Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2422-93
Steam Heating Furnace for Light Soda Ash
Published on March 11, 1993
Ministry of Chemical Industry of the People's Republic of China
Implemented on October 1, 1993
Chemical Industry Standard of the People's Republic of China
Steam Heating Furnace for Light Soda Ash
1 Subject Content and Scope of Application
HG/T2422-93
This standard specifies the type and basic parameters, design requirements, manufacturing, assembly and installation, test methods, inspection rules and marking, packaging, transportation and storage requirements of steam heating furnace for light soda ash production (hereinafter referred to as furnace) for pure industrial calcination of heavy alkali. This standard is applicable to the design, manufacture, inspection and acceptance of various specifications of calcination furnaces with an inner diameter of 1.8~3.6m. When the inner diameter of the calcination furnace exceeds the above range, it can also be used as a reference. 2 Reference standards
Steel pressure vessels
GB1184
GB1300
GB1720
GB1804
Steel shell and tube heat exchangers
Dangerous goods packaging markings
Pictorial markings for packaging, storage and transportation
Priority numbers and priority number systems
Carbon structural steel
Carbon cable steel and low alloy steel plates for boiler manufacturing Ordinary carbon structural steel cold-rolled steel strips
Shape and position tolerances Provisions for tolerances not specified Steel wire for welding
Determination of paint film adhesion
Tolerances and fits Limit deviations of dimensions without tolerances GB3077
GB3087
GB3181
GB33 23
GB5117
GB5118
GB5293
GB6404
GB6654
GB7233
GB8163
GB9443
GB9444
Technical conditions for alloy structural steel
Seamless steel pipes for low and medium pressure boilers
Standard samples for paint film color
Radiography and quality grading of steel fusion welding butt jointsCarbon steel welding rods
Low alloy steel welding rods
Flux for submerged arc welding of carbon cable steel
Determination method of sound power level of noise of gear deviceUltrasonic flaw detection and quality grading method of carbon steel and low alloy steel thick steel plate castings for pressure vesselsSeamless steel for conveying fluids Steel pipe
Method for rating of flaws revealed by penetrant testing of steel castingsMagnetic particle testing and quality rating of steel castingsGB10095
GB11368
Precision of involute cylindrical gears
Cleanliness of gear transmission devices
Approved by the Ministry of Chemical Industry of the People's Republic of China on 1993-03-11 and implemented on 1993-10-01
Product label
JB1152
JB2536
JB2759
JB2880
JB3963
JB3965
JB4708
HG/T2422-93
Ultrasonic welding of butt welds of boilers and steel pressure vessels Flaw detection for pressure vessels, painting, packaging and transportation
General technical conditions for packaging of electromechanical products
Technical conditions for welded steel atmospheric pressure vessels
Ultrasonic flaw detection of pressure vessel forgings
Magnetic particle flaw detection of steel pressure vessels
Welding procedure assessment for steel pressure vessels
ZBG93010
ZBJ19004
ZBJ19005
ZBJ74003
High frequency resistance welded spiral finned tubes
Cylindrical gear reducer
Loading test method for cylindrical gear reducer
Ultrasonic flaw detection of steel plates for pressure vessels
3 Types and basic parameters
According to the alkali return supply method, it can be divided into two types: external alkali return and self-alkali return. 3.1
3.2Example of model specification:
Production capacity (t/d)
Inner diameter of furnace body (m)
External return alkali type
Satin firing furnace
Light soda ash
Production capacity (t/d)
Inner diameter of furnace body (m)
Self-return alkali type
Transporting firing furnace
-Light soda ash
3.3Basic parameters shall comply with the provisions of Table 1
Inner diameter of furnace body, m
Production capacity, t/d
Furnace body length, m
Furnace speed
Main drive, r/min
Auxiliary drive, r/min
Furnace body inclination, %
Note: Specifications in brackets are not recommended. 2
Select according to the priority number system of GB321
Control the linear speed of the furnace inner wall to be less than 1.1m/s
4 Design requirements
HG/T2422-93
4.1 Materials
4.1.1 The furnace body shall comply with the provisions of Q235-A in GB700.4.1.2 The base tube of the warp tube shall comply with the provisions of No. 20 seamless steel tube in GB3087 or GB8163, and the fin shall comply with the provisions of Q235-A cold-rolled steel strip in GB716.
4.1.3 The pinion shall comply with the provisions of 42CrMo in GB3077 (No. 45 steel forgings are allowed. After heat treatment and machining, the tooth surface hardness and precision grade shall not be lower than the specified values of 42CrMo steel forgings). The necessary test scope of forgings shall be in accordance with the provisions of Table 2 and Table 2
Forging group
Inspection characteristics
Determination of the hardness of each forging
Basic symbols of the group
Conditions for forming a batch
Necessary for acceptance of forgings of the same steel grade that undergo heat treatment together
Mechanical property indicators
Test methods
Each forging is tested
4.1.4 The large ring gear ZG35CrMo shall comply with the provisions of Table 3 (ZG45 is allowed. After heat treatment and machining, the tooth surface hardness and accuracy grade shall not be lower than the specified values of ZG35CrMo). The steel castings are subjected to aging treatment. 100% ultrasonic flaw detection is carried out on steel castings in accordance with GB7233, with grade 3 as qualified. Table 3
ZG35CrMo
ZG35CrMo
0.30~0.40
Heat treatment type
0.50~0.80
0.80~1.10
0.20~0.30
302~341
4.1.5 Rollers, supporting wheels, retaining wheels and supporting wheel shafts shall comply with the provisions of 35CrMo and 42CrMo in GB3077. The necessary test scope of forgings shall be in accordance with the provisions of Table 2.
4.1.6 Steam chamber steel plates shall comply with the provisions of 20g, 16Mng in GB713 or 20R, 16MnR in GB6654. 20g, 20R steel plates with a thickness greater than 38mm and 16Mng, 16MnR steel plates with a thickness greater than 30mm shall be used in normalized state and ultrasonic flaw detection shall be carried out on each plate in accordance with ZBJ74003. Grade III is qualified. 4.1.7 Welding rods, welding wires and fluxes for automatic submerged arc welding shall comply with the standards of GB5117, GB5118 and GB5293.
GB1300,
4.2 Design principles
4.2.1 Process conditionsbzxz.net
Pressure: 2.8~3.5MPa
HG/T2422-93
Temperature: saturated steam temperature + superheat (superheat <50℃)℃b.
Heavy alkali moisture: ≤20%
Ignition furnace outlet temperature: 105℃
| Soda outlet temperature of the transport furnace: 180~210℃
Technical indicators
Carbon dioxide concentration in furnace gas: >85% (dry basis, volume %) b.
Steam consumption: converted to the working conditions of 18% water content of heavy alkali and 3.0MPa saturated steam pressure, the steam consumption per ton of soda ash is less than 1400kg
c, continuous operation time: under the specified process conditions and a load of not less than 80% of the production capacity, the continuous operation time of the transport furnace is not less than 2.2×10h,
4.2.3 Assessment rules
. Production capacity: refers to the average daily output obtained from the continuous 72-hour production assessment. Output calculation method: output minus finished product quantity + various losses from the export of the transport furnace to the packaging of the finished product, b. Carbon dioxide concentration in furnace gas: data obtained by sampling and analysis under the negative pressure operation conditions of 0~98Pa.C. Steam consumption: refers to the average amount of steam consumed per unit output in the continuous 72-hour production assessment. And converted to the steam consumption per ton of soda ash under the conditions of 18% water content of heavy alkali and 3.0MPa saturated steam pressure. 4.2.4 Mechanical equipment
4.2.4.1 The equipment shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the national prescribed procedures. 4.2.4.2 The fins and base tubes of the finned tubes are welded by high-frequency resistance welding. 4.2.4.3 The large gear ring is arranged near the fixed end roller. 4.2.4.4 The main transmission and auxiliary transmission devices should make the pinion drive the large gear ring to rotate upward. 4.2.4.5 The self-return alkali sintering furnace is equipped with a material taking ring, and its position and size should meet the process design requirements. 4.2.4.6 The number, helix angle, rotation direction and cross-sectional size of the alkali sintering tube of the self-return alkali sintering furnace should meet the process design requirements. 4.2.4.7 The pinion and large gear ring are designed according to the medium hard tooth surface. 4.2.4.8 The position of the free end support wheel should take into account the thermal expansion of the furnace body. In the cold and hot states, the two end faces of the free end roller ring shall not be located outside the two end faces of the support wheel.
4.2.4.9 The structural type of the stopper wheel should adopt a mechanical signal stopper wheel. 4.2.4.10 The contact surface between the pinion and the large gear ring is lubricated with thin oil. The contact surface between the roller ring and the support wheel and the stopper wheel is lubricated with thin oil or graphite.
The pinion and the large gear ring are equipped with dust covers, and the roller, supporting wheel and retaining wheel are equipped with safety dust covers and have ventilation conditions. 4.2.4.11
4.2.4.12 The connection between the rotary joint and the outside shall not be hard-connected, but shall use corrugated short pipes or other compensation devices. The supporting wheel and retaining wheel bearings shall use rolling bearings, and the design calculated life shall not be less than 8×10h. 4.2.4.13
4.2.4.14 The design, manufacture, inspection and acceptance of the steam chamber shall comply with the provisions of the "Regulations on Safety Technical Supervision of Pressure Vessels" issued by the Ministry of Labor of the People's Republic of China.
4.2.4.15 The welding joint type between the steam chamber water barrier and the steam chamber tube sheet and flat plate adopts full penetration weld. 4.2.4.16 The connection type between the heating tube and the steam chamber tube sheet adopts strength expansion plus sealing welding or strength welding plus expansion, and complies with the provisions of GB151.
4.2.4.17 The rotating joint adopts graphite ring mechanical seal type or flexible graphite filler type. The life of graphite ring should not be less than 8×10°h, and the replacement cycle of flexible graphite packing should not be less than 4:3×10*h. 4.2.4.18 The sealing device of furnace head and furnace tail adopts cylinder compression type end face seal. 4.2.4.19 Requirements for main reducer
HG/T2422--93
Should comply with the provisions of ZBJ19004 and other standards
The manufacturing accuracy of transmission gear should not be lower than 8-7-7 level specified in GB10095. b.
Noise should not be greater than 85dB (A).
The cleanliness of the inner cavity should not be lower than D level specified in GB11368. d.
The number of stress cycles of high-speed gears should not be less than 5×107e
4.2.4.20 When calculating the thickness of the insulation layer, the outer surface temperature of the insulation layer is taken as 50℃. 4.2.4.21 The design life of the glow furnace is generally not less than 15 years. 4.2.5 Electric control
4.2.5.1 The continuous power supply to the motor should be guaranteed. If the power is cut off due to an accident, the power supply must be restored within 15 minutes. 4.2.5.2 The electrical control circuits of the main motor and the auxiliary motor are interlocked to ensure that the main motor cannot be started when the clutch of the auxiliary motor is not removed.
4.2.5.3 The main motor with a variable frequency speed control device should consider setting a bypass starting circuit. 4.2.6 Instrumentation and Control
4.2.6.1 The instrument power supply shall adopt an uninterrupted power supply device, and the instrument compressed air pressure shall be maintained within the range required by the instrumentation and control equipment. 4.2.6.2 Automatic adjustment shall be adopted to keep the steam pressure entering the furnace and the flash steam pressure within the design range. 4.2.6.3 Automatic adjustment shall be adopted to keep the pressure in the furnace under negative pressure of 0~98Pa. 4.2.6.4 Automatic adjustment shall be adopted to keep the liquid level of the condensate storage tank and the flash tank within the design range, with good liquid sealing effect and no steam leakage.
5 Manufacturing
5.1 Furnace Body
5.1.1 In addition to complying with the provisions of this standard, manufacturing, inspection and acceptance shall also comply with the provisions of JB2880. 5.1.2 The allowable deviation of the outer circumference of the section is ±3mm. 5.1.3 The number of longitudinal welds of each cylinder section: when the inner diameter of the furnace body is greater than 3.0m, there shall be no more than three; when the inner diameter is not greater than 3.0m, there shall be no more than two. The shortest arc length of the spliced plate shall not be less than 1/4 of the circumference. 5.1.4 When splicing, the shortest length of the cylinder section should not be less than 1m, and there shall be no more than one section close to 1m. And it should not be arranged near the rolling ring or the large gear ring.
5.1.5 The longitudinal welds of each adjacent section should be staggered, and the distance along the circumference shall not be less than 800mm. 5.1.6 The grooves of the longitudinal and circumferential welds of the cylinder section should be machined. When non-mechanical processing is used, the groove must be polished and smooth: the type and size of the groove should be checked after processing. 5.1.7 The misalignment b of the longitudinal weld joint shall not exceed 1mm (Figure 1); the misalignment b of the circumferential weld joint shall not exceed 10%5 and shall not exceed 2mm (Figure 1).
Longitudinal weld
Circumferential weld
5.1.8 When unequal thickness steel plates are butt-jointed, if the thickness difference between the two plates is greater than 30% of the thickness of the thin plate or exceeds 5mm, the edge of the thick plate shall be thinned on the outside of the simple section according to the requirements of L>3 (5-) shown in Figure 2HG/T2422-93
. The surface roughness of the L section Ra≤25μm, Figure 2
5.1.9 The edge angle E formed by the butt weld shall not exceed 3mm, and E, shall not exceed 2mm. The longitudinal weld shall be inspected with a sample with a chord length B equal to 1/6D (Figure 3): the circumferential weld shall be inspected with a check ruler with a length of not less than 300mm (Figure 4). Figure 3 Longitudinal weld
Figure 4 Circumferential weld
5.1.10 When the loose sleeve structure is used for rolling ring: the furnace body pad should be tightly fitted with the cylinder section, and the gap should not be greater than 0.5mm. 5.1.11 The weld between the furnace body pad and the furnace body should avoid the longitudinal weld of the section as much as possible. If it cannot be avoided, the longitudinal weld covered by the furnace body pad should be polished to be flush with the parent material.
5.1.12 After the furnace body pad and the cylinder section are welded, the overall annealing treatment is carried out to eliminate the welding residual stress, and then the furnace body pad is machined. 5.1.13 The furnace body weld should be subjected to 20% radiographic flaw detection inspection. According to GB3323, level II is qualified. 5.1.14 The welding of the alkali return pipe adopts continuous welding. The waist height of the fillet weld is equal to the wall thickness of the alkali return pipe. 5.1.15
is qualified. After welding, fill the alkali pipe with water for leakage test, or conduct a 0.05MPa compressed air leakage test. After maintaining the pressure for 10 minutes, check and there is no leakage. 5.1.16 The overall dimensions of the weld should meet the following requirements: HG/T2422-93
Welding seam excess height (see Figure 5) is in accordance with the provisions of Table 4 Figure 5
Welding seam depth
1216 The connection type between the heating tube and the steam chamber tube plate adopts strength expansion plus sealing welding or strength welding plus expansion, and complies with the provisions of GB151.
4.2.4.17 The rotary joint adopts graphite ring mechanical seal type or flexible graphite packing type. The life of the graphite ring should not be less than 8×10°h, and the replacement cycle of the flexible graphite packing should not be less than 4:3×10*h. 4.2.4.18 The sealing device of the furnace head and furnace tail adopts cylinder compression type end face seal. 4.2.4.19 Requirements for the main reducer
HG/T2422--93
Should comply with the provisions of ZBJ19004 and other standards
The manufacturing accuracy of the transmission gear shall not be less than the 8-7-7 level specified in GB10095. b.
The noise should not be greater than 85dB (A).
The cleanliness of the inner cavity shall not be lower than Class D specified in GB11368.d.
The number of stress cycles of high-speed gear shall not be lower than 5×107e
4.2.4.20 When calculating the thickness of the insulation layer, the outer surface temperature of the insulation layer shall be taken as 50℃. 4.2.4.21 The design life of the glow furnace shall generally not be lower than 15 years. 4.2.5 Electronic control
4.2.5.1 The continuous power supply to the motor shall be guaranteed. If the power is cut off due to an accident, the power supply must be restored within 15 minutes. 4.2.5.2 The electrical control circuits of the main motor and the auxiliary motor are interlocked to ensure that the main motor cannot be started when the clutch of the auxiliary motor is not removed.
4.2.5.3 The main motor with a variable frequency speed regulation device should consider setting a bypass starting circuit. 4.2.6 Instrumentation and Control
4.2.6.1 The instrument power supply shall adopt an uninterrupted power supply device, and the instrument compressed air pressure shall be maintained within the range required by the instrumentation and control equipment. 4.2.6.2 Automatic adjustment shall be adopted to keep the steam pressure entering the furnace and the flash steam pressure within the design range. 4.2.6.3 Automatic adjustment shall be adopted to keep the pressure in the furnace under negative pressure of 0~98Pa. 4.2.6.4 Automatic adjustment shall be adopted to keep the liquid level of the condensate storage tank and the flash tank within the design range, with good liquid sealing effect and no steam leakage.
5 Manufacturing
5.1 Furnace Body
5.1.1 In addition to complying with the provisions of this standard, manufacturing, inspection and acceptance shall also comply with the provisions of JB2880. 5.1.2 The allowable deviation of the outer circumference of the section is ±3mm. 5.1.3 The number of longitudinal welds of each cylinder section: when the inner diameter of the furnace body is greater than 3.0m, there shall be no more than three; when the inner diameter is not greater than 3.0m, there shall be no more than two. The shortest arc length of the spliced plate shall not be less than 1/4 of the circumference. 5.1.4 When splicing, the shortest length of the cylinder section should not be less than 1m, and there shall be no more than one section close to 1m. And it should not be arranged near the rolling ring or the large gear ring.
5.1.5 The longitudinal welds of each adjacent section should be staggered, and the distance along the circumference shall not be less than 800mm. 5.1.6 The grooves of the longitudinal and circumferential welds of the cylinder section should be machined. When non-mechanical processing is used, the groove must be polished and smooth: the type and size of the groove should be checked after processing. 5.1.7 The misalignment b of the longitudinal weld joint shall not exceed 1mm (Figure 1); the misalignment b of the circumferential weld joint shall not exceed 10%5 and shall not exceed 2mm (Figure 1).
Longitudinal weld
Circumferential weld
5.1.8 When unequal thickness steel plates are butt-jointed, if the thickness difference between the two plates is greater than 30% of the thickness of the thin plate or exceeds 5mm, the edge of the thick plate shall be thinned on the outside of the simple section according to the requirements of L>3 (5-) shown in Figure 2HG/T2422-93
. The surface roughness of the L section Ra≤25μm, Figure 2
5.1.9 The edge angle E formed by the butt weld shall not exceed 3mm, and E, shall not exceed 2mm. The longitudinal weld shall be inspected with a sample with a chord length B equal to 1/6D (Figure 3): the circumferential weld shall be inspected with a check ruler with a length of not less than 300mm (Figure 4). Figure 3 Longitudinal weld
Figure 4 Circumferential weld
5.1.10 When the loose sleeve structure is used for rolling ring: the furnace body pad should be tightly fitted with the cylinder section, and the gap should not be greater than 0.5mm. 5.1.11 The weld between the furnace body pad and the furnace body should avoid the longitudinal weld of the section as much as possible. If it cannot be avoided, the longitudinal weld covered by the furnace body pad should be polished to be flush with the parent material.
5.1.12 After the furnace body pad and the cylinder section are welded, the overall annealing treatment is carried out to eliminate the welding residual stress, and then the furnace body pad is machined. 5.1.13 The furnace body weld should be subjected to 20% radiographic flaw detection inspection. According to GB3323, level II is qualified. 5.1.14 The welding of the alkali return pipe adopts continuous welding. The waist height of the fillet weld is equal to the wall thickness of the alkali return pipe. 5.1.15
is qualified. After welding, fill the alkali pipe with water for leakage test, or conduct a 0.05MPa compressed air leakage test. After maintaining the pressure for 10 minutes, check and there is no leakage. 5.1.16 The overall dimensions of the weld should meet the following requirements: HG/T2422-93
Welding seam excess height (see Figure 5) is in accordance with the provisions of Table 4 Figure 5
Welding seam depth
1216 The connection type between the heating tube and the steam chamber tube plate adopts strength expansion plus sealing welding or strength welding plus expansion, and complies with the provisions of GB151.
4.2.4.17 The rotary joint adopts graphite ring mechanical seal type or flexible graphite packing type. The life of the graphite ring should not be less than 8×10°h, and the replacement cycle of the flexible graphite packing should not be less than 4:3×10*h. 4.2.4.18 The sealing device of the furnace head and furnace tail adopts cylinder compression type end face seal. 4.2.4.19 Requirements for the main reducer
HG/T2422--93
Should comply with the provisions of ZBJ19004 and other standards
The manufacturing accuracy of the transmission gear shall not be less than the 8-7-7 level specified in GB10095. b.
The noise should not be greater than 85dB (A).
The cleanliness of the inner cavity shall not be lower than Class D specified in GB11368.d.
The number of stress cycles of high-speed gear shall not be lower than 5×107e
4.2.4.20 When calculating the thickness of the insulation layer, the outer surface temperature of the insulation layer shall be taken as 50℃. 4.2.4.21 The design life of the glow furnace shall generally not be lower than 15 years. 4.2.5 Electronic control
4.2.5.1 The continuous power supply to the motor shall be guaranteed. If the power is cut off due to an accident, the power supply must be restored within 15 minutes. 4.2.5.2 The electrical control circuits of the main motor and the auxiliary motor are interlocked to ensure that the main motor cannot be started when the clutch of the auxiliary motor is not removed.
4.2.5.3 The main motor with a variable frequency speed regulation device should consider setting a bypass starting circuit. 4.2.6 Instrumentation and Control
4.2.6.1 The instrument power supply shall adopt an uninterrupted power supply device, and the instrument compressed air pressure shall be maintained within the range required by the instrumentation and control equipment. 4.2.6.2 Automatic adjustment shall be adopted to keep the steam pressure entering the furnace and the flash steam pressure within the design range. 4.2.6.3 Automatic adjustment shall be adopted to keep the pressure in the furnace under negative pressure of 0~98Pa. 4.2.6.4 Automatic adjustment shall be adopted to keep the liquid level of the condensate storage tank and the flash tank within the design range, with good liquid sealing effect and no steam leakage.
5 Manufacturing
5.1 Furnace Body
5.1.1 In addition to complying with the provisions of this standard, manufacturing, inspection and acceptance shall also comply with the provisions of JB2880. 5.1.2 The allowable deviation of the outer circumference of the section is ±3mm. 5.1.3 The number of longitudinal welds of each cylinder section: when the inner diameter of the furnace body is greater than 3.0m, there shall be no more than three; when the inner diameter is not greater than 3.0m, there shall be no more than two. The shortest arc length of the spliced plate shall not be less than 1/4 of the circumference. 5.1.4 When splicing, the shortest length of the cylinder section should not be less than 1m, and there shall be no more than one section close to 1m. And it should not be arranged near the rolling ring or the large gear ring.
5.1.5 The longitudinal welds of each adjacent section should be staggered, and the distance along the circumference shall not be less than 800mm. 5.1.6 The grooves of the longitudinal and circumferential welds of the cylinder section should be machined. When non-mechanical processing is used, the groove must be polished and smooth: the type and size of the groove should be checked after processing. 5.1.7 The misalignment b of the longitudinal weld joint shall not exceed 1mm (Figure 1); the misalignment b of the circumferential weld joint shall not exceed 10%5 and shall not exceed 2mm (Figure 1).
Longitudinal weld
Circumferential weld
5.1.8 When unequal thickness steel plates are butt-jointed, if the thickness difference between the two plates is greater than 30% of the thickness of the thin plate or exceeds 5mm, the edge of the thick plate shall be thinned on the outside of the simple section according to the requirements of L>3 (5-) shown in Figure 2HG/T2422-93
. The surface roughness of the L section Ra≤25μm, Figure 2
5.1.9 The edge angle E formed by the butt weld shall not exceed 3mm, and E, shall not exceed 2mm. The longitudinal weld shall be inspected with a sample with a chord length B equal to 1/6D (Figure 3): the circumferential weld shall be inspected with a check ruler with a length of not less than 300mm (Figure 4). Figure 3 Longitudinal weld
Figure 4 Circumferential weld
5.1.10 When the loose sleeve structure is used for rolling ring: the furnace body pad should be tightly fitted with the cylinder section, and the gap should not be greater than 0.5mm. 5.1.11 The weld between the furnace body pad and the furnace body should avoid the longitudinal weld of the section as much as possible. If it cannot be avoided, the longitudinal weld covered by the furnace body pad should be polished to be flush with the parent material.
5.1.12 After the furnace body pad and the cylinder section are welded, the overall annealing treatment is carried out to eliminate the welding residual stress, and then the furnace body pad is machined. 5.1.13 The furnace body weld should be subjected to 20% radiographic flaw detection inspection. According to GB3323, level II is qualified. 5.1.14 The welding of the alkali return pipe adopts continuous welding. The waist height of the fillet weld is equal to the wall thickness of the alkali return pipe. 5.1.15
is qualified. After welding, fill the alkali pipe with water for leakage test, or conduct a 0.05MPa compressed air leakage test. After maintaining the pressure for 10 minutes, check and there is no leakage. 5.1.16 The overall dimensions of the weld should meet the following requirements: HG/T2422-93
Welding seam excess height (see Figure 5) is in accordance with the provisions of Table 4 Figure 5
Welding seam depth
1211 The welds between the furnace body pad and the furnace body should avoid the longitudinal welds of the simple section as much as possible. If it is impossible to avoid, the longitudinal welds covered by the furnace body pad should be polished to be flush with the parent material.
5.1.12 After welding the furnace body pad and the tube section, the overall annealing treatment is carried out to eliminate the welding residual stress, and then the furnace body pad is machined. 5.1.13 The furnace body welds should be subjected to 20% radiographic flaw detection inspection. According to GB3323, level II is qualified. 5.1.14 The welding of the alkali return pipe adopts continuous welding. The waist height of the fillet weld is equal to the wall thickness of the alkali return pipe. 5.1.15
is qualified. After welding, fill the alkali pipe with water for leakage test, or conduct a 0.05MPa compressed air leakage test. After maintaining the pressure for 10 minutes, check and there is no leakage. 5.1.16 The overall dimensions of the weld should meet the following requirements: HG/T2422-93
Welding seam excess height (see Figure 5) is in accordance with the provisions of Table 4 Figure 5
Welding seam depth
1211 The welds between the furnace body pad and the furnace body should avoid the longitudinal welds of the simple section as much as possible. If it is impossible to avoid, the longitudinal welds covered by the furnace body pad should be polished to be flush with the parent material.
5.1.12 After welding the furnace body pad and the tube section, the overall annealing treatment is carried out to eliminate the welding residual stress, and then the furnace body pad is machined. 5.1.13 The furnace body welds should be subjected to 20% radiographic flaw detection inspection. According to GB3323, level II is qualified. 5.1.14 The welding of the alkali return pipe adopts continuous welding. The waist height of the fillet weld is equal to the wall thickness of the alkali return pipe. 5.1.15
is qualified. After welding, fill the alkali pipe with water for leakage test, or conduct a 0.05MPa compressed air leakage test. After maintaining the pressure for 10 minutes, check and there is no leakage. 5.1.16 The overall dimensions of the weld should meet the following requirements: HG/T2422-93
Welding seam excess height (see Figure 5) is in accordance with the provisions of Table 4 Figure 5
Welding seam depth
12
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