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GB/T 30040.2-2013 English PDF

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GB/T 30040.2-2013: Leak detection systems -- Part 2: Pressure and vacuum systems
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Basic data

Standard ID GB/T 30040.2-2013 (GB/T30040.2-2013)
Description (Translated English) Leak detection systems -- Part 2: Pressure and vacuum systems
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G93
Classification of International Standard 23.020.01; 23.040.99; 29.260.20
Word Count Estimation 23,256
Quoted Standard GB/T 30040.1; GB/T 30040.4; GB/T 30040.7; EN 764
Adopted Standard BS EN 13160-2-2003, NEQ
Regulation (derived from) National Standards Bulletin No. 25 of 2013
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard provides an overview of the storage of water polluting liquids Class I double-system leak detection system, double gap, vacuum and pressure leak detector, test, leak proof lining, anti-leakage jackets and flags. This standard applies to stor

GB/T 30040.2-2013: Leak detection systems -- Part 2: Pressure and vacuum systems

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Leak detection systems Part 2.. Pressure and vacuum systems ICS 23.020.01; 23.040.99; 29.260.20 G93 National Standards of People's Republic of China Double tank leak detection system Part 2. Pressure and vacuum systems Issued on. 2013-12-17 2014-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 4 Symbols and 1 5 2 Overview 6 2 double gap 7 vacuum and pressure leak 2 8 Test 5 9 leakproof liner 13 10 leak-proof jacket 13 11 13 Flag Appendix A (normative) pressure relief valve type tests 14 Appendix B (normative) drying filter design 17 Figure 1 alarm point is 30kPa leak flow rate of Example 3 Figure 2 type test test apparatus 6 Figure 3 is a pressure leak test device characteristic curve 7 4 vacuum leak detector test device characteristic curve 8 Temperature Figure 5 -25 ℃ ~ 25 ℃ between the curve 9 Temperature Figure 6 70 ℃ ~ 25 ℃ between the curve 9 Vacuum leak detection test device 7 Sirens test required 10 8 test equipment required for the test cut-off valve 12 in FIG. Figure A.1 pressure relief valve test apparatus required for the test 15

Foreword

GB/T 30040 "double-tank leak detection system" is divided into seven sections. --- Part 1. General; --- Part 2. Pressure and vacuum systems; --- Part 3. Tank Liquid media systems; --- Part 4. double or facilities used in anti-leakage gap liquid or vapor sensor systems; --- Part 5. Tank level gauge leak detection systems; --- Part 6. Monitoring Wells sensor display system; --- Part 7. Double gap, anti-seepage lining and general requirements and test methods for anti-leakage jacket. This section GB/T Part of 230,040. This section drafted in accordance with GB/T 1.1-2009 given rules. The technical content portion BSEN13160-2.2003 "leak detection systems - Part 2. Pressure and vacuum systems" (in English) Consistent. This part is proposed by the State Administration of Work Safety. This part of the National Security Chemical Safety Production Standardization Technical Committee Technical Committee (SAC/TC288/SC3) centralized. Double gap 6.8 double pipe connecting pipe should be located at both ends of the pipeline, which should be connected to a communication pipe leak detector.

7 vacuum and pressure leak detectors

7.1 Overview 7.1.1 system of vacuum or pressure, including pressure changes caused by changes in temperature, should not exceed the tank, anti-seepage lining, leakproof Design parameters jacket or pipe. Among them, in accordance with Appendix A, under the conditions of pressure relief valve, the pressure can be more than double the gap allowed 90% of the maximum allowable pressure. 7.1.2 vacuum system vacuum pipe line leak detectors located and double gap between, each of which should be installed at a low condensate yield Collection device. 7.1.3 Leak detector system should be set calibration parameters (such as pressure switch threshold adjustment) and analog alarm system. 7.1.4 Leak communicating tube diameter and the gap between the double should be minimized. a) the communication medium is air having an inner diameter of 6mm; b) the communication medium is an inert gas having an inner diameter of 4mm. 7.1.5 Leak and double tank communicating pipe or double pipe between the gas flow when the flow rate of (85 ± 15) L/h, the total flow resistance should not exceed Too 1kPa. In the air as the media system, when the communication pipe length l is less than or equal to 50m, its inner diameter should be 6mm. 7.1.6 communication pipe leak detectors and double the gap between the labeling provisions should comply with the following colors. --- Measuring tube. red; --- Exhaust pipe or pressure pipe. white or colorless and transparent; --- Exhaust pipe. green. 7.1.7 a vacuum leak can only be used a tank or a pipeline. 7.1.8 a pipeline can contain multiple duct portion, which double the gap should communicate with each section. 7.1.9 Leak in generating (85 ± 15) L/h gas flow rate should trigger an alarm, see Figure 1. Force change. 7.3 vacuum leak detector 7.3.1 Overview 7.3.1.1 bilayer pressure should be maintained within the gap between subatmospheric negative pressure until a leak occurred before. 7.3.1.2 Vacuum leak detector for double flat tank should be able to withstand the expected pressure leak occurs. 7.3.1.3 alarm should ensure its reliability in accordance with 7.3.2, if not ensure, in conformity with GB/T 30040.4 double gap in most Low vacuum leak detector in addition to outside, and then install a liquid sensor. 7.3.2 Reliability alert 7.3.2.1 As a reliable guarantee, the vapor space should be double the gap increases leakage of the liquid is reduced, see equation (3). V = 1- 100000Pa-pPA 100000Pa-p AE × 100% (3) 7.3.2.2 preset alarm pressure pAE double gap is based on penetration of liquid (leakage has occurred) compared to the lowest point of the tank has risen To h1, see formula (4). h1 = pAE g × ρP Or h1 = pAE g × ρG (4) 7.3.2.3 should be based on the geometry of the tank, calculate the gap in the double injection of liquid leakage when the height h1 volume (in liters or metering), See GB/T 30040.7. 7.3.2.4 if the following conditions are considered reliable alarms, see equation (5). V < V1 V0 According to GB/T 30040.7. 10 leak-proof jacket According to GB/T 30040.7. 11 logo According to GB/T 30040.1, in addition. --- The maximum or minimum allowable pressure; --- If you use a cut-off valve or a condenser, shall be marked with their rated pressure and composition of the shell material.

Appendix A

(Normative) Type test pressure relief valve A.1 Symbols and p0 the set pressure units. Pa (Pa) Fe exhaust rate, unit. liter/hour (L/h) And the exhaust gas pressure Δp p0 Fe rate differential, unit. Pa (Pa) pc termination pressure units. Pa (Pa) p0m measured set pressure units. Pa (Pa) pcm measured termination pressure units. Pa (Pa) A.2 test device Test device consists of the following components. a) Pressure test vessel with a volume of 1L, at least two nozzles connected to a pressure pump and a pressure relief valve; b) the environment (simulation) box, the temperature can range from -25 ℃ ~ 70 ℃ changes, accuracy 2K; c) For the temperature range of -40 ℃ ~ 40 ℃ test, its environment (simulation) oven temperature range should be -50 ℃ ~ 40 ℃, Accuracy 2K; d) a pressure pump or air compressor; e) servo control valves, pressure sensors and pressure programmable controller with an accuracy of 0.5% of the specified set pressure; f) not more than two times the specified range set a pressure measuring device (for example. pressure gauge); g) gas flow meter accuracy for the range (at least 300L/h) 1%; h) sink. A.3 ready Pressure relief valve should be installed as shown in Figure A.1. Test vessel and pressure relief valve should be connected to the environment (simulation) box. A.4 Assessment A.4.1 Test valve should be evaluated according to the following parameters given by the manufacturer. --- Set pressure, p0; --- Exhaust rate under pressure p0 Δp, Fe; --- Termination pressure, pc; --- Operating temperature range, namely the underground, anti-frost or outdoor installation. A.4.2 If p0, p0 Δp and pc values \u200b\u200bmeasured before and after the durability test are given by the manufacturer in a difference of 5% or less, the test by. In addition, when the pressure is lower than the termination of pressure, without air through the valve. A.7.7 durability test procedures according A.6 cycle 1 × 103 times. A.7.8 environmental (analog) set oven temperature (20 ± 5) ℃, and maintain. A.7.9 A.5 performed according to parameter test procedure. A.8 Test Results In accordance with A.7.2 and A.7.9 record p0m, p0m Δp pcm and value, respectively, with the manufacturer of p0, p0 Δp and pc Compared to the value. If all measured values \u200b\u200bare within ± 5% of the value specified by the manufacturer, type approval is given. Otherwise, the test fails.

Appendix B

(Normative) Dry filter design B.1 Overview Drying filter to a closed system is a prerequisite, according to a certain sized, so you do not replace within a year. B.2 Symbols and p1 pPA 100000, unit. Pa (Pa) p2 pPE 100000, unit. Pa (Pa) p3 pAE 100000, unit. Pa (Pa) p4 pSV 100000, unit. Pa (Pa) (PSV = pressure relief valve opening pressure of the relative value), unit. Pa (Pa) pm (p1 p2)/2 Average working pressure (absolute), unit. Pa (Pa) T0 15 ℃ = 288K T1 T0 ΔT2 T2 T1 7.5K ΔT1 according to incremental (B.1) temperature unit. On [Kelvin] (K) ΔT2 according to the incremental (B.2) temperature unit. On [Kelvin] (K) m1 at a temperature T1 and pressure p4 air quality m2 at a temperature T2 and pressure p4 air quality ma per kilogram of dried silica particles mass absorbed moisture, unit. g/kilogram (g/kg) msch dried silica particles gross weight, unit. kg/m 3 (kg/m3) V0 extracted air volume (leak detector is discharged through the valve), unit. m 3 (m3) Volume Vk double gap = 1m3 The maximum volume Vmax leak detector for double gap, unit. m 3 (m3) VTF filter drier volume, unit. liter (L) Conventional gas constant R (here, air) = 287J/(kgK) Air flow rate QL leakage caused unit. m 3/year (m3/a) The air flow rate Qs exceeds the pressure relief valve to open when the pressure caused by temperature changes, unit. m 3/year (m3/a) Qgas total flow rate of air (Qs QL), unit. m 3/year (m3/a) B.3 dry filter air flow rate B.3.1 Temperature Effect Because of a gap in the double rise in temperature leads to a pressure increase of the reaction pressure relief valve, the pressure relief valve is equal to the amount of gas dried NOTE filter exhaust air flow full amount again. Referring to the output pressure in accordance with Equation (B.1) temperature increment derived as follows. ΔT1 = T0 (p4/p1-1) (B.1) Taking into account the average working pressure pm, according to the formula (B.2) derived ΔT2. ΔT2 = T0 (p4/pm-1) (B.2) Therefore, the temperature T1 can be calculated according to equation (B.3). T1 = T0 ΔT2 (B.3) Therefore, only the temperature is greater than from the time T0 to T1, the pressure relief valve will cause a reaction. The average temperature increase leak detection medium exceeds T1 (dry air), then that takes into account the following temperature higher than the average temperature of the warm summer. --- After 60 days the temperature rises 10K (greater than T1); --- 60 days temperature 5K (greater than T1). The average temperature increment mentioned before, if within the 120d reaches 7.5K, should also be taken into account. B.3.2 loss calculation Calculate the air quality in accordance with the formula (B.4) and formula (B.5). m1 = (p1 × Vk)/(R × T1) (B.4) m2 = (p2 × Vk)/(R × T2) (B.5) , The resulting air quality emissions according to formula (B.6) by the formula (B.5) minus formula (B.4). Δm = Vk/R × p1 T1- p2 (B.6) Thus, the formula (B.7) gives the emissions of. V0 = Δm × R × T0/p0 = T0/p0 × Vk × p1 T1- p2 (B.7) Double gap unit of measurement. cubic meter/cubic meter (m3/m3) It shall be calculated by the following formula (B.8) according to the filter by drying air flow rate. Qs = V0 × 120 (B.8) B.3.3 impact of leakage Suppose leak detection system, there are 2.0L/d average leak rate that 0.73m3/a. B.3.4 Results According to the formula (B.9) obtained dried filter air flow should be. Qgas = Qs QL (B.9) Double gap volume by 1m3 dollars. B.4 filter drier volume calculation For ease of calculation, temperature 30 ℃, humidity of 80% air. Moisture in air at atmospheric pressure conditions fL = 25mL/m3 = 0.025kg/m3. Install filter drier, so that air drawn according to equation (B.9) flow rate of drying to a residual moisture content of at least 10%. That is according to the following Formula (B.10) calculated in dry filled with dried silica particles filter year after the volume.

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