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Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB 27790-2011 City gas pressure regulators. In addition to editorial changes, the following main technical changes have been made with respect to GB 27790-2011: ——The scope is modified (see clause 1; clause 1 of Edition 2011); ——Some terms and definitions are modified or added (see clause 3; clause 3 of Edition 2011); ——The classification and model designation are modified (see clause 4; clause 4 of Edition 2011); ——The structure and material are modified (see clause 5; clause 5 of Edition 2011); ——The special requirements for meter pressure regulator are added (see 5.2.3 and 6.13); ——The technical requirements for nondestructive testing of steel pressure-bearing parts are added (see 5.3.2.5); ——The technical requirements for fail state, integrated shut-off device, integrated monitor and integrated release device are added (see 6.9, 6.10, 6.11 and 6.12); ——The requirements for gas strength test are added (see 7.3.1); ——The methods for gas resistance test of diaphragm and low-temperature resistance test of diaphragm are modified (see 7.4.2 and 7.4.3; 7.4.2 and 7.4.3 of Edition 2011); ——The requirement that no intermediate static characteristic test be conducted when the applicable range of inlet pressure and outlet pressure of pressure regulator is too narrow is added (see 7.6.1.1); ——The inspection method for failure state is added (see 7.10); ——The test method for integrated shut-off device is added (see 7.11); ——The test method for integrated monitor is added (see 7.12); ——The test method for integrated release device is added (see 7.13); ——The test methods for torsion resistance and bending resistance of meter pressure regulator are added (see 7.14); ——the inspection rules are modified (see clause 8; clause 8 of Edition 2011); ——The marking and label of pressure regulator are modified (see 9.1; 9.1 of Edition 2011); ——The operating instructions of pressure regulator are modified and the requirements for providing noise and corresponding operating conditions are added (see 9.2; 9.2 of Edition 2011); ——The physical and mechanical properties of rubber materials as well as gas resistance are modified (see Annex A; Annex A of Edition 2011). This standard was proposed by and is under the jurisdiction of the Ministry of Housing and Urban-Rural Development of the People's Republic of China. The previous edition of this standard is as follows: ——GB 27790-2011. City gas pressure regulator 1 Scope This standard specifies terms, definitions and symbols, classification and labelling, structure and materials, requirements, test methods, inspection rules, marking, label and operating instructions as well as packaging, transport and storage of city gas pressure regulator (hereinafter referred to as pressure regulator). This standard is applicable to the pressure regulators with a nominal diameter up to 400mm, an operating temperature range not exceeding -20℃~60℃ with the lower limit not less than the dew point temperature of the gas, and an inlet pressure up to 10.0MPa. This standard is not applicable to the pressure regulators for liquefied petroleum gas in cylinders and those for dimethyl ether. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 150 (all parts) Pressure vessel GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness) GB/T 699 Quality carbon structure steels GB/T 1047 Pipework components - Definition and selection of nominal size GB/T 1173 Casting aluminium alloy GB/T 1220 Stainless steel bars GB/T 1239.2 Cold coiled helical springs technical specifications - Part 2: Compressions spring GB/T 1348 Spheroidal graphite iron castings GB/T 1591 High strength low alloy structural steels GB/T 1681 Rubber - Determination of rebound resilience of vulcanizates GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids GB/T 3077 Alloy structure steels GB/T 3191 Aluminium and aluminium alloys extruded bars, rods GB/T 3280 Cold rolled stainless steel plate, sheet and strip GB/T 3452.1 Fluid power systems - O-rings - Part 1: Inside diameters, cross-sections, tolerances and size identification code GB/T 3452.2 Fluid power systems - O-rings - Part 2: Quality acceptance criteria GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method GB/T 4423 Copper and copper-alloy cold-drawn rod and bar GB/T 6388 Transport package shipping mark GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Parallel internal and taper external threads GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads GB/T 7759 (all parts) Rubber, vulcanized or thermoplastic - Determination of compression set GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test GB/T 9124.1 Steel pipe flanges - Part 1: PN designated GB/T 9124.2 Steel pipe flanges - Part 2: Class designated GB/T 9440 Malleable iron castings GB/T 9443 Steel and iron castings - Liquid penetrant inspection GB/T 9444 Steel and iron castings - Magnetic particle inspection GB/T 9969 General principles for preparation of instructions for use of industrial products GB/T 12224 General requirements for industrial steel valves GB/T 12227 General purpose industrial valve - Specification of spheroidal graphite iron castings GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings GB/T 12229 General purpose industrial valves - Specification of carbon steel castings GB/T 12716 Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads GB/T 13306 Plates GB/T 13384 General specifications for packing of mechanical and electrical product GB/T 13934 Rubber, vulcanized or thermoplastic - Determination of flex cracking and crack growth (De Mattia) GB/T 15115 Die casting aluminium alloys GB/T 17213.15 Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method GB/T 20801.5 Pressure piping code - Industrial piping - Part 5: Inspection and testing GB/T 23934 Hot formed helical compression springs - Technical Requirement GB/T 32249 Aluminum and aluminum-alloy die forgings, hand forgings and rolled ring forgings - General specification GB/T 38343 Technical specification for flange joints installation GB 50058 Code for design of electrical installations in explosive atmospheres CJ/T 180-2014 Manually operated gas valves for gas installations of buildings CJ/T 335-2010 Slam-shut valves and relief valves for city gas HG/T 20592 Steel pipe flanges (PN designated) HG/T 20615 Steel pipe flanges (Class designated) JB/T 6440 Methods of radiographic examination for steel castings valves JB/T 7248 Technical specification for low temperature service steel casting for valves JB/T 7927 Valve cast steel visual quality requirements JB/T 7944 Coiled helical springs - Sampling inspection NB/T 47008 Carbon steel and alloy steel forgings for pressure equipment NB/T 47009 Alloy steel forgings for low temperature pressure equipment NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment NB/T 47013 (all parts) Nondestructive testing of pressure equipments 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1.1 gas pressure regulator equipment whose function is to automatically regulate the gas outlet pressure to maintain it within certain pressure range 3.1.2 series of pressure regulator generic term for pressure regulators with the same design concept, similar structure but different nominal diameter 3.1.3 direct acting pressure regulator pressure regulators which have a direct control by virtue of the outlet pressure variation over the actuator which drives the control members to move Note: See Figure 1 for an example of the action principle of the direct acting pressure regulator. Key: 1——setting element; 2——actuator; 3——diaphragm; 4——sensing line; 5——valve seats; 6——seat ring; 7——regulator body; 8——control member; 9——casing of actuator; 10——breather/exhaust line; 11——metallic partition; 1＋3——controller; Figure 1 Example of direct acting pressure regulator 3.1.4 indirect acting pressure regulator pressure regulators which control by virtue of the outlet pressure variation over the actuator which drives the control members to move after the amplification of the pilot Note: See Figure 2 for an example of the indirect acting pressure regulator. Key: 1——pilot; 2——process line; 3——actuator; 4——sensing line; 5——motorization chamber; 6——valve seats; 7——seat ring; 8——regulator body; 9——control member; 10——metallic partition; 11——casing of actuator; Figure 2 Example of indirect acting pressure regulator 3.1.5 meter pressure regulator pressure regulator installed in front of the user's gas meter, with a nominal diameter not greater than DN25 and a maximum inlet pressure not greater than 0.2 MPa 3.1.6 integrated monitor pressure regulating unit connected in series with the working pressure regulator, which starts to operate when the outlet pressure of the pressure regulator exceeds the set range of the working pressure regulator to maintain the outlet pressure of the pressure regulator within the allowable range 3.1.7 nominal diameter of pressure regulator nominal diameter of pressure regulator inlet, indicating pressure regulator dimensions. 3.1.8 nominal pressure numerical marking code concerned to pressure, rounded to an integral Note: In this standard, it is used to express the nominal pressure at inlet and outlet flange of the pressure regulators. 3.1.9 design pressure pressure value which is used to determine strength of the casing or other parts at appropriate design temperature 3.1.10 inlet pressure range pressure range within which the given accuracy class at pressure regulator inlet is guaranteed Note: The same pressure regulator may have different inlet pressure ranges. 3.1.11 maximum inlet pressure maximum inlet pressure value permissible within inlet pressure range 3.1.12 minimum inlet pressure minimum inlet pressure value permissible within inlet pressure range 3.1.13 outlet pressure range pressure range within which the given accuracy class at pressure regulator outlet is guaranteed Note: The same pressure regulator may have different outlet pressure ranges, and the pressure regulator may obtain the required outlet pressure range by replacing certain parts. 3.1.14 maximum outlet pressure maximum outlet pressure value permissible within outlet pressure range 3.1.15 minimum outlet pressure minimum outlet pressure value permissible within outlet pressure range 3.1.16 reference conditions gas state where the temperature is 15℃ and absolute pressure is 101.325 kPa 3.1.17 volumetric flow rate gas volume in reference conditions which flows through the pressure regulator in unit time Note: The unit is m3/h. 3.1.18 flow coefficient air flow passed when the absolute pressure is opened fully at the critical condition where the inlet absolute pressure is 0.243kPa and the temperature is 15℃ Note: The unit is m3/h. 3.1.19 performance expressing the outlet pressure as a function of the inlet pressure and volumetric flow rate 3.1.20 performance curve graphic representation of the outlet pressure as a function of the volumetric flow rate by changing volumetric flow rate (from increase to decrease) in case of constant inlet pressure and adjustment condition Note: This standard adopts the performance curve when the inlet temperature is 15℃. 3.1.21 family of performance curves set of performance curves obtained at different inlet pressures in the same adjustment condition 3.1.22 set point nominal outlet pressure of a family of performance curves of the pressure regulator Note: The set point may be equal to the rated outlet pressure. 3.1.23 hysteresis band difference between two outlet pressure values corresponding to the same volumetric flow rate when the volumetric flow rate increases and decreases on one performance curve 3.1.24 motorization pressure gas pressure within high pressure chamber of pressure regulator actuator 3.1.25 stable conditions conditions where the outlet pressure are gradually changing to a stable value after interference generation 3.1.26 accuracy percentage of average value of the absolute values of maximum positive deviation and maximum negative deviation between actual outlet pressure and set point within operating range on the same family of performance curves to the set point 3.1.27 accuracy class maximum permissible value of accuracy multiplied by 100 3.1.28 lock-up pressure outlet pressure at zero volumetric flow rate on performance curve when the control member of pressure regulator is at a lock-up position Note: The time from the volumetric flow rate at lock-up point to the zero volumetric flow rate shall be greater than the response time for locking up the pressure regulator. 3.1.29 lock-up pressure class maximum permissible value of ratio of difference between actual lock-up pressure and set point to set point multiplied by 100 3.1.30 maximum accuracy flow rate minimum one among the maximum flow rates capable of guaranteeing the given accuracy class for inlet pressure range under specified set point 3.1.31 minimum accuracy flow rate maximum one among the minimum flow rate or the minimum flow rate in quiescent operation capable of guaranteeing the given accuracy class for inlet pressure range under specified set point 3.1.32 lock-up pressure zone zone between zero flow rate and minimum flow rate on each corresponding performance curve of inlet pressure and set point (see Zone 1 in Figure 3) Key: p2——outlet pressure; p1——inlet pressure; AC——accuracy class; SG——lock-up pressure class; Q——volumetric flow rate; Qmax,p1——maximum flow rate under p1; p2s——set point; Qmin,p1——minimum flow rate under p1; 1——lock-up pressure zone SZ. Figure 3 Lock-up pressure zone (stable condition) 3.1.33 class of lock-up pressure zone maximum permissible value of ratio of minimum flow rate to maximum flow rate multiplied by 100 3.1.34 class of lock-up pressure zone of family of performance curves maximum permissible value of ratio of minimum accuracy flow rate to maximum accuracy flow rate on the family of performance curves multiplied by 100 3.1.35 operating temperature range temperature range of medium and body in which the pressure regulator components and additional devices are capable of operating normally 3.1.36 control member movable element installed in the flow passage of the pressure regulator, which is used for controlling the opening degree of the flow passage of the pressure regulator 3.1.37 fail close pressure regulator pressure regulator that automatically closes or tends to close when the main diaphragm fails or the power system that moves the control member fails 3.1.38 fail open pressure regulator pressure regulator that automatically opens or tends to open when the main diaphragm fails or the power system that moves the control member fails 3.1.39 integrated release device self-actuated release unit installed on the pressure regulator body and, when the control pressure reaches the release pressure set value, releasing gas to the atmosphere with limited flow rate 3.1.40 integrated shut-off device self-actuated shut-off device installed on the pressure regulator body Note: It is characterized in that when the pressure regulator works normally, the integrated shut-off device is on, when the pressure at the outlet of the pressure regulator reaches the set value of shut-off pressure, the gas passage is automatically cut off by virtue of the gas pressure at the outlet of the pressure regulator, and the actuator is reset manually after troubleshooting the gas system. 3.2 Symbols For the purposes of this standard, the symbols listed in Table 1 apply. Table 1 Symbols and explanations S.N. Symbol Unit Explanation 1 A % Accuracy 2 Amin % Elongation 3 AC — Accuracy class 4 AQ — Shut-off pressure accuracy class 5 Cg — Flow coefficient 6 Cgi — Flow coefficient under test conditions 7 Cgx — Flow coefficient of pressure regulator under partial opening 8 DN — Letter symbol before nominal diameter identification 9 d — Relative density of test medium 10 K1j — Shape coefficient under test conditions 11 K1 — Shape coefficient 12 m — Number of test conditions under subcritical flow condition in the flow coefficient Cg test 13 n — Number of test conditions under critical flow condition in the flow coefficient Cg test 14 p MPa Design pressure 15 p1 MPa Inlet pressure 16 p1av MPa Medium value between maximum inlet pressure and minimum inlet pressure 17 p1t Pa Pressure of test medium in the pressure-bearing chamber at the first measurement 18 p1max MPa Maximum inlet pressure 19 p1min MPa Minimum inlet pressure 20 p2 MPa Outlet pressure 21 p2c MPa Initial outlet pressure 22 p2t Pa Pressure of test medium in the pressure-bearing chamber at the second measurement 23 p2int MPa Initial outlet pressure between p2min and p2max 24 p2max MPa Maximum outlet pressure within outlet pressure range 25 p2min MPa Minimum outlet pressure within outlet pressure range 26 p2s MPa Set point 27 pa MPa或Pa Atmospheric pressure 28 pb MPa Lock-up pressure 29 pb1 MPa Pressure obtained by carrying out thermometric correction for lock-up pressure measured at the first time in the lock-up pressure test 30 pb2 MPa Pressure obtained by carrying out thermometric correction for lock-up pressure measured at the second time in the lock-up pressure test 31 pn Pa Reference pressure 32 pta MPa Actual value of shut-off pressure 33 pts MPa Set value of shut-off pressure 34 MPa Lock-up pressure measured at the second time in the lock-up pressure test 35 pmax MPa Maximum design pressure 36 Q m3/h Volumetric flow rate 37 Qi m3/h Calculated leakage of a pressure-bearing chamber 38 Qm m3/h Volumetric flow rate measured when pressure regulator inlet temperature is t1 39 Qmax m3/h Maximum flow rate 40 Qmax, p1min m3/h Maximum flow rate when inlet pressure is p1min 41 Qmax, p1 m3/h Maximum flow rate at a certain inlet pressure 42 Qmin m3/h Minimum flow rate 43 Qmin, p1 m3/h Minimum flow rate at a certain inlet pressure 44 Qmin, p1av m3/h Minimum flow rate when inlet pressure is p1av 45 Qmin, p1min m3/h Minimum flow rate at minimum inlet pressure 46 Qmin, p1max m3/h Minimum flow rate at maximum inlet pressure 47 QL m3/h Maximum test volumetric flow rate of a characteristic line 48 QR m3/h Maximum flow rate provided by test bench 49 SG — Lock-up pressure class 50 SZ — Class of lock-up pressure zone 51 SZp2 — Class of lock-up pressure zone of family of performance curves 52 t h Pressure-holding time 53 t1 ℃ Test medium temperature in front of pressure regulator 54 t1t ℃ Temperature of test medium within pressure-bearing chamber during the measurement for the first time 55 t2t ℃ Temperature of test medium within pressure-bearing chamber during the measurement for the second time 56 tb1 ℃ Pressure regulator outlet temperature measured for the first time in the lock-up pressure test 57 tb2 ℃ Pressure regulator outlet temperature measured for the second time in the lock-up pressure test 58 V m3 Volume of pressure-bearing chamber 59 △＋ MPa Positive deviation between actual value and set point of outlet pressure 60 △－ MPa Negative deviation between actual value and set point of outlet pressure 61 △p MPa Minimum differential pressure at inlet and outlet at which the accuracy class may be guaranteed by the pressure regulator 62 △t h Interval between two measurements 63 △ph Pa Hysteresis band 64 △pt Pa Corrected pressure drop 65 △pmax MPa Maximum differential pressure borne by diaphragm 66 δ5 % Elongation of steels 67 δp1 MPa Inlet pressure range 68 δp2 MPa Outlet pressure range 4 Classification and model 4.1 Classification The classification of pressure regulators shall meet the requirements of Table 2. Table 2 Classification of pressure regulators S.N. Classification method Category 1 Working principle Action mode Direct acting, and indirect acting Failure state Fail-open, and fail-close 2 Connection type Flange, and thread 3 Maximum inlet pressure/MPa 0.01, 0.2, 0.4, 0.8, 1.6, 2.0, 2.5, 4.0, 6.3 and 10.0 4.2 Model 4.2.1 Model preparation Product model preparation shall meet the following requirements: a) The model preparation of pressure regulators shall be in the following format: b) The working principle code of pressure regulators shall meet the requirements of Table 3; Table 3 Operating principle codes of pressure regulator Operating principle code Operating principle Action mode Failure state Direct acting Indirect acting Fail open Fail close Z1 √ - √ - Z2 √ - - √ J1 - √ √ - J2 - √ - √ ZB √ - √ - Notes: 1. "√" indicates that it is applicable; "-" indicates that it is not applicable. 2 ZB represents the meter pressure regulator. c) The nominal diameter of pressure regulator refers to the nominal diameter of inlet connection; d) The maximum inlet pressure, p1max, is divided into 9 grades, i.e., 0.01MPa, 0.2MPa, 0.4MPa, 0.8MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.3MPa and 10.0MPa, with the pressure value in MPa marked. e) As for the connection type, L is for threaded connection, and the code is omitted in case of flanged connection; f) Custom numbers, including manufacturer-defined numbers, such as series of pressure regulator. 4.2.2 Example Examples for the models of pressure regulators are as follows: a) RTJ1-150/0.4-A, indicating a fail open indirect acting pressure regulator which has a nominal diameter of DN150, a maximum inlet pressure of 0.4 MPa and a custom number of A, and is subjected to flange connection; b) RTZB-15/0.01 L, indicating a meter pressure regulator which has a nominal diameter of DN15 and a maximum inlet pressure of 0.01MPa and is subjected to threaded connection. 5 Structure and material 5.1 General requirements 5.1.1 Design pressure 5.1.1.1 Metallic pressure-bearing parts The design pressure of metallic pressure-bearing parts (include metallic parts bearing pressure at normal operation or metallic parts bearing pressure after diaphragm and differential pressure seal fails) shall meet the following requirements: a) When the metallic pressure-bearing parts are subjected to inlet pressure p1, their design pressure shall not be less than the maximum inlet pressure and shall not be less than 0.4 MPa; b) When metallic pressure-bearing parts are protected by safety protection devices, and the pressure to which they are subjected after the diaphragm or differential pressure seal fails is less than the inlet pressure and greater than or equal to normal operating pressure, the design pressure of the metallic pressure-bearing parts shall not be less than 1.1 times the pressure borne by them after the failure of diaphragm or differential pressure seal, or the design pressure specified in Item a) may be adopted; c) For pressure-bearing parts which are subjected to a pressure less than the normal operating pressure after the failure of diaphragm or differential pressure seal, the design pressure shall not be less than 1.1 times the maximum normal operating pressure, or the design pressure specified in Item a) may be adopted; 5.1.1.2 Metallic partition The design pressure of metallic partition shall not be less than 1.1 times the difference between maximum pressure at high-pressure side and minimum pressure at low-pressure side, however the design pressure of metallic partition in the valve shall meet the requirements of 5.1.1.1a). 5.1.1.3 Diaphragm The design pressure of diaphragm shall meet the following requirements: a) When the maximum differential pressure, △pmax, borne by the diaphragm is less than 0.015 MPa, the design pressure of the diaphragm shall not be less than 0.02 MPa; b) When 0.015 MPa≤△pmax<0.5 MPa, the design pressure of the diaphragm shall not be less than 1.33△pmax; c) When △pmax≥0.5 MPa, the design pressure of the diaphragm shall not be less than 1.1△pmax and it shall not be less than 0.665 MPa. 5.1.2 Operating temperature range The operating temperature ranges of the pressure regulators shall be -10℃~60℃ or -20℃~60℃. 5.2 Structure 5.2.1 Connection type at inlet and outlet 5.2.1.1 The connection between the pressure regulator and the upstream and downstream pipelines shall meet the following requirements: a) The connection dimension and sealing surface type of the flange shall meet the requirements of GB/T 9124.1, GB/T 9124.2, HG/T 20592 or HG/T 20615. b) Pipe threads shall only be used for pressure regulators with a nominal diameter not greater than DN50, and shall meet the requirements of GB/T 7306.1, GB/T 7306.2 or GB/T 12716. 5.2.1.2 The nominal pressure of the flange shall not be less than the design pressure of the pressure regulator body, and shall be selected from the following series of values: 0.6 MPa, 1.0 MPa, 1.6 MPa, 2.0 MPa, 2.5 MPa, 4.0 MPa, 5.0 MPa, 6.3 MPa, 10.0 MPa and 11.0 MPa. 5.2.1.3 The nominal pressure of the inlet and outlet flanges of the pressure regulator shall be the same. Foreword i 1 Scope 2 Normative references 3 Terms, definitions and symbols 3.1 Terms and definitions 3.2 Symbols 4 Classification and model 4.1 Classification 4.2 Model 5 Structure and material 5.1 General requirements 5.2 Structure 5.3 Materials 6 Requirements 6.1 Appearance 6.2 Strength of pressure containing part 6.3 Inspection for finished product of diaphragm 6.4 External seal 6.5 Performance 6.6 Flow coefficient, Cg 6.7 Adaptability at limit temperature 6.8 Durability 6.9 Failure state 6.10 Performance of integrated shut-off device 6.11 Performance of integrated monitor 6.12 Performance of integrated release device 6.13 Torsion resistance and bending resistance of meter pressure regulator 7 Test methods 7.1 General requirements 7.2 Appearance 7.3 Strength of pressure-bearing parts 7.4 Inspection of finished diaphragm 7.5 External seal 7.6 Performance 7.7 Flow coefficient Cg 7.8 Adaptability at limit temperature 7.9 Durability 7.10 Failure state 7.11 Integrated shut-off device 7.12 Integrated monitor 7.13 Integrated release device 7.14 Torsion resistance and bending resistance of meter pressure regulator 8 Inspection rules 8.1 Inspection classification 8.2 Inspection items 8.3 End-of-manufacturing inspection 8.4 Type inspection 8.5 Judging rules 9 Marking, label and operating instructions 9.1 Marking and label 9.2 Operating instructions 10 Packaging, transport and storage 10.1 Packaging 10.2 Transport 10.3 Storage Annex A (Normative) Physical and mechanical properties of rubber materials and gas resistance Annex B (Informative) Storage of rubber parts of pressure regulators Annex C (Normative) Alternative method for determining flow coefficient of mass flow regulators Annex D (Informative) Flow characteristic Annex E (Informative) Noise 城镇燃气调压器 1 范围 本标准规定了城镇燃气用燃气调压器(以下简称调压器)的术语和定义、符号、分类与标记、结构和材料、要求、试验方法、检验规则、标志、标签、使用说明书以及包装、运输、储存。 本标准适用于进口压力不大于10.0 MPa、工作温度范围不超出20℃～60℃且其下限不低于燃气露点温度、公称尺寸不大于400 mm的调节出口压力的调压器。 本标准不适用于瓶装液化石油气调压器和二甲醚用的调压器。 2 规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。 GB／T 150(所有部分) 压力容器 GB／T 191 包装储运图示标志 GB／T 229 金属材料 夏比摆锤冲击试验方法 GB／T 528 硫化橡胶或热塑性橡胶 拉伸应力应变性能的测定 GB／T 531.1 硫化橡胶或热塑性橡胶 压入硬度试验方法 第1部分：邵氏硬度计法(邵尔硬度) GB／T 699 优质碳素结构钢 GB／T 1047 管道元件 公称尺寸的定义和选用 GB／T 1173 铸造铝合金 GB／T 1220 不锈钢棒 GB／T 1239.2 冷卷圆柱螺旋弹簧技术条件 第2部分：压缩弹簧 GB／T 1348 球墨铸铁件 GB／T 1591 低合金高强度结构钢 GB／T 1681 硫化橡胶回弹性的测定 GB／T 1682 硫化橡胶 低温脆性的测定 单试样法 GB／T 1690 硫化橡胶或热塑性橡胶 耐液体试验方法 GB／T 3077 合金结构钢 GB／T 3191 铝及铝合金挤压棒材 GB／T 3280 不锈钢冷轧钢板和钢带 GB／T 3452.1 液压气动用O形橡胶密封圈 第1部分：尺寸系列及公差 GB／T 3452.2 液压气动用O形橡胶密封圈 第2部分：外观质量检验规范 GB／T 3512 硫化橡胶或热塑性橡胶 热空气加速老化和耐热试验 GB／T 4423 铜及铜合金拉制棒 GB／T 6388 运输包装收发货标志 GB／T 7233.1 铸钢件 超声检测 第1部分：一般用途铸钢件 GB／T 7306.1 55°密封管螺纹 第1部分：圆柱内螺纹与圆锥外螺纹 GB／T 7306.2 55°密封管螺纹 第2部分：圆锥内螺纹与圆锥外螺纹 GB／T 7759(所有部分) 硫化橡胶或热塑性橡胶 压缩永久变形的测定 GB／T 7762 硫化橡胶或热塑性橡胶 耐臭氧龟裂 静态拉伸试验 GB／T 9124.1 钢制管法兰 第1部分：PN系列 GB／T 9124.2 钢制管法兰 第2部分：Class系列 GB／T 9440 可锻铸铁件 GB／T 9443 铸钢铸铁件 渗透检测 GB／T 9444 铸钢铸铁件 磁粉检测 GB／T 9969 工业产品使用说明书 总则 GB／T 12224 钢制阀门 一般要求 GB／T 12227 通用阀门 球墨铸铁件技术条件 GB／T 12228 通用阀门 碳素钢锻件技术条件 GB／T 12229 通用阀门 碳素钢铸件技术条件 GB／T 12716 60°密封管螺纹 GB／T 13306 标牌 GB／T 13384 机电产品包装通用技术条件 GB／T 13934 硫化橡胶或热塑性橡胶 屈挠龟裂和裂口增长的测定(德墨西亚型) GB／T 15115 压铸铝合金 GB／T 17213.15 工业过程控制阀 第8-3部分：噪声的考虑 空气动力流流经控制阀产生的噪声预测方法 GB／T 20801.5 压力管道规范 工业管道 第5部分：检验与试验 GB／T 23934 热卷圆柱螺旋压缩弹簧 技术条件 GB／T 32249 铝及铝合金模锻件、自由锻件和轧制环形锻件 通用技术条件 GB／T 38343 法兰接头安装技术规定 GB 50058 爆炸危险环境电力装置设计规范 CJ／T 180—2014 建筑用手动燃气阀 CJ／T 335—2010 城镇燃气切断阀和放散阀 HG／T 20592 钢制管法兰(PN系列) HG／T 20615 钢制管法兰(Class系列) JB／T 6440 阀门受压铸钢件射线照相检验 JB／T 7248 阀门用低温钢铸件技术条件 JB／T 7927 阀门铸钢件外观质量要求 JB／T 7944 圆柱螺旋弹簧抽样检查 NB／T 47008 承压设备用碳素钢和合金钢锻件 NB／T 47009 低温承压设备用合金钢锻件 NB／T 47010 承压设备用不锈钢和耐热钢锻件 NB／T 47013(所有部分) 承压设备无损检测 3 术语和定义、符号 3.1 术语和定义 下列术语和定义适用于本文件。 3.1.1 燃气调压器 gas pressure regulator 自动调节燃气出口压力，使其稳定在某一压力范围内的设备。 3.1.2 调压器系列 series of pressure regulator 相同设计原理下，结构相似的不同公称尺寸调压器的总称。 3.1.3 直接作用式调压器 direct acting pressure regulator 利用出口压力变化，直接控制驱动器带动调节元件运动的调压器。 注：直接作用式调压器的作用原理示例见图1。 说明： 1——设定元件； 2——驱动器； 3——膜片； 4——信号管； 5——阀座； 6——阀垫； 7——调压器壳体； 8——调节元件； 9——驱动器壳体； 10——呼吸孔； 11——金属隔板； 1＋3——控制器。 图1 直接作用式调压器示例 3.1.4 间接作用式调压器 indirect acting pressure regulator 利用出口压力变化，经指挥器放大后控制驱动器带动调节元件运动的调压器。 注：间接作用式调压器的作用原理示例见图2。 说明： 1——指挥器； 2——过程管； 3——驱动器； 4——信号管； 5——驱动腔； 6——阀座； 7——阀垫； 8——调压器壳体； 9——调节元件； 10——金属隔板； 11——驱动器壳体。 图2 间接作用式调压器示例 3.1.5 表前调压器 meter pressure regulator 安装于用户燃气表前，公称尺寸不大于DN25且最大进口压力不大于0.2 MPa的调压器。 3.1.6 内置监控单元 integrated monitor 当调压器出口压力超过工作调压器设定范围时，开始运行以维持调压器出口压力在允许范围值内的与工作调压器串联为一体的调压单元。 3.1.7 调压器公称尺寸 nominal diameter of pressure regulator 调压器进口的公称尺寸，表示调压器的尺寸规格。 3.1.8 公称压力 nominal pressure 一个用数字表示的与压力有关的标示代号，为圆整数。 注：本标准中用于表示调压器的进、出口法兰的公称压力。 3.1.9 设计压力 design pressure 在相应的设计温度下，用于确定壳体或其他零件强度的压力值。 3.1.10 进口压力范围 inlet pressure range 能保证调压器进口给定稳压精度等级的压力范围。 注：同一调压器可能具有不同的进口压力范围。 3.1.11 最大进口压力 maximum inlet pressure 在进口压力范围内，所允许的最高进口压力值。 3.1.12 最小进口压力 minimum inlet pressure 在进口压力范围内，所允许的最低进口压力值。 3.1.13 出口压力范围 outlet pressure range 能保证调压器出口给定稳压精度等级的压力范围。 注：同一调压器可能具有不同的出口压力范围，调压器可通过更换某些零部件来获得所需的出口压力范围。 3.1.14 最大出口压力 maximum outlet pressure 在出口压力范围内，所允许的最高出口压力值。 3.1.15 最小出口压力 minimum outlet pressure 在出口压力范围内，所允许的最低出口压力值。 3.1.16 基准状态 reference conditions 温度为15℃，绝对压力为101.325 kPa时的气体状态。 3.1.17 流量 volumetric flow rate 单位时间内流过调压器的基准状态下的气体容积。 注：单位为m3／h。 3.1.18 流量系数 flow coefficient 进口绝对压力0.243 MPa，温度为15℃，在临界状态下，调压器全开所通过的空气流量。 注：单位为m3／h。 3.1.19 静特性 performance 表述出口压力随进口压力和流量变化的关系。 3.1.20 静特性线 performance curve 在进口压力和调整状态不变时，通过先增加流量后降低流量得到的出口压力随流量变化的曲线。 注：本标准采用进口温度为15℃时的静特性线。 3.1.21 静特性线族 family of performance curves 同一调整状态下各不同进口压力下所得静特性线的集合。 3.1.22 实测设定压力 set point 调压器的一族静特性线的名义出口压力。 注：实测设定压力可等于额定出口压力。 3.1.23 压力回差 hysteresis band 一条静特性线上流量增大和流量减小时，同一流量值对应两个出口压力值之差。 3.1.24 驱动压力 motorization pressure 调压器驱动器高压腔内的气体压力。 3.1.25 静态 stable conditions 出口压力在干扰发生后逐渐平稳变化到稳定值后的状态。 3.1.26 稳压精度 accuracy 一族静特性线上，工作范围内出口压力实际值与实测设定压力间的最大正偏差和最大负偏差绝对值的平均值对实测设定压力的百分比。 3.1.27 稳压精度等级 accuracy class 稳压精度的最大允许值乘以100。 3.1.28 关闭压力 lock-up pressure 调压器调节元件处于关闭位置时，静特性线上零流量处的出口压力。 注：从开始关闭点流量减少至零流量所用的时间大于调压器关闭的响应时间。 3.1.29 关闭压力等级 lock-up pressure class 实际关闭压力与实测设定压力之差对实测设定压力之比的最大允许值乘以100。 3.1.30 最大精度流量 maximum accuracy flow rate 在规定的实测设定压力下，针对进口压力范围，能保证给定稳压精度等级的最大流量中的最小者。 3.1.31 最小精度流量 minimum accuracy flow rate 在规定的实测设定压力下，针对进口压力范围，能保证给定稳压精度等级的最小流量和静态工作的最小流量中的最大者。 3.1.32 关闭压力区 lock-up pressure zone 每一相应进口压力和实测设定压力的静特性线上，在零流量与最小流量间的区域(见图3中区域1)。 说明： p2——出口压力； p1——进口压力； AC——稳压精度等级； SG——关闭压力等级； Q——流量； Qmax，p1——p1下的最大流量； p2s——实测设定压力； Qmin，p1——p1下的最小流量； 1——关闭压力区SZ。 图3 关闭压力区(静态) 3.1.33 关闭压力区等级 class of lock—up pressure zone 最小流量和最大流量的比值的最大允许值乘以100。 3.1.34 静特性线族的关闭压力区等级 class of lock-up pressure zone of family of performance curves 静特性线族上，最小精度流量和最大精度流量的比值的最大允许值乘以100。 3.1.35 工作温度范围 operating temperature range 调压器组件及附加装置能正常工作的介质和本体温度范围。 3.1.36 控制元件 control member 安装在调压器流道中的可移动元件，用于控制调压器流道的开度。 3.1.37 失效关闭型调压器 fail close pressure regulator 主膜片失效或使控制元件运动的动力系统失效时，自动关闭或趋向关闭的调压器。 3.1.38 失效开启型调压器 fail open pressure regulator 主膜片失效或使控制元件运动的动力系统失效时，自动开启或趋向开启的调压器。 3.1.39 内置放散单元 integrated release device 安装在调压器本体上，当控制压力达到放散压力设定值时，以有限流量向大气中放散燃气的自力式放散单元。 3.1.40 内置切断单元 integrated shut-off device 安装在调压器本体上的自力式切断装置。 注：其特点为调压器正常工作时，内置切断单元处于开启状态、调压器出口压力达到切断压力设定值时依靠调压器出口的燃气压力自动切断燃气通路、燃气系统故障排除后执行机构由人工复位。 3.2 符号 表1中的符号适用于本文件。 表1 符号和说明 序号 符号 单位 说明 1 A ％ 稳压精度 2 Amin ％ 伸长率 3 AC — 稳压精度等级 4 AQ — 切断压力精度等级 5 Cg — 流量系数 6 Cgi — 测试工况下的流量系数 7 Cgx — 调压器在部分开度下的流量系数 8 DN — 公称尺寸标识前的字母符号 9 d — 试验介质的相对密度 10 K1j — 测试工况下的形状系数 11 K1 — 形状系数 12 m — 流量系数Cg试验中亚临界流动状态下的测试工况数 13 n — 流量系数Cg试验中临界流动状态下的测试工况数 14 p MPa 设计压力 15 p1 MPa 进口压力 16 p1av MPa 最大进口压力与最小进口压力的中间值 17 p1t Pa 第一测量时承压腔内试验介质的压力 18 p1max MPa 最大进口压力 19 p1min MPa 最小进口压力 20 p2 MPa 出口压力 21 p2c MPa 初设出口压力 22 p2t Pa 第二次测量时承压腔内试验介质的压力 23 p2int MPa p2min、p2max之间的初设出口压力 24 p2max MPa 出口压力范围内的最大出口压力 25 p2min MPa 出口压力范围内的最小出口压力 26 p2s MPa 实测设定压力 27 pa MPa或Pa 大气压力 28 pb MPa 关闭压力 29 pb1 MPa 关闭压力试验中第一次测量测得的关闭压力经温度修正后的压力 30 pb2 MPa 关闭压力试验中第二次测量测得的关闭压力经温度修正后的压力 31 pn Pa 基准压力 32 pta MPa 切断压力实际值 33 pts MPa 切断压力设定值 34 MPa 关闭压，力试验中第二次测量测得的关闭压力 35 pmax MPa 最大设计压力 36 Q m3/h 流量 37 Qi m3/h 一个承压腔的计算泄漏量 38 Qm m3/h 调压器进口温度为t1时试验测得的流量 39 Qmax m3/h 最大流量 40 Qmax，p1min m3/h 进口压力为p1min时的最大流量 41 Qmax，p1 m3/h 某一进口压力下的最大流量 42 Qmin m3/h 最小流量 43 Qmin，p1 m3/h 某一进口压力下的最小流量 44 Qmin，p1av m3/h 进口压力为p1av时的最小流量 45 Qmin，p1min m3/h 最小进口压力下的最小流量 46 Qmin，p1max m3/h 最大进口压力下的最小流量 47 QL m3/h 一条特性线的最大试验流量 48 QR m3/h 试验台能提供的最大流量 49 SG — 关闭压力等级 50 SZ — 关闭压力区等级 51 SZp2 — 静特性线族的关闭压力区等级 52 t h 保压时间 53 t1 ℃ 调压器前试验介质温度 54 t1t ℃ 第一次测量时承压腔内试验介质的温度 55 t2t ℃ 第二次测量时承压腔内试验介质的温度 56 tb1 ℃ 关闭压力试验中第一次测量测得的调压器出口温度 57 tb2 ℃ 关闭压力试验中第二次测量测得的调压器出口温度 58 V m3 承压腔体容积 59 △＋ MPa 出口压力实际值与设定值间正偏差 60 △－ MPa 出口压力实际值与设定值间负偏差 61 △p MPa 调压器尚能保证稳压精度等级的最小进出口压差 62 △t h 两次测量的间隔时间 63 △ph Pa 压力回差 64 △pt Pa 修正后的压力降 65 △pmax MPa 膜片所承受的最大压差 66 δ5 ％ 钢材的伸长率 67 δp1 MPa 进口压力范围 68 δp2 MPa 出口压力范围 4 分类与型号 4.1 分类 调压器的分类应符合表2的要求。 表2 调压器的分类 序号 分类方法 类别 1 工作原理 作用方式 直接作用式、间接作用式 失效状态 失效开启式、失效关闭式 2 连接形式 法兰、螺纹 3 最大进口压力/MPa 0.01、0.2、0.4、0.8、1.6、2.0、2.5、4.0、6.3、10.0 4.2 型号 4.2.1 型号编制 产品型号编制应符合下列要求： a) 调压器的型号编制按以下格式： 自定义号 连接型式代号 最大进口压力 调压器公称尺寸 工作原理代号 燃气调压器代号 b) 调压器的工作原理代号应符合表3的要求； 表3 调压器的工作原理代号 工作原理代号 工作原理 作用方式 失效状态 直接作用式 间接作用式 失效开启式 失效关闭式 Z1 √ — √ — Z2 √ — — √ J1 — √ √ — J2 — √ — √ ZB √ — √ — 注1：“√”表示适用，“—”表示不适用。 注2：ZB为表前调压器。 c) 调压器公称尺寸为进口连接的公称尺寸； d) 最大进口压力p1max，按0.01 MPa、0.2 MPa、0.4 MPa、0.8 MPa、1.6 MPa、2.5 MPa、4.0 MPa、6.3 MPa和10.0 MPa分9级选用，标出以MPa为单位的压力值； e) 连接型式，螺纹连接的代号为L，法兰连接时省略代号； f) 自定义号，包含调压器系列等制造商自定义编号。 4.2.2 示例 调压器型号示例如下： a) RTJ1-150／0.4 A，表示失效开启、公称尺寸为DN150、最大进口压力为0.4 MPa、法兰连接、自定义号为A的间接作用式调压器； b) RTZB-15／0.01 L，表示公称尺寸为DN15、最大进口压力为0.01 MPa、螺纹连接表前调压器。 5 结构和材料 5.1 一般要求 5.1.1 设计压力 5.1.1.1 金属承压件 金属承压件(包括正常工作时承受压力的金属零部件和膜片或差压密封件失效后承受压力的金属零部件)，其设计压力应符合下列要求： a) 当金属承压件承受进口压力p1时，其设计压力不应小于最大进口压力，且不小于0.4 MPa； b) 当金属承压件有安全保护装置保护时，若膜片或差压密封件失效后其承受的压力小于进口压力且不小于正常工作压力时，金属承压件的设计压力不应小于膜片或差压密封件失效后其承受的压力的1.1倍，或采用a)中规定的设计压力； c) 膜片或差压密封件失效后其承受的压力小于正常工作压力的金属承压件，设计压力不应小于最大正常工作压力的1.1倍，或采用a)中规定的设计压力。 5.1.1.2 金属隔板 金属隔板的设计压力不应小于高压侧最大压力与低压侧最小压力之差的1.1倍，但阀体内金属隔板的设计压力应符合5.1.1.1a)的要求。 5.1.1.3 膜片 膜片设计压力应符合下列要求： a) 当膜片承受的最大压差△pmax＜0.015 MPa时，膜片设计压力不应小于0.02 MPa； b) 当0.015 MPa≤△pmax＜0.5 MPa时，膜片设计压力不应小于1.33△pmax； c) 当△pmax≥0.5 MPa时，膜片设计压力不应小于1.1△pmax，且不应小于0.665 MPa。 5.1.2 工作温度范围 调压器工作温度范围应为－10℃～60℃或－20℃～60℃。 5.2 结构 5.2.1 进出口连接型式 5.2.1.1 调压器与上、下游管道的连接应符合下列要求： a) 法兰的连接尺寸及密封面型式应符合GB/T 9124.1、GB/T 9124.2、HG/T 20592或HG/T 20615的要求； b) 管螺纹应仅用于公称尺寸不大于DN50的调压器，并应符合GB/T 7306.1、GB/T 7306.2或GB/T 12716的要求。 5.2.1.2 法兰的公称压力不应小于调压器壳体的设计压力，并应在0.6 MPa、l.0 MPa、1.6 MPa、2.0 MPa、2.5 MPa、4.0 MPa、5.0 MPa、6.3 MPa、10.0 MPa、11.0 MPa系列值中选用。 5.2.1.3 调压器的进出口法兰公称压力应相同。 5.2.2 其他配置 5.2.2.1 间接作用式调压器的驱动压力应由调压器进口燃气提供。 5.2.2.2 调压器调压信号的取压位置及信号管的尺寸应能提供稳定的压力信号。 5.2.2.3 呼吸管或呼吸装置应有防止异物进入的措施。 5.2.2.4 内置切断单元、内置监控单元、内置放散单元等内置安全单元应与调压器的工作相互独立。 5.2.2.5 当内置安全单元为切断单元或监控单元时，间接作用式调压器的驱动力应由该安全装置下游提供。 5.2.2.6 调压器使用的电气附件应符合GB 50058的要求。 5.2.2.7 公称尺寸不小于DN200的调压器应设置吊装点。 5.2.2.8 调压器的法兰接头安装应符合GB/T 38343的要求。 5.2.3 表前调压器结构要求 5.2.3.1 表前调压器应有防止擅自调节设定状态的措施。 5.2.3.2 用于组装和固定调压器零部件的螺丝孔、轴钉孔等不应穿入燃气通道。孔与燃气通道之间的最小壁厚不应少于1 mm。 5.2.3.3 呼吸孔应防止被堵塞，其设置位置应防止膜片被从呼吸孔插入的尖锐物损伤。 5.2.4 公称尺寸和结构长度 5.2.4.1 调压器进口、出口连接公称尺寸的选用应符合GB/T 1047的要求。 5.2.4.2 进口、出口公称尺寸相同的法兰连接的调压器，其结构长度应采用表4或表5所示值。因结构特殊，允许按用户要求的其他尺寸。 表4 法兰连接的调压器结构长度 公称尺寸DN 法兰公称压力 结构长度公差mm PN6/10/16/20 Class 150 PN 25/40 Class 300 PN 63/100 Class 600 结构长度mm 表5 法兰连接的调压器备选结构长度 公称尺寸DN 法兰公称压力 结构长度公差mm PN6/10/16/25/40 Class 150/Class 300 PN63/100 Class 600 结构长度mm 5.2.4.3 内螺纹连接的调压器结构长度应符合表6的要求，因结构特殊，允许按用户要求的其他尺寸。 表6 内螺纹连接的调压器结构长度 公称尺寸DN 结构长度mm 结构长度公差mm 15 90 ＋1.0 －1.5 20 100 25 120 32 140 ＋1.0 －2.0 40 170 50 200 5.3 材料 5.3.1 一般要求 5.3.1.1 调压器零部件的材料对城镇燃气、加臭剂和燃气中允许的杂质应具有抗腐蚀的能力，还应考虑材料氢脆的影响。 5.3.1.2 调压器零部件的材料，应附有生产单位的质量证明文件。调压器制造单位应按质量证明文件对材料进行验收，必要时应进行复验。 5.3.1.3 调压器材料应符合国家现行有关标准。 5.3.2 金属材料 5.3.2.1 调压器零部件的金属材料应符合下列要求： a) 除紧固件及管接头外的承压件及金属隔板应根据使用条件，选用表7所列的材料； 表7 承压件材料的使用条件 材料 材料性质Amina ％ 使用条件 最大设计压力pmax MPa (p×DNb)max 最大公称尺寸 轧钢、锻钢 16 — — — 铸钢 15 — — — 球墨铸铁 7 2.0 150 — 15 2.0 500 — 可锻铸铁 6 2.0 100 100 铜锌锻造合金 15 — — 25 铜锡和铜锌铸造合金 5 2.0 100 100 15 — — 25 锻造铝合金 4 2.0 — 50 7 — — 50 铸造铝合金、压铸铝合金 1.5 1.0 25 150 4 2.0 160 — a 伸长率Amin应符合所选材料相关标准的要求。 b 调压器公称尺寸，对指挥器壳体是指其进口连接的公称尺寸。 b) 承压件的紧固件所用钢材的伸长率Amin不应小于9％； c) 管接头所用钢材的伸长率Amin不应小于8％。 5.3.2.2 最低工作温度低于－10℃但不低于－20℃，且调压器设计压力不小于2.5 MPa时，调压器阀体、阀盖、驱动器壳体和法兰盖等所用的金属材料，除应符合5.3.2.1的要求外还应符合下列要求： a) 碳钢、低合金钢应进行夏比V型缺口冲击试验，试验温度为－20℃，3个试样的平均冲击功不应小于27 J，允许一个试样的试验结果小于平均值，但不应小于20 J，冲击试验方法及要求应符合GB/T 229的要求； b) 奥氏体不锈钢不做冲击试验； c) 锻造及铸造铝合金的抗拉强度不高于350 MPa时，不做冲击试验。 5.3.2.3 承压件材料应符合下列要求： a) 钢制承压件材料应符合GB/T 12224、GB/T 12229的要求； b) 铁制承压件材料应符合GB/T 12227或GB/T 9440的要求； c) 铝制承压件材料应符合GB/T 15115、GB/T 1173或GB/T 32249的要求。 5.3.2.4 调压器承压件的材料为碳钢时，应选用优质碳素结构钢。用于焊接的碳钢、低合金钢的化学成分应符合下列要求： a) 碳的质量分数，当采用炉前分析时不应超过0.23％，当采用成品分析时不应超过0.25％； b) 硫的质量分数不应超过0.020％，磷的质量分数不应超过0.025％； c) 碳当量，当采用炉前分析时不应超过0.43％，当采用成品分析时不应超过0.45％。 注：碳当量(CE)计算公式为： CE＝wC(％)＋wMn/6(％)＋[wCr(％)＋wMo(％)＋wv(％)]/5＋[wNi(％)＋wCu(％)]/15。 5.3.2.5 钢制承压件无损检测应符合下列要求： a) 钢制承压件应按表8和表9的要求进行无损检测。 b) 无损检测应在材料热处理完成后或焊接热处理完成后进行，或选择在机加工前或后进行检验；表面无损检测应包括内外表面，但外螺纹、孔和内螺纹除外。 c) 抽检时，承压件不合格的，应从生产批次中再抽取两倍或以上的送检样品进行再次检验。如仍有不合格，检验范围应扩大到生产批次内的所有同类承压件。 d) 承压件返修应按相应工艺规程进行，并用同样的方法再次检验合格。 e) 无损检测技术等级应符合NB/T 47013的要求。 |
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