Manual calculation methods for BMD and VCF?
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May I ask about your standard density for oils and the formula used to calculate VCF? Those who are interested in knowing would be kind to share their insights; thank you! ! ! !
1 According to the requirements for measurement operations, determine the total height of oil and water in the tank as well as the water level. 2 Determine the temperature of the oil inside the tank in accordance with the requirements for temperature measurement. 3 According to the requirements for density measurement, determine the test temperature and apparent density. 4 Determine the total volume V of oil and water from the oil tank capacity table, based on the total height of oil and water. 5 Determine the standard density of the oil based on the test temperature and apparent density. 6 Determine the volume correction factor VCF value for the oil based on the measured temperature and standard density. 7 Determine the air buoyancy coefficient F value of the oil based on its standard density. For oil tanks with a storage capacity of 1000 m3 or more, the increase in the static pressure volume due to water inside the tank, ΔVP_water, is determined based on the total height of oil and water in the tank. Thereafter, the increase in the static pressure volume due to oil inside the tank, ΔVP_oil, is calculated: ΔVP = ΔVP_water • ρ20 (where the increase in static pressure volume for crude oil is ΔVP = ΔVP_water • ρ see ). The volume of water in the tank, V_water, is then found using the water level measured in the tank’s volume chart. 9 Calculate the volume of the oil in the tank at t℃. a. When the temperature of the oil in the tank differs from the standard temperature by no more than ±10°C, the formula for calculating the volume of the oil is: Vt = V_table – V_water + △VP. b. When the temperature of the oil in the tank differs from the standard temperature by more than ±10°C, the formula for calculating the volume of the oil is: Vt = (V_table – V_water + △VP). Here, 0.000036 represents the volume expansion coefficient of the steel tank (1/°C) ； t----The temperature of the tank steel plate can be taken as the oil temperature. 10 Calculate the weight of the oil in the tank. a. The calculation formula using the air buoyancy correction factor is: m = V20•ρ20•F = VCF•Vt•ρ20•F; when the floating deck of the tank moves up and down, m = VCF•Vt•ρ20•F – W. b. The calculation formula using the air buoyancy correction value is: m = (ρ20–1.1)•V20; when the floating deck of the tank moves up and down, m = (ρ20–1.1)•V20 – W. Where: W represents the weight of the floating deck. When using the above two formulas to calculate the quality of oil products, in case of any disputes over the results, the value obtained from the formula m=ρ20•V20•F shall prevail. 11 The basic formula for calculating the mass of benzene products is: m = Vt • ρt. Here, m represents the mass of the benzene products ； Vt ---- Volume of benzene products at t℃ ； ρt---- Density of benzene products at t°C ； The density ρt of benzene-based products at temperature t℃ is calculated as ρt = ρvis + γ(tvis – toil), where γ is the density temperature coefficient for benzene-based products. γ-benzene = 0.00105 γ-toluene = 0.00092 γ-xylene = 0.00085 γ-dimethylbenzene = 0.00085. Calculate the weight of the benzene-based product: m = Vt•ρt – w. In the formula: W----weight of the floating vessel.
Reply to 1# 331575246 regarding product measurement (as per the 98 national standard): 1. The quantity of the product is calculated based on its mass in air. 2. When the apparent density of the product is measured using a petroleum densitometer at non-standard temperatures, the standard density (ρ20) of that product should be obtained from Table 59B. 3. When calculating the quantity of products, the volume of the products at the measurement temperature usually needs to be converted into a standard volume. The standard volume (V20) of a product is obtained by multiplying the volume at the measurement temperature (Vt) by the volume correction factor (VCF20) that corrects the volume to the standard volume at the measurement temperature, as shown in Equation (1). The volume correction factor is obtained from Table 60B using the standard density and the measurement temperature. V20 = Vt * VCF20 (1) 4. When calculating the mass of the product in air (commercial mass), an adjustment for air buoyancy must be made: the standard density (kg/m3) is reduced by the air buoyancy correction value of 1.1 kg/m3, and then this value is multiplied by the standard volume to obtain the product’s mass (m), as shown in equation (2). m = V20 * (ρ20 – 1.1) (2) Example of calculation for the quantity of product: 1. The oil transfer temperature for a certain product is 40 degrees, and the volume of oil transferred is 1240.62 m3. The apparent density of this product at 40 degrees, as determined using the density of petroleum, is 753.0 kg/m3. Calculate the mass of the oil transferred. 2. Using the apparent density of the product at a test temperature of 40°C, which is 753.0 kg/m3, Table 59B is consulted to obtain ρ20 = 770.0 kg/m3.
3. With the standard density of 770.0 kg/m3 and the transportation temperature of 40°C, Table 60B is used to find that VCF20 = 0.9775; therefore, V20 = 1240.62 * 0.9775 ≈ 1212.706 m3. The mass of oil transported is equal to 1212.706 * (770.0 – 1.1) ≈ 932449.6 kg, or approximately 932.450 tons.
4. Using ρ20 = 770.0 kg/m3, Table E1 is consulted to obtain ρ15 = 774.3 kg/m3. Then, Table E3 is used with this value to determine that the coefficient in barrels per ton is 8.140 barrels/ton. Thus, the number of barrels required is equal to the mass of oil transported multiplied by this coefficient: 932.450 * 8.140 ≈ 7590.1 barrels.
5. For convenience, Tables E1 – for converting the density of the product from 20°C to 15°C, Table E2 – for converting the density from 15°C to 20°C, Table E3 – for converting the density to a coefficient in barrels per ton, and Table E4 – for converting units – have been prepared. Standard density calculation method 1: Experimental temperature: also known as the temperature in the cup, it refers to the temperature of the sample in the experimental cup as measured in the laboratory after the sampler retrieves the sample ； 2. Experimental density: Also known as apparent density, it refers to the actual density of the sample in the testing vessel, as measured in the laboratory after the sample is obtained by the tester ； 3. Regarding Table 59b: This table is a standard density table; by referring to it based on the test temperature and test density, the standard density can be obtained. Our company has imported this table into an MDB database file; the name of the database file is syjlb.mdb, and the name of the 59b table is t_p20 ； 4. Standard density: Obtained from Table 59b by referring to the experimental temperature and experimental density; this is the standard density P20 ； VCF calculation method 1: Definition: Volume correction factor, which is used to convert the volume measured at the time of measurement into a standard volume ； v20 = vt * vcf ； 2. vcf: Obtain vcf by referring to the 60b table based on the current measurement temperature and standard density ； 3. Regarding Table 60b: This is a VCF table; by referring to it along with the measured temperature and standard density, the volume correction factor VCF can be obtained. Our company has imported this table into an MDB database file; the name of the database file is syjlb.mdb, and the name of the 60b table is t_vcf ； Weight calculation method: 1. Using the national standard formula: g = (p20 – 0.0011) * vcf * vt ； 2. Parameter overview: (1) p20: Standard density; for detailed calculation methods, see Section II. (2) 0.0011: Air weight of the product after measurement ； (3) vcf: Volume correction factor; for the detailed calculation method, see Section III. (4) vt: Measured volume of the product, which is obtained by referring to the volume table based on the liquid level height ； For the detailed calculation method, see «5» ； Method for calculating VT (actual volume): 1. Principle: Any value of a container (oil tank) within its safe height range corresponds to a unique volume value ； The unit for liquid level height is millimeters, while the unit for volume is generally liters ； The table required for calculations by the program is the “millimeter capacity table”. After obtaining the height, the program uses SQL statements to calculate the volume: “select tiji from where yewei=”. 2. Types of capacity tables: (1) Decimeter capacity table: This is the most common type; the unit used to measure the liquid level in this table is decimeters. For example, for a tank that is 10 meters high, its decimeter-based table will contain 100 rows of values ； (2) Centimeter capacity scale: (3) Millimeter capacity scale: Ordinary customers do not provide the millimeter capacity scale directly; we calculate it ourselves based on the capacity scale data provided by the user ； 3. Concept of ladder range: (1) When measuring the volume of oil in barrel-shaped tanks, since the capacity in cubic centimeters or millimeters remains constant (or approximately constant) within a certain range, this range is referred to as a ladder range. Ideally, a tank should exhibit a linear relationship over its height range, but in reality such a linear relationship is not possible due to deformation; therefore, stepped rings are introduced to improve measurement accuracy ； 4. Types of tanks and methods for calculating volume: (1) Horizontal tanks ； It is generally used in generators and temporary storage areas. Horizontal tanks are considered irregular tanks, and the methods for measuring their volume are specified by the users ； Provide the formula or a detailed volume table, and then our company will generate a \"millimeter volume table\"” ； (2) Spherical tank: belongs to high-pressure tanks ； It belongs to the category of irregular tanks, and its volume measurement method is provided by the user ； Provide the formula or a detailed volume table, and then our company will generate a \"millimeter volume table\"” ； (3) Other irregular tanks: These are classified as irregular tanks, and their volume measurement methods are specified by the user ； Provide the formula or a detailed volume table, and then our company will generate a \"millimeter volume table\"” ； (4) Barrel tanks: These belong to the category of regular tanks, and this type is commonly used on site; the method for generating the \"millimeter capacity table\" for this type of tank will be explained in detail below ； 5. Method for generating the “millimeter capacity table” for barrel-shaped tanks: (1) Create a “master table” database file (mdb): as shown in the figure below; (2) Create a “rim” database file (mdb): in the same database file as (1) ； The number of fields to create is related to the number of turns ； (3) Create the database table for the millimeter capacity table: (4) Generation: Write a program to calculate the target value. Special cases: (1) If the capacity table does not have stepped rings, then interpolation is used directly for the calculations ； (2) The example mentioned above refers to a gauge with capacities in decimeters; if it is a gauge with capacities in centimeters, then when calculating, there should be no entry for centimeter capacities in the relevant fields ； Tank parameter measurement process 1. Obtain the liquid level value ； 2. Obtain the temperature value ； 3. Obtain vt ； 4. Manually enter the test temperature and test density ； 5. Automatically calculate standard density ； 6. VCFs are obtained from 2 and 5 ； 7. g = (p20 – 0.0011) * vcf * vt ； Tank parameter display: 1. Measured liquid level ； 2. Measure temperature ； 3. Measure volume ； 4. Test temperature ； (Artificial input) 5. Test density ； (Artificial input) 6. Standard density ； 7. Volume correction factor vcf ； 8. Standard volume: v20 = vt * vcf ； 9. Actual density: pt = (p20 – 0.0011) * vcf ； 10. Weight: g = (p20 – 0.0011) * vcf * vt ； 11. Parameter relationship diagram: omitted.
3. With the standard density of 770.0 kg/m3 and the transportation temperature of 40°C, Table 60B is used to find that VCF20 = 0.9775; therefore, V20 = 1240.62 * 0.9775 ≈ 1212.706 m3. The mass of oil transported is equal to 1212.706 * (770.0 – 1.1) ≈ 932449.6 kg, or approximately 932.450 tons.
4. Using ρ20 = 770.0 kg/m3, Table E1 is consulted to obtain ρ15 = 774.3 kg/m3. Then, Table E3 is used with this value to determine that the coefficient in barrels per ton is 8.140 barrels/ton. Thus, the number of barrels required is equal to the mass of oil transported multiplied by this coefficient: 932.450 * 8.140 ≈ 7590.1 barrels.
5. For convenience, Tables E1 – for converting the density of the product from 20°C to 15°C, Table E2 – for converting the density from 15°C to 20°C, Table E3 – for converting the density to a coefficient in barrels per ton, and Table E4 – for converting units – have been prepared. Standard density calculation method 1: Experimental temperature: also known as the temperature in the cup, it refers to the temperature of the sample in the experimental cup as measured in the laboratory after the sampler retrieves the sample ； 2. Experimental density: Also known as apparent density, it refers to the actual density of the sample in the testing vessel, as measured in the laboratory after the sample is obtained by the tester ； 3. Regarding Table 59b: This table is a standard density table; by referring to it based on the test temperature and test density, the standard density can be obtained. Our company has imported this table into an MDB database file; the name of the database file is syjlb.mdb, and the name of the 59b table is t_p20 ； 4. Standard density: Obtained from Table 59b by referring to the experimental temperature and experimental density; this is the standard density P20 ； VCF calculation method 1: Definition: Volume correction factor, which is used to convert the volume measured at the time of measurement into a standard volume ； v20 = vt * vcf ； 2. vcf: Obtain vcf by referring to the 60b table based on the current measurement temperature and standard density ； 3. Regarding Table 60b: This is a VCF table; by referring to it along with the measured temperature and standard density, the volume correction factor VCF can be obtained. Our company has imported this table into an MDB database file; the name of the database file is syjlb.mdb, and the name of the 60b table is t_vcf ； Weight calculation method: 1. Using the national standard formula: g = (p20 – 0.0011) * vcf * vt ； 2. Parameter overview: (1) p20: Standard density; for detailed calculation methods, see Section II. (2) 0.0011: Air weight of the product after measurement ； (3) vcf: Volume correction factor; for the detailed calculation method, see Section III. (4) vt: Measured volume of the product, which is obtained by referring to the volume table based on the liquid level height ； For the detailed calculation method, see «5» ； Method for calculating VT (actual volume): 1. Principle: Any value of a container (oil tank) within its safe height range corresponds to a unique volume value ； The unit for liquid level height is millimeters, while the unit for volume is generally liters ； The table required for calculations by the program is the “millimeter capacity table”. After obtaining the height, the program uses SQL statements to calculate the volume: “select tiji from where yewei=”. 2. Types of capacity tables: (1) Decimeter capacity table: This is the most common type; the unit used to measure the liquid level in this table is decimeters. For example, for a tank that is 10 meters high, its decimeter-based table will contain 100 rows of values ； (2) Centimeter capacity scale: (3) Millimeter capacity scale: Ordinary customers do not provide the millimeter capacity scale directly; we calculate it ourselves based on the capacity scale data provided by the user ； 3. Concept of ladder range: (1) When measuring the volume of oil in barrel-shaped tanks, since the capacity in cubic centimeters or millimeters remains constant (or approximately constant) within a certain range, this range is referred to as a ladder range. Ideally, a tank should exhibit a linear relationship over its height range, but in reality such a linear relationship is not possible due to deformation; therefore, stepped rings are introduced to improve measurement accuracy ； 4. Types of tanks and methods for calculating volume: (1) Horizontal tanks ； It is generally used in generators and temporary storage areas. Horizontal tanks are considered irregular tanks, and the methods for measuring their volume are specified by the users ； Provide the formula or a detailed volume table, and then our company will generate a \"millimeter volume table\"” ； (2) Spherical tank: belongs to high-pressure tanks ； It belongs to the category of irregular tanks, and its volume measurement method is provided by the user ； Provide the formula or a detailed volume table, and then our company will generate a \"millimeter volume table\"” ； (3) Other irregular tanks: These are classified as irregular tanks, and their volume measurement methods are specified by the user ； Provide the formula or a detailed volume table, and then our company will generate a \"millimeter volume table\"” ； (4) Barrel tanks: These belong to the category of regular tanks, and this type is commonly used on site; the method for generating the \"millimeter capacity table\" for this type of tank will be explained in detail below ； 5. Method for generating the “millimeter capacity table” for barrel-shaped tanks: (1) Create a “master table” database file (mdb): as shown in the figure below; (2) Create a “rim” database file (mdb): in the same database file as (1) ； The number of fields to create is related to the number of turns ； (3) Create the database table for the millimeter capacity table: (4) Generation: Write a program to calculate the target value. Special cases: (1) If the capacity table does not have stepped rings, then interpolation is used directly for the calculations ； (2) The example mentioned above refers to a gauge with capacities in decimeters; if it is a gauge with capacities in centimeters, then when calculating, there should be no entry for centimeter capacities in the relevant fields ； Tank parameter measurement process 1. Obtain the liquid level value ； 2. Obtain the temperature value ； 3. Obtain vt ； 4. Manually enter the test temperature and test density ； 5. Automatically calculate standard density ； 6. VCFs are obtained from 2 and 5 ； 7. g = (p20 – 0.0011) * vcf * vt ； Tank parameter display: 1. Measured liquid level ； 2. Measure temperature ； 3. Measure volume ； 4. Test temperature ； (Artificial input) 5. Test density ； (Artificial input) 6. Standard density ； 7. Volume correction factor vcf ； 8. Standard volume: v20 = vt * vcf ； 9. Actual density: pt = (p20 – 0.0011) * vcf ； 10. Weight: g = (p20 – 0.0011) * vcf * vt ； 11. Parameter relationship diagram: omitted.
The website www.hn523.com offers tank measurement tools that can automatically retrieve VCF20 data
Standard encryption and VCF are generally obtained by looking up tables
I only found out about Hai Chuan now; it’s not too late, I’ll study hard*