Method and system for evaluating safety of oil storage tank bottom plate with corrosion defect

A technology for safety evaluation and oil storage tanks, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as inability to evaluate safety

Inactive Publication Date: 2012-08-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the corrosion depth of the bottom plate of the oil storage tank exceed

Method used

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  • Method and system for evaluating safety of oil storage tank bottom plate with corrosion defect
  • Method and system for evaluating safety of oil storage tank bottom plate with corrosion defect
  • Method and system for evaluating safety of oil storage tank bottom plate with corrosion defect

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Embodiment Construction

[0073] In order to understand the present invention in depth, the present invention will be described in detail below in conjunction with specific examples.

[0074] The method for safety evaluation of the bottom plate of an oil storage tank with corrosion defects provided by the present invention comprises the following steps:

[0075] Step 1: Determine the parameters E, t, μ, K, ρ, L 0 , l, φ, σ s , n F , FCA, t 0 , Z, R, δ 1 ,in,

[0076] E-modulus of elasticity of the bottom plate material;

[0077] t - the average thickness of the edge plate;

[0078] μ - Poisson's ratio of the floor material;

[0079] K-elastic foundation coefficient, generally 400kN / m 2 ;

[0080] ρ - storage liquid density;

[0081] L 0 - the hydraulic height acting on the base plate;

[0082] l-bending width of edge plate;

[0083] φ-weld coefficient;

[0084] σ s - the yield stress of the plate material;

[0085] no F - Design safety factor of medium-width slab;

[0086] FCA-the cor...

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Abstract

The invention discloses a method and a system for evaluating the safety of an oil storage tank bottom plate with a corrosion defect and belongs to the technical field of evaluation on in-service defective containers in petroleum and petrifaction industry. The method comprises the following steps of: determining parameters E, t, mu, K, Rho, L0, 1, Phi, sigma s, nF, FCA, t0, Z, R and theta 1; calculating parameters D, p, [sigma], Rz, beta 1 and Rsf; calculating N, NL, M0 and ML; and when the square of N/NL is less than or equal to 0.44, determining that the defect of a center plate can be accepted, and when the sum of the square of N/NL and the square of Mo/ML is less than or equal to 0.44, determining that the defect of an edge plate can be accepted. The invention provides the method and the system for evaluating the safety in order to deal with the condition that the corrosion depth of the oil storage tank bottom plate exceeds the defect standard specified as SY/T 5921-2000, and suggestions about safety running of an oil storage tank can be provided.

Description

technical field [0001] The invention relates to the technical field of safety evaluation of in-service defective containers in the petroleum and petrochemical industry, in particular to a method and system for safety evaluation of the bottom plate of an oil storage tank with corrosion defects. Background technique [0002] During the operation of the oil storage tank, the surface of the bottom plate directly contacts the sewage or sedimentation water containing impurities, which accelerates the corrosion of the bottom plate surface and makes corrosion the main reason for the failure of the bottom plate of the oil storage tank. If the ultimate load of the bottom plate with corrosion defects is not calculated in time, these corrosion defects on the bottom plate are likely to cause the bottom plate to be damaged due to insufficient remaining strength. Li Chunshu et al. proposed the characteristic parameters describing the corrosion state of the storage tank bottom plate and the...

Claims

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Application Information

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IPC IPC(8): G01N3/56G06F19/00
Inventor 董保胜罗金恒赵新伟陈宏达
Owner BC P INC CHINA NAT PETROLEUM CORP
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