Method for risk assessment and safety detection and evaluation of atmospheric pressure storage tanks

Abstract

The invention discloses a method for risk assessment and safety detection and evaluation of atmospheric pressure storage tanks, and the method comprises the following steps of S1, screening of storagetanks; S2, risk ranking: ranking all storage tanks according to the RBI risk assessment results, determining key storage tanks that require key detection and evaluation, and preliminarily determiningcorresponding detection methods for key storage tanks based on the assessment results and field condition limitations; S3, detection of the key storage tanks; and S4, solving of storage tank problems: using finite element analysis to determine the anti-settling stability and fatigue life prediction of the key storage tanks. The method firstly carries out RBI risk assessment of the storage tanks,sorts all storage tanks to determine the key storage tanks that require key detection and evaluation, inspects and evaluates the key storage tanks by using the method of acoustic emission detection ortank opening inspection according to the characteristics of the key storage tanks, and determines the anti-settling stability of the key storage tanks by finite element analysis.

Description

technical field [0001] The invention relates to the technical field of equipment detection, in particular to risk assessment and safety detection and evaluation methods for atmospheric storage tanks. Background technique [0002] Atmospheric storage tanks have the advantages of low construction cost and large reserves, and are mostly used to store raw materials, intermediates and finished products. Atmospheric pressure storage tanks are widely used in areas with developed petrochemical industries. Therefore, ensuring the safety of a large number of atmospheric pressure storage tanks, reducing the occurrence of accidents such as leakage and rupture, and reducing environmental pollution are the common demands of the government, enterprises and all citizens. [0003] The distribution of existing atmospheric pressure storage tanks has the following disadvantages: 1. Most of them are located in the coastal and river areas. Because the chemical production process needs to use a la...

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Problems solved by technology

[0003] The distribution of existing atmospheric pressure storage tanks has the following disadvantages: 1. Most of them are located in the coastal and river areas. Because the chemical production process needs to use a large amount of water, many petrochemical enterprises are mostly located in the coastal and river areas. Once the storage tanks in these enterprises In an emergency, it is very easy to cause leakage of stored materials, which may pollute the groundwater in the lightest cases, and cause major ecological disasters if the materials enter the sea in severe cases

2. Coastal areas are greatly affected by typhoons, and strong winds and heavy rains have a greater impact on the structural stability and foundation stability of storage tanks

The typhoon will cause the storage tank to be flattened and ruptured. Strong typhoons are often accompanied by heavy rainfall. The rise of the groundwater level will cause the soil to liquefy, and the bearing capacity of the storage tank foundation will decrease, which will easily cause damage to the bottom of the tank.

[0004] The existing atmospheric storage tank itself also has some disadvantages: 1. The tank bottom and the tank wall are connected by fillet welds, and the structural height is discontinuous, and it is easy to withstand excessive shear force and bending moment in the excessive settlement of the foundation, causing the connection part to rupture; As the liquid level rises and falls, the tank bottom and tank wall joints are subjected to excessive alternating fatigue stress, which is prone to rupture after long-term use

2. Compared with pressure vessels, attention is not paid enough to atmospheric pressure tanks. It is often believed that atmospheric pressure storage tanks are not under pressure and the force they are subjected to is very small, so there will definitely be no danger. In fact, in order to make full use of materials, design often Considering that the stress on the wall plate of the atmospheric storage tank is close to the allowable stress of the material, the complexity of bearing the load is even more complicated than that of the pressure vessel

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