Some standard content:
ICS 27.060
J98
JB
Machinery Industry Standard of the People's Republic of China
JB/T6323--2002
replaces JB/T6323-1992||tt ||Attemperating and pressure reducing devices||Attemperating and pressure reducing devices released on 2002-07-16
Implemented on 2002-12-01
Foreword released by the National Economic and Trade Commission of the People's Republic of China||tt ||1
2
3
x
5
Scope
Normative references
Ordering requirements| |tt||Model
Performance requirements
5.1
General rules
5.2 Outlet steam flow 9.
Rated outlet steam temperature t2.||tt| |5.3
5.4
5.5
Rated outlet steam pressure P2.
Noise
Technical requirements,
6
6.1
6.2
General requirements
Materials
Welding and repair welding.
6.3
Inspection and acceptance
7
7.1
Material acceptance
7.2 Appearance inspection,
7.3 Non-destructive testing .
7.4 Mechanical property test.
Metallographic inspection…．
7.5
Hydraulic test
7.6
7.7
Type test
7.8 Quality record
8 Logo, paint and packaging
8.1 logo
8.2 paint.
8.3 packaging.
Appendix A (informative appendix) ordering requirements
Table 1 Various types of welds Non-destructive testing requirements and assessment standards Table A.1 Basic ordering requirements
item
times
JB/T 6323—2002
IB/T6323—2002||tt ||Foreword
This standard replaces JB/T6323-1992 "Technical Conditions for Temperature and Pressure Reduction Devices". Compared with JB/T6323-1992, the main changes in this standard are as follows: the name of the standard is changed to: "Temperature and pressure reduction device", which expands the pressure and temperature range of imported steam (Chapter 1 of the 1992 version and this version); Added ordering requirements (Chapter 3 of this edition); revised the minimum requirements and deviation range of rated outlet steam temperature (4.2 of the 1992 edition and 5.3 of this edition): revised the deviation range of the rated outlet steam pressure (1992 edition of 4.3 and 5.4 of this edition); modified the noise detection location and requirements of the device (4.4 of the 1992 edition and 5.5 of this edition); simplified the manufacturing technical requirements for the device (Chapter 5 of the 1992 edition and Chapter 6 of this edition) ): - Inspection and acceptance have been revised and supplemented (Chapter 6 of the 1992 edition and Chapter 7 of this edition). Appendix A of this standard is an informative appendix.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of the National Boiler Standardization Technical Committee (CSBTS/TC73). This standard was drafted by: Hangzhou Huahui Valve Co., Ltd. The main drafters of this standard: Chen Lilong, Zhang Ming, Chen Weiping. This standard was first published in 1992.
1
1 scope
Temperature and pressure reduction device
JB/T 6323—2002
This standard specifies the model of temperature and pressure reduction device Compile methods and requirements for performance, technology, inspection and acceptance, marking, painting and packaging, and provide guidance on ordering requirements. This standard applies to temperature and pressure reducing devices, desuperheating devices and pressure reducing devices (hereinafter referred to as "devices") whose working medium is steam. The parameters of imported steam are as follows:
- The working pressure is not greater than 26MPa and the working The temperature shall not be greater than 540℃; the working pressure shall not be greater than 6MPa and the working temperature shall not be greater than 570℃. 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. . For undated referenced documents, the latest edition applies to this standard. GB713--1997 Steel plates for boilers (neqISO5832-4:1996) GB/T912-1989 Carbon structural steel and low alloy structural steel hot-rolled thin steel plates and steel strips GB/T983--1995 Stainless steel welding rods (neqANSIVAWSA5.4:1992) GB3087 -1999 Seamless steel pipe for low and medium pressure boilers (neqISO9329-1:1989) GB/T3323-1987 Steel fusion welded butt joint radiography and quality classification GB/T3274-1988 Carbon structural steel and low alloy structural steel hot-rolled thick steel plate And steel strip (neFOCT14637:1979) GB/T5117--1995 carbon steel welding rod (eqvANSIVAWSA5.1:1991) GB/T5118-1995 low alloy steel welding rod (neqANSI/AWSA5.5:1981) GB5310--1995 high-pressure boiler without Slit steel pipe (negASTMA335:1990) GB/T9222--1988 Strength calculation of pressure components of water tube boilers GB/T10868 Technical conditions for power station desuperheating and pressure reducing valves GB/T10869 Technical conditions for power station regulating valves
GB/T14957-1994 Melting Steel wire for welding
JB/T1613-1993 Technical conditions for welding of boiler pressure components JB/T1614-1994 Test methods for mechanical properties of welded joints of boiler pressure components JB/T2636-1994·Metallographic and Fracture inspection method JB/T3375-2002 Incoming inspection rules for boiler materials JB/T3595 General requirements for power station valves JB4730-1994 Non-destructive testing of pressure vessels JB/T5263 Technical conditions for steel castings of power station valves JB/T9624 Technical conditions for power station safety valves ||tt ||JB/T9625-1999 Technical Conditions for Pressure-Containing Steel Castings of Boiler Pipe Accessories JB/T9626-1999 Technical Conditions for Boiler Forgings 3 Ordering Requirements
To facilitate user ordering, Table A.1 in Appendix A gives the supply information Please refer to the basic ordering requirements. JB/T 6323---2002
4 model
The device model is represented as follows:
0-0/0-0/0-00
WY［
Desuperheating water temperature value tb, unit is ℃
Desuperheating water pressure value pb, unit is MPa
Rated outlet steam temperature value 2, unit is ℃ Rated outlet steam pressure value p2: The unit is MPa inlet steam temperature value t, the unit is ℃
-The inlet steam pressure value P, the unit is MPa
The outlet steam flow value g, the unit is th
Temperature and pressure reduction The device code is represented by Chinese pinyin letters. Note 1: For the temperature reduction device and the pressure reducing device, the code names are represented by W and Y respectively. Note 2: The relevant pressure values ??in the model number are rounded to one decimal place. 5 Performance requirements
5.1 General
When the device operates under the working conditions of the design parameters and has been correctly installed and debugged on site, its outlet steam flow q, rated outlet steam temperature t2, rated outlet steam pressure p2, noise Level and other performance should respectively comply with and meet the requirements specified in 5.2 to 5.5 of this standard. 5.2 The outlet steam flow rate q
The outlet steam flow rate of the temperature reduction and pressure reduction device varies from 0.3q to 9. Special needs can be negotiated by both parties. 5.3 Rated outlet steam temperature t2
5.3.1 Rated outlet steam temperature must be above the saturation temperature (including saturation temperature). 5.3.2 The minimum deviation range of the rated outlet steam temperature is the rated outlet steam temperature t2 ± 5°C. 5.4 The deviation range of rated outlet steam pressure P2
is: a) When the rated outlet steam pressure is less than 0.98MPa, it is p2 ± 0.04MPa: b) When the rated outlet steam pressure is not greater than 3.82MPa , is p2 ± 0.06MPa) When the rated outlet steam pressure is greater than 3.82MPa, it is p2 ± 0.15MPa. 5.5 Noise
When the device is in normal operation, the overall noise level measured at a point 1m downstream of the same horizontal plane as the center line of the outlet of the temperature reducing and pressure reducing valve (pressure reducing valve) and 1m away from the pipe wall should not be greater than 85dB(A). If the buyer has special requirements, they can be resolved through negotiation between the buyer and the seller. 6 Technical Requirements
6.1—General Requirements
6.1.1 In addition to complying with the provisions of this chapter, the design and manufacture of the device shall also comply with the drawing requirements. 6.1.2 The control device matched with the device should be able to meet the normal operation of the device. 6.1.3 The temperature reducing and pressure reducing valve (pressure reducing valve) shall comply with the provisions of GB/T10868. 6.1.4 The regulating valve shall comply with the provisions of GB/T10869. 6.1.5 Safety valves should comply with the "Steam Boiler Safety Technical Supervision Regulations" and the regulations of JB/T9624. 6.1.6 Gate valves, stop valves, check valves, throttle valves and other valves should comply with the regulations of JB/T3595. 2
6.1.7 The strength of steam pipes, mixing pipes and pipe fittings in the device should be calculated in accordance with GB/T9222--1988. 6.2 Materials
6.2.1 Throttle orifice plates and rolled steel plates for steam pipes and mixing pipes shall comply with the regulations of GB713-1997. JB/T 6323--2002
6.2.2 The thin steel plates used for parts in steam pipes and mixing pipes should comply with the regulations of GB912-1989; the hot-rolled thick steel plates used should comply with the regulations of GB3274-1988.
6.2.3 Seamless steel pipes for steam pipes and mixing pipes shall comply with the provisions of GB3087-1999 when the medium parameters they bear are low and medium pressure; when the medium parameters they bear are high pressure, they shall comply with the provisions of GB5310-1995 Regulation. 6.2.4 Steel casting materials should comply with the regulations of JB/T5263 and JB/T9625-1999. 6.2.5 Forging materials should comply with the regulations of JB/T9626-1999. 6.2.6 Welding materials: Stainless steel electrodes should comply with the regulations of GB/T983-1995; carbon steel electrodes should comply with the regulations of GB/T5117-1995; low alloy steel electrodes should comply with the regulations of GB/T5118--1995; steel wires used for welding should comply with the regulations of GB/T5117-1995. Comply with the regulations of GB/T14957--1994. 6.2.7 Material substitution should meet the strength and structural requirements and must be approved by the design department of the product. 6.3 Welding and repair welding
6.3.1 The welding of pipes and pipe components (hereinafter referred to as pressure parts) of the device should be performed by personnel holding the corresponding category of "Boiler and Pressure Vessel Welder Certificate".
6.3.2 Welding and welding repair shall comply with the provisions of JB/T1613-1993. Before welding, the welding process evaluation shall be carried out in accordance with the "Steam Boiler Safety Technical Supervision Regulations". The visual inspection and non-destructive testing of welds shall be in accordance with the provisions of 7.2 and 7.3 of this standard. 6.3.3 When welds are repaired, visual inspection and non-destructive testing shall be carried out according to the quality requirements of the original welds. Repairs at the same position shall not exceed 3 times. Any repairs exceeding 2 times must be approved by the chief technical person in charge of the manufacturing unit. 6.3.4 Repair welding of steel castings shall comply with the provisions of JB/T3595. 7 Inspection and Acceptance
7.1 Material AcceptanceWww.bzxZ.net
The materials (including welding materials) used in the pressure parts of the device shall be subject to factory acceptance in accordance with JB/T3375-1991. 7.2 Appearance inspection
7.2.1 The outer dimensions of the welding seam shall comply with the requirements of the drawings and process documents. The height of the welding seam shall not be lower than the surface of the base metal, and the transition between the welding seam and the base metal shall be smooth. 7.2.2 The surface of the weld and its heat-affected zone should be free of cracks, lack of fusion, slag inclusions, arc craters and pores. 7.2.3 The longitudinal seams and circumferential seams of the main pressure-bearing parts of the device should have no undercut. The depth of the undercut of other welds should not be greater than 0.5mm. The total length of the undercut should not be greater than 20% of the weld length and not greater than 40mm. 7.2.4 The appearance quality of supporting valves should not only comply with the drawing requirements, but also comply with the provisions of JB/T3595. All types of valves (with or without actuators) supporting the device should undergo operability tests and inspections. They are required to operate flexibly, have light and smooth transmission, without any jamming, and have reliable actions of all parts of the travel switch and over-torque protection. precise. 7.3 Non-destructive testing
7.3.1 Non-destructive testing of various types of welds should be undertaken by personnel holding the "Boiler and Pressure Vessel Non-destructive Testing Personnel Qualification Certificate" of the corresponding type and technical level.
7.3.2 The non-destructive testing requirements and assessment standards for various types of welds are specified in Table 1. 7.3.3 For welds that are subject to radiographic and ultrasonic testing in proportion, if defects are found, additional testing should be carried out in the direction in which the defects extend. The proportion of supplementary testing should be 10% of the length of the weld. If there are still doubts after supplementary testing, 100% tested. 7.4 Mechanical property test
7.4.1 The requirements for mechanical property test of butt welds of main pressure parts shall comply with the provisions of JB/T1613-1993. 7.4.2 The method of testing the mechanical properties of butt welds of main pressure parts shall comply with the provisions of JB/T1614-1994. 7.5 Metallographic inspection
7.5.1 The requirements for metallographic inspection of welds shall comply with JB/T1613 1993 regulations. 3
JB/F 6323--2002
Weld category
Longitudinal welds of main pressure parts
Table 1 Non-destructive testing requirements and Assessment standard testing method and inspection quantity
100% radiographic testing of each weld,
plus at least 25% ultrasonic testing
diameter greater than 159mm or
main pressure parts | |tt | 450℃)
100% radiographic inspection of each weld or
ultrasonic inspection
at least 25% radiographic inspection or
ultrasonic inspection of each weld, also available Conduct random inspections based on no less than 25% of the total number of circumferential seams
Conduct random inspections based on magnetic particle testing on no less than 10% of the total number of connecting welds
7.5.2 Metallographic inspection of welds The method should comply with the provisions of JB/T2636-1994 7.6 Hydrostatic test
Evaluation standard
The weld quality
shall not be lower than Grade II.
Ultrasonic testing: JB4730—1994
The quality of the weld shall not be lower than level I.
Magnetic particle testing: JB4730-1994;
No cracks or vent holes are allowed,
Magnetic marks show no more than level I
7.6.1 The device is under pressure The hydraulic pressure test of the parts should be carried out after non-destructive testing and heat treatment. The test pressure is based on the rated outlet steam pressure p2 and the rated outlet steam temperature. The corresponding pressure-temperature grade table in JB/T3595 is 1.5 times the maximum allowable working pressure at 200°C. Ensure that The pressing time is at least 5 minutes, and there is no leakage or structural damage. After passing the hydraulic pressure test, the water should be drained, and anti-corrosion measures should be taken according to the material and structural characteristics. 7.6.2 The shell strength test of supporting valves requires no leakage or structural damage, and the test pressure and duration are in accordance with JB/T3595. 7.6.3 Safety valves with opening and closing sealing requirements must undergo a set pressure test and a sealing pressure test. The test specifications are in accordance with JB/T9624.
7.6.4 Temperature reducing pressure reducing valves (pressure reducing valves) and regulating valves that have leakage requirements can undergo sealing leakage tests according to the leakage levels specified in GB/T10868 and GB/T10869 respectively.
7.7 Type test
7.7.1 Type test items are in accordance with 5.2~5.5 of this standard. 7.7.2 In the two pressure series where the inlet steam pressure is less than 9.8MPa and greater than or equal to 9.8MPa, the design Devices with the same structure should undergo at least one type identification performance test at the device usage site, and meet the performance requirements specified in 5.2 to 5.5 of this standard (the flow rate should meet the design requirements).
7.7.3 The device type test shall be attended by a nationally recognized testing agency. 7.8 Quality records
The manufacturing unit shall conduct inspection and acceptance according to the drawings and the provisions of this standard, and fill in the main inspection items in the quality certificate. 8 Marking, Painting and Packaging
8.1 Marking
Devices that have passed the inspection shall have a nameplate mark bound at an obvious position on the steam pipeline. The nameplate mark at least includes the following content: model, design parameters, manufacturing unit name, product number, inspection worker number and manufacturing date. 8.2 Paint
8.2.1. Install steam pipes, pipes and other non-processed surfaces with anti-rust primer, and exposed processed surfaces with anti-rust and anti-corrosion grease (butter, industrial vinyl or neutral lubricating oil).
8.2.2 The color of the topcoat of the device shall be determined by the manufacturing unit or as required by the order. 8.3 Packaging
8.3.1 Precision electrical appliances, control instruments, supporting valves, etc. are packed individually or collectively in wooden boxes, and effective shockproof and moisture-proof measures are taken. 8.3.2 Packaging materials, size and quantity are determined by the manufacturing unit or ordering requirements. 8.3.3 The pipe ends and flanges in the device should be blocked with wooden or plastic covers. 4
8.3.4 Factory documents should include:
a) General drawing (including specifications, technical characteristics, inlet and outlet connection dimensions and support locations). Device technical parameters.
b)
Device quality certificate, including:
c)
1) Material grade, chemical composition, and mechanical performance report of the main pressure parts; 2) Mechanical property test report of product welding specimen; 3) Non-destructive testing report:
4) Hydrostatic test report;
5) Appearance and geometric dimension inspection report.
JB/T 6323---2002
Device certificate (including model, design parameters, manufacturing unit name, product number, inspection worker number and manufacturing date). d)
e)
Certificates for valves, control systems, etc.
Device instruction manual.
f)
5
JB/T 6323--2002
Device model
Device name
Outlet steam flow rate qh
Inlet steam pressure plMPa
Inlet steam temperature t℃
Rated outlet steam pressure p2MPa
Rated outlet steam temperature t2℃
Desuperheating water pressure ppMPa| |tt||Dehumidified water temperature ℃
Noise. dB(A)
Inlet piping size
Inlet piping material
Control method
Required documents
Necessary installation and debugging services||tt| | Others | | tt | . Appendix A
(informative appendix)
Ordering requirements
Table A.1
Basic ordering requirements
Change range
Change range
Change range
Deviation range
Deviation range
Change range
Change range
Device layout and structural form||tt| |Outlet piping size
Outlet piping material
Electric control
Flange:
Welding:
Pneumatic control port
Quantity (set )
horizontal port
reduced temperature water
pipe size
hydraulic control port
JB/T6323-2002 "Temperature and Pressure Reducing Device" Shikou
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