JB/T 10191-2000 Safety requirements for bag dust collectors Air distribution box for pulse injection bag dust collectors
Some standard content:
ICS13.030.50
J88
JB
Machinery Industry Standard of the People's Republic of China
JB10191-2000
Safety Requirements for Bag Dust Collector
Bag filter-Safety rules-Manifold for pulse-jet bag filter released on 2000-04-24
National Machinery Industry Bureau
released
2000 -10-01 Implementation
JB10191-2000
Foreword
The air distribution box of the pulse injection bag dust collector is a container that is repeatedly filled with compressed gas. In order to meet the needs of the environmental protection industry , to improve the quality of the air distribution box and make it meet the safety requirements, this standard is specially formulated. This standard refers to the calculation and design of "internal pressure cylinders", "non-circular cross-section vessels", "heads", etc. in GB150-1998 "Steel Pressure Vessels", and simplifies the relevant calculation formulas; combined with the environmental protection industry Features, it provides the basic parameters of commonly used air distribution boxes: pressure, volume, commonly used materials, cross-sections and head plate patterns. In Appendix A, the stress of various cross-sections is checked, and a reasonable, safe and reliable nominal thickness is given. value.
This standard also stipulates the requirements for box manufacturing and inspection to ensure manufacturing quality and safe use. Appendix A of this standard is an appendix to the standard.
This standard is proposed and centralized by the Environmental Protection Machinery Standardization Technical Committee. This standard is interpreted by the Environmental Protection Machinery Standardization Technical Committee. The unit responsible for drafting this standard: Beijing Kelin Environmental Protection Engineering Technology Research Institute. The main drafters of this standard: Gao Yun and Hu Jiemin. This standard is formulated for the first time.
1
1 scope
Machinery Industry Standard of the People's Republic of China
Bag dust collector
Safety requirements
Pulse injection bags BagfilterSafetyrulesManifoldforpulse-jetbagfiltenJB101912000
This standard specifies the design of steel square and circular cross-section air boxes with rounded corners (hereinafter referred to as the air box) for pulse injection bag dust collectors. Manufacturing and inspection requirements.
This standard is applicable to gas distribution boxes with operating temperatures of -20~+120℃, design pressure <0.7MPa, and filled with compressed gas for intermittent injection by pulse valves.
The following air distribution boxes are not within the scope of this standard: a) Square cross-section air distribution box with rounded corners, outer surface length H>300mm; b) Square cross-section air distribution box with external reinforcement with rounded corners. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB 150—1998
GB/T 713—1997
GB/T3274—1988
GB/T6654—1996
3 definitions
Steel pressure Vessels
Carbon steel and low alloy steel plates for boilers
Carbon structural steel and low alloy structural steel hot-rolled thick steel plates and steel strips for pressure vessels
This standard adopts the following definition.
3.1 Design pressure
The pressure used to determine the calculated thickness of the air distribution box, and its value shall not be lower than the working pressure. Pressure refers to gauge pressure. 3.2 Thickness
3.2.1 Calculated thickness
The thickness calculated according to the formulas in each chapter.
3.2.2 Design thickness
Calculate the sum of thickness and corrosion allowance.
3.2.3 Nominal thickness
The design thickness plus the negative deviation of the steel thickness is rounded upward to the thickness of the steel standard specification, which is the thickness marked on the drawing. 3.3 Film stress
National Machinery Industry Bureau 2000-04-24 approved implementation on 2000-10-01
1
JB 10191-2000
Thin-walled shell (diameter Much greater than the wall thickness) tangential tensile stress. 4Basic parameters
4.1 Welding joint coefficient
The air distribution box adopts single-sided welding butt joint (there is a backing plate close to the base metal along the root of the weld), and no non-destructive testing is performed. Take β= 0.7. 4.2 Additional thickness
The additional thickness is determined according to formula (1):
C=Ci+C2
In the formula: C-
-Thickness additional amount , mm;
Ci—negative deviation of steel thickness (according to 4.2.1), mm; C2
—corrosion allowance (according to 4.2.2), mm.
4.2.1 Negative deviation of steel plate thickness
(1)
The negative deviation of steel plate thickness is in accordance with the provisions of steel standards. When the negative deviation of the steel thickness is not greater than 0.25mm, the negative deviation can be ignored. 4.2.2 Corrosion margin
For carbon steel gas distribution boxes whose medium is compressed gas, the corrosion margin shall not be less than 1mm. 4.2.3 Cross-sectional dimensions
The cross-sectional dimensions are as specified in Table 1.
Table 1 Cross-sectional dimensions of the air distribution box
Air distribution box form
Sectional size
Square with rounded corners
180
Outside length
H
240
300
Outer diameter
4.3 Design pressure and hydraulic test pressure, according to the type of pulse valve used, according to the table 2 regulations. Table 2 The design pressure and hydraulic test pressure of the air distribution box adopt the pulse valve type
Design pressure
Hydraulic test pressure
5 Materials
5.1 For the air distribution box Steel should be Q235, 20g or 20R. Low-pressure pulse valve
0.4
0.52
5.2 The steel used for the gas distribution box should be accompanied by a steel quality certificate from the steel production unit. 5.3 The allowable stress of steel shall comply with the provisions of Table 3. 2
circle
shape
q159
@189
@219
@229
@402||tt ||mm
MPa
High pressure pulse valve
0.7
0.91
Steel
No.
Q235-A| |tt||20R
20g
Steel plate standard
GB/T3274
GB/T6654
GB/T713
Usage status| |tt||Hot rolled
Hot rolled and normalized
Hot rolled and normalized
Square air distribution box with rounded corners
6
6.1 Structure
JB 10191-2000
Table 3 Allowable stress of steel
Thickness
mm
4.5~16
6~16| |tt||6~16
Normal temperature strength index
MPa
Op
375
400
400
as
235
245
245
Allowable stress for operating temperature <120℃
MPa
113
132
132
6.1.1 The cross-section of the square air distribution box with rounded corners is shown in Figure 1. The side panels of the box have the same angle as the rounded corners, and the radius r of the rounded corners should be greater than or equal to 3 times the thickness of the side panels.
6.1.2 The end plates at both ends of the air distribution box are flat plates, as shown in Figure 2. 8
23
f-1.258,
Picture 1 Cross-section of square air distribution box with rounded corners
Picture 2 End plate cross-section
6.2 Air distribution For the calculation of the box, the structural dimensions should be set first, and then the stress should be checked as required until the requirements are met. 6.3 Symbol
The distance from the neutral axis of the C plate section to the inner or outer surface of the section, mm; H——the outer length of the box section, mm;
The calculated moment of inertia of the plate section, mm *:
K3—parameter, mm2;
L—half length of the straight edge of the box side plate, mm; MA bending moment, N·mm;
—design pressure , MPa;
Section fillet inner radius, mm:
8,—The calculated thickness of the box side panels, mm
82—The calculated thickness of the box end plates, mm; Q.
Om
O
oT||tt ||[at-
-Material yield point at room temperature, MPa:
-Thin film stress, MPa:
Bending stress, MPa:
Total stress (0m+ 0), MPa |
6.4 Side plate stress check
a) Side plate
The film stress of point A and point B of the side plate is calculated according to the formula (2) o box, o=p(L+ r)/8
The bending stress at point A and point B of the side plate is calculated according to equation (3) and equation (4) respectively: OA=MACII...
B=C ( 2MA+pL'L,)/2I
where: MA=pK3L,, N·mm:
K3=-12 (2.582+4.72+2)/(9.424+12), mm2 :L,=1 mm.
Stress check:
≤[a
a≤[a]t
C4=0A+0A≤1.5[ 0]'
= o+oB≤1.5[}
b) Fillet area
The film stress is calculated according to equation (5):
oBC=p(
The bending stress is calculated according to equation (5) 6) Calculation:
oBC[2 MA+pLL (0.828 r+ L) J/2 1 where: L,=1 mm.
Stress verification:
≤ [
C=0C+oBC≤1.5[ 0]t
The calculated thickness of the 6.5-minute air box end plate is calculated according to formula (7): 82=(H-281)/0.44p/[ α]
4
(2)
(3)
(4)
(5)
(6)|| tt||(7)
7 Circular air distribution box
7.1 Structure
JB10191-2000
7.1.1 The cross-section of the circular air distribution box is shown in Figure 3 Generally, steel pipes are used. 7.1.2 The standard oval heads used at both ends shall comply with the provisions of Chapter 7 of GB150-1998, as shown in Figure 4. The straight edge height of the head shall be h≥25mm.
Figure 3 Cross-sectional view of the circular air distribution box
7.1.3 Round flat covers are used at both ends as shown in Figure 5. 7.1.4 Barrel flange
F1.258.
Figure 5 round flat cover
Figure 4 standard oval head
The flange welded on the cylinder, used to connect to the submerged pulse valve, its structural dimensions As shown in Figure 6. The outer diameter D and inner diameter d5 of the flange
JB 10191-2000
should be consistent with the outer and inner diameters of the pulse valve chassis, and the thickness S3 is 1~2 times the nominal thickness of the cylinder. times, and not less than 10mm D
d
Figure 6 Structural dimensions of cylinder flange
7.2 symbol
-Inner diameter of cylinder and head, mm;
Di
p
81
Design pressure, MPa;
Calculated thickness of cylinder, mm;
82— Calculated thickness of the head or flat cover, mm: [α] - allowable stress of the cylinder and head material at the design temperature, MPa; - welded joint coefficient
7.3 Cylinder calculation||tt| |Cylinder calculation according to formula (8):
81=
7.4 Head calculation
Head calculation according to formula (9):
82||tt| |7.5 Calculation of flat cover
Calculation of flat cover according to formula (10):
pD,
2[a]-
pD
2[a ]t-0.5p
82= D; /0.44p/[]
8Manufacturing
8.1 The circular shape shall comply with the provisions of this standard and drawings. 8.2
(8)
(9)
(10)
Girth welds and circular shapes of circular boxes and heads [excluding appendices to this standard A (Standard appendix) Welded steel pipes in A2], longitudinal welds of square boxes should be butt single-sided welding with a permanent backing plate. The backing plate material should be consistent with the box material and close to the box body. . The shape and size of the welding slope 6
JB10191-2000
shall comply with the provisions of Figure 7, and the surface of the groove shall be free of defects such as cracks, delamination, and slag inclusions. 0
α
b
20~30
Figure 7 Shape and size of welding groove
p
6~26| |tt||45°~55°
3~6
0~2
8.3 Before welding, the groove and the surface within 20mm of both sides of the base metal should be removed (within oxides, oil, slag and other harmful impurities.
8.4 The square box is allowed to have interfaces along the length direction, but the upper and lower interfaces should be staggered, and the distance should not be less than 100mm. The upper interface should also avoid the edge of the pulse valve opening by at least 40mm. See Figure A1. 8.5 The straightness tolerance along the length direction of the box after welding is 0.25% of its length. 8.6 When welding, arc ignition is not allowed in non-welding areas. The longitudinal weld seam should have an arc starting plate and an arc extinguishing plate, and the length of the plates should not be less than 100mm. When removing the arc initiating and extinguishing plates, the cutting method should be used, and the tapping method is strictly prohibited. The resection should be smoothed. 8.7 The undercut depth of all welds shall not be greater than 0.5mm, and the continuous undercut length shall not be greater than 100mm. There must be no cracks, craters, depressions and irregular mutations on the surface of the weld and the heat affected zone, and the spatter on both sides of the weld must be removed. 8.8 The reinforcement of all welds shall be 0~3mm, and the difference between the widest and narrowest parts of the same weld shall not be greater than 3mm. 8.9 The leg height of the fillet weld between the end plate, the pipe and the box should not be less than the thickness of the thinner of the phase weldments. 8.10 The outer surface of the box should be smooth and free of defects such as cracks, heavy skins, inclusions, pits, scratches, and corrosion with a depth exceeding 0.5mm. Otherwise, it should be ground. The grinding area should be smooth. After grinding, the wall thickness shall not be less than the sum of the calculated thickness and corrosion allowance. 8.11 Weld repair
If leakage is found on the weld during the hydraulic test, repair shall be carried out. After repair, the hydraulic test shall be re-carried out in accordance with the provisions of 10.3, and the number of repairs shall not exceed two times.
9 Painting
9.1 Before painting, the surface of the air distribution box should be dry, and oil, rust and welding spatter should be removed. 9.2 Apply two coats of primer and one topcoat to the outer surface of the air distribution box. 10 Inspection | |tt | The equipment certificate is provided to the user unit at the same time. 10.2 Appearance inspection
Visually inspect the surface of the air distribution box and the appearance of the welds. 10.3 Hydrostatic test
5[}
b) The film stress in the fillet area
is calculated according to equation (5):
oBC=p(
The bending stress is calculated according to equation (6):
oBC[2 MA+pLL (0.828 r+ L) J/2 1 where: L,=1 mm.
Stress calibration:
≤[||tt ||C=0C+oBC≤1.5[ 0]t
The calculated thickness of the 6.5-minute air box end plate is calculated according to formula (7): 82=(H-281)/0.44p/[α]|| tt||4
(2)
(3)
(4)
(5)
(6)
( 7)
7 circular air distribution box
7.1 structure
JB10191-2000
7.1.1 The cross section of the circular air distribution box is shown in Figure 3, which is generally used Steel pipe. 7.1.2 The standard oval heads at both ends shall comply with the provisions of Chapter 7 of GB150-1998, as shown in Figure 4. The straight edge height of the head shall be ≥25mm. |Figure 3 Cross-sectional view of the circular air distribution box
7.1.3 Round flat covers are used at both ends as shown in Figure 5.
F1.258||tt| |Figure 5 round flat cover
Figure 4 standard oval head
The flange welded on the cylinder is used to connect to the submerged pulse valve. Its structural dimensions are as shown in Figure 6 shown. The outer diameter D and inner diameter d5 of the flange
JB 10191-2000
should be consistent with the outer and inner diameters of the pulse valve chassis, and the thickness S3 should be 1 to 2 times the nominal thickness of the cylinder, and should not Less than 10mm. D
d
Figure 6 Structural dimensions of cylinder flange
7.2 symbol
-Inner diameter of cylinder and head, mm;|| tt||Di
p
81
Design pressure, MPa;
Calculated thickness of cylinder, mm;
82—Head or flat Calculated thickness of cover, mm: [α] - allowable stress of cylinder and head material at design temperature, MPa; - welded joint coefficient
7.3 Cylinder calculation
Cylinder calculation. According to formula (8):
81=
7.4 head calculation
Head calculation according to formula (9):
82
7.5 flat cover Calculate
flat cover according to formula (10):
pD,
2[a]-
pD
2[a]t-0.5 p
82= D; /0.44p/[]
8 Manufacturing
8.1 Circular forming shall comply with the provisions of this standard and drawings 8.2
(8)
(9)
(10)
The circumferential welds of the circular box and the head and the circular [excluding those in Appendix A of this standard (standard appendix) A2 Welded steel pipes], longitudinal welds of square boxes should be butt-joined single-sided welding with a permanent backing plate. The backing plate material should be consistent with the box material and close to the box body. The shape and size of the welding slope 6
JB10191-2000
shall comply with the provisions of Figure 7, and the surface of the groove shall be free of defects such as cracks, delamination, and slag inclusions. 0
α
b
20~30
Figure 7 Shape and size of welding groove
pwww.bzxz.net
6~26| |tt||45°~55°
3~6
0~2
8.3 Before welding, the groove and the surface within 20mm of both sides of the base metal should be removed (within oxides, oil, slag and other harmful impurities.
8.4 The square box is allowed to have interfaces along the length direction, but the upper and lower interfaces should be staggered, and the distance should not be less than 100mm. The upper interface should also avoid the edge of the pulse valve opening by at least 40mm. See Figure A1. 8.5 The straightness tolerance along the length direction of the box after welding is 0.25% of its length. 8.6 When welding, arc ignition is not allowed in non-welding areas. The longitudinal weld seam should have an arc starting plate and an arc extinguishing plate, and the length of the plates should not be less than 100mm. When removing the arc initiating and extinguishing plates, the cutting method should be used, and the tapping method is strictly prohibited. The resection should be smoothed. 8.7 The undercut depth of all welds shall not be greater than 0.5mm, and the continuous undercut length shall not be greater than 100mm. There must be no cracks, craters, depressions and irregular mutations on the surface of the weld and the heat affected zone, and the spatter on both sides of the weld must be removed. 8.8 The reinforcement of all welds shall be 0~3mm, and the difference between the widest and narrowest parts of the same weld shall not be greater than 3mm. 8.9 The leg height of the fillet weld between the end plate, the pipe and the box should not be less than the thickness of the thinner of the phase weldments. 8.10 The outer surface of the box should be smooth and free of defects such as cracks, heavy skins, inclusions, pits, scratches, and corrosion with a depth exceeding 0.5mm. Otherwise, it should be ground. The grinding area should be smooth. After grinding, the wall thickness shall not be less than the sum of the calculated thickness and corrosion allowance. 8.11 Weld repair
If leakage is found on the weld during the hydraulic test, repair shall be carried out. After repair, the hydraulic test shall be re-carried out in accordance with the provisions of 10.3, and the number of repairs shall not exceed two times.
9 Painting
9.1 Before painting, the surface of the air distribution box should be dry, and oil, rust and welding spatter should be removed. 9.2 Apply two coats of primer and one topcoat to the outer surface of the air distribution box. 10 Inspection | |tt | The equipment certificate is provided to the user unit at the same time. 10.2 Appearance inspection
Visually inspect the surface of the air distribution box and the appearance of the welds. 10.3 Hydrostatic test
5[}
b) The film stress in the fillet area
is calculated according to equation (5):
oBC=p(
The bending stress is calculated according to equation (6):
oBC[2 MA+pLL (0.828 r+ L) J/2 1 where: L,=1 mm.
Stress calibration:
≤[||tt ||C=0C+oBC≤1.5[ 0]t
The calculated thickness of the 6.5-minute air box end plate is calculated according to formula (7): 82=(H-281)/0.44p/[α]|| tt||4
(2)
(3)
(4)
(5)
(6)
( 7)
7 circular air distribution box
7.1 structure
JB10191-2000
7.1.1 The cross section of the circular air distribution box is shown in Figure 3, which is generally used Steel pipe. 7.1.2 The standard oval heads at both ends shall comply with the provisions of Chapter 7 of GB150-1998, as shown in Figure 4. The straight edge height of the head shall be ≥25mm. |Figure 3 Cross-sectional view of the circular air distribution box
7.1.3 Round flat covers are used at both ends as shown in Figure 5.
F1.258||tt| |Figure 5 round flat cover
Figure 4 standard oval head
The flange welded on the cylinder is used to connect to the submerged pulse valve. Its structural dimensions are as shown in Figure 6 shown. The outer diameter D and inner diameter d5 of the flange
JB 10191-2000
should be consistent with the outer and inner diameters of the pulse valve chassis, and the thickness S3 should be 1 to 2 times the nominal thickness of the cylinder, and should not Less than 10mm. D
d
Figure 6 Structural dimensions of cylinder flange
7.2 symbol
-Inner diameter of cylinder and head, mm;|| tt||Di
p
81
Design pressure, MPa;
Calculated thickness of cylinder, mm;
82—Head or flat Calculated thickness of cover, mm: [α] - allowable stress of cylinder and head material at design temperature, MPa; - welded joint coefficient
7.3 Cylinder calculation
Cylinder calculation. According to formula (8):
81=
7.4 head calculation
Head calculation according to formula (9):
82
7.5 flat cover Calculate
flat cover according to formula (10):
pD,
2[a]-
pD
2[a]t-0.5 p
82= D; /0.44p/[]
8 Manufacturing
8.1 Circular forming shall comply with the provisions of this standard and drawings 8.2
(8)
(9)
(10)
The circumferential welds of the circular box and the head and the circular [excluding those in Appendix A of this standard (standard appendix) A2 Welded steel pipes], longitudinal welds of square boxes should be butt-joined single-sided welding with a permanent backing plate. The backing plate material should be consistent with the box material and close to the box body. The shape and size of the welding slope 6
JB10191-2000
shall comply with the provisions of Figure 7, and the surface of the groove shall be free of defects such as cracks, delamination, and slag inclusions. 0
α
b
20~30
Figure 7 Shape and size of welding groove
p
6~26| |tt||45°~55°
3~6
0~2
8.3 Before welding, the groove and the surface within 20mm of both sides of the base metal should be removed (within oxides, oil, slag and other harmful impurities.
8.4 The square box is allowed to have interfaces along the length direction, but the upper and lower interfaces should be staggered, and the distance should not be less than 100mm. The upper interface should also avoid the edge of the pulse valve opening by at least 40mm. See Figure A1. 8.5 The straightness tolerance along the length direction of the box after welding is 0.25% of its length. 8.6 When welding, arc ignition is not allowed in non-welding areas. The longitudinal weld seam should have an arc starting plate and an arc extinguishing plate, and the length of the plates should not be less than 100mm. When removing the arc initiating and extinguishing plates, the cutting method should be used, and the tapping method is strictly prohibited. The resection should be smoothed. 8.7 The undercut depth of all welds shall not be greater than 0.5mm, and the continuous undercut length shall not be greater than 100mm. There must be no cracks, craters, depressions and irregular mutations on the surface of the weld and the heat affected zone, and the spatter on both sides of the weld must be removed. 8.8 The reinforcement of all welds shall be 0~3mm, and the difference between the widest and narrowest parts of the same weld shall not be greater than 3mm. 8.9 The leg height of the fillet weld between the end plate, the pipe and the box should not be less than the thickness of the thinner of the phase weldments. 8.10 The outer surface of the box should be smooth and free of defects such as cracks, heavy skins, inclusions, pits, scratches, and corrosion with a depth exceeding 0.5mm. Otherwise, it should be ground. The grinding area should be smooth. After grinding, the wall thickness shall not be less than the sum of the calculated thickness and corrosion allowance. 8.11 Weld repair
If leakage is found on the weld during the hydraulic test, repair shall be carried out. After repair, the hydraulic test shall be re-carried out in accordance with the provisions of 10.3, and the number of repairs shall not exceed two times.
9 Painting
9.1 Before painting, the surface of the air distribution box should be dry, and oil, rust and welding spatter should be removed. 9.2 Apply two coats of primer and one topcoat to the outer surface of the air distribution box. 10 Inspection | |tt | The equipment certificate is provided to the user unit at the same time. 10.2 Appearance inspection
Visually inspect the surface of the air distribution box and the appearance of the welds. 10.3 Hydrostatic test
2
(8)
(9)
(10)
Girth welds and circular shapes of circular boxes and heads [excluding appendices to this standard] A (Standard appendix) Welded steel pipes in A2], longitudinal welds of square boxes should be butt single-sided welding with a permanent backing plate. The backing plate material should be consistent with the box material and close to the box body. . The shape and size of the welding slope 6
JB10191-2000
shall comply with the provisions of Figure 7, and the surface of the groove shall be free of defects such as cracks, delamination, and slag inclusions. 0
α
b
20~30
Figure 7 Shape and size of welding groove
p
6~26| |tt||45°~55°
3~6
0~2
8.3 Before welding, the groove and the surface within 20mm of both sides of the base metal should be removed (within oxides, oil, slag and other harmful impurities.
8.4 The square box is allowed to have interfaces along the length direction, but the upper and lower interfaces should be staggered, and the distance should not be less than 100mm. The upper interface should also avoid the edge of the pulse valve opening by at least 40mm. See Figure A1. 8.5 The straightness tolerance along the length direction of the box after welding is 0.25% of its length. 8.6 When welding, arc ignition is not allowed in non-welding areas. The longitudinal weld seam should have an arc starting plate and an arc extinguishing plate, and the length of the plates should not be less than 100mm. When removing the arc initiating and extinguishing plates, the cutting method should be used, and the tapping method is strictly prohibited. The resection should be smoothed. 8.7 The undercut depth of all welds shall not be greater than 0.5mm, and the continuous length of the undercut shall not be greater than 100mm. There must be no cracks, craters, depressions and irregular mutations on the surface of the weld and the heat affected zone, and the spatter on both sides of the weld must be removed. 8.8 The reinforcement of all welds shall be 0~3mm, and the difference between the widest and narrowest parts of the same weld shall not be greater than 3mm. 8.9 The leg height of the fillet weld between the end plate, the pipe and the box should not be less than the thickness of the thinner of the phase weldments. 8.10 The outer surface of the box should be smooth and free of defects such as cracks, heavy skins, inclusions, pits, scratches, and corrosion with a depth exceeding 0.5mm. Otherwise, it should be ground. The grinding area should be smooth. After grinding, the wall thickness shall not be less than the sum of the calculated thickness and corrosion allowance. 8.11 Weld repair
If leakage is found on the weld during the hydraulic test, repair shall be carried out. After repair, the hydraulic test shall be re-carried out according to the provisions of 10.3, and the number of repairs shall not exceed two times.
9 Painting
9.1 Before painting, the surface of the air distribution box should be dry, and remove oil stains, rust and welding spatter. 9.2 Apply two coats of primer and one topcoat to the outer surface of the air distribution box. 10 Inspection
The manufacturer should carefully check and inspect the grade and specifications of the air distribution box material, and should use the material's quality assurance sheet (or a duplicate 10.1
print) as a technical document and dust removal The equipment certificate is provided to the user unit at the same time. 10.2 Appearance inspection
Visually inspect the surface of the air distribution box and the appearance of the welds. 10.3 Hydrostatic test
2
(8)
(9)
(10)
Girth welds and circular shapes of circular boxes and heads [excluding appendices to this standard] A (Standard appendix) Welded steel pipes in A2], longitudinal welds of square boxes should be butt single-sided welding with a permanent backing plate. The backing plate material should be consistent with the box material and close to the box body. . The shape and size of the welding slope 6
JB10191-2000
shall comply with the provisions of Figure 7, and the surface of the groove shall be free of defects such as cracks, delamination, and slag inclusions. 0
α
b
20~30
Figure 7 Shape and size of welding groove
p
6~26| |tt||45°~55°
3~6
0~2
8.3 Before welding, the groove and the surface within 20mm of both sides of the base metal should be removed (within oxides, oil, slag and other harmful impurities.
8.4 The square box is allowed to have interfaces along the length direction, but the upper and lower interfaces should be staggered, and the distance should not be less than 100mm. The upper interface should also avoid the edge of the pulse valve opening by at least 40mm. See Figure A1. 8.5 The straightness tolerance along the length direction of the box after welding is 0.25% of its length. 8.6 When welding, arc ignition is not allowed in non-welding areas. The longitudinal weld seam should have an arc starting plate and an arc extinguishing plate, and the length of the plates should not be less than 100mm. When removing the arc initiating and extinguishing plates, the cutting method should be used, and the tapping method is strictly prohibited. The resection should be smoothed. 8.7 The undercut depth of all welds shall not be greater than 0.5mm, and the continuous undercut length shall not be greater than 100mm. There must be no cracks, craters, depressions and irregular mutations on the surface of the weld and the heat affected zone, and the spatter on both sides of the weld must be removed. 8.8 The reinforcement of all welds shall be 0~3mm, and the difference between the widest and narrowest parts of the same weld shall not be greater than 3mm. 8.9 The leg height of the fillet weld between the end plate, the pipe and the box should not be less than the thickness of the thinner of the phase weldments. 8.10 The outer surface of the box should be smooth and free of defects such as cracks, heavy skins, inclusions, pits, scratches, and corrosion with a depth exceeding 0.5mm. Otherwise, it should be ground. The grinding area should be smooth. After grinding, the wall thickness shall not be less than the sum of the calculated thickness and corrosion allowance. 8.11 Weld repair
If leakage is found on the weld during the hydraulic test, repair shall be carried out. After repair, the hydraulic test shall be re-carried out in accordance with the provisions of 10.3. The number of repairs shall not exceed two times.
9 Painting
9.1 Before painting, the surface of the air distribution box should be dry, and oil, rust and welding spatter should be removed. 9.2 Apply two coats of primer and one topcoat to the outer surface of the air distribution box. 10 Inspection | |tt | The equipment certificate is provided to the user unit at the same time. 10.2 Appearance inspection
Visually inspect the surface of the air distribution box and the appearance of the welds. 10.3 Hydrostatic test
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