GB/T 19779-2005 Petroleum and liquid petroleum products — Calculation of oil quantities — Static measurement

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Card type: Test method

1. Method number / full title / English title / replacement relationship

• Standard number: GB/T 19779-2005
• Chinese full title: Petroleum and liquid petroleum products — Calculation of oil quantities — Static measurement
• English title: Petroleum and liquid petroleum products—Calculation of oil quantities—Static measurement
• Replacement relationship: not provided in the available source (the foreword states "this standard is formulated for the first time")
• Adoption status: Redrafted based on Chapter 12, Section 1 of the American Petroleum Institute (API) Manual of Petroleum Measurement Standards (MPMS), "Static Oil Quantity Calculation Part 1: Vertical Cylindrical Tanks and Tankers"; the degree of consistency is modified adoption; for clause numbering comparison see Appendix A (informative appendix)
• Publication/implementation: published on 2005-05-25, implemented on 2005-11-01

2. Scope of application and non-applicability

• Applicable to: calculation of static liquid quantities of crude oil, petroleum products and petrochemical products (hereinafter referred to as oil products) in oil storage containers; defines terms used in static oil quantity calculation; provides formulas for calculating certain correction coefficient values. The principle is that regardless of whether the basic data are collected manually or automatically, different users using the same basic data (tank capacity table, liquid level, density and temperature, etc.) can calculate consistent results.
• Applicable containers: vertical cylindrical tanks at atmospheric pressure, tankers, railway tank cars, horizontal cylindrical tanks, road tank cars and other oil storage containers.
• Not applicable/not included: calculation of oil quantities for wall-clinging oil, non-liquid substances, trace residual oil and oil-vapor space.
• Reference conditions: standard temperature 20 ℃, atmospheric pressure 101.325 kPa.

3. Method principle

No centrally stated "principle" chapter is provided in the available source. The standard follows the calculation chain of "basic data preparation (liquid level, oil temperature, density, water content, etc.) → calculate gross observed volume → calculate gross standard volume → sediment and water correction → calculate net standard volume → calculate apparent mass/mass", and provides formulas for each correction coefficient (CTSh, VCF, CSW, WCF, etc.). For the calculation flow see Appendix F.

4. Reagents and materials (purity / preparation)

Not provided in the available source (this standard is a calculation method standard and does not include a reagents and materials chapter).

5. Instruments and equipment

No centrally listed instruments and equipment chapter is provided in the available source. The measuring instruments/measurement methods involved in the main text include: dip tape, automatic level gauge, non-contact ATG (radar level gauge), inclinometer, portable temperature measuring device, surface thermometer, hydrostatic tank gauging system, etc. (scattered in Chapter 5, Appendix C, Chapter 12).

6. Recommended operating conditions

• Reference conditions: standard temperature 20 ℃, atmospheric pressure 101.325 kPa (Chapter 1).
• Numerical rounding: shall comply with GB/T 8170; when there are no other limiting factors, round according to the number of decimal places specified in Table 1; the data in Table 1 shall not be regarded as accuracy requirements for measuring instruments; when checking the consistency of the calculation method with this standard, the display and printing hardware shall have a binary word length of at least 32 bits or be able to display 10 digits (Chapter 4).
• Tank wall temperature calculation: for insulated tanks, T_s = T_L may be taken; for uninsulated tanks, according to formula (4) T_s = [(7×T_L)+T_a]/8 (6.1.4).
• Recommendations for ambient gas temperature measurement: a) a portable temperature measuring device is used to measure once or multiple times at a shaded position in the tank farm and take the average; b) a surface thermometer permanently installed at a shaded position in the tank farm; c) use local weather station data (5.7).

7. Sampling and sample preparation

• Sampling: to determine the density of the oil in the tank, compartment or transfer and the mass fraction or volume fraction of sediment and water, sampling shall be carried out according to the requirements of GB/T 4756 or ISO 3171 as required by the actual measurement, for laboratory analysis (5.4).
• Standard density: determine the standard density of the sample collected in Article 5.4 according to GB/T 1884, GB/T 13377 or SH/T 0604, so as to finally obtain a standard density representative of the oil in the tank (5.5).
• Sediment and water (SW%): according to the oil product category and trade agreement, determine the mass fraction or volume fraction of water according to GB/T 260 or GB/T 8929, and determine the mass fraction or volume fraction of sediment according to GB/T 6531; the sum of the two is taken as the mass fraction and volume fraction of sediment and water; in addition, according to GB/T 6533, the mass fraction or volume fraction of water and sediment in crude oil can also be determined in one test (5.6).

8. Analytical procedure

8.1 Basic data preparation (Chapter 5)

• 5.1 Capacity table: the oil storage container has been calibrated according to the corresponding standard and has a capacity table meeting the standard requirements. The calibration standards for vertical tanks, horizontal tanks, railway tank cars, road tank cars and tankers shall respectively be GB/T 13235.1～GB/T 13235.3 (or JJG 168), GB/T 17605 (or JJG 266), JJG 140, JJG 133 and MPMS Chapter 2 (Section 8A) (or JJG 702).
• 5.2 Oil product height: accurately measure and record the actual height or ullage of the oil product according to GB/T 13894 or other automatic measurement methods meeting the accuracy requirements; at the same time, the total height of the gauge hatch in the service state and the total height of the gauge hatch indicated on the capacity table shall be measured and recorded as required by actual needs. If free water and sediment exist at the bottom of the container, the heights of free water and bottom sediment shall be measured and recorded.
• 5.3 Measurement temperature: measure and record according to GB/T 8927 or other automatic measurement methods meeting the accuracy requirements, and finally obtain the average measurement temperature of the oil in the tank or compartment.
• 5.7 Ambient air temperature: see Section 6.
• 5.8 Additional data for tankers: a) forward draft reading; b) aft draft reading; c) list.

8.2 Calculation of gross observed volume (Chapter 6)

• 6.1 Vertical cylindrical tanks: according to formula (1) V_go = [(V_to − V_fw) × CTSh] − V_frd. For floating roof tanks, the floating roof displacement volume V_frd shall be deducted; in China, mass is usually used as the basis for settlement of bulk oil products, so the floating roof displacement is also deducted by mass, that is, the last subtraction term in formula (1) is omitted, but in this case V_go includes the floating roof displacement volume and does not have the actual meaning of oil product volume, and is only used as an intermediate variable in oil quantity calculation.
  • 6.1.2 Total observed volume: use the oil product height measured by 5.2 to look up the tank capacity table and obtain the calibrated volume at the corresponding height. When the tank capacity table is compiled separately according to empty tank volume and liquid hydrostatic expansion volume, calculate according to formula (2) V_to = V_t + ΔV_t × ρ_w/ρ_t. V_t is the empty tank volume; ΔV_t is the volume expansion value obtained from the liquid hydrostatic pressure volume correction table; ρ_t is the calibration liquid density used when compiling the hydrostatic pressure volume correction table, usually the density of water; ρ_w is the measured density of the working liquid during tank operation, which can be obtained by multiplying the standard density ρ_20 by the volume correction factor VCF at the measurement temperature. For the actual liquid height measured directly or indirectly by dip tape or automatic level gauge, the influence of oil product temperature on the dip tape reading and the total height of the gauge hatch shall be considered; before using the liquid height to look up the tank capacity table, correction shall be made by referring to the method recommended in Appendix C.
  • 6.1.3 Deduction of free water (FW) and tank bottom sediment: before and after oil transfer, the quantities of free water and tank bottom sediment shall be determined so as to make appropriate corrections to the gross observed volume. The volume to be deducted can be determined by using the depths of free water and sediment to look up the tank capacity table.
  • 6.1.4 Influence of tank wall temperature on calibrated volume (CTSh): according to formula (3) CTSh = 1 + 2α(T_s − 20). α is the linear expansion coefficient of the tank wall material (for low carbon steel take α = 0.000 012), ℃⁻¹; T_s is the tank wall temperature at the time of tank measurement, ℃. For insulated tanks T_s = T_L; for uninsulated tanks according to formula (4) T_s = [(7×T_L)+T_a]/8. Note: correcting the calibrated volume of the tank with the tank wall temperature correction factor is unrelated to the correction for calculating the volume expansion or contraction of the product itself; according to special needs, the tank wall temperature correction factor may also be compiled into the tank capacity table according to a specific working temperature.
  • 6.1.5 Floating roof correction: 6.1.5.1 usually the floating roof correction is not directly compiled into the tank capacity table, but is deducted later in the oil quantity calculation. 6.1.5.2 Deduction by volume: V_frd = m_fr / [WCF × VCF] (formula 5), m_fr is the apparent mass of the floating roof, and the unit of WCF shall correspond to the unit of the apparent mass of the floating roof. 6.1.5.3 Deduction by mass: when calculating the gross observed volume in a vertical cylindrical tank with a floating roof, the floating roof displacement volume may not be deducted, but the apparent mass of the floating roof is deducted when calculating the gross apparent mass of the oil product. Note: if the liquid level falls in the interval from the lowest point of the floating roof to the floating point, the floating roof correction is inaccurate, and the corresponding data are not suitable for measurement handover; the above floating roof correction is not applicable to oil quantity calculation below the lowest point of the floating roof.
• 6.2 Tankers: according to formula (6) V_go = V_to − V_fw; if the correction for tanker trim or list is a volume correction value, then according to formula (7) V_go = (V_to ± trim or list correction) − V_fw.
  • 6.2.2 Total observed volume V_to Three ways of looking up the table: when the trim and/or list correction is a volume adjustment, first use the measured ullage or actual height to look up the table to obtain V_to, and add the correction value to V_to; look up the table using the ullage or actual height corrected for trim and/or list to obtain V_to; some capacity tables already give V_to values varying with different trims at the same gauging height, and V_to can be obtained by looking up the table using the measured ullage or actual height and the tanker trim.
  • 6.2.3 Trim correction: The trim is expressed as the result of subtracting the forward draft reading from the aft draft reading. A positive trim (the aft draft reading is larger) is called "trim by the stern"; a negative trim (the forward draft reading is larger) is called "trim by the bow". The trim correction value may be positive or negative; the trim correction table specifies the specific use of the correction value; when the tank capacity table does not provide a trim correction value, it may be calculated by referring to formula (8) and Figure 1: S_r = S × √(D² + ... )/LBP − D × (T/LBP)² ± L × (T/LBP) (source-text extraction Doubt: the expression inside the radical in formula (8) source-text extraction is incomplete, requires confirmation against the source standard (source-text extraction)). D is the tank height measured from the reference point; S is the gauging height; L is the distance from the gauging hatch to the tank centerline; S_r is the trim-corrected gauging height; LBP is the length between perpendiculars; T is the tanker trim. When trimmed by the stern, the last term should be added at gauging positions offset from the centerline toward the bow, and subtracted toward the stern; when trimmed by the bow, the opposite applies. When the liquid level in the tank does not reach the forward end, a wedge shape is formed, and using the trim correction will no longer give the true gauging height; the volume of the wedge-shaped oil product may be calculated by referring to Appendix D.
  • 6.2.4 List correction: The tanker list value is usually read with an inclinometer; if there is no inclinometer or its accuracy is doubted, the list may be calculated from the draft readings at the port and starboard sides amidships. Example: port draft PA = 10.0 m, starboard draft SB = 12.0 m, hull width XY = 30.0 m, tanθ = (starboard draft − port draft)/hull width = (12.0−10.0)/30 = 0.066 7, θ = 4° (rounded to 0.5°), that is, the tanker is listed to starboard by 4°. The list correction value is used in the same way as the trim correction value; the list correction value may be positive or negative, and the list correction table specifies the specific use; when the tank capacity table does not provide a list correction value, it may be calculated by referring to Appendix E.
  • 6.2.5 Combined correction for list and trim: In most cases the two corrections are applicable only when one of them is absent, so list correction and trim correction should preferably not be used in combination; when both conditions exist, one of them should be eliminated as far as possible. For the calculation method of the combined correction, see Appendix E.
  • 6.2.6 Volume of free water: The volume may be obtained by looking up the tank capacity table using the actual height or ullage of the free water. Any liquid in the tank will be affected by trim and list; if the free water touches all tank walls, the trim and list corrections cited above also apply to it; if the free water does not touch all tank walls, the liquid in the tank exists as a wedge-shaped volume, and the above trim correction no longer applies. For the rules for determining whether a wedge-shaped volume exists, the application of wedge tables/formulas, and the calculation of wedge-shaped volume, see Appendix D or Chapter 17.4 of the American Petroleum Institute Manual of Petroleum Measurement Standards.
• 6.3 Horizontal metal tanks, railway tank cars and road tank cars: According to formula (9) V_go = [(V_to − V_fw) × CTSh]. The calibrated volume V_t of the tank at the corresponding height at standard temperature may be obtained by looking up the tank capacity table using the oil product height; if the oil product height lies between tabulated heights, interpolation may be used for calculation. For such small tanks, the expansion effect of liquid static pressure may be disregarded, and the total metered volume is approximately equal to the calibrated volume (V_to = V_t). The volumes of free water and bottom sediment are deducted by the same method as for 6.1.3. The correction coefficient for the effect of tank wall temperature on the calibrated volume and the tank wall temperature are determined by the same method as for vertical cylindrical tanks, and the liquid level measured by the gauging tape is corrected by referring to C.2.
• 6.4 Other containers: On the basis of obtaining the gross metered volume of the internal liquid V_go, continue the calculation from Chapter 7.

8.3 Calculation of gross standard volume (Chapter 7)

• 7.1 Volume correction factor: According to GB/T 1885, VCF is obtained by looking up the volume correction factor table for the corresponding oil product using the metering temperature of the oil product determined by 5.3 and the standard density determined by 5.5.
• 7.2 Gross standard volume: According to formula (10) V_gs = V_go × VCF.

8.4 Sediment and water (Chapter 8)

• According to formula (11) CSW = 1 − SW%. Unless required by trade or there are other special requirements, petroleum products are usually not corrected for sediment and water; in this case the net standard volume equals the gross standard volume. Note: SW% has two determination modes, volume fraction and mass fraction, and the choice of which to use should be based on whether the oil quantity calculation is based on volume or on mass.

8.5 Calculation of net standard volume (Chapter 9)

• According to formula (12) V_ns = V_gs × CSW; according to formula (13) V_sw = V_gs − V_ns. Note: If only the apparent mass of the oil product is ultimately required, the gross apparent mass m_g may also be calculated directly from the gross standard volume V_gs according to Section 10, and the net apparent mass m_n is obtained by deducting sediment and water from the gross apparent mass by mass fraction; this calculation step may be omitted.

8.6 Calculation of apparent mass (Chapter 10)

• 10.1 Overview: Multiplying V_gs or V_ns by WCF gives the gross apparent mass m_g or net apparent mass m_n of the oil product.
• 10.2 Floating roof displacement and sediment and water already deducted by volume: According to formula (14) m_n = V_ns × WCF.
• 10.3 Correction of floating roof displacement and sediment and water by mass: According to formula (15) m_g = V_gs × WCF − m_fr; according to formula (16) m_n = m_g × CSW; according to formula (17) m_sw = m_g − m_n.

8.7 Calculation of mass (mass in vacuum) (Chapter 11)

• For crude oil and its products, mass is usually preferably calculated by multiplying V_gs and V_ns by the standard density ρ_20. However, mass may also be calculated by multiplying the density at the same metering temperature by the volume; in this case the volume should be the gross metered volume V_go, and the density is generally calculated using VCF obtained by looking up the volume correction factor table in GB/T 1885 from the metering temperature and standard density, together with the standard density. Petrochemical products usually use the latter method to calculate quantity. Note: For petrochemical products, the density temperature coefficient should generally first be known or measured, and the density at the metering temperature is calculated from the density temperature coefficient and the known density, and then the mass is calculated.

8.8 Direct mass calculation (Chapter 12)

• Some metering methods determine mass by measuring liquid static pressure rather than liquid level, such as hydrostatic tank gauging systems. The calculation methods they use may include corrections for the effect of temperature on the liquid, the effect of liquid density on the floating roof, or the effect of temperature on the tank wall. In such cases, these corrections should not be repeated. For their calculation methods, see GB/T 18273.

8.9 Calculation sequence (Chapter 13)

• 13.1 Overview: If all the basic data required for calculating the net oil quantity are already available, one of the following calculation procedures may be selected according to the transfer agreement for the calculation. The methods for obtaining the basic data are outside the scope of this standard. During calculation, deductions not applicable to special occasions are taken as zero deductions, and any correction not applicable is fixed at 1.000 0. For the calculation flow of oil product inventory and transfer quantity, see Appendix F.
• 13.2 Volume-based calculation procedure: a) Look up the tank capacity table using the total oil and water height to obtain the total metered volume V_to; b) Deduct the free water volume V_fw obtained by looking up the tank capacity table using the free water height; c) Apply the correction coefficient CTSh for the effect of tank wall temperature to obtain the gross metered volume V_go; d) For floating roof tanks, the floating roof displacement volume V_frd should also be deducted from it; e) Correct the gross metered volume V_go to standard temperature to obtain the gross standard volume V_gs; f) Correct the gross standard volume V_gs with the correction value CSW for sediment and water (SW) to obtain the net standard volume V_ns; g) If the net apparent mass m_n of the oil product is required, it may be obtained by multiplying the net standard volume V_ns by the apparent mass conversion factor WCF.
• 13.3 Mass-based calculation procedure: a) Look up the tank capacity table using the total oil and water height to obtain the total metered volume V_to; b) Deduct the free water volume V_fw obtained by looking up the tank capacity table using the free water height; c) Apply the correction coefficient CTSh for the effect of tank wall temperature to obtain the gross metered volume V_go; d) Correct the gross metered volume V_go to standard temperature to obtain the gross standard volume V_gs; e) Multiply the gross standard volume V_gs by the apparent mass conversion factor WCF, then subtract the apparent mass of the floating roof m_fr to obtain the gross apparent mass m_g of the oil product; f) Correct the gross apparent mass m_g of the oil product with the correction value CSW for sediment and water (SW) to obtain the net apparent mass m_n of the oil product. Note: In the apparent-mass-based calculation procedure, because the floating roof displacement is deducted when calculating the gross apparent mass of the oil product, the gross metered volume and gross standard volume involved in c) and d) include the floating roof displacement volume. Dividing the net apparent mass m_n by the apparent mass conversion factor WCF gives the net standard volume V_ns indirectly.
• 13.4 Summary of oil quantity calculation formulas:
  • 13.4.1 Volume-based: V_gs = {[(V_to − V_fw) × CTSh] − V_frd} × VCF (formula 18); V_ns = V_gs × CSW; m_n = V_ns × WCF.
  • 13.4.2 Mass-based: m_g = {[(V_to − V_fw) × CTSh] × VCF × WCF} − m_fr (formula 19); m_n = m_g × CSW; V_ns = m_n/WCF (formula 20).
• 13.5 Rounding method: In the above steps for calculating the quantity of oil, only the final result of the oil quantity shall be rounded. If intermediate results must be reported, data rounding shall be carried out in accordance with the requirements of Chapter 5, but the rounded results shall not be inserted into the calculation process for use. For examples of oil quantity calculation for shore tanks and oil tankers, see Appendix F.

9. Qualitative and quantitative and calculation formulas

• Gross gauged volume (vertical cylindrical oil tank): V_go = [(V_to − V_fw) × CTSh] − V_frd (Formula 1)
• Total gauged volume (when the capacity table is compiled for an empty tank and hydrostatic expansion): V_to = V_t + ΔV_t × ρ_w/ρ_t (Formula 2)
• Tank wall temperature correction coefficient: CTSh = 1 + 2α(T_s − 20) (Formula 3)
• Tank wall temperature of uninsulated tank: T_s = [(7×T_L)+T_a]/8 (Formula 4)
• Floating roof displacement volume (deducted by volume): V_frd = m_fr / [WCF × VCF] (Formula 5)
• Oil tanker gross gauged volume: V_go = V_to − V_fw (Formula 6); V_go = (V_to ± trim or list correction) − V_fw (Formula 7)
• Trim correction (for actual height): S_r = S × √(D² + …)/LBP − D × (T/LBP)² ± L × (T/LBP) (Formula 8, source-text extraction unclear in the source text, requires confirmation against the source standard (source-text extraction))
• Gross gauged volume of horizontal metal tanks, railway tank cars and road tank cars: V_go = [(V_to − V_fw) × CTSh] (Formula 9)
• Gross standard volume: V_gs = V_go × VCF (Formula 10)
• Sediment and water correction coefficient: CSW = 1 − SW% (Formula 11)
• Net standard volume: V_ns = V_gs × CSW (Formula 12); V_sw = V_gs − V_ns (Formula 13)
• Net apparent mass (floating roof displacement and SW have been deducted by volume): m_n = V_ns × WCF (Formula 14)
• Gross apparent mass (floating roof displacement corrected by mass): m_g = V_gs × WCF − m_fr (Formula 15); m_n = m_g × CSW (Formula 16); m_sw = m_g − m_n (Formula 17)
• Summary (based on volume): V_gs = {[(V_to − V_fw) × CTSh] − V_frd} × VCF (Formula 18); V_ns = V_gs × CSW; m_n = V_ns × WCF
• Summary (based on mass): m_g = {[(V_to − V_fw) × CTSh] × VCF × WCF} − m_fr (Formula 19); m_n = m_g × CSW; V_ns = m_n/WCF (Formula 20)
• Gauge tape liquid level correction coefficient (Appendix C): F = 1 + α × (t_d − 20) (Formula C.1)
• Height of wedge-shaped oil liquid of bottom residual oil in tank (Appendix D): stern trim D_s = S + Y × T/LBP (Formula D.1); list D_s = S + (L_t − Y) × T/LBP (Formula D.2)
• Trim coefficient (Appendix D): V_w/V_d = D_s × LBP/(2 × T × L_t) (Formula D.3); ROB(OBQ) = V_s × V_w/V_d (Formula D.4)
• Oil tanker trim/list correction (Appendix E): UT = UM × [√(L²+T²)/L] ± (T/L)(L_T/2 − K) (Formula E.1); UT = (UM/cosθ) ± Z × tanθ (Formula E.2); combined correction UT = UM × √(L²+T²)/(L × cosθ) + Z × tanθ√(L²+V²)/L ± (T/L) × (L_T/2 − K) (Formula E.3) (source-text extraction unclear in the source text, requires confirmation against the source standard (source-text extraction))
• Apparent mass conversion coefficient WCF: equal to standard density minus air buoyancy correction value; this standard takes the air buoyancy correction value as 1.1 kg/m³, or 0.001 1 g/cm³ (3.11)

10. Precision

not provided in the available source (this standard does not include a precision chapter).

11. Report

Chapter 14 Measurement ticket (or report): The measurement ticket is a written document indicating the inventory, receipt and delivery quantities, and oil product gains and losses of an oil storage container. If during receipt and delivery operations the ownership or custody of the oil product in the oil storage container changes, the measurement ticket may serve as a document or voucher recording the receipt and delivery quantity of the oil product, and provide services for relevant units to verify the oil product quantity. Its technical content shall mainly include:

• Name and number of measuring instruments;
• Date and time of operation;
• Density of the oil product before and after operation;
• Sediment and water before and after operation;
• Liquid level height before and after operation;
• Free water height before and after operation;
• Oil product temperature and ambient temperature before and after operation;
• Volume of free water in the tank before and after operation;
• Net standard volume of the oil product inventory in the tank before and after operation;
• Net apparent mass of the oil product inventory in the tank before and after operation;
• Net standard volume and/or apparent mass of the received and delivered oil.

When filling in the measurement ticket, ensure that all copies are clearly visible. Unless agreed by both buyer and seller, alteration is prohibited. If an error occurs and needs correction, the measurement ticket shall be marked "void", and then a new ticket shall be prepared, and the void ticket shall be attached to the new ticket. Another commonly used alternative method is to prepare an adjustment ticket for the corrected difference.

12. Reference documents

• GB/T 260 Determination of water in petroleum products
• GB/T 1884 Laboratory determination of density of crude petroleum and liquid petroleum products (hydrometer method) (GB/T 1884-2000, eqv ISO 3675:1998)
• GB/T 1885 Petroleum measurement tables (GB/T 1885-1998, eqv ISO 91-2)
• GB/T 4756 Manual sampling of petroleum liquids (GB/T 4756-1998, eqv ISO 3170:1988)
• GB/T 6531 Determination of sediment in crude petroleum and fuel oils (extraction method) (GB/T 6531-1986, eqv ISO 3735:1975)
• GB/T 6533 Determination of water and sediment in crude petroleum (centrifuge method) (eqv ASTM D4007:1981)
• GB/T 8170 Rules for rounding off numerical values
• GB/T 8927 Determination of temperature of petroleum and liquid petroleum products
• GB/T 8929 Determination of water content in crude petroleum (distillation method) (eqv ASTM D4006:1981)
• GB/T 13235.1 Petroleum and liquid petroleum products — Calibration of vertical cylindrical metal tanks (strapping method) (GB/T 13235.1-1991, neq ISO/DIS 7507-1)
• GB/T 13235.2 Petroleum and liquid petroleum products — Calibration of vertical cylindrical metal tanks (optical reference line method) (neq ASTM D4738:1990)
• GB/T 13235.3 Petroleum and liquid petroleum products — Calibration of vertical cylindrical metal tanks (electro-optical internal distance-ranging method) (GB/T 13235.3-1995, neq ISO/DIS 7507-4)
• GB/T 13377 Determination of density or relative density of crude petroleum and liquid or solid petroleum products (capillary-stoppered pyknometer and graduated bicapillary pyknometer methods) (GB/T 13377-1992, neq ISO 3838:1983)
• GB/T 13894 Liquid level measurement of petroleum and liquid petroleum products (manual method) (neq API 2545-65:1987)
• GB/T 17605 Petroleum and liquid petroleum products — Calibration of horizontal cylindrical metal tanks (manual method) (neq API 2551:1997)
• GB/T 18273 Petroleum and liquid petroleum products — Direct static measurement of oil quantity in vertical tanks (HTG mass measurement method) (GB/T 18273-2000, eqv ISO 11223-1:1995)
• JJG 133 Trial verification regulation for capacity of road tank cars
• JJG 140 Verification regulation for volume of railway tank cars
• JJG 168 Trial verification regulation for capacity of vertical metal tanks
• JJG 266 Verification regulation for volume of horizontal metal tanks
• JJG 702 Trial verification regulation for capacity of ship liquid cargo measuring tanks
• SH/T 0604 Determination of density of crude petroleum and petroleum products (U-shaped vibrating tube method) (SH/T 0604-2000, eqv ISO 12185:1996)
• ISO/TR 8338 Responsibility for crude oil transfer — Estimation method for the amount of crude oil remaining on board ship
• ISO 3171 Petroleum liquids — Automatic pipeline sampling
• API MPMS Chapter 2 Tank calibration
• API MPMS Chapter 17 Oil tanker measurement

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick reference for questions and answers