GB/T 12242-2021 English PDFUS$1229.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 12242-2021: Pressure relief devices - Performance test code Status: Valid GB/T 12242: Historical versions
Basic dataStandard ID: GB/T 12242-2021 (GB/T12242-2021)Description (Translated English): Pressure relief devices - Performance test code Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J16 Word Count Estimation: 66,660 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 12242-2021: Pressure relief devices - Performance test code---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.Pressure relief devices - Performance test code ICS 13.240 CCSJ16 National Standards of People's Republic of China Replace GB/T 12242-2005 Pressure relief device performance test method Released on 2021-03-09 2021-10-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee Table of contentsForeword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 General 6 5 Pressure release device action performance and displacement test 6 5.1 Test equipment and instruments 6 5.2 Measurement method 11 5.3 Test installation requirements 13 5.4 Test procedure 14 5.5 Calculation of results 28 5.6 Test summary report 29 6 In-use test and constant pressure test on workbench 31 6.1 Measuring instruments and measuring methods 31 6.2 Test procedures in use 32 6.3 Constant pressure test procedure on the workbench 33 6.4 Seal test 34 6.5 Calculation of results 34 6.6 Test summary report 35 Appendix A (Informative) Test Report Form 37 Appendix B (Informative) Test Summary Report Form 54 Appendix C (informative) Example of determining flow error 58 Pressure relief device performance test method1 ScopeThis document specifies the test methods for the operating performance test (including mechanical characteristics), displacement and resistance coefficient of the pressure release device. This document is applicable to test procedures with various import and export conditions, and the test medium is steam and gas whose physical properties are known. (Air) or liquid (water); including reclosing and non reclosing pressure relief devices, as follows. a) safety valve, b) Bursting disc device, c) Break/shear pin device, d) Fusible plug device. When the parties involved in the test agree to accept the terms of this document, this document can also be applied to other pressure relief devices.2 Normative referencesThe contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 2624.1 Use a differential pressure device installed in a circular cross-section pipe to measure the flow of fluid in a full pipe. Part 1.General principles and Claim GB/T 2624.2 Use a differential pressure device installed in a circular cross-section pipe to measure the flow of fluid in a full pipe. Part 2.Orifice plate GB/T 12241 General requirements for safety valves GB/T 12243 spring direct load safety valve3 Terms and definitionsThe following terms and definitions defined in GB/T 12241 apply to this document. 3.1 General terms 3.1.1 Pressure relief device A device used to prevent the pressure of the internal medium from rising to exceed the predetermined maximum pressure when the pressure vessel is in an emergency or abnormal situation. 3.1.2 Pressure relief valve pressure relief valve; PRV A valve used to prevent the pressure of the internal medium from rising to exceed the predetermined maximum pressure when the pressure vessel is in an emergency or abnormal situation. 3.1.3 Field test fleldtesting In order to determine some or all of the working characteristics of the pressure relief device, the test of the pressure relief device installed on the system. 3.1.4 In-service testing In order to determine some or all of the working characteristics of the pressure relief device, use system pressure or use an external pressure source (with or without auxiliary Lifting device) A test of a pressure relief device installed on the system that is protecting the system. 3.1.5 Displacement test flowcapacitytesting Determining the operating characteristics of the pressure relief device includes a test to measure the displacement. 3.1.6 Benchtesting A test on a pressurized system to determine the set pressure of the pressure relief device and the tightness of the closure. 3.2 Types of pressure relief devices 3.2.1 Reclosing pressure-Relieving devices Designed as a pressure release device that is driven by the inlet static pressure and re-closes after returning to normal working conditions. Note. The structure types are spring direct load type, pilot type, power operation type. 3.2.2 Non-reclosing pressure relief device A pressure release device that remains open after an action can provide a means of manual reset. Note. Non-reclosing pressure release devices include rupture discs, breaking pins, bending pins, shear pins, and fusible plugs. 3.2.2.1 Rupture disk device The function of a non-reclosing pressure release device driven by the static pressure difference between the inlet and outlet of the device is realized by the blasting of the pressure-bearing piece. 3.3 Characteristic dimensions of pressure relief device 3.3.1 Dischargearea The minimum cross-sectional area of the fluid passage when the valve is discharged. 3.3.2 Nozzlearea The minimum cross-sectional area of the flow path from the inlet end of the valve to the sealing surface of the closing member. 3.3.3 Nozzlediameter Corresponds to the diameter of the flow channel area. 3.3.4 Curtainarea When the valve flap rises above the valve seat, the cylindrical or conical discharge channel area is formed between the sealing surfaces. Note. The area of the curtain is shown in Figure 1. 3.3.7 Seatangle The angle between the valve axis and the sealing surface. Note. The bevel angle of the sealing surface of the flat sealing valve is 90°. 3.4 Characteristic dimensions of non-reclosing pressure relief devices 3.4.1 Net flow area netflowarea The area of the flow rate is determined after the non-reclosing pressure release device operates. Note. The (minimum) net flow area of a rupture disc is the calculated net area after it is completely ruptured, and it has an appropriate tolerance, because some structural parts of the rupture disc May reduce its net circulation area. 3.5 Action and displacement characteristics of the pressure release device 3.5.1 Set pressure The inlet static pressure raised by the pressure release device, under which the device exhibits the definition of opening pressure, sudden jump pressure, and starting leakage pressure One of the action characteristics of force, burst pressure, and breaking pressure (for a specific device design, the applicable action characteristics are determined by the device manufacturer. set). 3.5.2 Overpressure The pressure increase exceeding the set pressure of the pressure release valve, at which the safety valve reaches the opening height specified by the manufacturer. Note. The excess pressure is usually expressed as a percentage of the set pressure. 3.5.3 Re-seating pressure After the pressure release valve is discharged, the disc contacts the valve seat again, that is, the pressure when the opening height becomes zero. 3.5.4 Blowdown The difference between the set pressure and the return pressure. Note. The opening and closing pressure difference is expressed as a percentage of the set pressure or in pressure units. 3.5.5 Discharge pressure Set pressure plus over pressure. 3.5.6 Rated discharge pressure flow-ratingpressure The inlet static pressure when measuring the displacement of the pressure release device. 3.5.7 Backpressure The static pressure generated at the outlet of the pressure relief device due to the presence of pressure in the exhaust system. 3.5.8 Built-upbackpressure The pressure generated at the outlet of the device as the medium flows through the pressure relief device into the discharge system. 3.5.9 Superimposedbackpressure The pressure that exists at the outlet of the pressure relief device immediately before it operates. Note. The additional back pressure is caused by other pressure sources in the exhaust system. 3.5.10 Burst pressure When the bursting disc device operates, its inlet static pressure. 3.5.11 Specified burst pressure of bursting disc device specified burst pressure of a rupture disk device The inlet static pressure of the bursting disc device is increased, and the bursting disc is designed to burst at this pressure at a specified temperature. 3.5.12 Breaking pressure When the broken pin device, bend pin device or shear pin device operates, its inlet static pressure. 3.5.13 Secondary pressure The pressure existing in the passage between the actual discharge section of the pressure relief valve and the outlet. 3.5.14 Simmerpressure An inlet static pressure lower than the set pressure of the pressure release valve. Under this pressure, the sealing surface of the safety valve closing part can be audible or The visually perceived medium is leaking, but there is no measurable displacement. Note. The front discharge pressure is only applicable to safety valves for compressible media. 3.5.15 Theoretical displacement theoreticalrelieving(discharge)capacity An ideal nozzle whose minimum cross-sectional area of the flow channel is equal to the flow channel area of the pressure relief valve or equal to the net flow area of the non-reclosing pressure relief device The calculated displacement. Note. The theoretical displacement is expressed in units of weight or volume. 3.5.16 Measuredrelieving(discharge)capacity The displacement of the pressure relief device measured at the rated discharge pressure. Note. The measured displacement is expressed in units of weight or volume. 3.5.17 Rated displacement ratedrelievingcapacity; certifieddischargecapacity The measured displacement is allowed to be used as the reference part of the pressure relief device by the applicable regulations or standards. 3.5.18 Equivalentcalculatedcapacity The calculated displacement of the pressure release device when the use conditions such as pressure, temperature or medium are different from the applicable conditions of the rated displacement. 3.5.19 Rated displacement coefficient ratedcoefficientofdischarge The ratio of rated displacement to theoretical displacement. 3.5.20 Frequency hopping chatter The disc of the pressure release valve moves back and forth quickly and abnormally, and the disc contacts the valve seat during the movement. 3.5.21 Flutter The disc of the pressure release valve moves back and forth quickly and abnormally, and the disc does not touch the valve seat during the movement. 3.5.22 Reference conditions The conditions of the test medium specified by the applicable standards or by the agreement between the test parties can be used to unify the results of the displacement test.4 General4.1 The measurement deviation of the test in this document is specified as follows. For the displacement test, the deviation of the final displacement measurement should not exceed the measured value. ±2.0%; for the action performance test, the deviation of the pressure measurement should not exceed ±0.5% of the measured value; for the test in use and the setting on the workbench For pressure test, the deviation of pressure measurement should not exceed ±1.0% of the measured value. 4.2 For the tests specified in this document, the test device should have the pressure and sufficient capacity required by the tested pressure release device, and should meet The pressure release device or pressure release valve discharge pressure test needs, and the test duration should meet the required action under stable conditions The need for performance and displacement data. The test operating conditions shall be maintained in accordance with the requirements of the test procedure. 4.3 On-site installation or abnormal operating conditions may adversely affect the function of the pressure relief device. Evaluate the pressure relief device in The applicability and reliability under such conditions are outside the scope of this document. 4.4 If there is a big difference between the temperature of the medium used in the pressure release device test and the temperature the device is subjected to in actual use, the The functional characteristics in actual use, such as opening pressure, opening and closing pressure difference, and burst pressure, will be different from those obtained from the test. Consider these differences The content of making appropriate amendments to the pressure relief device under test conditions does not belong to the scope of this document. 4.5 This document provides recommended test procedures and test instruments. As long as other test procedures and test instruments can be proved to have at least the If the document requires equivalent accuracy and reliability, it can be used. If other procedures and instruments are to be used, the test should be obtained before the test Written consent of the parties concerned. 4.6 The test results shall be reported according to measurement and calculation. Only when the test fully complies with the mandatory requirements of this document can it be designated It is a test conducted in accordance with this document. 4.7 The parties involved in the test shall deal with the design and overpressure protection of the piping system and components, the safe discharge of the pressure release device during the test, and the general Special consideration is given to the high noise that accompanies the emission to ensure that the test device meets the minimum mandatory requirements. 4.8 The parties to the test shall reach an agreement on the following matters before conducting the test. a) Test purpose; b) Test site, test parties, test and test supervisors; c) The benchmark condition of the test fluid under the rated discharge pressure; d) Test methods, instruments and equipment used in the test (the calibration of the instrument should be in accordance with 5.1.2); e) The number, diameter, type, condition, source, set pressure and expected displacement of the tested device; f) Written test procedures, the procedures should include the observations and readings that should be recorded in order to meet the purpose of the test. 4.9 Qualifications and responsibilities of test supervision test personnel. a) The test supervisor should have received education in thermodynamics and fluid mechanics, and have practical experience in fluid flow measurement. Experience in supervising trials. b) During the test, the test supervisor should observe the test conditions throughout the process and the operating personnel should fully understand the correctness of these operations. Definite method. c) The test supervisor shall be responsible for ensuring that the written test procedures are followed, and shall sign the test report or verification report.5 Pressure release device action performance and displacement test5.1 Test equipment and instruments 5.1.1 Test device The layout of the test device is shown in Figure 2~Figure 7 and Figure 9. To ensure its accuracy within the expected use range. 5.1.2.6 Steam calorimeter The steam calorimeter should be calibrated at the time of its installation and within the specified period. When the measurement result shows that the reading is obviously wrong At time or after reinstallation, calibration should be performed again. 5.1.2.7 Flowmeter combination The calibration of the flowmeter should include the actual pipes and all accessories on the upstream and downstream sides of the flowmeter. The connection between the container and the valve. The calibration should be completed before the execution of the formal test by the method of comparison, that is, the flow measurement value should be calibrated in advance. The value measured by the accurate flowmeter device is compared, and the latter's calibration is done with the aid of the original device or mechanism. About pre-calibration The agreement of the flow meter device should make the deviation of the final overall test result within ±2.0%. The calibration should be at the smallest, Performed at middle and maximum flow. For valves with different inlet connection forms, the connections should be made by laboratory personnel during manufacture or purchase. Calibration by the operator. In addition, the flow meter device should be recalibrated at least once every 5 years as described above. This recalibration should include the use of at least two Various sizes of connectors. Calibration records should be kept and audited by relevant parties. If a change is made to the equipment, it should be assessed that the change may affect the system. For the impact of system calibration, a new calibration should be performed when deemed necessary. 5.1.3 Adjustments in the test When collecting data, no adjustments should be made to the pressure release device. After any change or deviation of the test conditions, adequate Time allows the flow, temperature and pressure to stabilize before collecting data. 5.1.4 Test records and test results The test record should include all observations, measurements, meter readings and meter calibration records (when needed) of the test object. Original test record The records should be kept by the institution conducting the test. Copies of all test records should be submitted to all parties to the test. The correction and correction value should be loaded into the test record separately record. The test summary report shall be made in accordance with the provisions of 5.6. 5.1.5 Measurement error Preliminary tests should be carried out to determine that the specified instruments and procedures can meet the error limits specified in 4.1 for the final displacement measurement. limit. An error analysis after the test should also be performed, unless all parties to the test agree and verify that the specified instruments and procedures including the discreteness of the data are based on The test specifications are used and executed to confirm that the error determined by the preliminary test is still valid after the test. The error determination should be determined by the shape of the test chamber Documented for review. 5.2 Measurement method 5.2.1 Atmospheric pressure measurement Atmospheric pressure should be measured with a barometer. When calculating including displacement, if the rated discharge pressure of the pressure relief device is equal to or higher than At 0.15MPa (gauge pressure), the average atmospheric pressure of the test area can meet the accuracy requirements of this document. On this occasion, the recorded The pressure can be average atmospheric pressure. 5.2.2 Temperature measurement The requirements for temperature measurement are as follows. a) According to the operating conditions, temperature measurement can use glass tube liquid thermometer, bimetal thermometer, resistance thermometer or thermoelectric I. The glass tube liquid thermometer should be inserted into the sleeve, and the bimetal thermometer, resistance thermometer or thermocouple can be directly inserted into the tube In the channel, it can also be inserted into the casing. When the temperature is lower than 150℃, the temperature measuring device should be directly inserted into the pipeline without additional casing. b) When taking any temperature measurement, the following measures should be taken. 1) Except for the measured medium, there should be no large heat transfer between the temperature measuring device and the outs......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 12242-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 12242-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 12242-2021_English with my colleagues?Answer: Yes. 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