JB/T 3343-1993 Technical requirements for manufacturing high-pressure heaters
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T3343
·Addiction Absolute
1993-08-21
Ji Kui Ji
1993-10-01 Xiao Huang
Ji Kui Ji Lu Wa Yi Dao
1 Subject Content and Scope of Application
This standard specifies the manufacturing, inspection and acceptance of high-pressure heater products. JB/T33431993
JB334383
This standard applies to U-tube tube-sheet type and spiral tube header type high-pressure heaters with a water side design pressure of 13.7-35.0MPa and a design temperature not exceeding 350℃, a steam side design pressure not exceeding 10.0MPa, and a design temperature not exceeding 510℃ for thermal power generating units. This standard is also applicable to similar drain coolers and steam coolers. 2 Reference standards
GB3323
Steel pressure vessel
Steel shell and tube heat exchanger
Steel olefin-welded butt joint radiography and measurement analysis GB/T13306 Product label
JB1152
JR/T1610
JB/T 1613
JB1614
JB2536
JB3144
JB3375
JB3964
JB3965
ZB J04 005
ZB J98 015
3 Technical requirements
Technical conditions for pressure vessel parts
Ultrasonic testing of butt welds of boilers and steel pressure vesselsTechnical conditions for boiler nest manufacturing
Technical cases for welding of pressure-bearing components of boilers
Mechanical properties test methods for joints of pressure-bearing parts of boilersPainting, packaging and transportation of pressure vessels
Ultrasonic testing of fillet welds of large-diameter pipe sockets of boilersInspection of boiler raw materials at the factory
Qualification of welding procedure for pressure vessels
Steel pressure vessels Pressure Vessel Magnetic Particle Inspection
Penetration Inspection Method
Boiler Pipe Fittings Pressure Cast Steel Parts Technical Parts 3.1 The manufacture, inspection and acceptance of high-pressure heater products shall not only comply with the requirements of this standard and design drawings, but also comply with the relevant provisions of the Pressure Vessel Safety Technical Supervision Regulations issued by the Ministry of Labor. 3.2 The materials (including welding materials) used in the manufacture of high-pressure heater products shall have a material quality certificate (or its copy), and the inspection department of the manufacturing unit shall conduct reverse inspection in the factory according to the provisions of JB3375. Those that have not been inspected or have failed the inspection are not allowed to be produced. 3.2.1 The selection principles of high-pressure heater product materials, steel standards, heat treatment conditions and allowable stress values shall be selected in accordance with Chapter 2 "Materials" and Appendix A "Supplementary Provisions for Materials" in GB150. 3.2.2 If the materials for the manufacture of high-pressure heater products need to be substituted, the substitution procedures shall be handled in accordance with relevant regulations. 3.2.3 The steel plate used for the high-pressure heater shell shall be ultrasonically operated in accordance with the relevant provisions of the "Pressure Vessel Safety Technical Supervision Regulations". 3.2.4 The parts used for high-pressure heaters shall comply with the relevant provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels". 3.2.5 The steel castings used for high-pressure heating media shall comply with the relevant provisions of ZBJ98015. When the receiving components of high-pressure heaters are made of foreign materials, they shall meet the following requirements: 3.2. 6
1993-08-21
1993-10-01
JB/T33431993
a. Materials permitted for use in foreign pressure vessel specifications should be selected, and their scope of use should comply with the provisions of the corresponding specifications, and there should be a quality certificate for the material.
b. Before the first use by the manufacturing unit, relevant tests and verifications should be carried out, and only after the technical requirements are met can the materials be put into production. 3.3 For pipes that adopt the explosive jointing process, an air explosion test is required before the materials are put into production. The test method should be in accordance with the design and the provisions of the corresponding process. The sampling efficiency is 2/1000 of the total number of each batch number, and there are not less than 5 pipes. After the test, an appearance inspection should be carried out, and the surface should not have defects such as cracks. 3.4 Welders who weld high-pressure heater products must take the examination according to the boiler pressure vessel welder examination rules. After obtaining the worker qualification certificate, they can be engaged in welding work within the validity period. 3. 5 The welding process assessment of high-pressure heating vessels shall comply with the relevant provisions of JB 3-64. 3. The non-destructive testing personnel of high-pressure heating vessels shall be assessed in accordance with the qualification assessment rules for non-destructive testing personnel of steel furnace pressure vessels. Only those who have obtained the qualification certificate can undertake non-destructive testing work corresponding to the type and technical level of the qualified examination. 3. 7 The length of the cylindrical straight section of the water side head shall not be less than half of the nominal wall thickness of the head plus 25 mm, but not more than 50 mm. For spherical heads, no straight section is allowed.
3.8 The size allowable deviation of the water and steam side cylinders 3.8.1 The difference between the maximum diameter and the minimum diameter on the same section of the cylinder is e≤0.5%Dm. And, when Dm≤1200mm, its value is not more than 3mmlD≥1200mm, its value is not more than 7mm, 3. 8. 2 The allowable deviation of the straightness of the cylinder is L/1000 (L is the total length of the cylinder). And, when L≤6000mm, its value shall not exceed 4.5mmlL>6000mm, its value shall not exceed 8mm,
3. 9 The welding pipe hole on the water side cylinder shall not be opened on the weld key, and the distance between the center of the pipe hole and the edge of the weld key shall not be less than 0.8d (d is the diameter of the pipe hole), and not less than 0.5d + 12mm, 3. 10 After the water side head and cylinder are heat treated, the oxide scale on the inner and outer surfaces shall be removed, and the surface shall not have defects such as cracks and heavy skin. For defects such as bulges, depressions, target marks, etc. with a depth or height of 2~3mm, they shall be polished and smoothed. If the depth exceeds 3mm, they shall be repaired and polished before heat treatment.
3.11 Heat exchange tubes should not be spliced as much as possible. When splicing is necessary, it shall comply with the following provisions: 3. 11.1 The number of butt welds of U-shaped pipes shall not exceed 1, and there shall be no splice welds in the U-shaped general bend pipe section of at least 50mm straight pipe section. The shortest splice length shall not be less than 300mm: Spiral pipe splices shall not be arranged on the middle pipe. When the pipe length is 4-10m, 1 splice is allowed! When it is greater than 10m, there shall be no more than 2 splices. The shortest splice length shall not be less than 500mm. 3.11.2 The misalignment of the butt weld of the pipe shall not exceed 15% of the pipe wall thickness, and shall not exceed 0.5mm. The straightness deviation shall not affect the smooth threading.
3.11.3 The pipe shall be inspected by passing the ball at the root. When the nominal outer diameter of the pipe is D≤32mm, the passing ball diameter d≥0.75D. 3.11.4 Each butt joint shall be inspected by radiography, and the grade specified in GB3323 shall be qualified. 3.11.5 The heat exchange arm after docking shall be subjected to water pressure test with the test face pressure being twice the design pressure. 3.12 The ball diameter after heat exchange buttocks is in accordance with the provisions of Table 1. Table
Bending radius R
Ball diameter d
Note, D is the nominal outer diameter of the tube, D. is the nominal inner diameter of the tube 2. 5D, ≤R<3. 5DW
R≥3. 5D.
3.12.1 For heat exchange tubes that are not spliced, when the process is stable, for each high-pressure heater, 5% of the number of tubes with the minimum bending radius for each of the three ball diameters in the capsule 1, and at least 2 tubes are checked for ball inspection. 3. 12.2 When there is a joint at the bend of the carbon tube, when the nominal outer diameter D≤32 mm, the ball diameter d≥0. 7D3.13 The heat exchange tube should be checked for the reduction in thickness at the tube bend with the smallest bypass radius, and its value shall not exceed 17% of the nominal wall thickness of the original tube 2
JB/T3343
3. 14 After the pipe is bent and formed, each pipe (each coil) shall be subjected to a water pressure test. The test pressure is: 1.5 times the design pressure for U-shaped pipes and 2 times the design pressure for spiral pipes. The test time shall be at least 10 seconds under the test pressure. After each test, the water shall be drained and blown dry. 3.15 The manufacture of headers such as collecting pipes and distribution pipes shall be carried out in accordance with the relevant requirements of JB/T1610. 3.16 The holes on the collecting pipes and distribution pipes shall not be opened on the welds. 3.17
The fillet welds of the upper five-way and the main distribution pipe, the pipe ends and fillet weld grooves of the spiral pipes and the distribution pipes and collecting pipes shall be thoroughly cleaned of oil and rust, and can be welded only after being polished and cleaned. 3.18 The allowable tolerance of the true diameter of the U-shaped pipe and the tube hole on the tube plate shall comply with the provisions of Table 2. After drilling the tube sheet, the tube holes in the tube sheet center angle area of not less than 60\ shall be randomly checked. In this area, 4% of the tube holes are allowed to have an upper deviation of 0.15mm greater than the value in Table 2. 2
Tube outer diameter
Allowable deviation
Equal hole diameter
Allowable deviation
The deviation of the center distance between the two holes on the plate surface on the first drilling (entry drilling) side is ±0.The deviation of the center distance between any two 3mm tube holes is ±1 mm. 3.19
The hole width B between two adjacent tube holes on the tube sheet surface on the final drilling (drilling) side shall comply with the requirements of Table 3.3
U-shaped tube outer diameter
Tube hole maximum diameter
Bridge width
2419,40
3225, 40
16019
Allowable hole bridge width 3 (≥other bridge widths shall not be less than the following values) Plate
3.183.052.93
5.604.03:3.923.82
3.673.5713.31
3.153.072.98|2.90|2.8512. 774.60
4. 073.983. 903.8513. 773.553,433. 343.312. 91
6. 605. 325, 255. 195. 3
5.095. 034, 864, 774, 70
4.274.21/4.053.89
The smallest bridge width allowed (<4 bridges, not exceeding the number of bridges) is: The allowable bridge width B value in the table: For pipes with an outer diameter of less than 16 mm, the pipe bridge tolerance shall not exceed twice the station head tolerance plus 0, 508 mm. For tubes with an outer diameter greater than or equal to 16 mm, the tube tolerance is not more than twice the drilling displacement tolerance plus 0.762 mm. The hole offset tolerance = 0.0016 × 25.4 (tube sheet thickness at the tube diameter > mm). The maximum allowable value of the tube hole surface roughness parameter Ra on the tube sheet is 12.5 μm, and no longitudinal and spiral notches are allowed. 3.20
3.21 The allowable deviation of the hole diameter of the baffle plate and the support plate shall comply with the provisions of Table 4, and the number of holes with a maximum deviation of 0.1mm shall not exceed 4% of the total number of tube holes.
U-shaped tube outer diameter
bending plate and support plate
3.22If the hardness of the U-shaped tube end is greater than the hardness of the tube plate or the mechanical expansion tube is used, the hardness HB>170, the tube end should be annealed before expansion, and the annealing length shall not be less than the tube The plate thickness is plus 50mm. 3.23 Before passing through the pipe, the rust should be removed from the outer surface of the pipe with the thickness of the tube sheet plus 50mm until the metallic luster is displayed. 3.24 The length of the U-shaped pipe in the tube sheet: for the explosion-proof pipe, it should be not less than 0.6 times the thickness of the tube sheet, and for the mechanical expansion, it should be not less than 50mm. However, the expansion length shall not exceed the thickness of the tube sheet minus 3mm. 3.25 Before welding the pipe to the tube sheet, the surface of the tube sheet and the pipe end must be carefully scrubbed to remove impurities such as oil, rust and water vapor. The welding part and the site must be kept clean during welding. 3.26 When the sealing welding is done by manual welding, each weld should be welded more than twice. After each welding, the slag on the surface of the weld should be cleaned and the appearance should be inspected or colored with a magnifying glass. There shall be no defects such as cracks, pores, slag inclusions, and unfused surfaces on the weld and heat-affected zone. The minimum diameter of the pipe after welding shall not be less than 80%Dn.
3.27 The surface of the tube plate cladding layer shall be subjected to ultrasonic flaw detection or magnetic particle flaw detection inspection according to the provisions of JB3965~B5 after mechanical processing. The surface shall be free of cracks, slag inclusions, incomplete penetration, pores and other defects. The surface shall not be larger than 2 equivalent diameters. When the thickness of the cladding layer is not less than 8mm, it shall not be larger than 3 equivalent diameters. 3.28 After each high-pressure heater is expanded, it shall be checked for leakage. If there is leakage, it must be supplemented. The expansion operation shall comply with relevant safety regulations. 3.29 When the spiral pipe or the joint is corner welded to the channel box, the groove must be opened on the general end or the header. Before assembly, the rust on the surface of the pipe end and around the pipe hole of the header must be removed until the metallic luster is revealed. When connecting, the objects in contact with it Must be clean. After completion, the weld surface should be cleaned and inspected for appearance: each weld and heat-affected zone surface should not have cracks, pores, slag inclusions, unfused defects, etc. 3.30 After the spiral pipe is assembled, the two adjacent coils and the coils and partitions should not touch each other. The spiral pipe and the cylinder should maintain a distance of at least 10mm1m. 3.31. When the high-pressure heater head, cylinder and temporary plate are butt-jointed, the misalignment and cutting amount of the joints should comply with the relevant provisions of GB150. 3.32 The head, cylinder and replacement plate of the high-pressure heater should be heat treated after welding in accordance with the relevant provisions of GB150: the water side inlet and outlet water joints and manhole seats should also be heat treated after welding.
4 Inspection and acceptance
4.1 The surface shape, size and appearance requirements of the high-pressure heater weld should comply with the following relevant provisions: The overall dimensions of the weld key shall comply with the requirements of the design drawings and technical documents. The height of the weld shall not be lower than the surface of the parent material, and the weld and the parent material shall have a circular transition;
b. The weld surface shall not have defects such as cracks, pores, arc pits and slag inclusions, and no slag and flying objects shall be left. The undercut depth of the weld surface shall not be less than 0.5mm, the continuous length of the undercut shall not be greater than 100mm, and the total length of the undercut on both sides of the weld key shall not exceed 10% of the weld length.
4.2 When the air drying test of the pipes using the explosive expansion process fails, a double-doubled sample shall be taken from the corresponding batch number pipes for repeated testing. If the retest still fails, the pipes of this batch number shall not be used for the explosive expansion process. 4.3 The non-destructive testing of high-pressure heat exchanger products shall meet the following requirements: 4.3.1 Shot blasting of the weld 4.3.2 Ultrasonic testing of coal seams shall be carried out in accordance with the relevant provisions of JB1152, and the results of the inspection shall be qualified at level 1, and the results of local flaw detection shall be qualified at level 2. 4.3.3 Radiographic flaw detection shall be used for the terminal ring weld on the cylinder of high-pressure heater. When the cylinder wall thickness is greater than 3mm or it is not possible to use radiographic flaw detection due to structural reasons, ultrasonic flaw detection may be used. 4.3.+ The ultrasonic flaw detection of the fillet welds of the inlet and outlet pipes of the water chamber shall comply with the relevant provisions of JB3114, and the surface magnetic particle and penetrant inspection shall comply with the relevant provisions of GB150, and the magnetic particle flaw detection shall be qualified at level 1. 1 The welding test plate of each high-pressure heater shall comply with the relevant provisions of the safety technical supervision regulations for pressure vessels. 4.5 The joints between the open tube and the tube sheet, the spiral tube and the distribution pipe, and the mixer pipe shall be subjected to welding process assessment before welding. The method and requirements shall comply with the relevant provisions of the appendix of GB151. 3.6 The pre-weld test specimens of the connection joints between the tube and the tube sheet or the header shall be made according to the following requirements: 4.6.1 Each welder of each high-pressure heater shall make two test specimens and make cross-sectional inspection. 4
JB/T33431993
4.6.2 Macroscopic inspection of the joint (using a magnifying glass of about 10 times), the qualified standards are as follows: For the sealed welded joint, there shall be no cracks, the weld key thickness (minimum leakage diameter) shall not be less than two-thirds of the tube wall thickness, and the diameter of a single pore shall not be greater than 0.25 times the tube wall thickness.
For spiral tubes and nest boxes, there should be no defects such as cracks and penetrating pores. The diameter of a single pore should not exceed 0.25 times the thickness of the tube wall. The straight side length of the triangle that is not filled with molten metal on the fillet weld between the end of the tube and the bottom of the header slope II should not exceed 1.5mm (see figure)
4. Look. 3. Visual inspection of joints. The qualified standards are as follows: There shall be no cracks or overburnt structures in the weld metal and heat-affected zone. There shall be no unfused structure between the parent metal and the weld metal and between the layers of weld metal. In non-martensitic steel, there shall be no hardened martensitic structure in the weld metal and heat-affected zone. The looseness of the weld metal mesh shall not exceed 10% of the pipe wall thickness.
4.6.4 When the quality of commercial pressure heater products is stable for a long time, the pre-weld test of the connection joint may be reduced or exempted after approval by the factory-level technical investor. 4.7 Requirements for weld repair
4.7.1 The repair of welds shall be performed by welders who have passed the special test, and the repair process measures shall be approved by the welding technical person in charge. The repair times of the same part shall not exceed two times. If the welded joints that have failed the second retest need to be repaired, they must be approved by the factory technical person in charge, and the number of repairs, locations and non-destructive testing results should be recorded in the high-pressure heater quality certificate. 4.7.2 Welds that require heat treatment in high-pressure heater products should be repaired before heat treatment. If they are repaired after heat treatment, they should be heat treated again after repair.
4.8 After the high-pressure heater is manufactured, the connection joints between the U-tube and the tube sheet, the water and steam sides, the assembled cylinder and the piping system must be pressure tested separately, and the test items and requirements should be indicated on the drawings. 4.8.1 Pressure test
4.8.1.1 During the hydraulic test, the ambient air temperature should be higher than 5°C, otherwise anti-icing measures should be taken. If there is no drawing requirement, the liquid temperature is generally not less than 5°C. Other alloy steels should not be lower than 15°C. 4.8.1.2 The test pressure should comply with the following provisions: Formula:
Pt-1. 25P
Where: Pr-design pressure, MPat
[a]-material allowable stress at test temperature, MPa[Material allowable stress at design temperature, MPaTat
When the ratio is greater than 1.8, take 1.8.
Screw pipe-header type: After the high-pressure boiler body and the pipe system are assembled, hydraulic tests should be carried out separately. The test pressure of the pipe system is 1.5 times the design pressure; the test pressure of the body should be 1.25PMPa. 4.8.1.3 During the decompression test, the pressure should be raised and lowered slowly. When the pressure rises to the design positive pressure, the pressure should be stopped and a preliminary inspection should be carried out. If there is no leakage or abnormality, then the pressure should be raised to the test pressure and maintained at the test pressure for 13-30 minutes, and then reduced to the design pressure for a careful inspection, and the pressure should be maintained for at least 30 minutes. If there is leakage, it should be repaired and retested. 4.8.2 Sealing test of pipe and tube sheet joints 4.8.2.1 Before the sealing test, the longitudinal and circumferential welds of the inflatable part of the steam side cylinder should be inspected by full weld chain radiography or ultrasonic flaw detection. The height of the inflatable part of the vertical high-pressure heater should not be less than 100mm. 4.2.2 The pressure and method of the sealing test should comply with the technical requirements in the sample or the relevant process regulations. 4.8.3 There should be no loose rust and impurities on the external surface of the high-pressure heater, and its interior must be cleaned thoroughly without impurities. 4.9 Product nameplate
4.9.1 The product nameplate of the high-pressure heater shall be fixed in an obvious position. High-pressure heaters without product nameplates shall not leave the factory. The product nameplate shall at least include the following contents: 4.9.2
Name or code of the manufacturer!
Manufacturing license number:
Name of high-pressure heater:
Model of high-pressure heater,
Product number of high-pressure heater,
Category:
Design pressure (tube, shell)
Design overflow (tube, process)
Test pressure (tube, process)!
Heating area:
Quantity,
Manufacturing date,
The nameplate specifications on high-pressure heater products should be selected in accordance with the provisions of GB/T13306. 4.10 The factory documents of high-pressure heater products shall include at least the following parts: 4. 10. 1
Product certificate:
Product manual:
Product quality certificate:
Chemical composition and mechanical properties of materials of main components, metallographic inspection results of main forgings, and no detection results of components!
Hydraulic test and sealing test results +
Main inspection results of welding quality (including repair records of more than two times): d.
Heat treatment of main components
Items that do not conform to this standard and the national group (such as temporary peak modification of the main structure), others (material substitution of main components, number of blocked pipes, etc.). g.
General drawing of slope engineering:
4.11 Anticorrosion and anticorrosion methods of high-pressure heaters 4.11.1 The hydraulic test can be carried out by passivation reduction. After the test, it is completely discharged and then the gas phase anticorrosive agent or inflation is used. 4.11.2 Water or molten salt can be used for liquid repellency test. After the test, it should be completely drained and then filled with anti-explosion agent or nitrogen. 4.12 The oil filling, packaging, transportation, etc. of high-voltage heaters shall comply with the provisions of 1B2536. 6
JB/T3343
Additional instructions,
This standard was proposed and approved by Shanghai Power Equipment Complete Design Institute of the Ministry of Machinery Industry. This standard was developed by Shanghai Power Equipment Complete Design Institute of the Ministry of Machinery Industry. The main drafter of this standard is Xue Zhinian. bzxz.net
From the date of implementation of this standard, JB3343--B3 High-pressure heater manufacturing technical conditions>Work degree heron
JB/T3343
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