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Title: A Differential Pressure Meter for Low Reynolds Number Applications
Author: Craig Marshall
Source: 2017 North Sea Flow Measurement Workshop
Year Published: 2017
Abstract: Heavy oils are characterised depending on their density rather than their viscosity 1. Although there are various definitions for what constitutes heavy oil it is commonly agreed that the majority contain impurities such as asphaltenes, waxes and carbon residue. The API gravity definition, a common definition used in the oil and gas industry worldwide, states that heavy oil has an upper limit of 22. Figure 1 shows the upper and lower limits of various categories of oil as stated in the API gravity definition.

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