HG/T 2119-1991 Specification for three-tube internals of ammonia synthesis tower
Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2119～2120--91
Technical Conditions for Internals of Ammonia Synthesis Tower
Published on August 19, 1991
Ministry of Chemical Industry of the People's Republic of China
Implemented on January 1, 1992
HG/T2119-91 Technical Conditions for Three-Tube Internals of Ammonia Synthesis Tower HG/T2120--91 Technical Conditions for Single-Tube Parallel Flow Internals of Ammonia Synthesis Tower| |tt||Chemical Industry Standard of the People's Republic of China
Technical Conditions for Three-Tube Internals of Ammonia Synthesis Tower 1 Subject Content and Scope of Application
1.1 This standard specifies the manufacturing, inspection and acceptance requirements for three-tube internals of ammonia synthesis tower. HG/T2119-91
20010322
1.2 This standard applies to DN600mm, DN800mm and DN900mm with a design pressure not exceeding 1.8MPa and a design temperature not exceeding 550C. DN1000mm ammonia synthesis tower internals (hereinafter referred to as internals), 2 reference standards
Steel pressure vessels
Steel shell and tube heat exchangers
GB1234 High resistance electric heating alloys
GB1800~1804 Tolerances and fits
GB2270
Stainless steel seamless steel pipes
GB3003
GB3323
JB2536
JB47 08
3 Technical requirements
Ordinary aluminum silicate refractory fiber felt
Radiography and quality classification of steel fusion welding butt joints Pressure vessel painting, packaging, transportation
Welding process assessment
Steel pressure vessel
Alkali-free glass fiber cloth
Asbestos cloth
3.1.1 The main material should be 0Cr18Ni11Ti, 0Cr19Ni9:1Cr18Ni9Ti can be used as a substitute material.
3.1.2 The material should comply with the relevant standards and relevant technical requirements, and should have a quality certificate from the material manufacturer. The certificate should at least include the following: manufacturer name, steel grade, furnace (bump) number, batch number, measured chemical composition and mechanical properties, and heat treatment status of the delivery. The manufacturer can conduct re-inspection. 31.3 Welding materials should comply with the relevant standards. They can only be used after acceptance. 3.1.4 The outer diameter and wall thickness limit deviation of the heat exchanger tube of the heat exchanger shall comply with the high-precision of GB2270. 3.1.5 The electric furnace wire material shall comply with the provisions of GB1234. 3.1.6 The surface of the amber mica board is not allowed to have cracks or delamination. 3.1.7 The alumina insulator of the electric heater is required to have an aluminum oxide (A1,O) content of not less than 95%, and a high-voltage withstand test shall be performed. The test method and acceptance requirements shall be in accordance with the provisions of 4.4.1. 3.1.8 Asbestos cloth, alkali-free glass fiber cloth and ordinary aluminum silicate refractory fiber felt shall comply with the provisions of JC210, JC170 and GB3003 respectively.
3.2 Manufacturing
Approved by the Ministry of Chemical Industry of the People's Republic of China on August 19, 1991 and implemented on January 1, 1992
3.2.1 Welding
HG/T2119-91
3.2.1.1 The welding of internal parts shall be performed by welders who have passed the welding test for similar materials. 3.2.1.2 The process qualification of internal welding shall be in accordance with the provisions of JB4708 and Appendix C of GB151. The requirements for weld repair and welder marking shall be in accordance with the provisions of GB150.
3.2.2 When hot working stainless steel parts, long-term heating above 600°C shall be avoided as much as possible, otherwise solid solution treatment shall be carried out. 3.2.3 The limit deviation of the un-toleranced dimensions of machined parts shall comply with the provisions of GB1804: IT14 for machined surfaces and IT16 for non-machined surfaces.
3.2.4 Coal catalyst basket
The limit deviation, roundness and straightness tolerances of the catalyst basket body diameter shall comply with the provisions of Table 1. 3.2.4.1
Tower nominal diameter
DNI000
Diameter limit deviation
Straightness
shall not exceed
1/1000 of the cylinder length, and
within the full length range
no more than 4
Length limit deviation
conforms to
IT14 level in GB1800~1804, and
within the full length range
±5
3.2.4.2The center tube should be made of a whole seamless steel tube, and its straightness within any 2m length range shall not exceed 1mm, and the total straightness shall not exceed 3mm. When two tubes are spliced, the short tube length shall not be less than 500mm, and the weld structure shall adopt the insertion type. 3.2.4.3The pipes and partitions of the gas distribution box shall be carefully cleaned before assembly and welding, and the internal cleanliness must be ensured during the assembly process. 3.2.4.4 The inner and outer cooling pipes and thermocouple sleeves must be straightened before assembly. The straightness tolerance is not greater than 1mm within any 2m range, and the straightness of the total length is not greater than 3mm.
3.2.4.5 The inner and outer cooling pipes should be made of a whole seamless steel pipe. When two pipes are spliced, the short pipe length should not be less than 500mm. 3.2.4.6 Thermocouple sleeves should be made of a whole seamless steel pipe. When two pipes are spliced, the short pipe length should not be less than 2m. 3.2.5 Heat exchanger
3.2.5.1 The diameter limit deviation, roundness and straightness tolerance of the heat exchanger cylinder shall comply with the provisions of Table 2. The diameter limit deviation
roundness tolerance
straightness tolerance
in Table 2 shall not exceed 1/1000 of the cylinder length
3.2.5.2 Heat exchange tubes shall be piped with whole seamless steel pipes and shall not be spliced. Each tube shall be visually inspected and straightened. 3.2.5.3
The diameter and deviation of the tube holes on the tube sheet and baffle shall comply with the provisions of Table 3. Table 3
Pipe outer diameter
Hole diameter
Limit deviation
Baffle
Hole diameter
Limit deviation
Adjacent holes of baffle
Hole center distance
Limit deviation
The requirements for pipe bridge after drilling holes in the tube sheet shall comply with the requirements in Table 4. Tube outer diameter
Distance between center of hole
Maximum back hole
HG/T2119-91
Nominal hole bridge
Allowable hole bridge width B (96% of the hole bridge
width must be equal to or greater than the following value)
Tube sheet thickness
Tube extension length: 1.0~1.5mm for manual arc welding, 3.2.5.4 Tube and tube sheet are connected by welding, mm
Minimum hole bridge
For argon arc welding, it is
0.5~1.0mm. After the tube and tube sheet are welded, the parallelism tolerance of the two tube sheets shall not exceed 2mm, 3.5.5 The gas distribution boxes of the upper and lower heat exchangers of the ammonia synthesis tower of the auxiliary steam must be thoroughly cleaned before welding, and no iron filings, hair, dirt and rust shall be present.
3.6 Electric heater
3.2.6.1 The electric furnace wire should be manufactured in one piece. 3.2.6.2 The electric furnace wire should be straightened and not twisted. 3.2.7 Thermocouple tube
3.2.7.1 Thermocouple tube must be straightened before assembly. Its straightness is not greater than 1mm within the range of any 2m length, and the straightness tolerance of the total length is not greater than 2mm
3.2.7.2 Thermocouple tubes are allowed to be spliced, and the shortest splicing length shall not be less than 2m. 3.2.8 Insulation layer
3.2.8.1 Asbestos cloth should be baked and dried before wrapping. 3.2.8.2 The insulation material should be wrapped densely, with uniform thickness, and the outer diameter of the insulation sleeve shall not exceed the size specified in Sample 1. 3.2.8.3 The insulation layer is wrapped after the water low test. It must not be damp during the wrapping process, otherwise it should be dried again. 3.3 The straightness tolerance of the internal parts assembled as a whole shall not exceed 1/1000 of the total length and shall not exceed 6mm. The limit deviation of the total length is:
DN1000 tower, ±12mm;
DN800 tower, ±10mm;
DN600 tower, ±8mm
Test methods and inspection rules
4.1 Acceptance of all parts and finished products a. Inspection of material quality certification documents;
b.-Appearance inspection (including appearance inspection of welds); c.
Dimensional inspection.
4.2 Catalyst basket
4.2.1 The straightness tolerance of the cylinder is checked by the intersection of the horizontal and vertical planes of the cylinder axis with the cylinder, that is, by pulling a 0.5mm thin steel wire at four positions of 0°90°, 180°, and 270° along the circumference. The distance between the measuring position and the longitudinal weld should not be less than 100mm.
4.2.2 All welds should be visually inspected, and the length of each butt weld of the cylinder should not be less than 20% of the length of the radiographic flaw detection inspection.For the inner and outer surfaces of the welds of DN800mm and DN1000mm catalyst basket cylinders, and the outer surface of the welds of DN600mm cylinders, 100% color inspection shall be carried out, and then a water pressure test shall be carried out.
HG/T2119-
4.2.3 For the welds of the catalyst basket cylinder, one welding test plate shall be made for each unit, and the made test specimens shall meet the following requirements: a.
2 tensile test specimens:
b. 2 bending test specimens;
c. 2 metallographic test specimens of the welded joint (1 each for low-power magnification structure and microstructure). 4.2.4 The butt welds of the external cooling tube, thermocouple tube and thermocouple sleeve shall be subjected to 100% radiographic inspection and color inspection. All spliced pipes shall be inspected by a ball with a diameter of 0.9 times the inner diameter of the pipe, and a water pressure test shall be carried out on each pipe. Test pressure: a.
External cooling pipe and thermocouple sleeve are 2 of the design pressure, maintained for 5min; b.Thermocouple tube is: 1.25P
Note: P.-
-MPa, maintained for 5min.
Design pressure of the shell of the ammonia synthesis tower, MPa; (5)——Permissible stress of the material at the test temperature, MPa; ()——Permissible stress of the material at the design temperature, MPa.4.2.5 The butt weld of the central tube shall be inspected by 100% radiographic inspection and be able to pass through the porous plate smoothly.4.2.6 The catalyst basket body shall be subjected to water test at 1.25P
MPa, and the pressure shall be maintained for 30min.
4.2.7 The welds of the gas box shall be 100% inspected by coloring. 4.2.8 After the upper cover plate and the external cooling tube of the gas box are welded, a water pressure test shall be carried out at a pressure of 1.25P[8]
MPa and the pressure shall be maintained for 30 minutes. After all the gas boxes are welded, a penetration test shall be carried out with 0.1MPa of compressed air containing ammonia (1% to 3% by volume). 4.3 Heat exchanger
4.3.1 The heat exchange tubes shall be subjected to a water pressure test one by one. The test pressure shall be twice the design pressure and the pressure shall be maintained for 5 seconds. 4.3.2 After the heat exchanger is welded, a water pressure test shall be carried out at a pressure of 1.25P[8]
MPa and the pressure shall be maintained for 30 minutes. The upper and lower heat exchangers of the internal parts of the byproduct steam ammonia synthesis tower should be subjected to water pressure test respectively. 4.4 Electric heater
4.4.1 In each batch of sintered finished products of alumina insulators, 10% (not less than 2 pieces) of each type are selected as heat-resistant samples. The test is to send the sample to the heating furnace, heat it to 1400℃ at a rate of 200℃ per hour, keep it warm for 1h, take it out and cool it at room temperature, and then send it to the furnace for heating again. After heating and cooling three times, if there is no crack on the surface, the batch of finished products is considered qualified. When the temperature is 1000C, the withstand voltage should be 1000V.
4.4.2 The electric heater should be inspected after assembly, and the insulation resistance should be greater than 2MQ. At the same time, corresponding records should be made. 4.5 The chloride ion content of the water used for the water pressure test shall not exceed 25ppm. 4.6 All parts that have passed the water test should be blown dry with compressed air on the inner and outer surfaces. 4.7 Radiographic inspection shall be carried out according to the provisions of GB3323, and level II is qualified. Color inspection shall be in accordance with the provisions of Appendix H of GB150. S
Technical documents
Items);
Factory certificate;
Quality certificate (chemical composition of materials of "main parts", non-destructive testing of mechanical properties, welding quality, permanent pressure test, etc. Product instructions (installation instructions, operating instructions and product completion drawings). 1) The main parts include gas distribution box, center tube, catalyst basket body, flat cover, clamping ring, cold arm, thermocouple tube, thermocouple sleeve, heat exchanger body, tube sheet, tube, cone, electric heater standard Marking, packaging, transportation, storage
HG/T2119
6.1 Marking
After the catalyst basket and heat exchanger are packaged, the manufacturer shall determine the center of gravity and make markings. 6.2 Packaging and transportation
6.2.1 The internal parts of the ammonia synthesis tower shall not be painted. Protective measures shall be taken on the threads and joint surfaces, and anti-rust grease shall be applied to the spherical surface of the support tubes at both ends of the heat exchanger.
6.2.2 The catalyst basket, heat exchanger, electric heater and thermocouple of the ammonia synthesis tower internal parts shall be separately When the internal parts are packed and shipped as a whole, measures should be taken to prevent deformation and damage of the parts. 6.2.3 The delivery list and technical documents should be delivered together with the equipment. The delivery list should include the name of the manufacturer, product number, etc. 6.2.4 When packaging the upper and lower heat exchangers of the by-product steam ammonia synthesis tower internals, the heat exchangers and the bottom extension pipes should be firmly wrapped. 6.2.5 The internal parts and cylinder of the catalyst basket should be fixed with wooden supports. 6.2.6 Other technical requirements should comply with the relevant provisions of JB2536. 6.3 Storage
When the internal parts are stored in the open air, measures should be taken to prevent rain, moisture and sunlight. Additional remarks:
This standard was proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the Chemical Industry Ministry's Chemical Machinery Equipment Standardization Technical Unit (Chemical Industry Ministry's Chemical Machinery Research Institute). This standard was drafted by Nanjing Chemical Industry Corporation Chemical Machinery Factory. The drafter of this standard is Luo Hongjuan.
This standard is entrusted to the Chemical Industry Ministry's Chemical Machinery Equipment Standardization Technical Unit for the interpretation.1 The internal parts of the ammonia synthesis tower shall not be painted. Protection measures shall be taken for the threads and joint surfaces, and anti-rust grease shall be applied to the spherical surface of the support tubes at both ends of the heat exchanger.
6.2.2 The catalyst basket, heat exchanger, electric heater and thermocouple of the internal parts of the ammonia synthesis tower should be packed separately before leaving the factory. When the internal parts are packed as a whole before leaving the factory, measures should be taken to prevent deformation and damage of the parts. 6.2.3 The delivery list and technical documents shall be delivered together with the equipment. The delivery list shall include the name of the manufacturer, product number, etc. 6.2.4 When packaging the upper and lower heat exchangers of the internal parts of the by-product steam ammonia synthesis tower, the heat exchanger and the bottom protruding pipe shall be wrapped firmly. 6.2.5 The internal parts and the cylinder of the catalyst basket shall be fixed with wooden supports. 6.2.6 Other technical requirements shall comply with the relevant provisions of JB2536. 6.3 Storage
When the internal parts are stored in the open air, measures shall be taken to prevent rain, moisture and sun. Additional Notes:
This standard was proposed by China National Chemical Equipment Corporation. This standard is managed by the Chemical Machinery and Equipment Standardization Technical Unit of the Ministry of Chemical Industry (Chemical Machinery Research Institute of the Ministry of Chemical Industry). This standard was drafted by the Chemical Machinery Factory of Nanjing Chemical Industry Corporation. The drafter of this standard is Luo Hongjuan.
This standard is entrusted to the Chemical Machinery and Equipment Standardization Technical Unit of the Ministry of Chemical Industry for interpretation.1 The internal parts of the ammonia synthesis tower shall not be painted. Protection measures shall be taken for the threads and joint surfaces, and anti-rust grease shall be applied to the spherical surface of the support tubes at both ends of the heat exchanger.
6.2.2 The catalyst basket, heat exchanger, electric heater and thermocouple of the internal parts of the ammonia synthesis tower should be packed separately before leaving the factory. When the internal parts are packed as a whole before leaving the factory, measures should be taken to prevent deformation and damage of the parts. 6.2.3 The delivery list and technical documents shall be delivered together with the equipment. The delivery list shall include the name of the manufacturer, product number, etc. 6.2.4 When packaging the upper and lower heat exchangers of the internal parts of the by-product steam ammonia synthesis tower, the heat exchanger and the bottom protruding pipe shall be wrapped firmly. 6.2.5 The internal parts and the cylinder of the catalyst basket shall be fixed with wooden supports. 6.2.6 Other technical requirements shall comply with the relevant provisions of JB2536. 6.3 Storage wwW.bzxz.Net
When the internal parts are stored in the open air, measures shall be taken to prevent rain, moisture and sun. Additional Notes:
This standard was proposed by China National Chemical Equipment Corporation. This standard is managed by the Chemical Machinery and Equipment Standardization Technical Unit of the Ministry of Chemical Industry (Chemical Machinery Research Institute of the Ministry of Chemical Industry). This standard was drafted by the Chemical Machinery Factory of Nanjing Chemical Industry Corporation. The drafter of this standard is Luo Hongjuan.
This standard is entrusted to the Chemical Machinery and Equipment Standardization Technical Unit of the Ministry of Chemical Industry for interpretation.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.