JB/T 5000.11-1998 General technical conditions for piping of heavy machinery
Some standard content:
ICS23.040.01
J15
JB
Machinery Industry Standard of the People's Republic of China
JB/T5000.11-1998
General Technical Conditions for Heavy Machinery|| tt||Piping
The heavy mechanical general techniques and standardsAttached piping
Released on 1998-09-30
National Machinery Industry Bureau
Released
1998- 12-01 Implementation
JB/T5000.11-1998
Previous
Preface
Appendix A of this standard is an appendix to the standard,
this standard It was proposed and managed by the Metallurgical Equipment Standardization Technical Committee of the Ministry of Machinery Industry. The organization responsible for authoring this standard: First Heavy Machinery Group Corporation, and the organization participating in the drafting of this standard: Xi'an Heavy Machinery Research Institute. The main drafters of this standard: Liu Zhen and Zhao Liping. Scope
Mechanical industry standards of the People's Republic of China
General technical conditions for heavy machinery
Assembling
Pipe
The heavy mechanical general techniques and standardsAttached piping||tt ||This standard specifies the technical and safety requirements for piping. JB/T5000.11-1998
This standard is applicable to oil lubrication, grease leakage, hydraulic, pneumatic and industrial water piping on the body of heavy-duty machinery products. This standard does not apply to pressure vessel piping. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard through reference 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. GB3765—83
GB 730687
GB 730787
GB/T 12716—91
JB/T 5000.11998
JB/T 5000.31998||tt| |JB/T 5000.121998
3 Piping technical requirements
Technical conditions for ferrule type pipe joints
Pipe threads sealed with threads
Pipe threads not sealed with threads|| tt||60° conical pipe thread
General technical conditions for heavy machine core product inspection General technical conditions for heavy machine quilts Welding parts
General technical conditions for heavy machinery painting
3.1 Pipes, parts Inspection before component piping
3.1, manufacturing! \Self-made parts must be inspected by the quality inspection department before they can be assembled. 3.1.2 Outsourced materials and parts should comply with the relevant provisions of JB/T5000.1. 3.1.3 Confirm the diameter, material and wall thickness of the pipe. 3.2 The pipe should be cut with a saw. It can also be cut with a grinding wheel. However, flame cutting is not allowed, and the flatness and verticality of the cut pipe section should comply with the requirements in Table 1.
Table 1
Item
Item
Section flatness
Drawing approved by the National Machinery Industry Bureau 1998-09-30
|tt||Require
Ask
islmm
1998-12-01 Implementation
item
item
Degree
JB/T5000.11~1998
Table 1 (End)
Picture
Requirement
Ask
e30||tt ||3.3 All pipe ends should be removed from flash, burrs and chamfered before assembly. Use compressed air or other methods to remove debris and floating rust attached to the pipe.
3.4 ??Pipe bending radius and tolerance
3.4.1 Pipe bending should generally be performed on a pipe bending machine at room temperature. The bending radius R is connected to the provisions of Figure 1, Formula (1) and Formula (2). When the pipe is hot-bent, it should comply with the provisions of 5.5 in JB/T5000.3-1998. Figure 1
D≤42mm.R≥2.5D
D>42mm,R≥3D
where: R——bending radius:
outer diameter of the pipe .
D-
3.4.2 When bending welded steel pipes, the welds should be located on the side in the bending direction. 3.4.3 Bending radius deviation
a) When the outer diameter D of the pipe is not less than 30mm, the bending radius deviation shall be in accordance with the relevant provisions of JB/T5000.3. b) When the outer diameter D of the pipe is less than 30mm, the bending radius deviation shall not be greater than ±1mm. 3.5 Roundness tolerance and corrugation depth at the bend of the pipe (1)
(2)
3.5.1 When the outer diameter D of the pipe is not less than 30mm, the roundness tolerance and corrugation depth shall be in accordance with JB/T5000.3 -The provisions of Table 4 of 1998. 3.5.2 When the outer diameter D of the pipe is less than 30mm, the roundness tolerance E shall not be greater than 10%. According to the provisions of Figure 2 and Formula (3), corrugation and distortion are not allowed.
Figure 2
2
Where, E roundness tolerance, %;
D--pipe outer diameter, mm:
a-- Diameter of the major axis, mm;
Diameter of the minor axis, mm.
JB/T 5000.111998
E
D
(4) Calculation: TT
T--pipe wall thickness before bending, mm;
T pipe wall thickness after bending, mm.
Note: Use the pipe head to unbend the specimen for inspection after bending, or use a sonic protozoometer for inspection. 3.7 The bending angle deviation of the pipe shall not be greater than 1°, see Figure 3, Figure 3
Note: Use a special ruler or place an angle template on a flat plate to compare the measurement with the pipe. 3.8 The deviation of each section size and total length of the pipe after bending is not greater than ±2mm, see Figure 4. 6±2
Lt:
Figure 4
(3)||tt| |(4)
3.9 The arrangement of pipes should be horizontal and vertical, neat and beautiful. The straightness tolerance and mutual parallelism tolerance within any one meter shall not be greater than 2mm, and the total length shall not be greater than 5mm.
3.10 Pipe thread processing should comply with the regulations of GB7306, GB7307 and GB/T12716 respectively. 3.11 The surface of the body used to fix pipe clamps, supports and other components should be straight and should not affect the neat arrangement of the pipelines, otherwise it should Trim. 3.12 The various pipelines arranged on the machine body should not interfere with each other and be easy to disassemble and assemble. Pipes crossing the same plane must not come into contact. 3.13 Before assembly, all steel pipes (including prefabricated pipes) must be degreased, pickled, neutralized, washed and rust-proofed. The welded stainless steel pipes are only pickled and not rust-proofed. Stainless steel pipes and copper pipes are not acid-proofed. Washing, no rust prevention. Rust removal must reach the Be level specified in Appendix A of JB/T5000.12-1998. In order to prevent the anti-rust paint from chemical decomposition, the outer surface can be coated with anti-rust paint only after 48 hours of pickling and phosphating treatment. The quality of the phosphating film should be guaranteed for packaging. It should not rust before painting. Coating should comply with the relevant provisions of JB/T5000.12. 3.14 During assembly, tighten parts such as pipe clamps, supports, flanges and joints that are fixed with threaded connections to prevent loosening. Straight edge size and angle 3
Deviation is connected to Figure 5 and Figure 6.
Figure 5
JB/T5000.11-1998
3.15 When the sealing tape is fully wound, The sealing tape should be kept clean and dust and other debris should not adhere to it. Figure 6 | When wrapping pipe threads smaller than 3/8 with sealing tape, use 1/2 tape width for wrapping. Winding direction
Sealing cavity tape
Tape range
Figure 7
3.17 When the sealed parts need to be repaired, the sealing tape attached to the internal and external threads must be completely removed Remove. 1~2hu
3.18 Steel pipes connected by ferrule-type pipe joints should be pickled first, and then the ferrules should be pre-tightened on the pipe ends. The ferrule type pipe joints should be assembled according to Appendix A in GB3765-83.
3.19 Sealing and pressure resistance test
3.19.1 The welded parts of the prefabricated pipes must be subjected to a pressure test. The test pressure is 1. of work pressure.5 times, and keep the pressure for 10 minutes. There should be no leakage or other abnormal phenomena. The pipes after the test should be marked. 3.19.2 The assembled pipelines should be sealed and pressure tested according to different systems. 3.19.2.1 For the two-line system of grease lubricating pipelines, the test pressure is 1.25 times the system working pressure. The test pressure of non-two-line systems is the system working pressure. After reaching the test pressure, maintain the pressure for 10 minutes and check that there should be no leakage everywhere. 3.19.2.2 The oil lubrication system pipeline is pressure tested at 1.25 times the working pressure, maintained for 10 minutes, and then lowered to the working pressure for a comprehensive inspection. There should be no leakage or other abnormal phenomena. 3.19.2.3 For the pneumatic system pipelines, conduct a pressure test at 1.15 times the working pressure, maintain the pressure for 10 minutes, and then reduce it to the working pressure for a comprehensive inspection. There should be no leakage or deformation
3.19.2.4 Hydraulic and industrial water system pipes Road pressure should meet the requirements in Table 2. Keep the pressure for 10 minutes and there should be no leakage. Table 2
System working pressure p,
Test pressure
<16.0
1.50p.
16.0~31.5
1.25p| |tt||MPa
>31.5
1.15p
3.20 When the piping is disassembled or transferred, the separation port of the pipeline must be sealed with tape or plastic pipe to prevent any debris Enter. and tag. 4
Enter the assembly position number on the label.
JB/T5000.11-1998
3.21 Brackets, pipe clamps, etc. used to fix pipe fittings can be adjusted according to actual needs to determine their position. See Appendix A (standard appendix) for the pipe clamp assembly position and assembly method.
3.22 For pipelines that are disassembled and packaged for shipment, the printed mark given in the design drawing should be written on the printed paper label, put into a plastic bag, and tied to the pipe.
3.23 Flushing inspection. Industrial water pipelines have been pickled. After pre-assembly, water flushing inspection (except valves) must be carried out to ensure that the pipeline cleanliness requirements are met. See Table 3. For grease lubrication System, after the piping is completed, remove the connections at the inlets of each grease feeding device (distributor, valve, etc.). Perform grease cleaning. Do not connect until the grease that flows out is clean and has no abnormal color. For ordinary oil lubrication, the hydraulic system should be cleaned with oil. After cleaning for a period of time, take 100mL of cleaning fluid from a beaker or glass and place it in a bright place for 30 minutes. After visual inspection to confirm that there are no impurities, it is qualified. For cleanliness For oil lubrication higher than this requirement, the hydraulic system should be indicated on the drawing. Table 3
Pipe name
Equal diameter
Industrial water pipe
Road
Inlet pressure, flow rate
Choose the appropriate one The pressure and
flow rate make the liquid in the tube reach the
system flow state
decay state at the outlet
liquid column high open pipe orifice level
injection length Not less than 100
mm
Export liquid filtration requirements
Use 180~240 mesh to pass
filter for 2 minutes, no
residue is Qualified
Prepare
Note
During the washing process, use a wooden
stick or plastic rod to hit the face section by section,
to wash away the impurities|| tt||3.24 Pipes that are completely pre-assembled according to the drawings. Adjustment pipes should be set aside according to the general assembly requirements, and the size should be determined after measurement. 4 Pipe welding technical requirements
4.1 Welders should be specially trained and qualified before they can serve as piping welding work. 4.2 When welding steel pipes, hydraulic and lubrication pipelines must be primed with tungsten arc welding or tungsten chlorine arc welding. When the pressure exceeds 21MPa, approximately 5L/min of argon and hydrogen gas should be circulated inside the pipe at the same time. Other pipelines are generally made using tungsten hydrogen arc welding or tungsten hydrogen arc welding. The welding seam is welded on one side and formed on both sides. The weld must not have incomplete fusion, incomplete penetration, or slag inclusion. The shape and size of the groove for pipe butt welding are shown in Table 4. 4.3
Table 4
Pipe wall thickness!
2. 0
>2. ~20
Welding continuation symbol
Type 1 weld
Y-type weld
y
Illustration
The shape of the groove welded with coated electrodes
mm
The shape of the groove welded by gas shielded welding
5||tt| |Tube wall thickness!
>20
Welding key symbol
U-shaped weld
U
Illustration
JB/T5000.11-1998| |tt||Table 4 (End)
Bevel shape welded with coated electrodes
10*±1
05
mm
Use gas The groove shape of shielded welding
37.s*±*.5*
main 0
4.4 The misalignment tolerance e of the butt joint between the pipe and the pipe (or joint) is not greater than 0.15 , the maximum does not exceed 1.5mm, see Figure 8. Figure 8
4.5 The welding requirements for pipe and flange insertion welding are shown in Figure 9 (applicable to no larger than 16mm), formula (5), formula (6) and formula (7): ne
Fig. 9
K, =(1. 0~1. 4)t
K,=(0.75~1.0)t
L=-K,+(0~2)|| tt||In the formula: t-
pipe wall thickness, mm:
K, - outer welding leg height, mm
K, - inner welding leg height, mm||tt ||Margin after insertion of L tube, mm,
4.6 flange coupling position deviation
(5)
(6)
(7)|| tt||4.6.1 When welding flanges, if there are no special requirements in the drawing, the center line of the bolt hole shall not coincide with the vertical and horizontal center lines of the pipe, but shall be arranged symmetrically as shown in Figure 10.
6
JB/T5000.11-1998
Figure 10
4.6.2 After flange welding, the position deviation △a of the bolt hole shall not be greater than 30 or conform to The tolerance a value specified in Table 5. Table 5 | | tt | | Screw hole diameter d | | tt | | $626 | | tt | |>26 | 3 is not greater than 30° or meets the tolerance α value specified in Table 6, Table 6
Pipe outer diameter D
648
60~89
114~159|| tt||Picturebzxz.net
Display
mm
Tolerance
S1.0
1.5
mm
public|| tt||Difference
0.6
0.8
4.7 When pipe butt welding, the weld reinforcement α and the back reinforcement 6 shall comply with the values ??specified in Table 7; When the cohesion center on the back side is out of tolerance, use a grinding wheel to grind to meet the requirements,
Table 7
Tube wall friction.
12
>12~25
Picture
shown
4.8 The appearance inspection of pipe butt welds shall comply with the provisions of Table 8. Welding spatter should be removed. 4.9 The appearance inspection of pipe fillet welds should comply with the requirements in Table 9, and welding avoidance objects should be removed. Weld reinforcement.
0. 5~1. 5
0.5~2.5
mm
Through-surface reinforcement 5
0~1. 0||tt| |25p
MPa
>31.5
1.15p
3.20 When the piping is disassembled or transferred, the separation port of the pipeline must be sealed with tape or plastic pipe to prevent any Debris comes in and is tagged. 4
Enter the assembly position number on the label.
JB/T5000.11-1998
3.21 Brackets, pipe clamps, etc. used to fix pipe fittings can be adjusted according to actual needs to determine their position. See Appendix A (standard appendix) for the pipe clamp assembly position and assembly method.
3.22 For pipelines that are disassembled and packaged for shipment, the printed mark given in the design drawing should be written on the printed paper label, put into a plastic bag, and tied to the pipe.
3.23 Flushing inspection. Industrial water pipelines have been pickled. After pre-assembly, water flushing inspection (except valves) must be carried out to ensure that the pipeline cleanliness requirements are met. See Table 3. For grease lubrication System, after the piping is completed, remove the connections at the inlets of each grease feeding device (distributor, valve, etc.). Perform grease cleaning. Do not connect until the grease that flows out is clean and has no abnormal color. For ordinary oil lubrication, the hydraulic system should be cleaned with oil. After cleaning for a period of time, take 100mL of cleaning fluid from a beaker or glass and place it in a bright place for 30 minutes. After visual inspection to confirm that there are no impurities, it is qualified. For cleanliness For oil lubrication higher than this requirement, the hydraulic system should be indicated on the drawing. Table 3
Pipe name
Equal diameter
Industrial water pipe
Road
Inlet pressure, flow rate
Choose the appropriate one The pressure and
flow rate make the liquid in the tube reach the
system flow state
decay state at the outlet
liquid column high open pipe orifice level
injection length Not less than 100
mm
Export liquid filtration requirements
Use 180~240 mesh to pass through
filter for 2 minutes, no
residue is Qualified
Prepare
Note
During the washing process, use a wooden
stick or plastic rod to hit the face section by section,
to wash away the impurities|| tt||3.24 Pipes that are completely pre-assembled according to the drawings. Adjustment pipes should be set aside according to the general assembly requirements, and the size should be determined after measurement. 4 Pipe welding technical requirements
4.1 Welders should be specially trained and qualified before they can serve as piping welding work. 4.2 When welding steel pipes, hydraulic and lubrication pipelines must be primed with tungsten arc welding or tungsten chlorine arc welding. When the pressure exceeds 21MPa, approximately 5L/min of argon and hydrogen gas should be passed inside the pipe at the same time. Other pipelines are generally made using tungsten hydrogen arc welding or tungsten hydrogen arc welding. The welding seam is welded on one side and formed on both sides. The weld must not have incomplete fusion, incomplete penetration, or slag inclusion. The shape and size of the groove for pipe butt welding are shown in Table 4. 4.3
Table 4
Pipe wall thickness!
2. 0
>2. ~20
Welding continuation symbol
Type 1 weld
Y-type weld
y
Illustration
The shape of the groove welded with coated electrodes
mm
The shape of the groove welded by gas shielded welding
5||tt| |Tube wall thickness!
>20
Welding key symbol
U-shaped weld
U
Illustration
JB/T5000.11-1998| |tt||Table 4 (End)
Bevel shape welded with coated electrodes
10*±1
05
mm
Use gas The groove shape of shielded welding
37.s*±*.5*
main 0
4.4 The misalignment tolerance e of the butt joint between the pipe and the pipe (or joint) is not greater than 0.15 , the maximum does not exceed 1.5mm, see Figure 8. Figure 8
4.5 The welding requirements for pipe and flange insertion welding are shown in Figure 9 (applicable to no larger than 16mm), formula (5), formula (6) and formula (7): ne
Fig. 9
K, =(1. 0~1. 4)t
K,=(0.75~1.0)t
L=-K,+(0~2)|| tt||In the formula: t-
pipe wall thickness, mm:
K, - outer welding leg height, mm
K, - inner welding leg height, mm||tt ||Margin after insertion of L tube, mm,
4.6 flange coupling position deviation
(5)
(6)
(7)|| tt||4.6.1 When welding flanges, if there are no special requirements in the drawing, the center line of the bolt hole shall not coincide with the vertical and horizontal center lines of the pipe, but shall be arranged symmetrically as shown in Figure 10.
6
JB/T5000.11-1998
Figure 10
4.6.2 After flange welding, the position deviation △a of the bolt hole shall not be greater than 30 or conform to The tolerance a value specified in Table 5. Table 5 | | tt | | Screw hole diameter d | | tt | | $626 | | tt | |>26 | 3 is not greater than 30° or meets the tolerance α value specified in Table 6, Table 6
Pipe outer diameter D
648
60~89
114~159|| tt||Picture
Display
mm
Tolerance
S1.0
1.5
mm
public|| tt||Difference
0.6
0.8
4.7 When pipe butt welding, the weld reinforcement α and the back reinforcement 6 shall comply with the values ??specified in Table 7; When the cohesion center on the back side is out of tolerance, use a grinding wheel to grind to meet the requirements,
Table 7
Tube wall friction.
12
>12~25
Picture
shown
4.8 The appearance inspection of pipe butt welds shall comply with the provisions of Table 8. Welding spatter should be removed. 4.9 The appearance inspection of pipe fillet welds should comply with the requirements in Table 9, and welding avoidance objects should be removed. Weld reinforcement.
0. 5~1. 5
0.5~2.5
mm
Through-surface reinforcement 5
0~1. 0||tt| |25p
MPa
>31.5
1.15p
3.20 When the piping is disassembled or transferred, the separation port of the pipeline must be sealed with tape or plastic pipe to prevent any Debris comes in and is tagged. 4
Enter the assembly position number on the label.
JB/T5000.11-1998
3.21 Brackets, pipe clamps, etc. used to fix pipe fittings can be adjusted according to actual needs to determine their position. See Appendix A (standard appendix) for the pipe clamp assembly position and assembly method.
3.22 For pipelines that are disassembled and packaged for shipment, the printed mark given in the design drawing should be written on the printed paper label, put into a plastic bag, and tied to the pipe.
3.23 Flushing inspection. Industrial water pipelines have been pickled. After pre-assembly, water flushing inspection (except valves) must be carried out to ensure that the pipeline cleanliness requirements are met. See Table 3. For grease lubrication System, after the piping is completed, remove the connections at the inlets of each grease feeding device (distributor, valve, etc.). Perform grease cleaning. Do not connect until the grease that flows out is clean and has no abnormal color. For ordinary oil lubrication, the hydraulic system should be cleaned with oil. After cleaning for a period of time, take 100mL of cleaning fluid from a beaker or glass and place it in a bright place for 30 minutes. After visual inspection to confirm that there are no impurities, it is qualified. For cleanliness For oil lubrication higher than this requirement, the hydraulic system should be indicated on the drawing. Table 3
Pipe name
Equal diameter
Industrial water pipe
Road
Inlet pressure, flow rate
Choose the appropriate one The pressure and
flow rate make the liquid in the tube reach the
system flow state
decay state at the outlet
liquid column high open pipe orifice level
injection length Not less than 100
mm
Export liquid filtration requirements
Use 180~240 mesh to pass through
filter for 2 minutes, no
residue is Qualified
Prepare
Note
During the washing process, use a wooden
stick or plastic rod to hit the face section by section,
to wash away the impurities|| tt||3.24 Pipes that are completely pre-assembled according to the drawings. Adjustment pipes should be set aside according to the general assembly requirements, and the size should be determined after measurement. 4 Pipe welding technical requirements
4.1 Welders should be specially trained and qualified before they can serve as piping welding work. 4.2 When welding steel pipes, hydraulic and lubrication pipelines must be primed with tungsten arc welding or tungsten chlorine arc welding. When the pressure exceeds 21MPa, approximately 5L/min of argon and hydrogen gas should be passed inside the pipe at the same time. Other pipelines are generally made using tungsten hydrogen arc welding or tungsten hydrogen arc welding. The welding seam is welded on one side and formed on both sides. The weld must not have incomplete fusion, incomplete penetration, or slag inclusion. The shape and size of the groove for pipe butt welding are shown in Table 4. 4.3
Table 4
Pipe wall thickness!
2. 0
>2. ~20
Welding continuation symbol
Type 1 weld
Y-type weld
y
Illustration
The shape of the groove welded with coated electrodes
mm
The shape of the groove welded by gas shielded welding
5||tt| |Tube wall thickness!
>20
Welding key symbol
U-shaped weld
U
Illustration
JB/T5000.11-1998| |tt||Table 4 (End)
Bevel shape welded with coated electrodes
10*±1
05
mm
Use gas The groove shape of shielded welding
37.s*±*.5*
main 0
4.4 The misalignment tolerance e of the butt joint between the pipe and the pipe (or joint) is not greater than 0.15 , the maximum does not exceed 1.5mm, see Figure 8. Figure 8
4.5 The welding requirements for pipe and flange insertion welding are shown in Figure 9 (applicable to no larger than 16mm), formula (5), formula (6) and formula (7): ne
Fig. 9
K, =(1. 0~1. 4)t
K,=(0.75~1.0)t
L=-K,+(0~2)|| tt||In the formula: t-
pipe wall thickness, mm:
K, - outer welding leg height, mm
K, - inner welding leg height, mm||tt ||Margin after insertion of L tube, mm,
4.6 flange coupling position deviation
(5)
(6)
(7)|| tt||4.6.1 When welding flanges, if there are no special requirements in the drawing, the center line of the bolt hole shall not coincide with the vertical and horizontal center lines of the pipe, but shall be arranged symmetrically as shown in Figure 10.
6
JB/T5000.11-1998
Figure 10
4.6.2 After flange welding, the position deviation △a of the bolt hole shall not be greater than 30 or conform to The tolerance a value specified in Table 5. Table 5 | | tt | | Screw hole diameter d | | tt | | $626 | | tt | |>26 | 3 is not greater than 30° or meets the tolerance α value specified in Table 6, Table 6
Pipe outer diameter D
648
60~89
114~159|| tt||Picture
Display
mm
Tolerance
S1.0
1.5
mm
public|| tt||Difference
0.6
0.8
4.7 When pipe butt welding, the weld reinforcement α and the back reinforcement 6 shall comply with the values ??specified in Table 7; When the cohesion center on the back side is out of tolerance, use a grinding wheel to grind to meet the requirements,
Table 7
Tube wall friction.
12
>12~25
Picture
shown
4.8 The appearance inspection of pipe butt welds shall comply with the provisions of Table 8. Welding spatter should be removed. 4.9 The appearance inspection of pipe fillet welds should comply with the requirements in Table 9, and welding avoidance objects should be removed. Weld reinforcement.
0. 5~1. 5
0.5~2.5
mm
Through-surface reinforcement 5
0~1. 0||tt| |Only those who are qualified can undertake the welding work of piping. 4.2 When welding steel pipes, hydraulic and lubrication pipelines must be primed with tungsten arc welding or tungsten chlorine arc welding. When the pressure exceeds 21MPa, approximately 5L/min of argon and hydrogen gas should be passed inside the pipe at the same time. Other pipelines are generally made using tungsten hydrogen arc welding or tungsten hydrogen arc welding. The welding seam is welded on one side and formed on both sides. The weld must not have incomplete fusion, incomplete penetration, or slag inclusion. The shape and size of the groove for pipe butt welding are shown in Table 4. 4.3
Table 4
Pipe wall thickness!
2. 0
>2. ~20
Welding continuation symbol
Type 1 weld
Y-type weld
y
Illustration
The shape of the groove welded with coated electrodes
mm
The shape of the groove welded by gas shielded welding
5||tt| |Tube wall thickness!
>20
Welding key symbol
U-shaped weld
U
Illustration
JB/T5000.11-1998| |tt||Table 4 (End)
Bevel shape welded with coated electrodes
10*±1
05
mm
Use gas The groove shape of shielded welding
37.s*±*.5*
main 0
4.4 The misalignment tolerance e of the butt joint between the pipe and the pipe (or joint) is not greater than 0.15 , the maximum does not exceed 1.5mm, see Figure 8. Figure 8
4.5 The welding requirements for pipe and flange insertion welding are shown in Figure 9 (applicable to no larger than 16mm), formula (5), formula (6) and formula (7): ne
Fig. 9
K, =(1. 0~1. 4)t
K,=(0.75~1.0)t
L=-K,+(0~2)|| tt||In the formula: t-
pipe wall thickness, mm:
K, - outer welding leg height, mm
K, - inner welding leg height, mm||tt ||Margin after insertion of L tube, mm,
4.6 flange coupling position deviation
(5)
(6)
(7)|| tt||4.6.1 When welding flanges, if there are no special requirements in the drawing, the center line of the bolt hole shall not coincide with the vertical and horizontal center lines of the pipe, but shall be arranged symmetrically as shown in Figure 10.
6
JB/T5000.11-1998
Figure 10
4.6.2 After flange welding, the position deviation △a of the bolt hole shall not be greater than 30 or conform to The tolerance a value specified in Table 5. Table 5 | | tt | | Screw hole diameter d | | tt | | $626 | | tt | |>26 | 3 is not greater than 30° or meets the tolerance α value specified in Table 6, Table 6
Pipe outer diameter D
648
60~89
114~159|| tt||Picture
Display
mm
Tolerance
S1.0
1.5
mm
public|| tt||Difference
0.6
0.8
4.7 When pipe butt welding, the weld reinforcement α and the back reinforcement 6 shall comply with the values ??specified in Table 7; When the cohesion center on the back side is out of tolerance, use a grinding wheel to grind to meet the requirements,
Table 7
Tube wall friction.
12
>12~25
Picture
shown
4.8 The appearance inspection of pipe butt welds shall comply with the requirements in Table 8. Welding spatter should be removed. 4.9 The appearance inspection of pipe fillet welds should comply with the requirements in Table 9, and welding avoidance objects should be removed. Weld reinforcement.
0. 5~1. 5
0.5~2.5
mm
Through-surface reinforcement 5
0~1. 0||tt| |Only those who are qualified can undertake the welding work of piping. 4.2 When welding steel pipes, hydraulic and lubrication pipelines must be primed with tungsten arc welding or tungsten chlorine arc welding. When the pressure exceeds 21MPa, approximately 5L/min of argon and hydrogen gas should be circulated inside the pipe at the same time. Other pipelines are generally made using tungsten hydrogen arc welding or tungsten hydrogen arc welding. The welding seam is welded on one side and formed on both sides. The weld must not have incomplete fusion, incomplete penetration, or slag inclusion. The shape and size of the groove for pipe butt welding are shown in Table 4. 4.3
Table 4
Pipe wall thickness!
2. 0
>2. ~20
Welding continuation symbol
Type 1 weld
Y-type weld
y
Illustration
The shape of the groove welded by the coated electrode
mm
The shape of the groove welded by the gas shielded welding
5||tt| |Tube wall thickness!
>20
Welding key symbol
U-shaped weld
U
Illustration
JB/T5000.11-1998| |tt||Table 4 (End)
Bevel shape for welding with coated electrodes
10*±1
05
mm
Use gas The groove shape of shielded welding
37.s*±*.5*
main 0
4.4 The misalignment tolerance e of the butt joint between the pipe and the pipe (or joint) is not greater than 0.15 , the maximum does not exceed 1.5mm, see Figure 8. Figure 8
4.5 The welding requirements for pipe and flange insertion welding are shown in Figure 9 (applicable to no larger than 16mm), formula (5), formula (6) and formula (7): ne
Fig. 9
K, =(1. 0~1. 4)t
K,=(0.75~1.0)t
L=-K,+(0~2)|| tt||In the formula: t-
pipe wall thickness, mm:
K, - outer welding leg height, mm
K, - inner welding leg height, mm||tt ||Margin after insertion of L tube, mm,
4.6 flange coupling position deviation
(5)
(6)
(7)|| tt||4.6.1 When welding flanges, if there are no special requirements in the drawing, the center line of the bolt hole shall not coincide with the vertical and horizontal center lines of the pipe, but shall be arranged symmetrically as shown in Figure 10.
6
JB/T5000.11-1998
Figure 10
4.6.2 After flange welding, the position deviation △a of the bolt hole shall not be greater than 30 or conform to The tolerance a value specified in Table 5. Table 5 | | tt | | Screw hole diameter d | | tt | | $626 | | tt | |>26 | 3 is not greater than 30° or meets the tolerance α value specified in Table 6, Table 6
Pipe outer diameter D
648
60~89
114~159|| tt||Picture
Display
mm
Tolerance
S1.0
1.5
mm
public|| tt||Difference
0.6
0.8
4.7 When pipe butt welding, the weld reinforcement α and the back reinforcement 6 shall comply with the values ??specified in Table 7; When the cohesion center on the back side is out of tolerance, use a grinding wheel to grind to meet the requirements,
Table 7
Tube wall friction.
12
>12~25
Picture
shown
4.8 The appearance inspection of pipe butt welds shall comply with the requirements in Table 8. Welding spatter should be removed. 4.9 The appearance inspection of pipe fillet welds should comply with the requirements in Table 9, and welding avoidance objects should be removed. Weld reinforcement.
0. 5~1. 5
0.5~2.5
mm
Through-surface reinforcement 5
0~1. 0||tt| |
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