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Safety control method for pressure pipeline having incomplete welding flaw and bearing internal pressure, bending moment and torsion complex loads
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A technology for complex loads and pressure pipelines, applied in the field of safety control of pressure pipelines with incomplete penetration defects, to achieve high calculation accuracy, ensure safe operation, and ensure safety
Active Publication Date: 2012-07-11
ZHEJIANG UNIV
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[0004] The technical problem to be solved by the present invention is to provide a safety assessment method for pressure pipelines with incomplete penetration defects subjected to internal bending and torsion complex loads; using this assessment method can prevent the occurrence of sudden damage accidents of pressure pipelines, thereby ensuring the safety of pressure pipelines safe use of
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Embodiment 1
[0082] Example 1. There is a pressure pipeline containing a non-penetration defect. Its design parameters are: the material is 20# steel (σ s =365MPa, σ b =507MPa), the specification is Φ89×4(R 0 =44.5mm, R i = 40.5mm, wall thickness T = 4mm), after non-destructive testing, a non-penetration defect 1 was found, the size of the in-penetration defect 1 is: the actual maximum circumferential length l = 128mm, the actual deepest depth h = 2.1 mm, width B=2mm. In actual work, the pressure P=3.2MPa.
[0083] The evaluation process is as follows:
[0084] 1) To determine whether this method is applicable:
[0085] ①Whether the pipe material is 20# steel: Yes;
[0086] ②Pipediameter ratio k=R 0 / R i =44.5 / 40.5=1.1, satisfying 1.1≤k≤1.2;
[0087] Conclusion: the above two conditions are met at the same time, so go to step 2);
[0088] 2) Obtain the regularized parameters of incomplete penetration defects:
[0089] Regularized circumferential length L of incomplete penetrat...
Embodiment 2
[0122] Embodiment 2, a pressure pipeline containing incomplete penetration defects, the pipeline material is 20# steel (σ s =365MPa, σ b =507MPa), the pipe specification is Φ57×3.5(R 0 =28.5mm, R i =25mm, wall thickness T=3.5mm), after non-destructive testing, a non-penetration defect 1 was found, the size of the non-penetration defect 1 is: the actual maximum circumferential length l = 141mm, the actual deepest depth h = 1.6 mm, width B=2mm. In actual work, the pressure P=6.3MPa.
[0123] The evaluation process is as follows:
[0124] 1) To determine whether this method is applicable:
[0125] ①Whether the pipe material is 20# steel: Yes;
[0126] ②Pipediameter ratio k=R 0 / R i =28.5 / 25=1.14, satisfying 1.1≤k≤1.2;
[0127] Conclusion: the above two conditions are met at the same time, so go to step 2);
[0128] 2) Obtain the regularized parameters of incomplete penetration defects:
[0129] Regularized circumferential length L of incomplete penetration defects: ...
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Abstract
The invention discloses a safety control method a pressure pipeline having an incomplete welding flaw and bearing internal pressure, bending moment and torsion complex loads, which comprises the following steps: acquiring the position, the shape and the size of each incomplete welding flaw in a pipeline to be tested; limiting a maximum value bmax of the relative depth b of the incomplete welding flaw which is allowed at circumferential lengths a relative to the different incomplete welding flaws; specifically detecting each incomplete welding flaw, and judging whether the pressure pipeline issafe or not according to a corresponding computing formula; when the pressure pipeline is safe, keeping a control valve of the pressure pipeline in an opening state; and if the pressure pipeline is not safe, closing the valve. The safety control method can prevent a sudden malicious event of the pressure pipeline from happening so as to ensure safe use of the pressure pipeline.
Description
technical field [0001] The invention relates to a safety monitoring method for a pressure pipeline under complex loads of internal pressure, bending moment and torque, in particular to a safety control method for a pressure pipeline with incomplete penetration defects. Background technique [0002] The pressure pipeline is a special pressure-bearing equipment that transports high-temperature, high-pressure, flammable, explosive, highly toxic, highly corrosive or radioactive materials. It is widely used in petrochemical, energy, smelting, environmental protection and other national economic construction. In the field, the reliability of its work is crucial to the safety of the entire production and living system. Due to technical reasons, there are a large number of incomplete penetration defects in the joint welds of pressure pipes, which weakens its actual stress-bearing area and reduces its bearing capacity, posing a serious threat to the safe use of pressure pipes. There...
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