Safety evaluation on flood damage at slope of oil and gas pipelines based on cloud model
Dongmei Gu · Applied Mechanics and Materials · 2012
The paper intends to introduce a comprehensive safety evaluation method for evaluating flood damage that would likely bring about to the oil and gas pipelines installed on the mountain slopes based on the cloud model.Aiming at analyzing the characteristic features of the randomness and fuzziness coexistence of the qualitative concept in the process of safety evaluation of the flood damage,we would like to come up with a comprehensive evaluation method based on the cloud model available for safety assessment of flood damage the oil and gas pipeline installed on the mountain slopes tends to be hit by.For this purpose,first of all,we have set up such an assessment system based on the cloud model theory and the corresponding set of influential factors with the point value set and point value cloud model well acknowledged.Secondly,basic data of all the factors of flood damage at the slope of oil and gas pipeline are brought into the uncertainty inference generator,with the point value drops obtained through the uncertainty inference of the cloud model.While the point value drops were put into the backward reversible cloud generator and calculated,it would be easy to get the point value cloud model with the property of Hazard Grade.And,finally,all the point value cloud models are brought into comprehensive consideration so as to get the comprehensive evaluation results of the damage.In the evaluation process,what is expected to do is to choose four slopes to implement the needed evaluation.Taking the slope length for example,we have done detailed discussions of the significance of numerical characteristics and the principle of uncertainty inference of the cloud model.And,then,we have calculated the point value cloud models of the entire secondary factors that may influence the flood damage according to the evaluation rules of above examples.Comprehensive point value cloud models of flood damage at the slope of the four pipeline sections can then be obtained by joining the weights of the factors mentioned in every gradation.And,now,comparing the comprehensive point values of the cloud drops numbers on the four slopes may help to determine the dangerous levels and the specific location of the dangerous point values.The evaluation results we have gained in this way prove to be consistent with the enterprise standard at Q/SY 1265-2010 Risk Assessment Technique of Environment and Geological Hazards in Gas Pipeline.Therefore,the suggested method can not only be thought of to be visual and dependable,but also applicable for the duty assigned to perform.