GB/T 13236-2011 Petroleum and liquid petroleum products — Manual tank level measurement equipment
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Card type: Product standard
1. Standard number / full title / replacement relationship / publication and implementation
- Standard number: GB/T 13236—2011
- Chinese full title: Petroleum and liquid petroleum products — Manual tank level measurement equipment
- English title: Petroleum and liquid petroleum products—Equipment for measurement of liquid levels in storage tanks—Manual method
- Replacement relationship: replaces GB 13236—1991 "Technical conditions for petroleum gauging tapes and steel girth tapes"
- Adoption relationship: modified adoption of ISO 4512:2000 "Petroleum and liquid petroleum products — Level measurement equipment in tanks — Manual method" (English version), MOD
- Publication/implementation: published on 2011-07-29; implemented on 2011-11-01 (the original source-text extraction is "201[unreadable character]1[unreadable character]01 implementation", requires confirmation against the source standard (source-text extraction))
- Proposed by/under the jurisdiction of: proposed by the National Technical Committee for Standardization of Petroleum Products and Lubricants (SAC/TC 280); under the jurisdiction of the SAC/TC 280/SC 2 Subcommittee on Static Petroleum and Light Hydrocarbon Measurement
- Drafting organizations: Sinopec Research Institute of Petroleum Processing (responsible); Harbin Yongheng Measuring Instrument Co., Ltd., Wuxi Tengda Cold-Rolled Thin Strip Steel Plant (participating)
- Main drafters: Wei Jinxiang, Yang Shumin, Li Yidan, Yue Weidong
- Previous versions: GB 13236—1991
2. Scope of application and grade classification
- This standard specifies the types and technical conditions of equipment required for manually measuring the level or corresponding volume of petroleum and liquid petroleum products in tanks or other oil storage containers.
- This standard applies to the design, manufacture and use selection of manual level measurement equipment.
- Not applicable: not provided in the available source.
- Grade classification: not provided in the available source (this standard is an equipment technical conditions standard, not a product grade classification standard).
3. Technical requirements (indicator table, item by item: item | indicator | test method standard number)
3.1 Tape (Chapter 5)
| Item | Indicator | Test method standard number |
|---|---|---|
| Structure | Made from a continuous length of steel strip | not provided in the available source |
| Material - carbon content | High carbon content (carbon mass fraction approximately 0.8%) | not provided in the available source |
| Material - tensile strength | 1 600 N/mm²～1 850 N/mm² | not provided in the available source |
| Material - coefficient of linear expansion | (11±1)×10⁻⁶ ℃⁻¹ (the original source-text extraction is "(11[unreadable sign]1)×10"℃～", requires confirmation against the source standard (source-text extraction))) | not provided in the available source |
| Coating | Use suitable corrosion-resistant material, but the tape shall not be made an electrical insulator | not provided in the available source |
| Hook | Permanently fixed (e.g. riveted) to the front end of the tape, shall have a device to prevent accidental detachment | not provided in the available source |
| Width | 13 mm±0.5 mm | not provided in the available source |
| Thickness (before etching or electroplating) | 0.25 mm±0.05 mm | not provided in the available source |
| Recommended lengths | 5 m, 10 m, 15 m, 20 m, 25 m, 30 m, 40 m, 50 m | not provided in the available source |
| Graduated face | Graduation is required on only one face of the tape | not provided in the available source |
| Graduation units | Graduated in metres, centimetres and millimetres | not provided in the available source |
| Maximum width of graduation marks | Not more than 0.5 mm | not provided in the available source |
| Zero reference | After the tape and the gauging bob are combined, the zero reference is located at the lowest bottom face of the gauging bob | not provided in the available source |
| Accuracy (newly manufactured, 0～30 m) | Maximum permissible error not more than ±1.5 mm | see 5.9 |
| Accuracy (in service, 0～30 m) | Maximum permissible error not more than ±2.0 mm | see 5.9 |
| Accuracy (30.001～60.000 m, new) | ±2.25 mm | see 5.9 |
| Accuracy (30.001～60.000 m, in service) | ±3.0 mm | see 5.9 |
| Accuracy (60.001～90.000 m, new) | ±3.0 mm | see 5.9 |
| Accuracy (60.001～90.000 m, in service) | ±4.0 mm | see 5.9 |
| Standard tension (recommended) | 10 N or 15 N | see 5.9 |
| Marking | a) standard number GB/T 13236; b) manufacturer name or trademark; c) serial number; d) calibration standard conditions (temperature usually 20℃; tension usually 10 N or 15 N); e) other necessary legal marks | see 5.10 |
3.2 Tape reel frame (Chapter 6)
| Item | Indicator | Test method standard number |
|---|---|---|
| Capacity | Sufficient to wind a sufficient length of tape without squeezing the tape or the tape reel frame | not provided in the available source |
| Material | Non-sparking material (e.g. copper) | not provided in the available source |
| Tape length marking | Shall be clearly marked on the specially designed tape reel frame | not provided in the available source |
| Tape drum diameter | Not less than 28 mm (the original source-text extraction is "28 122122", requires confirmation against the source standard (source-text extraction)) | not provided in the available source |
| Handle | Equipped with a freely rotating spherical knob | not provided in the available source |
| Pin | The tape drum is equipped with a suitable pin to secure the end of the tape | not provided in the available source |
| Earthing | The tape and tape reel frame shall have earthing measures during use | not provided in the available source |
3.3 Gauging bob (Chapter 7)
| Item | Indicator | Test method standard number |
|---|---|---|
| Material | Non-sparking material of suitable density (e.g. copper) | not provided in the available source |
| Structure | Lower part is a conical cylinder, bottom is a plane perpendicular to the main axis | not provided in the available source |
| Plane width | A plane of not less than 10 mm width is provided on the outer face for engraving graduations | not provided in the available source |
| Mass | At least 0.6 kg; a heavier one may be used when measuring sediment (e.g. 1.5 kg) | not provided in the available source |
| Accuracy | From the zero reference to any point on the graduated scale, the maximum permissible error is not more than ±0.5 mm | see 7.5 |
| Zero mark | The bottom face of the bob serves as the zero reference of the combined tape and gauging bob | see 7.6 |
| Width of graduation marks | Not more than 0.50 mm | see 7.7.1 |
| Marking | a) standard number GB/T 13236; b) serial number (consistent with the tape); c) other necessary legal marks | see 7.8 |
3.4 Ullage gauge (Chapter 8)
| Item | Indicator | Test method standard number |
|---|---|---|
| Material | Non-sparking material (e.g. copper) | not provided in the available source |
| Structure | Bar-shaped plate, graduations engraved on the flat face, edges cut into right angles with smooth transitions | not provided in the available source |
| Mass | At least 0.6 kg | not provided in the available source |
| Accuracy | From the zero reference to any point on the graduated scale, the maximum permissible error is not more than ±0.5 mm | see 8.5 |
| Zero mark | The zero reference after the tape and ullage gauge are combined is the zero mark engraved on the ullage gauge | see 8.6 |
| Width of graduation marks | Not more than 0.50 mm | see 8.7.2 |
| Marking | a) standard number GB/T 13236; b) serial number (consistent with the tape); c) necessary legal marks | see 8.9 |
3.5 Water-finding gauge (Chapter 9)
| Item | Indicator | Test method standard number |
|---|---|---|
| Material | Outer frame and conductive isolating parts made of non-sparking material (e.g. copper); non-conductive isolating parts made of transparent plastic | not provided in the available source |
| Surface area of non-conductive plastic isolating part | Less than 2.8×10⁻³ m² (the original source-text extraction is "2.8×10_3 ra2", requires confirmation against the source standard (source-text extraction)) | see 9.3.1 |
| Mass | At least 0.6 kg | not provided in the available source |
| Accuracy | The entire working length (usually 350 mm) is graduated in centimetres and millimetres; from the zero reference to any point the maximum permissible error is not more than ±0.5 mm | see 9.5 |
| Width of graduation marks | Not more than 0.5 mm | see 9.6.2 |
| Marking | a) standard number GB/T 13236; b) necessary legal marks | see 9.7 |
3.6 Interface-indicating paste (Chapter 10)
| Item | Indicator | Test method standard number |
|---|---|---|
| Oil-indicating paste | Indicates the liquid level through a clear colour change; shall not cause the indicated liquid level to have an upward creeping tendency | not provided in the available source |
| Water-indicating paste | Indicates the liquid level through a clear colour change; shall not indicate a liquid level with an upward creeping tendency | not provided in the available source |
3.7 Portable electronic metering device PEGDs (Chapter 11)
| Item | Indicator | Test method standard number |
|---|---|---|
| Safety requirements | The electronic system uses low-voltage dry batteries; the entire device is intrinsically safe; complies with the requirements of GB 3836.4 | GB 3836.4 |
| Measuring tape | Complies with the provisions for the tape blade in 5.2, 5.3, 5.6; graduations comply with 5.7; standard tension equals the tensile force generated by the mass of the sensing probe of PEGD when the tape blade is suspended vertically (±10%) | not provided in the available source |
| Measuring probe | Made of non-sparking material, with a mass that keeps the tape blade plumb | not provided in the available source |
| Zero reference | In ullage mode, it is the response point where the sensor detects the oil surface; usually not on the bottom surface of the probe, but located at a fixed distance from the bottom surface (specified by the manufacturer) | See 11.5 |
| Accuracy | Does not exceed the maximum permissible error of the conventional gauging tape in 5.9, and an additional error of ±0.5 mm is allowed | See 11.6 |
| Reading pointer width | Does not exceed 0.5 mm | See 11.7 |
| Maximum permissible error of reading pointer deviation distance | ±0.2 mm | See 11.7 |
| Conductive continuity | A conductive path shall be provided between the measuring probe and the reel frame, and a grounding point or grounding conductor shall be provided on the reel frame | See 11.8 |
| Marking | Tape reel frame: a) standard number GB/T 13236; b) unique serial number. Graduated tape: a) standard calibration conditions (temperature, tension); b) other necessary legal markings | See 11.9 |
3.8 Vapor lock valve (Chapter 12)
| Item | Index | Test method standard number |
|---|---|---|
| Design structure | Enables metering or sampling of vapor-tight tanks under pressure and with minimal vapor loss; suitable for the working pressure of the oil tank (with an appropriate safety margin) | not provided in the available source |
| Ball valve diameter | Large enough to allow the metering device to pass through smoothly | not provided in the available source |
| Sealing materials and gaskets | Can sufficiently prevent corrosion by liquid-phase and gas-phase petroleum products | not provided in the available source |
| Grounding continuity | The connection between the tank shell and the gauging tape shall maintain grounding continuity | not provided in the available source |
3.9 Dip rods and ullage rods (Chapter 13)
| Item | Index | Test method standard number |
|---|---|---|
| Material | Copper, wood, carbon-impregnated reinforced glass plastic (GRP) or other safe and effective materials are recommended; magnesium or aluminum alloys shall not be used | not provided in the available source |
| Surface resistance of plastic material | Under relative humidity of 25℃ and 50%, surface resistance is less than 10⁹ Ω, and leakage resistance is less than 10¹¹ Ω (the source text source-text extraction is “109 0” “10” 0”, requires confirmation against the source standard (source-text extraction)) | See 13.2 |
| Profile cross-section | Face width is approximately 20 mm, thickness is not less than 3 mm; for other cross-sections, the width of one flat surface is not less than 16 mm | See 13.3.1 |
| Dip rod length | After being inserted to the bottom gauging point, the length exposed above the gauging hatch is not less than 150 mm | See 13.3.2 |
| Graduation units | Length units: meter, centimeter, millimeter; volume units: multiples of 1 L | See 13.4.1 |
| Graduation mark width | Does not exceed 0.5 mm | See 13.4.3 |
| Distance between center lines of adjacent marks (volume graduations) | Not less than 5 mm | See 13.4.3.2 |
| Numeral height | At least 2 mm | See 13.4.4 |
| Accuracy (length graduations) | Calibrated without constraint by 20℃, total length error does not exceed ±1 mm; error at all graduation positions does not exceed ±1 mm | See 13.6.1 |
| Accuracy (volume graduations) | Position error of graduation marks relative to the calibration reference does not exceed 1 mm | See 13.6.2 |
| Marking (length graduations) | a) standard number GB/T 13236; b) manufacturer name or trademark; c) dip rods are marked “innage” or “DIP”, ullage rods are marked “ullage” or “ULLAGE” | See 13.7.1 |
| Marking (volume graduations) | a) standard number GB/T 13236; b) tank identification code or number (including compartment number for multi-compartment tanks); c) name of the calibration organization | See 13.7.2 |
4. List of referenced test methods
- GB 3836.4 Electrical apparatus for explosive gas atmospheres—Part 4: Intrinsic safety “i” (GB 3836.4—2000, eqv IEC 60079-11: 1999)
- GB/T 8927 Petroleum and liquid petroleum products—Temperature measurement—Manual method (GB/T 8927—2008, ISO 4268: 2000, MOD)
- GB/T 13894 Petroleum and liquid petroleum products—Level measurement method (manual method)
- ISO 1998 (all parts) Petroleum industry terminology
- ISO 4269 Petroleum and liquid petroleum products—Tank liquid calibration method—Volumetric flow meter increment method
5. Inspection rules, sampling
- Calibration/verification certificate: For any part of the measuring equipment (such as the tape blade, dip weight, or ullage weight), if a calibration (or verification) certificate is required, it shall be obtained from a qualified authoritative organization and traceable to the corresponding national standard; within the confidence range of 95%, the maximum uncertainty of the reference standard shall not exceed the maximum permissible error value specified in this standard (5.9). (4.1)
- Equipment after repair: Equipment that has been repaired shall no longer be used for reference purposes; however, if it has been inspected by a qualified authoritative organization and confirmed to comply with the provisions of this standard, it may be used for other purposes. (4.2)
- Inspection before first use: The accuracy of the gauging tape shall be inspected, and thereafter periodic inspections shall be carried out (for example, every 6 months). (5.9)
- Inspection content (5.9):
- a) With the gauging tape suspended vertically in air, use a movable vernier microscope or similar device (within the confidence range of 95%, the maximum uncertainty at any point within 500 mm does not exceed 0.2 mm) to inspect the distance from the zero reference of the dip weight to a convenient graduation on the dip tape (such as the 300 mm graduation);
- b) With the tape blade suspended vertically by the tension of the weight, or placed horizontally under standard tension and temperature, at intervals of approximately 5 m, directly compare with a standard gauging tape or other standard device (within the confidence range of 95%, the maximum measurement uncertainty at any point within 30 m does not exceed 0.25 mm) to inspect the distance from a certain graduation mark on the tape blade to a series of other graduations.
- Uncertainty of standard measuring equipment: For standard measuring equipment used to inspect the combination of the tape blade and dip weight, within the confidence range of 95%, for any distance between 0 m and 30 m, the uncertainty of calibration traceability does not exceed 0.5 mm. (5.9)
- PEGD Inspection: Inspect the accuracy of each PEGD before first use, and thereafter periodically (for example, every 6 months). (11.6)
- Sampling: not provided in the available source.
6. Marking, packaging, transportation, storage
- Tape blade marking (5.10): a) standard number GB/T 13236; b) manufacturer name or trademark; c) serial number; d) standard calibration conditions (temperature usually 20℃; tension usually 10 N or 15 N); e) other necessary legal markings.
- Dip weight marking (7.8): a) standard number GB/T 13236; b) serial number (consistent with the tape blade); c) other necessary legal markings.
- Ullage weight marking (8.9): a) standard number GB/T 13236; b) serial number (consistent with the tape blade); c) necessary legal markings.
- Water-finding tape marking (9.7): a) standard number GB/T 13236; b) necessary legal markings.
- PEGD marking (11.9): Tape reel frame: a) standard number GB/T 13236; b) unique serial number. Graduated tape: a) standard calibration conditions (temperature, tension); b) other necessary legal markings.
- Dip rod/ullage rod marking (13.7): Length graduations: a) standard number GB/T 13236; b) manufacturer name or trademark; c) dip rods are marked “innage” or “DIP”, ullage rods are marked “ullage” or “ULLAGE”. Volume graduations: a) standard number GB/T 13236; b) tank identification code or number (including compartment number for multi-compartment tanks); c) name of the calibration organization.
- Transportation/storage recommendation: During transportation or storage, it is recommended to remove the dip weight, ullage weight, and water-finding tape from the tape blade to avoid frequent bending of the tape blade at the connection point and the resulting tape breakage. (5.1.1)
- Packaging: not provided in the available source.
- Storage: not provided in the available source.
7. Quick reference Q&A
| Question | Key answer points |
|---|---|
| Which old standard does this standard replace? | Replaces GB 13236—1991 “Technical conditions for petroleum gauging tapes and steel girth tapes”. |
| What international standard does this standard adopt? | Modified adoption of ISO 4512: 2000 (MOD). |
| Requirements for tape blade width and thickness? | Width 13 mm±0.5 mm; thickness (before etching or electroplating) 0.25 mm±0.05 mm. |
| Range of tape blade tensile strength? | 1 600 N/mm²～1 850 N/mm². |
| Maximum permissible error of a new gauging tape at 0～30 m? | ±1.5 mm. |
| Maximum permissible error of a gauging tape in use at 0～30 m? | ±2.0 mm. |
| Recommended standard tension for gauging tapes? | 10 N or 15 N. |
| Minimum mass of the dip weight? | At least 0.6 kg. |
| Accuracy requirement for the sounding bob? | From the zero reference point to any point on the graduated scale, the maximum permissible error shall not exceed ±0.5 mm. |
| Can the ullage tape and the water-finding tape be interchanged? | Not allowed; the two have different zero reference points. |
| Maximum permissible error of PEGD liquid level measurement? | Shall not exceed the maximum permissible error of a conventional gauging tape in 5.9; an additional error of ±0.5 mm is allowed. |
| Maximum permissible error of the PEGD reading pointer deviation distance? | ±0.2 mm. |
| Recommended length of the sounding rod/ullage rod? | Preferably not exceeding 5 m. |
| Can magnesium or aluminum alloy be used for the sounding rod/ullage rod? | Magnesium or aluminum alloys shall not be used. |
| Length scale accuracy of the sounding rod/ullage rod? | 20℃ non-binding calibration; the total length error shall not exceed ±1 mm; the error at all scale positions shall not exceed ±1 mm. |
| Recommended inspection interval for the gauging tape? | For example, every 6 months. |
| Can grease or chalk be used instead of oil-finding paste/water-finding paste? | Not allowed for high-accuracy measurement; grease or chalk may make the indicated liquid level several millimeters higher than the true liquid level. |
| Grounding requirement for the vapor lock valve? | The connection between the tank shell and the gauging tape shall maintain grounding continuity. |
| What is the usual working length of the water-finding tape? | Usually 350 mm. |
| Surface area limit of the non-conductive plastic isolator of the water-finding tape? | Less than 2.8×10⁻³ m². |
| Surface resistance requirement for plastic material of the sounding rod/ullage rod? | Under relative humidity of 25℃ and 50%, the surface resistance shall be less than 10⁹ Ω, and the leakage resistance shall be less than 10¹¹ Ω. |
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