocarbon Measurement
Year Published: 1999
Abstract: Measurements made for the custody transfer of crude oil at lease stock tanks are at present petformed by manual gauging. API Chapter 18 describes the methods for obtaining quantitative and qualitative values for volumetric measurement of tank contents. The second edition, published in April 1997, very specifically describes the process for taking measurement readings to determine the amount of merchantable oil transferred from the tank to the transporting truck. Delivery of the same transfer of product is more accurately measured by a metering system than by tank gauging. The significance of factors affecting the volumetric measurements obtained by metering and tank gauging are discussed. These factors include variations in operating conditions, such as temperature, pressure, viscosity, and air, as well as inherent accuracy considerations for self-checking features, volume resolution, linear measurements, and tank measurements.

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