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JJG 266-2018 English PDF

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JJG 266-2018: Horizontal Metal Tank Capacity
Status: Valid

JJG 266: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
JJG 266-2018English1149 Add to Cart 7 days [Need to translate] Horizontal Metal Tank Capacity Valid JJG 266-2018
JJG 266-1996English599 Add to Cart 4 days [Need to translate] Verification Regulation of the Volume of Horizontal Metallic Tank Obsolete JJG 266-1996
JJG 266-1981EnglishRFQ ASK 3 days [Need to translate] Verification Regulation of Metallic Horizontal Tank Obsolete JJG 266-1981

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Basic data

Standard ID JJG 266-2018 (JJG266-2018)
Description (Translated English) Horizontal Metal Tank Capacity
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A52
Word Count Estimation 50,587
Date of Issue 2018-12-25
Date of Implementation 2019-06-25
Older Standard (superseded by this standard) JJG 266-1996
Regulation (derived from) State Administration of Markets, Announcement No.34 of 2018
Issuing agency(ies) State Administration for Market Regulation

JJG 266-2018: Horizontal Metal Tank Capacity

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Horizontal Metal Tank Capacity National Metrology Verification Regulations of the People's Republic Horizontal metal tank capacity Published on.2018-12-25 2019-06-25 implementation State Market Supervisory Administration released Horizontal metal tank capacity verification procedures Focal Point. National Capacity Measurement Technical Committee Main drafting unit. China Institute of Metrology Participated in the drafting unit. National Large Capacity Second Metering Station Henan Institute of Metrology Xinjiang Uygur Autonomous Region Metrology and Testing Institute Anhui Institute of Metrology Beijing Institute of Optoelectronic Technology This regulation entrusts the National Capacity Measurement Technical Committee to explain The main drafters of this procedure. Liu Ziyong (China Institute of Metrology) Wang Jintao (China Institute of Metrology) Participate in the drafters. Jie Junxiang (National Large Capacity Second Metering Station) Cui Yaohua (Henan Institute of Metrology) Li Xiaoyu (Xinjiang Uygur Autonomous Region Metrology and Testing Institute) Sun Xiuliang (Anhui Institute of Metrology) Zhao Yan (Beijing Institute of Optoelectronic Technology)

table of Contents

Introduction (II) 1 Scope (1) 2 References (1) 3 Terms and units of measurement (1) 3.1 Terminology (1) 3.2 Unit of measurement (2) 4 Overview (2) 4.1 Structure of horizontal tank (2) 4.2 Use of horizontal tanks (4) 4.3 Horizontal tank capacity measurement principle (4) 5 Metrological performance requirements (4) 6 General technical requirements (4) 6.1 Construction requirements (4) 6.2 Appearance requirements (5) 6.3 Installation Requirements (5) 6.4 Sealing requirements (5) 7 measuring instrument control (5) 7.1 Verification conditions (5) 7.2 Verification project (7) 7.3 Verification method (7) 7.4 Data Processing (8) 7.5 Preparation of the capacity table (9) 7.6 Verification result processing (9) 7.7 verification period (9) Appendix A Manual Geometry (10) Appendix B Photoelectric Geometry (32) Appendix C Three-time uniform B-spline interpolation algorithm (35) Appendix D Horizontal Metal Tank Verification Record (Capacity Comparison Method Reference Format) (37) Appendix E Horizontal Metal Tank Verification Record (Photoelectric Geometry Reference Format) (38) Appendix F Horizontal Metal Can Calibration Record (Manual Measurement Reference Format for Manual Geometry) (39) Appendix G Horizontal Metal Tank Verification Record (Manual Measurement Reference Format for Manual Geometry) (41) Appendix H Certification Certificate Inner Page Reference Format (43) Appendix I Horizontal Metal Tank Capacity Table Reference Format (44)

Introduction

This regulation is based on JJF1002-2010 "National Metrology Verification Procedures Writing Rules" as the basic norms. This procedure is based on the international recommendations of the international legal system. OIMLR71.2008 "General requirements for fixed storage tanks (Fixedstoragetanks-Generalrequirements), International Standard ISO 12917-1.2002 "Petroleum And calibration of horizontal cylindrical tanks for liquid petroleum products - Part 1. Manual method Petroleum products-Calibration of horizontalcylindricaltanks-Part 1. Manual Method) and ISO 12917-2.2002 "Calibration of Horizontal Cylindrical Tanks for Petroleum and Liquid Petroleum Products" Part. Photoelectric Distance Measurement Method (Petroleumandliquidpetroleumproducts-Calibrationofhori- zontalcylindricaltanks-Part 2. Internalelectro-opticaldistance-rangingMethod) Foundation, combined with the industry situation and actual demand of China's horizontal metal can capacity measurement, on JJG 266-1996 "Horizontal Gold The canister volume was revised. Compared with JJG 266-1996, in addition to editorial changes, the main technical changes in this procedure are as follows. --- Added introduction; --- Added reference files; --- Added terms and units of measure; --- Added general technical requirements; --- Refined metrological performance requirements; ---Modified and improved the verification method; ---Modified and perfected the calculation method of the capacity table, the "capacity comparison method" uses the cubic uniform B-spline interpolation algorithm; --- Modified the verification record format; --- Modified the textual expression of the verification cycle. The previous versions of this procedure are released as follows. ---JJG 266-1996. Horizontal metal tank capacity verification procedures

1 Scope

This procedure is applicable to the first verification, subsequent verification and use of the capacity of horizontal metal cans (hereinafter referred to as horizontal tanks). an examination.

2 reference files

This procedure refers to the following documents. JJF1009-2006 Capacity measurement terminology and definition OIMLR71.2008 Fixed storage tanks-General requirements ISO 12917-1.2002 Calibration of horizontal cylindrical tanks for petroleum and liquid petroleum products - Part 1. Manual method (Petroleumandliquidpetroleumproducts-Calibrationofhorizontalcylindrical tanks-Part 1.Manualmethod) ISO 12917-2.2002 Calibration of horizontal cylindrical tanks for petroleum and liquid petroleum products - Part 2. Intraphotoelectric ranging method (Petroleum and liquid petroleum products-Calibration of horizontalcy- lindricaltanks-Part 2.Internalelectro-opticaldistance-rangingmethod) For dated references, only dated versions apply to this Code; any undated quotation The latest version (including all amendments) applies to this procedure.

3 terms and units of measure

3.1 Terms The following terms and definitions apply to this procedure. 3.1.1 Straight cylindrical part (cylinder) horizontalcylinder A horizontal tank portion that is round or elliptical in cross section welded with steel plates in a butt joint, lap or spiral. 3.1.2 docking horizontal tank butt-weldedhorizontaltank A horizontal can that is welded in a butt joint between straight cylindrical plates. 3.1.3 lapped (interactive) horizontal tank lap-weldedhorizontaltank A horizontal can that is welded in a lap joint between straight cylindrical plates. 3.1.4 spiral horizontal tank spiral-weldedhorizontaltank A horizontal tank welded in a spiral form between straight cylinder plates. 3.1.5 The vertical diameter inside the gauge point is insideverticaldiameteratdip-hatch The vertical inner diameter of the straight cylinder measured from the oil hole. 3.1.6 casing ruler casingcouplingmeter An extensible tubular measuring device for measuring the length between two points. 3.1.7 Automatic level gauge automaticlevelgauge Apparatus for automatically measuring and displaying the level of liquid stored in a horizontal tank relative to a fixed reference (dot) level Device. The automatic level gauge should include at least. a liquid level sensor, a transmitter and a pointing device. 3.1.8 horizontal cross-sectional area in the tank internalcross-sectionalareaofthetank The area of the cross section obtained from the internal contour of the horizontal tank. 3.1.9 Standard metal gauge standardmetaltank Made of metal (stainless steel, carbon steel, etc.) according to the specified structure, with a defined volume, which can be used as capacity A measuring instrument for the transfer of values. 3.1.10 reference height referenceheight The vertical distance between the upper and lower measurement reference points is also called the height of the gauge point. 3.2 Unit of measurement Volume unit. liter, symbol L; cubic meter, symbol m3. Length unit. mm, symbol mm; centimeter, symbol cm; decimeter, symbol dm; meter, symbol m. Temperature unit. Celsius, symbol °C. Time unit. second, symbol s.

4 Overview

4.1 Structure of horizontal tank The horizontal tank is a horizontally mounted cylindrical metal tank, which is composed of a cylinder and a head (top plate), a metering port, a measuring tube, a manhole, Incoming and outgoing pipelines and other accessories. According to the welding form of the cylinder, it is generally divided into docking tank (see Figure 1), lap tank (see Figure 2) or screw Rotary cans (see Figure 3); according to the type of head, there are generally curved tops, semi-ellipsoid tops, spherical tops, flat tops, round tops and conical tops (see Figure 4). Figure 1 Schematic diagram of docking horizontal tank structure Figure 2 Schematic diagram of the lapped horizontal tank structure Figure 3 Schematic diagram of the spiral horizontal tank structure Figure 4 Schematic diagram of horizontal metal can sealing head 4.2 Use of horizontal tanks Horizontal tanks are widely used in the petrochemical industry as a measuring instrument for the measurement and storage of liquids. 4.3 Horizontal tank capacity measurement principle Horizontal tank capacity measurement is divided into capacity comparison method and geometric measurement method. The volume comparison method is to inject a certain volume into a horizontal tank by using an automatic or manual standard metal gauge device. Calibrate the medium and measure the temperature of the medium before and after injection into the horizontal tank, and the liquid in the tank after injecting the horizontal tank The height of the bit (empty height or solid height) is calculated by calculating the capacity table of the horizontal tank. Geometry is measured by using the photoelectric internal distance measurement method or manual method to measure the geometry of the horizontal tank. Calculate the capacity meter of the horizontal tank. Measurement of water in each specified height by photoelectric intra-range distance measurement and automatic horizontal cross-section scanning The method of flat cross-sectional area is called photoelectric geometric measurement method; the diameter of the ring plate of the horizontal tank is measured by manual method, and the ring plate is used. Length, total length of the can, thickness of the ring, height of the head, radius of the transition curve, vertical diameter of the ruler point, inclination angle, etc. Data, called manual geometry measurement.

5 Metrological performance requirements

Relative expansion uncertainty of horizontal tank capacity measurement results (more than 75% of total volume). Capacity comparison method. no more than 0.25% (k=2); Geometric measurement. no more than 0.40% (k = 2).

6 General technical requirements

6.1 Construction requirements Horizontal tanks must be manufactured in accordance with relevant regulations, and their structure, shape, material strength, etc. should meet the specified requirements. There should be a permanent nameplate on the obvious position of the tank, including. specification model, equipment number, manufacturing Factory, construction date, etc. The horizontal tank metering port should be installed vertically on the top of the tank. There should be a measuring tube inside, which is generally used in diameter (50~ 100) mm steel pipe, the pipe wall should have intersecting holes or strip holes, the hole diameter should be greater than 10mm, any two holes The pitch is not more than 100mm, and the strip hole width is (8~10) mm. 6.2 Appearance requirements The head and straight cylinder of the horizontal tank shall have no obvious unevenness and permanent deformation affecting the capacity. 6.3 Installation requirements Horizontal tanks should be installed on a solid foundation so that the base of the tank does not deform much over time; the tank should be installed Leveled state. Specially required cans can be installed as designed. 6.4 Sealing requirements The horizontal tank outlet should be well sealed, and the valves and connections should be flexible and reliable without leakage.

7 measuring instrument control

Measurement appliance control includes. first verification, subsequent verification, and in-use inspection. 7.1 Verification conditions 7.1.1 Technical requirements 7.1.1.1 Newly built, overhauled and reinstalled horizontal tanks are required to hold more than 80% of the total tank volume. 72h, and after the test pressure is confirmed, the test can be carried out. 7.1.1.2 Verification of horizontal tanks in use shall be carried out without or without transmission or normal inspection. 7.1.2 Security requirements 7.1.2.1 The relevant safety and operating practices must be observed throughout the verification process. 7.1.2.2 The electrical equipment used in the verification shall comply with the explosion protection requirements of the corresponding grade. 7.1.2.3 In the case of on-site measurements, the clothing, shoes, caps and various measuring equipment of the certified personnel must comply with the relevant safety. Requires to avoid the generation of static electricity and sparks. When entering the tank, the ladder must be secure. 7.1.2.4 It is required to clean the tank during the measurement of the tank, and there should be no residual liquid or sediment in the tank, making it toxic and easy. The concentration of the gas is in compliance with the requirements of the safety regulations and should be approved by the relevant department. 7.1.3 Environmental requirements 7.1.3.1 The capacity comparison method shall be carried out indoors or in the awning. The temperature in the room or awning shall be within the range of (5~40) °C. 7.1.3.2 The test medium shall be treated with circulating water or in use. The temperature of the liquid shall not exceed 5 °C during one measurement. 7.1.3.3 The standard metal measuring device is placed on the workbench, and its liquid discharge port should be higher than the horizontal tank inlet, and should not be drained. There is liquid spilling out of the horizontal tank, and the connecting piping should be free of leakage. 7.1.3.4 The verification site should be solid and flat. 7.1.4 Verification equipment The main verification equipment and parameters are shown in Table 1, and the supporting equipment is shown in Table 2. The equipment in Table 1 must be verified or calibrated, and It can be confirmed by verification or calibration results and can be used during the traceback period. Table 1 Main verification equipment and parameters 7.2 Verification project The verification items are shown in Table 3. Table 3 List of verification items 7.3 Verification method 7.3.1 Visual inspection 7.3.1.1 The inspection of the construction of the tank shall comply with the requirements of 6.1. 7.3.1.2 Check the appearance of the tank and comply with the requirements of 6.2. 7.3.1.3 The installation of the tank shall be in accordance with the requirements of 6.3. 7.3.2 Sealing inspection During the verification process, observe whether the seals such as the oil outlet of the tank are good, and whether the tank valve and the connecting parts have leakage, it should meet the requirements of 6.4. 7.3.3 Capacity measurement The horizontal tank capacity measurement method is divided into a capacity comparison method and a geometric measurement method. The capacity comparison method is used in the body of the procedure. See Appendix A (Manual Geometry) and Appendix B (Photoelectric Geometry) for geometry measurements. 7.3.3.1 Preparation before measurement a) Determine the basic information of the horizontal tank to be inspected. tank number, nominal volume, safety level of liquid injection, type of oil in horizontal tank, and record; b) measuring the reference height with the sounding steel tape measure, the vertical diameter within the gauge point, the height of the residual liquid in the horizontal tank, and recording; c) Verification according to the nominal volume, the safe height of the injection, the vertical diameter within the gauge point and the liquid level in the horizontal tank Point and liquid level height interval. the number of verification points shall not be less than 10; The liquid level height interval shall be such that the liquid level rise height between each point is as uniform as possible, and is not more than 250 mm, not less than 150 mm; d) Calculate and generate a sequence of verification operations. 7.3.3.2 Measurement procedure a) Place the standard metal gauge verification device in the vicinity of the horizontal tank to be inspected, level and reliably ground; b) connect the liquid source outlet of the verification medium to the liquid inlet of the standard metal measuring device, and the liquid discharge port of the standard metal measuring device Horizontal tank connection to be inspected; c) opening the infusion pump to fill the piping system with the verification medium; d) in accordance with the requirements of the standard metal measuring device, complete the operations of liquid injection and drainage, drip waiting; e) measuring and recording the corresponding standard metal gauge volume VBi, liquid temperature t1i; f) measuring the liquid temperature t2i and the liquid level height hi in the horizontal tank, the liquid level height should not be less than 2 times each time, The difference shall not exceed 1mm, take the average value, and correct it according to the calibration or calibration certificate correction value; g) Repeat d), e) and f) according to the sequence of verification operations until the horizontal tank is filled to a safe height; h) For newly manufactured and repaired horizontal tanks, the capacity value measurement shall be carried out not less than two times, and the average value shall be taken; The second pass measurement method is the same as the first pass, and the difference between the measurement results must not be greater than half of the specified extended uncertainty. Otherwise retest. Subsequent verifications can be performed once. 7.4 Data Processing 7.4.1 Capacity comparison method calculation 7.4.1.1 Single injection liquid volume conversion

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