Specific Gravity for common fluids are indicated in the table below. For gases the Specific Gravity is related to air. Knowing the oil gravity, water gravity and water cut, calculate the composite SG of the produced fluids: Specific Gravity - SG - is a dimensionless unit defined for liquids as 'the ratio of the density of the substance to the density of water at a specified temperature'. The specific gravity of this mixture is calculated as shown in the following equation: Specific Gravity 60☏ Made from heavy-walled, annealed tubing for maximum strength Built-in non-mercury thermometer Lead-free ballast Conforms to ASTM accuracy requirements Each thermo-hydrometer comes with a Certificate of Conformance traceable to NIST. The composite specific gravity of oil and water mixture can be calculated if the individual fluid’s specific gravities and percentages are known. API gravity can be converted to specific gravity using the API to Specific Gravity Conversion equation, while specific gravity can be converted to API gravity using the Specific to API Gravity Conversion equation. Oil density is often reported in terms of API gravity. Liquids and gases with a specific gravity greater than one are heavier than water or air. Freshwater and air have a specific gravity of one. Change to read: Unless otherwise stated in the individual monograph, the specific gravity determination is applicable only to liquids, and, unless otherwise. For gases, the values are calculated by multiplying the specific gravity of the gas by the value for air. Certain liquid physical values can be calculated by multiplying the specific gravity of that liquid by the value for fresh water. This method covers the procedure for calculating the theoretical specific gravity of a mixture of aggregates that have been combined on a weight basis. Specific gravity is a dimensionless value that compares all liquids to fresh water and all gases to air. The arbitrary formula used to obtain this effect is presented in the following paragraphs. API gravity is graduated in degrees on a hydrometer instrument and was designed so that most values would fall between 10° and 70° API gravity. A specific gravity scale developed by the American Petroleum Institute (API) for measuring the relative density of various petroleum liquids, expressed in degrees. specific gravity, also called relative density, ratio of the density of a substance to that of a standard substance.
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