HG/T 2267-1992 General Technical Requirements for Soda Ash Cast Iron Towers HG/T2267-1992 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2267-92
General Technical Conditions for Cast Iron Soda Ash Towers
Published on January 8, 1992
Ministry of Chemical Industry of the People's Republic of China
Implementation on July 1, 1992
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General Technical Conditions for Cast Iron Soda Ash Towers
1 Subject content and scope of application
1.1 This standard specifies the general technical conditions for the manufacture, inspection and acceptance of cast iron soda ash towers. HG/T2267-92
1.2 This standard applies to atmospheric pressure cast iron towers such as carbonization towers, distillation towers, condensation towers, absorption towers, decalcification towers, etc. for the production of soda ash, and does not apply to cast iron towers in the category of pressure vessels.
2 Reference standards
Packaging, storage and transportation pictorial symbols
Chemical analysis methods for steel and alloys
Technical conditions for high-quality carbon structural steel
Carbon structural steel
Methods for testing mechanical properties of grey cast iron parts
Stainless steel bars
GB1220
GB1804
GB3281
GB3620
GB4879
Tolerances and fitsLimit deviations of dimensions without tolerancesTechnical conditions for thick plates of stainless acid-resistant and heat-resistant steelsTitanium and titanium alloy grades and chemical compositions
Rust-proof packaging
Cast iron Name, definition and code of heat treatment state of parts GB5614
GB6060.1'Surface roughness comparison sample Casting surface GB6060.2 Surface roughness comparison sample Grinding, turning, boring, milling, inserting and planing surface Casting size tolerance
GB6414
GB9439 Grey cast iron parts
JB2753 Nickel-based cast iron welding rod
HG5--1585 Technical conditions for packaging of chemical machinery parts 3 Technical requirements
General provisions
3.1.1 In addition to complying with this standard, the manufacture, inspection and acceptance of cast iron towers shall also comply with the requirements of design drawings and relevant technical documents. 3.1.2 The overall installation of cast iron towers shall be carried out by the purchaser at the site of use, and the installation technical requirements shall be in accordance with Appendix A (Supplement) 3.2 Materials
3.2.1 Grey cast iron parts shall comply with the provisions of GB9439. Carbon structural steel materials should comply with the requirements of GB699 and GB700. 3.2.2 Stone
3.2.3 Stainless steel materials shall comply with the provisions of GB3281 and GB1220, titanium and titanium alloy materials shall comply with the provisions of GB3620, 3.2.4
Special materials such as alloy cast iron shall comply with the chemical composition and mechanical properties specified in the design drawings, 3.2.5
Ministry of Chemical Industry of the People's Republic of China approved the standard mbz608o.00m on January 8, 1992 and implemented on July 1, 1992
HG/T2267--92
3.3 Casting quality
3.3.1 The inner and outer surfaces of the castings shall be flat, and the sand and burrs shall be cleaned up. Harmful defects on the castings such as sand holes, pores, scars, etc. shall be polished and smooth after repair,
3.3.2 The casting surface roughness Ra value shall not exceed 100um. 3.3.3 Casting size deviation and shape position tolerance 3.3.3.1 The inner diameter size limit deviation of the tower base, tower ring and cooling box shall comply with the provisions of Table 1, Table 1
Inner diameter size
Limit deviation
1000~1250
>1250~1600
>1600~2000
>2000~2500
>2500~3150
The wall thickness size limit deviation of the tube sheet shall comply with the provisions of Table 2. Tower base, tower ring, cooling box, tower cover.
Wall thickness size
Limit deviation
>32~40
>3150~4000
>40~63
3.3.3.3 The limit deviation of flange thickness (non-machined surface) of tower base, tower ring, tower cover, tube sheet, etc. shall comply with the provisions of Table 3. Table 3
Flange thickness size
Limit deviation
Inner diameter size
Roundness tolerance| |tt||The roundness tolerance of the inner diameter of the tower ring shall comply with the provisions of Table 4. Table 4
1000~1250
>1250~1600
>1600~2000
>40~63
>2000~2500
>63~100
>2500~3150
>3150~4000
3.3.3.5 The position deviation of two adjacent pipe nozzles on the tower ring and cooling box shall not exceed 0.4°, and the limit deviation of the axial size of the pipe nozzle position shall comply with the provisions of Table 5.
Pipe nozzle position sizebZxz.net
Limit deviation
109~160
>160~250
>250~400
>400~630
3.3.3.6 The center distance between two adjacent casting grooves of the casting groove flange on the cast iron tower parts is extremely The limit deviation is ±1.5mm, and the limit deviation of the casting groove width is ±2.0mm
3.3.3.7 When the individual outer ribs of the cooling box and the tower base are connected by bolts, they can be processed and trimmed. The thickness of the trimmed ribs shall not be less than 1/2 of the rib thickness specified in the standard drawing.
HG/T2267-92
3.3.3.8 The limit deviation of the thickness of the tube sheet partition rib is mmm. The limit deviation of the dislocation of the partition rib is ±3mm, 3.3.3.9 The dimensional tolerances of the accessories not specified in this standard and design drawings shall comply with the requirements of GB6414CT13. 3.3.4 Casting defects and treatment
3.3.4.1 For defects such as sand holes, pores, shrinkage cavities, sand inclusions, etc. on castings, if the single area is not larger than 30mm×30mm and there are no more than 5 defects on each casting, they shall be treated separately according to the depth of the defects. The defective parts are only allowed to be welded once. After welding, the castings shall be immediately subjected to artificial aging treatment according to GB5614.
8. When the depth of the defect is not larger than 1/3 of the wall thickness, it is allowed to use cast iron welding rod Z248 to repair the defect under the condition that the casting is preheated to 400～450℃. It is also allowed to use TZNi-8 or TZNiFe-8 welding rods specified in JB2753 to repair the defective parts. Only one welding is allowed.
b. When the depth of the defect is greater than 1/3 of the wall thickness but not greater than 1/2 of the wall thickness, it is allowed to use cast iron welding rods of the same material as the casting for gas welding repair. It is also allowed to use cast iron welding rod 248 to repair by electric welding when the casting is preheated to 500~600C. 3.3.4.2 The following minor defects on the casting do not need to be repaired. 8. Porosity, sand holes and other defects on the non-machined surface are allowed to exist when the area is not greater than 8mm×8mm, the depth does not exceed 4mm, the adjacent distance is greater than 100mm, and there are no more than 8 defects on each casting. b. Minor defects with a diameter and depth of no more than 3mm on the flange machining surface are allowed to exist when the adjacent distance is greater than 30mm and there are no more than 5 defects.
3.3.4.3 Tooth loss defects on cast iron tower parts are allowed to be repaired by electric welding. 3.3.4.4 The inner surface of the tube hole of the tube sheet is not allowed to have longitudinal scratches and through hole defects that affect the sealing. When the defect depth is no more than 1/2 of the tube bridge width, it shall be handled according to the following provisions.
a. Defects with a diameter of no more than 3mm on the inner surface of the tube hole are allowed to be repaired when the number is no more than 1. b. If there are scattered defects on the inner surface of the tube hole, when the diameter is not more than 10mm and the number is not more than 3, lead repair is allowed, but the number of repaired tube holes on each tube sheet shall not exceed 10. 3.3.4.5 The body of each component of the cast iron tower is not allowed to have crack defects that affect the strength. However, when crack defects appear in the partition ribs of the cooling box and the tube sheet and the external reinforcement ribs of the cooling box and the tower base, they can be repaired. a. When the crack length of the partition ribs of the cooling box and the tube sheet is not more than 35mm, and there are no more than two cracks on each casting, it is allowed to use TZNiFe-8 or TZNi-8 welding rods for electric welding repair. b. When the crack length of the external reinforcement ribs of the cooling box and the tower base is greater than 30mm, and there are no more than 1 crack between two adjacent ribs, and no more than 5 cracks on each casting, it is allowed to use TZNi-8 or TZNiFe-8 welding rods for electric welding repair. 3.3.4.6 Cleaning and welding operations before welding defective parts of castings. Before welding, the defective parts should be cleaned and welding can be carried out only after inspection and confirmation that the cleaning is qualified. a.
b. Welding operations must be carried out according to the welding repair process that has been qualified in the process assessment. Welding operations should be performed by welders who have passed the examination for welding cast iron materials. c
3.3.5 Castings should be subjected to artificial aging treatment or natural aging treatment before machining. The aging treatment should comply with the provisions of GB5614.
34 Machining
3.4.1 The upper and lower flange surface distance limit deviation of the tower ring and cooling box is ±1.0mm; the upper and lower flange surfaces should be perpendicular to the main body axis, with a verticality tolerance of 0.5mm; the upper and lower flange surfaces should be parallel to each other, with a parallelism tolerance of 0.5mm. 3.4.2 The rectangular flange surfaces on both sides of the cooling box body should be parallel to the main body axis, with a parallelism tolerance of 0.5mm; the two flange surfaces should be parallel to each other, with a parallelism tolerance of 0.5mm.
3.4.3 The flange surface connecting the tube sheet and the cooling box shall be perpendicular to the axis of the tube sheet, with a verticality tolerance of 0.5mm. The axis of the tube hole on the tube sheet shall be perpendicular to the flange surface, with a verticality tolerance of 0.5mm. 3.4.4 The limit deviation of the center distance between any two adjacent tube holes on the tube sheet is ±0.7mm, the cumulative limit deviation of each horizontal row of holes is 2.0mm, and the cumulative limit deviation of each 3
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vertical rows of holes is 1.0mm.
HG/T2267—92
3.4.5 The position tolerance of the center of the upper and lower flange bolt holes of the tower ring, cooling box, etc. is 2.5mm. 3.4.6 The inner flange surface on the tower ring shall be parallel to the upper and lower flange surfaces, with a parallelism tolerance of 0.5mm. 34.7 The dimensional tolerance of the distance between the weir mouth of the tower ring with overflow weir and the tower ring flange surface shall comply with the provisions of GB6414CT11 level. 34.8 After the overflow weir of the upper water tank is processed, each weir mouth shall be parallel to the processed surface of the tank bottom, and the parallelism tolerance is 1.0mm. 3.4.9 The processing dimensional tolerance not specified shall be in accordance with the provisions of GB1804IT14 level. 3.5 The parts shall be subjected to water pressure test before pre-assembly. After the parts of the cast iron tower are processed, the water pressure test shall be carried out according to the test pressure required by the design drawings. The pressure shall be maintained for 15 minutes without leakage.
3.6 Preassembly
3.6.1 After all parts have been inspected and qualified, pre-assembly shall be carried out from bottom to top according to the requirements of the general drawing. Each pre-assembly shall be carried out for no less than three sections of tower rings. The top section of the previous pre-assembly shall be used as the bottom section of the next pre-assembly. The main parts such as tube sheets, side covers, tees, elbows, straight pipes, etc. are pre-assembled at the same time according to the positions required by the general drawing. 3.6.2 When the cast iron tower is pre-assembled, the coaxiality tolerance of two adjacent tower rings shall not exceed 3.0mm, and the actual deviation directions of three adjacent tower rings shall not be the same.
During pre-assembly, check the dimensions of each part and the orientation of the pipe mouth according to the general drawing. After the pre-assembly is qualified, the tower sections with the same position as the general drawing are marked with paint. 3.6.3
4 Test methods
4.1 Mechanical properties test of cast iron materials
4.1.1 The tensile test shall be carried out in accordance with GB977, and at least one tensile test shall be carried out for each batch. 4.1.2 The preparation of test bars and specimens, as well as the evaluation and re-inspection of test results shall be in accordance with GB9439. 4.2 Chemical composition analysis
When the cast iron tower is made of alloy cast iron, the chemical composition analysis shall be carried out in accordance with GB223, and once for each batch. 4.3 Water pressure test
4.3.1 The water pressure test must use two pressure gauges with the same range and calibrated accuracy not less than 2.5. The range of the pressure gauge should be twice the test pressure, but should not be less than 1.5 times or higher than 4 times the test pressure.4.3.2 The water temperature should not be lower than 5℃.
4.3.3 During the test, an exhaust port should be set at the top, and the air in the equipment should be exhausted when water is injected.4.3.4 During the test, the pressure should rise slowly, and the pressure should be maintained for no less than 15 minutes after reaching the specified test pressure. Check that there is no leakage in each part.
4.4 Air tightness test
After the cast iron tower is installed properly, the test shall be carried out according to the requirements of A5 in Appendix A (Supplement).5 Inspection rules
5.1 Delimitation of inspection batches for mechanical properties and chemical composition5.1.1 Generally, castings cast from the same package of molten iron are considered as one batch. 5.1.2 When a large amount of molten iron of the same grade is melted continuously, the castings poured within 2 hours can be made into a batch. 5.1.3 The tower diagram, cooling box and other castings weighing more than 2000k should be a separate batch. 5.2 The geometric shape and size of the cast iron tower parts should be checked piece by piece, and the measuring instruments used should comply with the relevant standards. 5.3 The casting surface roughness should comply with GB6060.1, and the machining surface roughness should comply with GB6060.2. 5.4 Casting defects are generally self-checked.
5.5 Purchased parts should have a quality certificate.
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6 Marking, packaging, purchase and transportation and factory documents
Product nameplate of cast iron tower
Manufacturer name;
Product name;
Trademark;
Product model or mark;
Date of manufacture.
HG/T2267~-92
The main parts of cast iron tower, tower bottom, tower ring, cooling box should be cast with the manufacturer's name and manufacturing year and month
The processing surface of each part should be rust-proofed according to the requirements of GB4879, and the packaging of each part should be carried out according to the provisions of HG5-1585. The storage and transportation graphic signs should be selected according to the provisions of GB191. The storage and transportation of cast iron tower parts should be rainproof and moisture-proof. Place flat. Documents that cast iron tower should be provided when leaving the factory
Product certificate;
Product quality certificate;
Packing list;
Other relevant technical documents
6.8'Product quality certificate
Casting mechanical properties test report;
Alloy casting chemical composition analysis report;
Hydraulic pressure test inspection report:
Pre-assembly inspection report:
Repair report for casting defects with a depth exceeding 1/3 of the wall thickness; Relevant items specified in the order contract.
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HG/T2267—92
Appendix A
Technical requirements for overall installation of cast iron towers
(Supplement)
A1 The overall installation of cast iron towers is carried out on siteA2 The foundation of the cast iron tower shall be constructed according to the design drawings approved by the prescribed proceduresA3 The overall installation shall be carried out in accordance with the relevant provisions such as the "Technical Regulations for Installation" and "Technical Operation Regulations for Safety in Installation" approved by the prescribed procedures.
A4 The main technical indicators of the cast iron tower after installation shall meet the following requirements:A4.1 The flange on the tower base must be parallel to the base, and the parallelism tolerance is 0.05mmA4.2 The coaxiality tolerance of the two adjacent tower rings above the tower base shall not be greater than 3.0mm, and the actual deviation directions of the three adjacent tower rings shall not be the same. A4.3 After overall installation, the coaxiality tolerance of the tower cap and the tower base shall not exceed 20.0mmA4.4 The tower body shall be vertical after overall assembly, and the verticality tolerance shall be 1/1000 of the tower height, and the maximum shall not exceed 15.0mm. A4.5 After the tower body is installed, the total height dimension limit deviation shall be ±30.0mmA4.6 When each circle of tower sections is installed, the vertical distance between the gas meat and the root of the cap teeth shall be uniform and equal in height, with a height dimension limit deviation of ±3.0mm, and the vertical distance dimension limit deviation between the root of each circle of the cap teeth and the overflow outlet weir plate shall be ±3.0mm, A5 pressure test
After the cast iron tower is installed and qualified, a water pressure test or air tightness test shall be carried out according to the process and technical characteristics of various towers. After meeting the requirements, the pressure shall be released and the bolt tightening shall be rechecked, and secondary tightening shall be carried out. A6 Anti-corrosion
After the cast iron tower is installed and the pressure test is qualified, the interior shall be cleaned and the dirt on the outer surface of the tower body shall be removed. According to the process and technical characteristics of various towers, paint shall be applied for anti-corrosion treatment.
Additional Notes:
This standard is proposed by China Chemical Equipment Corporation, Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the chemical machinery and equipment standardization technical centralized unit of the Ministry of Chemical Industry. This standard was drafted by Jinxi Chemical Machinery Factory, and Sanmenxia Chemical Machinery Factory and Sichuan Chemical Machinery Factory participated in the drafting. The main drafters of this standard are Gao Xiyuan, Zhang Zhongkong, Dang Lin, Jing Yinzhong, Qiu Xuejun, and He Hailou. This standard is entrusted to the Ministry of Chemical Industry for the interpretation of the technical centralized unit for standardization of chemical machinery and equipment. The standard industry data is free to download
People's Republic of China
Chemical Industry Standard
General Technical Conditions for Soda Ash Cast Iron Tower
HG/T2267-92
Editor: Chemical Industry Standards Reduction Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013
Printing: Standardization Research Institute of the Ministry of Chemical Industry
Copyright reserved. No reproduction is allowed
5 sheets. Number of words: 12000
Format: 880×12301/16
First edition in June 1993
First printing period in June 1993
Number of copies: 1-300
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