Safe evaluating method for pressure vessel after short-time firing

A technology of pressure vessels and evaluation methods, applied in the field of safety evaluation of pressure vessels, can solve problems such as safety evaluation of pressure vessels without fire

Inactive Publication Date: 2011-05-11
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] In addition, in terms of patents, relevant patents include the safety prediction method of pressure vessel fatigue life, the method of improving the r...

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  • Safe evaluating method for pressure vessel after short-time firing
  • Safe evaluating method for pressure vessel after short-time firing
  • Safe evaluating method for pressure vessel after short-time firing

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example 2

[0198] Engineering example 2: Still taking the above-mentioned pressure vessel as an example, the maximum temperature experienced by the pressure vessel in a fire is between 600 and 800°C. Therefore, in terms of the distribution of heat exposure areas, this vessel is located in the V-level and VI-level range. According to the evaluation criteria, it is evaluated at level 3. Severe distortion or denting of fire-exposed equipment was first observed, and hardness testing indicated soft material. The material in the parts is further taken out to make a test piece, and the impact test is done, and the test result is obviously lower than the strength requirement. In addition, the equipment cannot be normalized and heat treated, only parts of the affected area can be replaced. Finally for the replacement of the affected part, radiographs of all new welds meet the requirements. Welding repairs shall comply with all code and engineering requirements. Then, according to the reliabili...

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Abstract

The invention discloses a safe evaluating method for a pressure vessel after short-time firing, which comprises the steps as follows: detecting the ambient temperature of the fired pressure vessel; deciding to perform primary evaluation or secondary evaluation according to the temperature, wherein the primary evaluation is to detect the leak tightness of the equipment after the completeness of the coating and the fire-resistant coating of the pressure vessel is detected; and the secondary evaluation is to detect the deformation size of the pressure vessel; testing tensile strength and determining the highest permitted service pressure; judging creep deformation area, determining creep deformation service life or detecting the leak tightness of the pressure vessel; or performing a three-stage evaluation after the secondary evaluation to carry out on-site metallographic analysis, mechanical property actual measurement and rigidity testing after stress analysis. The method provided by the invention can analyze safety of pressure vessel equipment after short time firing, so as to avoid unnecessary maintenance and guarantee fee, further improve the reasonableness of the making of high-temperature production equipment maintenance plan.

Description

technical field [0001] The invention relates to a safety evaluation method for a pressure vessel, in particular to a safety evaluation method for a pressure vessel after being exposed to fire for a short time. Background technique [0002] In the petrochemical industry, pressure vessels occupy a considerable weight. With the development of science and technology and industrial production, the requirements for these equipment are getting higher and higher, especially because most of the petrochemical production equipment operates in harsh environments, facing high temperature, high pressure, low temperature, high vacuum, corrosion, poisonous, Inflammable and explosive threats, it is particularly important to conduct a systematic safety assessment of the equipment. At present, there are many documents on the evaluation of equipment in different operating environments at home and abroad. For example, the safety assessment method for structural damage of chemical high-temperat...

Claims

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Application Information

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IPC IPC(8): G01M3/00G01N3/00G01N25/02G06F19/00
Inventor 轩福贞杜黄立刘长虹涂善东
Owner EAST CHINA UNIV OF SCI & TECH
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