SY 5669-1993 Regulations for the transfer and measurement of vertical metal tanks for petroleum and liquid petroleum products
Some standard content:
8—-10 7AS
2. Measuring instruments and reagents
3. Measuring operation method
4. Oil volume calculation
5. Precautions
(952
Standard of the Ministry of Petroleum Industry of the People's Republic of China Measuring Procedures for Handover of Vertical Metal Tanks for Petroleum and Liquid Petroleum Products
SYL01-83
This procedure is applicable to the handover measurement of selected rows of petroleum and liquid petroleum products (hereinafter referred to as products) stored underground in a static state using Changle vertical metal tanks.
When implementing this procedure, the relevant provisions of the "Measurement Management Measures for Handover of Petroleum and Liquid Petroleum Products" issued by the Ministry of Petroleum Industry must be implemented. 1. General Principles
1.1 Measuring Accuracy
The error of oil product delivery measurement carried out according to this procedure is 0.35%. 1.2 Container Verification
1.2.1 The verification of the volume of vertical metal tanks shall be carried out in accordance with JG168-76 "Vertical Metal Tank Volume Verification Procedure".
1.2.2 The verification period of vertical metal tank volume: three years for the initial inspection and five years for the re-inspection.
1.2.3 The vertical metal tank used for product measurement shall be verified by major container verification stations approved by the Ministry of Petroleum Industry. 951
2.1 Measuring ruler
2. Measuring instruments and reagents
2.1.1 The oil dipstick shall be a steel tape measure. The length of the ruler can be selected according to the size of the tank. There are 10 meters, 15 meters, 20 meters = various specifications. The minimum scale is 1 mm and it is accompanied by a factory qualified certificate. 2.1.2 The dipstick hammer should be made of copper. A 500g dipstick hammer is used to measure light oil products; a 100g dipstick chain is used to measure source oil and heavy oil products. 2.1.3 The water measuring ruler should use a pin ruler or an aluminum alloy ruler. The length of the ruler is 30% mm, the minimum scale is 1 mm, and the total length error is within 20.5 mm: 2.1.4 The ruler should be calibrated once every six months. Its technical conditions should comply with the provisions of the "JC4-8G Steel Tape Calibration Regulations"
2.1.5 The ruler is prohibited from use if it falls into any of the following conditions: The ruler is twisted, bent, or welded:
5. The scale of the ruler becomes unclear or the numbers fall off: c. The tip of the hammer is damaged;
d. The scale error of the ruler exceeds the allowable range
e. No calibration table.
2.2 Thermometer
2.2.1 Thermometers used to measure oil temperature are generally rod-shaped fully immersed mercury thermometers with a minimum graduation value of 0.2°C, and are accompanied by factory certificates and calibration tables.
2.2.2 Mercury hygrometers should be calibrated once every six months. Their technical conditions should comply with the provisions of GB514--Technical conditions for liquid thermometers for testing 65% petroleum products. 2.2.3 Mercury thermometers that fall into any of the following conditions are prohibited from use. a. The mercury column in the capillary tube is broken. 952
b. The temperature sensing bulb has cracks
c. The scale is unclear and the paint is falling off;
d. The scale error exceeds the allowable range
e. No calibration table.
2.2.4 The use of other types of thermometers must meet the following conditions a. Pass the official national signature and be listed as a finalized product; b. Have the corresponding verification procedures or technical conditions and be able to implement periodic verification C. The measurement accuracy should be able to reach the same level of accuracy as the mercury thermometer with a minimum graduation value of 0.2°C
d. The use of thermal-electric conversion temperature cards (such as semiconductor thermometers, etc.) must be explosion-proof products, and have explosion-proof grade marks and explosion-proof certificates. The wiring between the sensor and the display instrument should meet the requirements of explosion-proof and shielding. 2.3 Densitometer
2.3.1 The density meter used to measure the density of oil products should be a SY-I type petroleum density meter.
2.3.2 The measurement range of the petroleum density meter should comply with the provisions of GB1884-80 "Determination of Density of Petroleum and Liquid Petroleum Products (Densitometer Method)". 2.3.3 The petroleum density meter should be calibrated once every six months. Its technical conditions shall comply with the provisions of SY3301-74 "Technical Conditions for Petroleum Densitometers" 2.4 Temperature measuring box
2.4.1 The temperature measuring box shall be made of copper or lead alloy materials 2.4.2 The capacity of the temperature measuring box shall not be less than 200 ml 2.4.3 The pull rope of the temperature measuring box shall be made of materials that meet the anti-static requirements.
2.5 Sampler
2.5.1 The sampler shall be made of copper or aluminum alloy materials. 2.5.2 The weight of the sampler shall be 1.5~2 times the weight of the discharged liquid 953
2.5.3 The capacity of the sampler shall comply with the provisions of the "Petroleum Liquid Petroleum Product Sampling Law".
2.5.4 The requirements for the pull rope of the measuring instrument are the same as those for the pull rope of the temperature measuring box.
2.6 Test oil paste
The test oil paste shall meet the following requirements:
The test oil paste evenly applied on the ruler is immersed in 120* solvent gasoline at 15~20°C. The time for its color to change should not exceed 10 seconds, and the change in the indication after staying for 10 seconds and stopping for 20 seconds should not exceed 0.5 mm. 2.1 Test water paste
The test water paste shall meet the following requirements
The test water paste evenly applied on the water ruler is immersed in 15~20°C water. The time for its color to change should not exceed 5 seconds, and the change in the indication after staying for 5 seconds should not exceed 0.5 mm.
3. Measurement operation method
3.1 Operation sequence
Before the handover of products: first check the ruler, then measure the temperature and take samples. After the oil products are handed over: check the back gauge and measure the temperature
3.2 Check the gauge
3.2.1 Terminology
Meeting, Gauge point: the designated place to lower the gauge from the top of the oil tank, b. Gauge total height: the vertical distance from the gauge point to the tank bottom (or gauge table) C. Before the oil product is handed over: measure the vertical distance from the surface of the filter tank to the tank bottom (or gauge table) before the oil product is handed over.
d. After the gauge: measure the vertical distance from the liquid surface in the oil tank to the tank bottom (or gauge table) after the oil product is handed over.
e. Check the gauge, measure the vertical distance from the liquid surface in the tank to the bottom (or gauge table). i. Check the empty gauge, measure the vertical distance from the gauge point to the liquid surface in the tank. g. Oil mark, the boundary mark left by the oil product on the oil dipstick. s. Water mark: the boundary mark left by the bottom water on the water dipstick surface. 3.2.2 Liquid level stabilization time
Before picking up the ruler, the liquid level in the tank should be stable for no less than 30 minutes. 3.2.3 Measure the ruler
When picking up the ruler, the ruler should be lowered at the measuring point on the top of the tank.
3.2.4 Check the ruler
3.2.4.1 For measuring light oil and lubricating oil, the ruler should be checked. 3.2.4.2 When checking the ruler, the following should be done: the ruler should be lowered steadily, the bottom should be touched lightly, and the reading should be accurate; read the decimal first, then the large number, and keep a record. 3.2.4.3 Repeat 3.2.4.2 for the second ruler check. The difference between the two ruler readings should not exceed 1 mm, and the first ruler reading shall prevail; if it exceeds 1 mm, the ruler should be re-checked.
3.2.4.4 When measuring the liquid level of volatile light oil, if the oil is not clear, you can apply oil test paste to check the ruler.
3.2.5 Checking the empty gauge
3.2.5.1 For measuring crude oil, heavy oil, fuel oil and other heavy oil products, the empty gauge should be checked.
3.2.5.2 When the tape is immersed in the oil, stop lowering the tape and align the scale of the tape measure with the pick-up point. After it stabilizes, read the height of the lowered tape, lift the tape and read the height of the part immersed in the oil, and make a record.
3.2.5.3 Repeat the operation of 3.2.5.2 to check the gauge for the second time. If the difference between the two gauge readings does not exceed 1 mm, the first gauge reading shall be used as the reference. If it exceeds 1 mm, the gauge should be checked again.
3.2.5.4 When checking the empty gauge, the oil level is equal to the total gauge height minus the empty gauge height plus the immersed height.
3.2.6 Water gauge
3.2.6.1 The operation method of measuring the bottom water height in the tank is the same as that of the actual gauge. 3.2.6.2 The water gauge stays in the tank for 10 to 30 seconds. 3.2.6.3 When measuring the bottom water height, water test paste should be applied to the water gauge. 3.3 Temperature measurement
3.3.1 Oil tank temperature measurement
For measuring the temperature of petroleum products in the sludge, it is advisable to use the method of measuring the temperature in the oil marrow.
3.3.1.1 Before measuring the temperature, select a thermometer with an appropriate range and place it in the middle of the temperature measuring box, and lower the temperature measuring box from the gauge point to the temperature measuring position. 3.3.1.2 For oil products that do not need to be heated in the flower oil tank, the temperature should be measured once at 1/2 of the oil level in the tank. 3.3.1.3 For oil products that need to be heated in the oil tank: the temperature should be measured according to the following regulations. Then take the arithmetic mean of the measured temperatures as the average temperature of the oil.
a. When the oil level in the tank exceeds 1/2 of the total height of the gauge, measure the temperature once at 1/6, 1/2, and 5/6 of the tank level; b. When the oil level in the tank is lower than 1/2 of the total height of the gauge, measure the temperature once at 1/3 and 2/3 of the tank level. 3.3.1.4 The temperature measurement residence time is as follows: bzxZ.net
Light oil products shall not be less than 5 minutes;
Lubricating oil shall not be less than 7 minutes;
Crude oil, heavy oil, fuel oil, high-temperature lubricating oil, etc. shall not be less than 10 minutes. 3.3.1.5 When the temperature measuring box reaches the specified time in the medullary, quickly take it out and read the reading immediately (do not pour out the oil in the temperature measuring box at this time); when reading, the line of sight should be level with the temperature indication, read the decimal first, then the large number; keep a record. 958
3.3-2 Pipeline temperature measurement
For measuring crude oil temperature, it is advisable to use the method of measuring temperature in the oil pipeline! 3.3.2.1 The temperature measurement location should be close to the pump outlet. 3.3.2.2 Measure the temperature according to the following provisions, and then take the arithmetic mean of the measured temperatures each time as the average temperature of the oil product. a. If the total oil delivery time does not exceed 2 hours, the temperature should be measured 10 minutes after the oil in the tank flows through the temperature measuring point at the beginning of oil delivery, in the middle time and 10 minutes before the end of oil delivery: drink
b. If the total oil delivery time is 2~24 hours, the temperature should be measured once 10 minutes after the oil in the tank flows through the temperature measuring point at the beginning of oil delivery, and once every 1 hour thereafter. c. If the total oil delivery time exceeds 24 hours, the temperature should be measured once 10 minutes after the oil in the tank flows through the temperature measuring point at the beginning of oil delivery, and once every 2 hours thereafter. 3.4 Joint sampling
3.4.1 Oil tank sampling
The sample of liquid petroleum products should be taken in the oil tank. The joint sampling method shall be implemented in accordance with SY2001-77 Petroleum Product Sampling Method 3.4.1.1 Before sampling, the sampler should be rinsed once with the oil to be sampled. 3.4.1.2 Lower the agitator to the sampling position in the tank, pull open the wooden plug of the sampler, wait for it to be filled with oil sample, then take out the sampler and pour the oil sample into a clean bottle with a label.
3.4.2 Pipeline sampling
For taking crude oil samples, it is advisable to adopt the method of sampling in the transport pipe. 3.4.2.1 The sampling position should be close to the pump outlet. 3.4.2.2 The installation requirements of the sampling tube are as follows: a. It should be installed horizontally on a vertical pipeline or horizontally at 90 degrees in the fluid condensation zone of a horizontal pipeline (Reynolds number Re>2000); b. The 45° slope of the sampling tube inlet should face the direction of fluid flow, and the midpoint of the slope of the inlet 957
end should be located at 1/3 of the pipe diameter; c. The exposed part of the sampling tube should be as short as possible.
3.4.2.3 Take time-proportional samples from the pipeline sampler according to the following provisions, and then mix the samples taken each time into an interval sample in equal volumes. a. If the total oil transportation time does not exceed 2 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, the middle time and 10 minutes before the end of the oil transportation.
b. If the total oil transportation time is 2-24 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, and take samples every 1 hour thereafter.
C. If the total oil transportation time exceeds 24 hours, take samples 13 minutes after the oil in the tank flows near the sampling point at the beginning of the oil transportation, and take samples every 2 hours thereafter. 3.4.2.4 Before taking samples, release some of the oil to be sampled, rinse the sampler, and then collect the samples in the test container or collector. 3.4.2.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the solidification of the oil. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be carried out in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For the samples taken, the density and temperature are measured. Each test is measured twice continuously. The density meter reading is estimated to 0.0001 g/cm, and the temperature is read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be carried out in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as weight percentage.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC to the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is calculated as follows:
Yt=(V +AVp-Vsx) ·[1+0.00036 (t20)
Where: 0.000036——the volume expansion coefficient of the steel tank (1/C)+—the temperature of the steel plate of the tank body, the value of which can be the oil temperature. 4.2.6 Calculate the standard volume (V20) of the oil at a temperature of 20°C. Ya=K·Yt
Where: K--the oil volume coefficient. Its value is obtained from Table ⅡA of GB1385-80 "Table of Petroleum Volume Coefficients".
4.2.7 Standard volume Vzo can also be calculated by the following formula: Vzu=Vt1-f(t-20))
Formula: [——Stone run volume temperature coefficient (1/℃), its value is obtained from Table ⅡB of CB1885-80 "Table of Petroleum Volume Temperature Coefficients". 4.2.8 In order to reduce the difference caused by different values of the two calculation formulas using K value and / value, the K value and / value used in the calculation should be calculated to the fifth decimal point. For these two calculation results, if there is any dispute, the result calculated using K value shall prevail.
4.3 Calculation of mass
When oil products are measured by weight in air, the influence of air buoyancy should be considered. Convert the mass in vacuum (M) to the weight in air (m). 4.3.1 The calculation formula for correction based on the air buoyancy correction value is: m= (p2~0.0011)V20
Formula: 0.c311-air buoyancy correction value of oil density (g/cm9) 4.3.2 The calculation formula for correction based on the air buoyancy correction coefficient is: m=p2a·Y20·F
Wherein: F is the air buoyancy correction coefficient. Its value is obtained by referring to Table IIIB (Conversion coefficient table of petroleum mass in vacuum to weight in air) of GB1885-80 according to the standard density of oil products. 4.3.3 If there is any dispute between the calculation results of formula (1) in 4.3.1 and formula (2) in 4.3.2, the calculation result of formula (2) in 4.3.2 shall prevail. 4.4 Measurement of pure oil content of crude oil
For the transfer measurement of crude oil, the water content in the crude oil should be deducted when calculating the oil volume. The calculation formula of pure oil content of crude oil is as follows: m. = m.(1-W)
Where: m. - pure oil weight of crude oil:
m - - weight of mixed crude oil:
A - water weight percentage of original sample 5. Notes
5.1 Check whether the measuring instruments and reagents are in good condition and prepare records. 5.2 Before measuring, the metering personnel should understand the oil filling status of the oil tank to be measured.
5.3 When measuring the liquid level of highly volatile light oil products, chalk and other substances are not allowed to be smeared on the dipstick.
5.4 When measuring the bottom water height in the tank, water test paper is not allowed. 5.5 When operating the tank, the metering personnel should stand in the upwind direction. 5.6 Measuring When personnel operate on the tank, measures to eliminate static electricity must be taken. 5.7 Explosion-proof lamps should be used for lighting. 5.8 The measuring area of the oil tank should be lined with metal that does not produce sparks. 5.9 Do not wear spiked shoes or clothing made of artificial fibers when operating on the tank. Additional notes: This regulation was proposed by the Transportation and Marketing Department of the Ministry of Petroleum Industry and is under the jurisdiction of the Ministry of Petroleum Industry. The "Measurement Regulations for the Transfer of Petroleum and Liquid Petroleum Products" Compilation Group is responsible for the compilation. This standard continued to be effective after the review in 199, and the review results have been approved by the State Administration of Petroleum and Chemical Industry.3-2 Pipeline temperature measurement
For measuring crude oil temperature, it is advisable to use the method of measuring temperature in the oil pipeline! 3.3.2.1 The temperature measurement location should be close to the pump outlet. 3.3.2.2 Carry out temperature measurement according to the following provisions, and then take the arithmetic mean of the measured temperatures as the average temperature of the oil. a. If the total oil transportation time does not exceed 2 hours, the temperature should be measured 10 minutes after the oil in the tank flows through the temperature measurement point at the beginning of oil transportation, in the middle time and 10 minutes before the end of oil transportation: drink
b. If the total oil transportation time is 2~24 hours, the temperature should be measured once 10 minutes after the oil in the tank flows through the temperature measurement point at the beginning of oil transportation, and once every 1 hour thereafter. c. If the total oil transportation time exceeds 24 hours, the temperature should be measured once 10 minutes after the oil in the tank flows through the temperature measurement point at the beginning of oil transportation, and once every 2 hours thereafter. ：3.4 Joint sampling
3.4.1 Oil tank sampling
For the sample of liquid petroleum products, it is advisable to take the sample in the oil tank. The joint sampling method shall be implemented in accordance with SY2001-77 Petroleum Product Sampling Method. 3.4.1.1 Before sampling, the sampler should be rinsed once with the oil product to be sampled. 3.4.1.2 Lower the agitator to the sampling position in the tank, pull out the wooden plug of the sampler, wait for it to be filled with oil sample, then take out the sampler and pour the oil sample into a clean bottle with a label.
3.4.2 Pipeline sampling
For the sample of crude oil, it is advisable to adopt the method of sampling in the pipeline. 3.4.2.1 The sampling location should be close to the pump outlet. 3.4.2.2 The installation requirements for the sampling tube are as follows: a. It should be installed horizontally on a vertical pipeline or horizontally at an angle of 90° in the fluid condensation zone of a horizontal pipeline (Reynolds number Re>2000); b. The 45° slope of the sampling tube inlet should face the direction of fluid flow, and the midpoint of the slope at the inlet end should be located at 1/3 of the pipe diameter; c. The exposed portion of the sampling tube should be as short as possible.
3.4.2.3 Take time-proportional samples from the pipeline sampler according to the following provisions, and then mix the samples taken each time into an interval sample in equal volumes. a. If the total oil transportation time does not exceed 2 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, the middle time and 10 minutes before the end of the oil transportation.
b. If the total oil transportation time is 2-24 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, and take samples every 1 hour thereafter.
C. If the total oil transportation time exceeds 24 hours, take samples 13 minutes after the oil in the tank flows near the sampling point at the beginning of the oil transportation, and take samples every 2 hours thereafter. 3.4.2.4 Before taking samples, release some of the oil to be sampled, rinse the sampler, and then collect the samples in the test container or collector. 3.4.2.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the solidification of the oil. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be carried out in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For the samples taken, the density and temperature are measured. Each test is measured twice continuously. The density meter reading is estimated to 0.0001 g/cm, and the temperature is read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be carried out in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as weight percentage.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC to the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is calculated as follows:
Yt=(V +AVp-Vsx) ·[1+0.00036 (t20)
Where: 0.000036——the volume expansion coefficient of the steel tank (1/C)+—the temperature of the steel plate of the tank body, the value of which can be the oil temperature. 4.2.6 Calculate the standard volume (V20) of the oil at a temperature of 20°C. Ya=K·Yt
Where: K--the oil volume coefficient. Its value is obtained from Table ⅡA of GB1385-80 "Table of Petroleum Volume Coefficients".
4.2.7 Standard volume Vzo can also be calculated by the following formula: Vzu=Vt1-f(t-20))
Formula: [——Stone run volume temperature coefficient (1/℃), its value is obtained from Table ⅡB of CB1885-80 "Table of Petroleum Volume Temperature Coefficients". 4.2.8 In order to reduce the difference caused by different values of the two calculation formulas using K value and / value, the K value and / value used in the calculation should be calculated to the fifth decimal point. For these two calculation results, if there is any dispute, the result calculated using K value shall prevail.
4.3 Calculation of mass
When oil products are measured by weight in air, the influence of air buoyancy should be considered. Convert the mass in vacuum (M) to the weight in air (m). 4.3.1 The calculation formula for correction based on the air buoyancy correction value is: m= (p2~0.0011)V20
Formula: 0.c311-air buoyancy correction value of oil density (g/cm9) 4.3.2 The calculation formula for correction based on the air buoyancy correction coefficient is: m=p2a·Y20·F
Wherein: F is the air buoyancy correction coefficient. Its value is obtained by referring to Table IIIB (Conversion coefficient table of petroleum mass in vacuum to weight in air) of GB1885-80 according to the standard density of oil products. 4.3.3 If there is any dispute between the calculation results of formula (1) in 4.3.1 and formula (2) in 4.3.2, the calculation result of formula (2) in 4.3.2 shall prevail. 4.4 Measurement of pure oil content of crude oil
For the transfer measurement of crude oil, the water content in the crude oil should be deducted when calculating the oil volume. The calculation formula of pure oil content of crude oil is as follows: m. = m.(1-W)
Where: m. - pure oil weight of crude oil:
m - - weight of mixed crude oil:
A - water weight percentage of original sample 5. Notes
5.1 Check whether the measuring instruments and reagents are in good condition and prepare records. 5.2 Before measuring, the metering personnel should understand the oil filling status of the oil tank to be measured.
5.3 When measuring the liquid level of highly volatile light oil products, chalk and other substances are not allowed to be smeared on the dipstick.
5.4 When measuring the bottom water height in the tank, water test paper is not allowed. 5.5 When operating the tank, the metering personnel should stand in the upwind direction. 5.6 Measuring When personnel operate on the tank, measures to eliminate static electricity must be taken. 5.7 Explosion-proof lamps should be used for lighting. 5.8 The measuring area of the oil tank should be lined with metal that does not produce sparks. 5.9 Do not wear spiked shoes or clothing made of artificial fibers when operating on the tank. Additional notes: This regulation was proposed by the Transportation and Marketing Department of the Ministry of Petroleum Industry and is under the jurisdiction of the Ministry of Petroleum Industry. The "Measurement Regulations for the Transfer of Petroleum and Liquid Petroleum Products" Compilation Group is responsible for the compilation. This standard continued to be effective after the review in 199, and the review results have been approved by the State Administration of Petroleum and Chemical Industry.3-2 Pipeline temperature measurement
For measuring crude oil temperature, it is advisable to use the method of measuring temperature in the oil pipeline! 3.3.2.1 The temperature measurement location should be close to the pump outlet. 3.3.2.2 Carry out temperature measurement according to the following provisions, and then take the arithmetic mean of the measured temperatures as the average temperature of the oil. a. If the total oil transportation time does not exceed 2 hours, the temperature should be measured 10 minutes after the oil in the tank flows through the temperature measurement point at the beginning of oil transportation, in the middle time and 10 minutes before the end of oil transportation: drink
b. If the total oil transportation time is 2~24 hours, the temperature should be measured once 10 minutes after the oil in the tank flows through the temperature measurement point at the beginning of oil transportation, and once every 1 hour thereafter. c. If the total oil transportation time exceeds 24 hours, the temperature should be measured once 10 minutes after the oil in the tank flows through the temperature measurement point at the beginning of oil transportation, and once every 2 hours thereafter. ：3.4 Joint sampling
3.4.1 Oil tank sampling
For the sample of liquid petroleum products, it is advisable to take the sample in the oil tank. The joint sampling method shall be implemented in accordance with SY2001-77 Petroleum Product Sampling Method. 3.4.1.1 Before sampling, the sampler should be rinsed once with the oil product to be sampled. 3.4.1.2 Lower the agitator to the sampling position in the tank, pull out the wooden plug of the sampler, wait for it to be filled with oil sample, then take out the sampler and pour the oil sample into a clean bottle with a label.
3.4.2 Pipeline sampling
For the sample of crude oil, it is advisable to adopt the method of sampling in the pipeline. 3.4.2.1 The sampling location should be close to the pump outlet. 3.4.2.2 The installation requirements for the sampling tube are as follows: a. It should be installed horizontally on a vertical pipeline or horizontally at an angle of 90° in the fluid condensation zone of a horizontal pipeline (Reynolds number Re>2000); b. The 45° slope of the sampling tube inlet should face the direction of fluid flow, and the midpoint of the slope at the inlet end should be located at 1/3 of the pipe diameter; c. The exposed portion of the sampling tube should be as short as possible.
3.4.2.3 Take time-proportional samples from the pipeline sampler according to the following provisions, and then mix the samples taken each time into an interval sample in equal volumes. a. If the total oil transportation time does not exceed 2 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, the middle time and 10 minutes before the end of the oil transportation.
b. If the total oil transportation time is 2-24 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, and take samples every 1 hour thereafter.
C. If the total oil transportation time exceeds 24 hours, take samples 13 minutes after the oil in the tank flows near the sampling point at the beginning of the oil transportation, and take samples every 2 hours thereafter. 3.4.2.4 Before taking samples, release some of the oil to be sampled, rinse the sampler, and then collect the samples in the test container or collector. 3.4.2.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the solidification of the oil. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be carried out in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For the samples taken, the density and temperature are measured. Each test is measured twice continuously. The density meter reading is estimated to 0.0001 g/cm, and the temperature is read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be carried out in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as weight percentage.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC into the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is calculated as follows:
Yt=(V +AVp-Vsx) ·[1+0.00036 (t20)
Where: 0.000036——the volume expansion coefficient of the steel tank (1/C)+—the temperature of the steel plate of the tank body, the value of which can be the oil temperature. 4.2.6 Calculate the standard volume (V20) of the oil at a temperature of 20°C. Ya=K·Yt
Where: K--the oil volume coefficient. Its value is obtained from Table ⅡA of GB1385-80 "Table of Petroleum Volume Coefficients".
4.2.7 Standard volume Vzo can also be calculated by the following formula: Vzu=Vt1-f(t-20))
Formula: [——Stone run volume temperature coefficient (1/℃), its value is obtained from Table ⅡB of CB1885-80 "Table of Petroleum Volume Temperature Coefficients". 4.2.8 In order to reduce the difference caused by different values of the two calculation formulas using K value and / value, the K value and / value used in the calculation should be calculated to the fifth decimal point. For these two calculation results, if there is any dispute, the result calculated using K value shall prevail.
4.3 Calculation of mass
When oil products are measured by weight in air, the influence of air buoyancy should be considered. Convert the mass in vacuum (M) to the weight in air (m). 4.3.1 The calculation formula for correction based on the air buoyancy correction value is: m= (p2~0.0011)V20
Formula: 0.c311-air buoyancy correction value of oil density (g/cm9) 4.3.2 The calculation formula for correction based on the air buoyancy correction coefficient is: m=p2a·Y20·F
Wherein: F is the air buoyancy correction coefficient. Its value is obtained by referring to Table IIIB (Conversion coefficient table of petroleum mass in vacuum to weight in air) of GB1885-80 according to the standard density of oil products. 4.3.3 If there is any dispute between the calculation results of formula (1) in 4.3.1 and formula (2) in 4.3.2, the calculation result of formula (2) in 4.3.2 shall prevail. 4.4 Measurement of pure oil content of crude oil
For the transfer measurement of crude oil, the water content in the crude oil should be deducted when calculating the oil volume. The calculation formula of pure oil content of crude oil is as follows: m. = m.(1-W)
Where: m. - pure oil weight of crude oil:
m - - weight of mixed crude oil:
A - water weight percentage of original sample 5. Notes
5.1 Check whether the measuring instruments and reagents are in good condition and prepare records. 5.2 Before measuring, the metering personnel should understand the oil filling status of the oil tank to be measured.
5.3 When measuring the liquid level of highly volatile light oil products, chalk and other substances are not allowed to be smeared on the dipstick.
5.4 When measuring the bottom water height in the tank, water test paper is not allowed. 5.5 When operating the tank, the metering personnel should stand in the upwind direction. 5.6 Measuring When personnel operate on the tank, measures to eliminate static electricity must be taken. 5.7 Explosion-proof lamps should be used for lighting. 5.8 The measuring area of the oil tank should be lined with metal that does not produce sparks. 5.9 Do not wear spiked shoes or clothing made of artificial fibers when operating on the tank. Additional notes: This regulation was proposed by the Transportation and Marketing Department of the Ministry of Petroleum Industry and is under the jurisdiction of the Ministry of Petroleum Industry. The "Measurement Regulations for the Transfer of Petroleum and Liquid Petroleum Products" Compilation Group is responsible for the compilation. This standard continued to be effective after the review in 199, and the review results have been approved by the State Administration of Petroleum and Chemical Industry.1. Oil tank sampling
For samples of liquid petroleum products, it is advisable to sample them in the oil tank. The joint sampling method shall be implemented in accordance with SY2001-77 Petroleum Product Sampling Method. 3.4.1.1 Before sampling, the sampler should be flushed with the oil to be sampled. 3.4.1.2 Lower the agitator to the sampling position in the tank, pull out the wooden plug of the sampler, wait for it to be filled with oil sample, then take out the sampler and pour the oil sample into a clean bottle with a label.
3.4.2 Pipeline sampling
For crude oil samples, it is advisable to adopt the method of sampling in the pipeline. 3.4.2.1 The sampling location should be close to the pump outlet. 3.4.2.2 The installation requirements for the sampling tube are as follows: a. It should be installed horizontally on a vertical pipeline or horizontally at an angle of 90° in the fluid condensation zone of a horizontal pipeline (Reynolds number Re>2000); b. The 45° slope of the sampling tube inlet should face the direction of fluid flow, and the midpoint of the slope at the inlet end should be located at 1/3 of the pipe diameter; c. The exposed portion of the sampling tube should be as short as possible.
3.4.2.3 Take time-proportional samples from the pipeline sampler according to the following provisions, and then mix the samples taken each time into an interval sample in equal volumes. a. If the total oil transportation time does not exceed 2 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, the middle time and 10 minutes before the end of the oil transportation.
b. If the total oil transportation time is 2-24 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, and take samples every 1 hour thereafter.
C. If the total oil transportation time exceeds 24 hours, take samples 13 minutes after the oil in the tank flows near the sampling point at the beginning of the oil transportation, and take samples every 2 hours thereafter. 3.4.2.4 Before taking samples, release some of the oil to be sampled, rinse the sampler, and then collect the samples in the test container or collector. 3.4.2.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the solidification of the oil. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be carried out in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For the samples taken, the density and temperature are measured. Each test is measured twice continuously. The density meter reading is estimated to 0.0001 g/cm, and the temperature is read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be carried out in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as weight percentage.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC into the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface load volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is calculated as follows:
Yt=(V +AVp-Vsx) ·[1+0.00036 (t20)
Where: 0.000036——the volume expansion coefficient of the steel tank (1/C)+—the temperature of the steel plate of the tank body, the value of which can be the oil temperature. 4.2.6 Calculate the standard volume (V20) of the oil at a temperature of 20°C. Ya=K·Yt
Where: K--the oil volume coefficient. Its value is obtained from Table ⅡA of GB1385-80 "Table of Petroleum Volume Coefficients".
4.2.7 Standard volume Vzo can also be calculated by the following formula: Vzu=Vt1-f(t-20))
Formula: [——Stone run volume temperature coefficient (1/℃), its value is obtained from Table ⅡB of CB1885-80 "Table of Petroleum Volume Temperature Coefficients". 4.2.8 In order to reduce the difference caused by different values of the two calculation formulas using K value and / value, the K value and / value used in the calculation should be calculated to the fifth decimal point. For these two calculation results, if there is any dispute, the result calculated using K value shall prevail.
4.3 Calculation of mass
When oil products are measured by weight in air, the influence of air buoyancy should be considered. Convert the mass in vacuum (M) to the weight in air (m). 4.3.1 The calculation formula for correction based on the air buoyancy correction value is: m= (p2~0.0011)V20
Formula: 0.c311-air buoyancy correction value of oil density (g/cm9) 4.3.2 The calculation formula for correction based on the air buoyancy correction coefficient is: m=p2a·Y20·F
Wherein: F is the air buoyancy correction coefficient. Its value is obtained by referring to Table IIIB (Conversion coefficient table of petroleum mass in vacuum to weight in air) of GB1885-80 according to the standard density of oil products. 4.3.3 If there is any dispute between the calculation results of formula (1) in 4.3.1 and formula (2) in 4.3.2, the calculation result of formula (2) in 4.3.2 shall prevail. 4.4 Measurement of pure oil content of crude oil
For the transfer measurement of crude oil, the water content in the crude oil should be deducted when calculating the oil volume. The calculation formula of pure oil content of crude oil is as follows: m. = m.(1-W)
Where: m. - pure oil weight of crude oil:
m - - weight of mixed crude oil:
A - water weight percentage of original sample 5. Notes
5.1 Check whether the measuring instruments and reagents are in good condition and prepare records. 5.2 Before measuring, the metering personnel should understand the oil filling status of the oil tank to be measured.
5.3 When measuring the liquid level of highly volatile light oil products, chalk and other substances are not allowed to be smeared on the dipstick.
5.4 When measuring the bottom water height in the tank, water test paper is not allowed. 5.5 When operating the tank, the metering personnel should stand in the upwind direction. 5.6 Measuring When personnel operate on the tank, measures to eliminate static electricity must be taken. 5.7 Explosion-proof lamps should be used for lighting. 5.8 The measuring area of the oil tank should be lined with metal that does not produce sparks. 5.9 Do not wear spiked shoes or clothing made of artificial fibers when operating on the tank. Additional notes: This regulation was proposed by the Transportation and Marketing Department of the Ministry of Petroleum Industry and is under the jurisdiction of the Ministry of Petroleum Industry. The "Measurement Regulations for the Transfer of Petroleum and Liquid Petroleum Products" Compilation Group is responsible for the compilation. This standard continued to be effective after the review in 199, and the review results have been approved by the State Administration of Petroleum and Chemical Industry.1. Oil tank sampling
For samples of liquid petroleum products, it is advisable to sample them in the oil tank. The joint sampling method shall be implemented in accordance with SY2001-77 Petroleum Product Sampling Method. 3.4.1.1 Before sampling, the sampler should be flushed with the oil to be sampled. 3.4.1.2 Lower the agitator to the sampling position in the tank, pull out the wooden plug of the sampler, wait for it to be filled with oil sample, then take out the sampler and pour the oil sample into a clean bottle with a label.
3.4.2 Pipeline sampling
For crude oil samples, it is advisable to adopt the method of sampling in the pipeline. 3.4.2.1 The sampling location should be close to the pump outlet. 3.4.2.2 The installation requirements for the sampling tube are as follows: a. It should be installed horizontally on a vertical pipeline or horizontally at an angle of 90° in the fluid condensation zone of a horizontal pipeline (Reynolds number Re>2000); b. The 45° slope of the sampling tube inlet should face the direction of fluid flow, and the midpoint of the slope at the inlet end should be located at 1/3 of the pipe diameter; c. The exposed portion of the sampling tube should be as short as possible.
3.4.2.3 Take time-proportional samples from the pipeline sampler according to the following provisions, and then mix the samples taken each time into an interval sample in equal volumes. a. If the total oil transportation time does not exceed 2 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, the middle time and 10 minutes before the end of the oil transportation.
b. If the total oil transportation time is 2-24 hours, take samples 10 minutes after the oil in the tank flows through the sampling point at the beginning of the transportation, and take samples every 1 hour thereafter.
C. If the total oil transportation time exceeds 24 hours, take samples 13 minutes after the oil in the tank flows near the sampling point at the beginning of the oil transportation, and take samples every 2 hours thereafter. 3.4.2.4 Before taking samples, release some of the oil to be sampled, rinse the sampler, and then collect the samples in the test container or collector. 3.4.2.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the solidification of the oil. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be carried out in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For the samples taken, the density and temperature are measured. Each test is measured twice continuously. The density meter reading is estimated to 0.0001 g/cm, and the temperature is read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be carried out in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as weight percentage.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC to the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is calculated as follows:
Yt=(V +AVp-Vsx) ·[1+0.00036 (t20)
Where: 0.000036——the volume expansion coefficient of the steel tank (1/C)+—the temperature of the steel plate of the tank body, the value of which can be the oil temperature. 4.2.6 Calculate the standard volume (V20) of the oil at a temperature of 20°C. Ya=K·Yt
Where: K--the oil volume coefficient. Its value is obtained from Table ⅡA of GB1385-80 "Table of Petroleum Volume Coefficients".
4.2.7 Standard volume Vzo can also be calculated by the following formula: Vzu=Vt1-f(t-20))
Formula: [——Stone run volume temperature coefficient (1/℃), its value is obtained from Table ⅡB of CB1885-80 "Table of Petroleum Volume Temperature Coefficients". 4.2.8 In order to reduce the difference caused by different values of the two calculation formulas using K value and / value, the K value and / value used in the calculation should be calculated to the fifth decimal point. For these two calculation results, if there is any dispute, the result calculated using K value shall prevail.
4.3 Calculation of mass
When oil products are measured by weight in air, the influence of air buoyancy should be considered. Convert the mass in vacuum (M) to the weight in air (m). 4.3.1 The calculation formula for correction based on the air buoyancy correction value is: m= (p2~0.0011)V20
Formula: 0.c311-air buoyancy correction value of oil density (g/cm9) 4.3.2 The calculation formula for correction based on the air buoyancy correction coefficient is: m=p2a·Y20·F
Wherein: F is the air buoyancy correction coefficient. Its value is obtained by referring to Table IIIB (Conversion coefficient table of petroleum mass in vacuum to weight in air) of GB1885-80 according to the standard density of oil products. 4.3.3 If there is any dispute between the calculation results of formula (1) in 4.3.1 and formula (2) in 4.3.2, the calculation result of formula (2) in 4.3.2 shall prevail. 4.4 Measurement of pure oil content of crude oil
For the transfer measurement of crude oil, the water content in the crude oil should be deducted when calculating the oil volume. The calculation formula of pure oil content of crude oil is as follows: m. = m.(1-W)
Where: m. - pure oil weight of crude oil:
m - - weight of mixed crude oil:
A - water weight percentage of original sample 5. Notes
5.1 Check whether the measuring instruments and reagents are in good condition and prepare records. 5.2 Before measuring, the metering personnel should understand the oil filling status of the oil tank to be measured.
5.3 When measuring the liquid level of highly volatile light oil products, chalk and other substances are not allowed to be smeared on the dipstick.
5.4 When measuring the bottom water height in the tank, water test paper is not allowed. 5.5 When operating the tank, the metering personnel should stand in the upwind direction. 5.6 Measuring When personnel operate on the tank, measures to eliminate static electricity must be taken. 5.7 Explosion-proof lamps should be used for lighting. 5.8 The measuring area of the oil tank should be lined with metal that does not produce sparks. 5.9 Do not wear spiked shoes or clothing made of artificial fibers when operating on the tank. Additional notes: This regulation was proposed by the Transportation and Marketing Department of the Ministry of Petroleum Industry and is under the jurisdiction of the Ministry of Petroleum Industry. The "Measurement Regulations for the Transfer of Petroleum and Liquid Petroleum Products" Compilation Group is responsible for the compilation. This standard continued to be effective after the review in 199, and the review results have been approved by the State Administration of Petroleum and Chemical Industry.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the oil from solidifying. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For all the samples taken, the density and temperature shall be measured. Each test shall be measured twice continuously. The density meter reading shall be estimated to 0.0001 g/cm, and the temperature shall be read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as a percentage by weight.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC to the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is calculated as follows:
Yt=(V +AVp-Vsx) ·[1+0.00036 (t20)
Where: 0.000036——the volume expansion coefficient of the steel tank (1/C)+—the temperature of the steel plate of the tank body, the value of which can be the oil temperature. 4.2.6 Calculate the standard volume (V20) of the oil at a temperature of 20°C. Ya=K·Yt
Where: K--the oil volume coefficient. Its value is obtained from Table ⅡA of GB1385-80 "Table of Petroleum Volume Coefficients".
4.2.7 Standard volume Vzo can also be calculated by the following formula: Vzu=Vt1-f(t-20))
Formula: [——Stone run volume temperature coefficient (1/℃), its value is obtained from Table ⅡB of CB1885-80 "Table of Petroleum Volume Temperature Coefficients". 4.2.8 In order to reduce the difference caused by different values of the two calculation formulas using K value and / value, the K value and / value used in the calculation should be calculated to the fifth decimal point. For these two calculation results, if there is any dispute, the result calculated using K value shall prevail.
4.3 Calculation of mass
When oil products are measured by weight in air, the influence of air buoyancy should be considered. Convert the mass in vacuum (M) to the weight in air (m). 4.3.1 The calculation formula for correction based on the air buoyancy correction value is: m= (p2~0.0011)V20
Formula: 0.c311-air buoyancy correction value of oil density (g/cm9) 4.3.2 The calculation formula for correction based on the air buoyancy correction coefficient is: m=p2a·Y20·F
Wherein: F is the air buoyancy correction coefficient. Its value is obtained by referring to Table IIIB (Conversion coefficient table of petroleum mass in vacuum to weight in air) of GB1885-80 according to the standard density of oil products. 4.3.3 If there is any dispute between the calculation results of formula (1) in 4.3.1 and formula (2) in 4.3.2, the calculation result of formula (2) in 4.3.2 shall prevail. 4.4 Measurement of pure oil content of crude oil
For the transfer measurement of crude oil, the water content in the crude oil should be deducted when calculating the oil volume. The calculation formula of pure oil content of crude oil is as follows: m. = m.(1-W)
Where: m. - pure oil weight of crude oil:
m - - weight of mixed crude oil:
A - water weight percentage of original sample 5. Notes
5.1 Check whether the measuring instruments and reagents are in good condition and prepare records. 5.2 Before measuring, the metering personnel should understand the oil filling status of the oil tank to be measured.
5.3 When measuring the liquid level of highly volatile light oil products, chalk and other substances are not allowed to be smeared on the dipstick.
5.4 When measuring the bottom water height in the tank, water test paper is not allowed. 5.5 When operating the tank, the metering personnel should stand in the upwind direction. 5.6 Measuring When personnel operate on the tank, measures to eliminate static electricity must be taken. 5.7 Explosion-proof lamps should be used for lighting. 5.8 The measuring area of the oil tank should be lined with metal that does not produce sparks. 5.9 Do not wear spiked shoes or clothing made of artificial fibers when operating on the tank. Additional notes: This regulation was proposed by the Transportation and Marketing Department of the Ministry of Petroleum Industry and is under the jurisdiction of the Ministry of Petroleum Industry. The "Measurement Regulations for the Transfer of Petroleum and Liquid Petroleum Products" Compilation Group is responsible for the compilation. This standard continued to be effective after the review in 199, and the review results have been approved by the State Administration of Petroleum and Chemical Industry.5 When taking high freezing point samples, pay attention to the insulation of the sampling pipe section! Prevent the oil from solidifying. When taking volatile samples, prevent the loss of light fractions. 3.5 Density determination
The method for determining the density of oil products shall be in accordance with GB1884-80 "Determination of density of petroleum and liquid petroleum products (density meter method)". For all the samples taken, the density and temperature shall be measured. Each test shall be measured twice continuously. The density meter reading shall be estimated to 0.0001 g/cm, and the temperature shall be read accurately to 0.2°C. 3.6 Determination of water content in crude oil
The method for determining the water content of crude oil shall be in accordance with GB260-77 "Determination of water content in petroleum products". The water content of the sample group taken shall be measured in parallel, and the arithmetic mean of the two results of the measurement shall be taken as the water content of the tested crude oil. The data shall be expressed as a percentage by weight.
4.1 Density conversion
4. Oil volume calculation
Convert the apparent density (pt) of the oil product measured by the densitometer at tC to the standard density (p20) in Table I of GB188.5--80. 4.2 Calculation of standard volume
4.2.1Convert the oil marrow volume table according to the oil height measured by the gauge to obtain the surface volume.
4.2.2Convert the oil tank volume table according to the water height measured by the gauge to obtain the tank bottom water volume Vwater
4.2.3Calculate the pressure volume increase value Vp
Where: AVp——the static pressure volume increase value of the oil in the tank, AVp*——the static pressure volume increase value of water D°-——the ratio of the standard density of the oil in the tank to the density of 4°℃ pure water (p value).
4.2.4 When the oil temperature differs from the standard temperature by no more than ±10°C, the oil volume (Vt) is calculated as follows:
Vt=V+'pV#*
4.2.5 When the oil temperature differs from the standard temperature by more than ±10°C, the oil volume (Vt) is
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