Road transport, both in quantity and variety, the transport of dangerous chemical are accounted for a considerable proportion. Because of dangerous chemical with flammable, explosive, poison, corrosive, radioactive properties, chemical the safe transport of dangerous chemical has been a road transport management focus on the target. With China’s rapid economic development, the transport of dangerous chemical demand for a rapid increase in the quality of transport and transport safety requirements have become more prominent. Therefore, the study of the transport of dangerous chemical management, and continuously improve safety awareness and management, and maintenance of healthy and stable socio-economic development, is of great realistic significance.Based on the classification of dangerous chemical, the main characteristics of dangerous chemical, as well as the road transport characteristics of the analysis, a combination of chemical enterprises transportation of dangerous chemical organizational processes the actual situation in the transport organizations in the process of carriers of dangerous chemical, the unsafe behavior, dangerous chemical transport vehicles, operational procedures, and packaging of goods by the existence of the risk of harmful factors are more detailed identification and analysis, and adopting a “pre-risk analysis” and “safety check table,” An objective analysis of the chemical enterprise all aspects of the transport of dangerous chemical existing problems, both at home and abroad from transportation of dangerous chemical advanced management experiences, the transportation of dangerous chemical management is the key practitioners, transportation of dangerous chemical and the fundamental safety management transport vehicles, transportation of dangerous chemical management is the foundation of sound management system, the establishment of information networks and rescue accident contingency plans, such as the transport of dangerous chemical safety measures and recommendations.This paper presents the “pre-risk analysis” and “safety check table”, as well as the transport of dangerous chemical safety management measures and proposals, not only will be able to objectively analyze and solve the company in transportation of dangerous chemical in the process of organizations exist, on the other dangerous chemical transport companies also have some reference.
Post about "Safety assessment"
Construction industry is one of the principle industries of the national economy. With the rapid development of national economy, the construction industry has gained amazingly quick development in recent years. There happened many accidents in the constructing and the number of the accidents in one year takes on an ascending trend. In this paper, construction enterprise safety in the construction process according to a certain safety scientific approaches, steps, relevant code, statute, criterion, etc. thus, it can provide scientific evidence for safety assessment.By synthetically using safety engineering, trend extrapolation, equivalent AR model with a higher model Grey Theory Forecast for construction safety indicators from the static and dynamic aspects, reference foreign security indicators, building structure safety indicators. The following are the main study contents.(1) Analyzed structural system by a time series model, the trend extrapolation, and grey theory. Predict the number of the serious accident and the casualty from 2008 to 2010. Discussion basic principles of time series model, and AR (p) has improved.(2) With the trend extrapolation respectively, with mortality rates of casualty, the index functions to be combined to establish the corresponding model, proposed the construction of security targets.(3) While analyzing the present situation of safety producing and safety management and introducing the experience or the safety management in the developed countries, point out imminently to establish a new system of safety management in the construction industry .establish the tree of construction of building analysis of fatal: casualty Rate. Estimated the rate of million casualty generally
Safety Assessment for Featheredged Sleeve Press-Ure Vessel Containing Pit Defects and Research for Fatigue Life of Numerical Simulation
The pressure vessel containing pit defects brings stress concentration at the place of pit because of break of geometrical figure, it makes a certain influence on the security and used life of vessel. According to above consideration, carrying out the following research about the pressure vessel containing pit defects.Firstly, choosing pits in the different situation and different dimension, owing to existing pits, according to request of GB/T19624-2004 Safety Assessment for Pressure Vessels Containing Defects, need carry through safety assessment for the pits which satisfy G0>0.1.The results indicate that researchful pits are in the allowable range of safety assessment.Seccondly, fatigue analysis is based on the statics analysis, so, making use of finite element software MSC.Patran to carry through statics analysis for the vessels which contain different kind of pits, and making ues of Excel to carry through multianalysis, gainedingaregressive formulas. The results indicate that along with the increase of Z/δn, maximal principal stress and stress concentration factor are power increases and along with the increase of X/（?）n , maximal principal stress and stress concentration factor are power decreases.Thirdly, according to the statics analysis, making use of fatigue design curve in JB 4732 and fatigue analysis software MSC.Fatigue to carry through fatigue life analysis for the vessels which contain different kind of pits, and making ues of Excel to carry through multianalysis, gaineding aregressive formulas. The results indicate that along with theincrease of Z/δn, design fatigue life and MSC fatigue life are power decreases and along with the increase of X/（?） , design fatigue life and MSC fatigue life are power increases.
The new generation pipeline steel of the high-Nb X80 is used increasingly because of the high toughness and good weldability. At the same time, as a typical pipe welded structure, the welded joints are the weakness location.This is mainly because there inevitable welding defects,residual and inhomogeneous microstructures and poor mechanical in the welded joint zone.With the development of the engineering practice and the fracture mechanics, people don’t required that the structure should not contain any welding defects, gradually use the principle of the “fitness for purpose” to assess the influence of the welding defects on the structures. This movement not only take into account of the economic cost of the structure, but also provide the theoretical basis for the safe performance of the structure.In this study, through the Crack Tip Open Displacement (CTOD) tests conducted under zero of 10 degree according to the requirements of the standard of BS7448,in which a strandard TPB (three point bending) shape was accepted,the values of CTOD were obtained for the circumferential weld joint and the axial weld joint in the different welding process.The different crack direction is studied for the circumferential weld joint.One is the embedded flaw,the other is the surface.Based on the tensile test results of base metal and weld metal including Hobart and JC-30,the failure assessment curves of respective levels were created.The standard BS7910 was applied to assessment for circumferential weld joint for the China-made high-Nb X80 pipeline steel tube with embedded flaw and surface flaw at the weld toe in a given crack size and load. The results of the assessment showed that all assessment points are located within the failure lines of analysis.The study provide a reference for the application of the high-Nb X80 in China
Oil rigs derrick is the important component part of petroleum industry, it is a large scale load composition, is important to oil field production. Because of using many years, the different defects of strut and connect place influence directly the safety of drilling operation. At the moment, the general way of the safety assessment to oil derrick is that, testing derricks stress、displacement and structure dynamic characteristic, basing on testing data, making sure the bearing capacity of derricks by linear extrapolation. But only limited dangerous place can be tested in derrick load experiment, testing load is much lower than design load, so it is difficult to get comprehensive and reasonable assessment result. So, the study of oil derrick composition bearing capacity by limit element analysis, raising bearing capacity testing level and safety assessment level of oil derricks, that has the important theory significance and use value without doubt.The paper mainly carries on the safety assessment to the load capacity for variable cross-section leg derricks, firs taking in the using JJ225/43-K variable cross-section leg derrick as the example, carries on the statical analysis under the biggest load operating, makes sure the derrick’s stress and displacement under the big hook load operating; Then the paper introduces the scene derrick test technique, and carries on the appearance examination、the static load experiment、dynamic load test and computer simulation, as the foundation for as follows safety assessment. Finally, the paper elaborates the equivalent processing method of derrick initial imperfection such as initial curvature、section corrosion, studies the safety assessment theory of oil derrick bearing capacity, and carries on the bearing capacity analysis and the safety appraisal to the variable cross-section leg derrick after equivalent processing.The paper unified project actual, carries on the bearing capacity analysis and the safety assessment to the variable cross-section leg derrick, uses the way which finite element analysis and the scene test, provides the reference to the using derrick and new derrick bearing capacity and reliable appraisal, will has the great significance to make the safety assessment system theory careful and thorough.
Rig system’s safety operation is very important in drilling process. Derrick and substructure is the key parts, which safety property is important to production safety of whole derrick system, that is integrated the assessment derrick system safety operation project. Rigs derrick and substructure may have different degree defects and defacements because of disassembly and assembly、conveying、over load and corrosion in production process, the defects and defacements make bearing capacity of derrick and substructure lower than design degree, that makes safety load unknown and production safety hidden trouble. For making sure rig safety operation in drilling process, it has important meaning to assessment bearing capacity of rigs derrick and substructure.The paper first simplify derrick member as the spatial beam element, in view of the ZJ15DB5 rigs derrick and the substructure, carries on the static analysis under the drilling operating using the ANSYS finite element analysis, obtains the derrick and substructure’s stress and displacement distributes under this operating, determinants obtained stress whether in its rated load scope, structure whether to satisfy the intensity request. Along with it, the paper carries on the static analysis to the ZJ15DB5 rigs derrick and substructure under the lift operating, obtains derrick and substructure’s stress、displacement change in lift process, as well as the lift angle when presents the biggest stress and displacement. Then, the paper studies the rigs derrick test data gathering and the analysis, introduces the primary coverage of derrick test technology and derrick test date gathering and analysis, and carries on the test data gathering and analysis to using ZJ15DB5 rigs derrick. Finally, it studies the revision method of derrick initial flaw and safety assessment theory, and carries on the safety assessment to the ZJ15DB5 rigs derrick.The paper evaluates the bearing capacity of the ZJ15DB5 rigs derrick and substructure, using the method which unify the structure finite element analysis and the scene test, determines it whether can be used safely, provides the reference to the using derrick and new derrick bearing capacity and reliable appraisal, will has the great significance to make the safety assessment system theory careful and thorough.
Now, pressure piping is extensively used in petrochemical、metallurgy、electric power、medicine and so on. It is also developing with large-scale、diversification、and complication. But how to deal with the pressure pipings with defects is an important question in project area.Penstock is a kind of large pressure piping and is an important constitute of the building of power plant with water-transportation. It takes on bigger inner hydraulic pressure, the weight of itself and the watery weight. During the manufacture and fixing of penstock, it is easily to get welding defects and can be repaired by repair welding, but some shallow defects are usually neglected and don’t bring the recognition. Where the defects are, the size of received section could be changed. It results in bigger stress concentration, mostly reduces the bearing power of the welded joint and has an important impact on the static strength, the fatigue strength, the brittle fracture and the resistance to stress erode cracking. So it is necessary to finish the mechanics analysis and safety assessment of the penstocks with welding defects.Undercut and unfitness are common welding defects in the producing and fixing of penstocks. They are hard to be analyzed by using general methods. In this paper, based on the fact of hydroelectric power station, three-dimensional finite element models of undercut and unfitness are built. And the finite element software ANSYS 9.0 would be used to have a stress account and analysis on the undercut and unfitness with different depth, sharpness, and place. Secondly the affection of the defects in different conditions at the welded joint with stress concentration is discussed.By using CVDA-84 and “Safety assessment for in-service pressure vessels containing defects”, this paper makes safety assessment about the penstocks with longitudinal undercut of different depth and works out the largest depth of undercut allowed. It has large significance for engineering.
The common characteristics of port district project is high investment, high.risk, therefore risk assessments should be adopted to such water industry to find, analysis and forecast the dangerous that may have and determine the degree of harm. According to the risk assessment, we can produce reasonable and feasible countermeasures for the safety to guide the monitoring of dangerous source and accident prevention, so as to be the lowest accident rate, the least loss and optimal investment returns of safety investment.In order to adapt and promote the development of Wenzhou and its peripheral economic, the Wenzhou Municipal party committee and the municipal government implement the developmental strategy of “One Port Three Cities”. The ZhuangYuanao port district construction project is one of the cores of this strategy. The comprehensive implementation of this project will lay a solid foundation for Comprehensive development of the outside harbor of Oujiang Estuary, the strategy exchange from estuary port to the offshore deepwater port, the realizing of development by leaps and bounds and identify the main coastal hub port status of Wenzhou port. This paper will access the dangerous of Zhuangyuanao port district in Wenzhou port to find the element of risk and finally provide corresponding measures and countermeasures according to the element of risk.The main work of this paper can be described as follows:(1) Analyze the risk factors water industry of Zhuangyuan’ao port district in Wenzhou port by the combination of simulation experiments and theoretical analysis. During the analysis of the impact of water industry to the channel, the channel and berths scale have been analysed by the test data of large,scale simulator. By using historical statistics and practical work experience, the impact of the water industry to the anchorage, marine transport, anti.typhoon and other aspects have been qualitative analysed.(2) Analyze the dangerous of water industry by using fuzzy comprehensive evaluation. Risk assessment is a very complex work, including a lot of uncertain factors, it is difficult to use quantitative methods to calculate accurately the degree of risk. For this kind of problem solving, multi.level, multi.factor of fuzzy comprehensive evaluation method is a more mature and effective method. Using this method, we can get accurate and credible results, so that prevention effort can be targeted or pre.cut of the source of danger, which mainly depend on the determination of evaluation index, weight and membership functions.(3) Propose measures based on the analysis of the result of risk factors and security risk. According to previous research results, corresponding countermeasures have been provided in the regards of the formulation and compliance with regulations, safety measures of entering port channel and surrounding navigable environment, Maintenance of ship navigation safety measures and responses of inclement weather of quarantine and anti-storm anchorage, pilot and tide-waiting anchorage, navigational signs, piers and surrounding waters and so on.
With the petrochemical industry developed rapidly, its production scale isincreasing to the high-temperature, high pressure and large-scale development, andthere is a variety of flammable, explosive and toxic substances produced in theproduction process. In recent years, fire, explosion, the proliferation of poison gas,such as major accidents continue to occur at home and abroad, causing hugecasualties and property losses and adverse social impact, and producing anincreasingly grim situation, the security issues in the chemical industry of oilproduction are particularly important. As a result, there are important theoretical valueand practical significance that safety assessment for the petrochemical enterprisestorage places and the analysis of the consequences of major accidents, effectivescientific prediction, prevention, control the occurrence of major accidents, to reduceor avoid a disaster of such incidents, to ensure that the oil storage safety Operation toprotect life and property of the staff, to strengthen safety in production ofpetrochemical enterprise management, enterprise security and sustainable productionand stable development.The internal and external security assessment of the status quo is discussedthrough a large number of investigations and studies in this paper, as well as thedevelopment of the safety evaluation of the basic concepts and storage tank area ofsafety assessment procedures. The selection principle of the evaluation methods is putforward for safety evaluation of storage tank area. In this paper, take UrumqiPetrochemical Company oil storage tank area for instance, a safety evaluation systemis established. The first, according to these principles and the pre-production featuresof storage tank area, the methods of first-risk analysis are used to analyse the dangercategory, arise conditions, accident consequences those existed in system; Secondly,to adopt the method of fire and explosion index of Dow chemical company toevaluate the risk analysis of the storage tank area, to quantify the potential fire,explosion and the expected loss of the reaction accident; Finally, it can be analogcalculated for the accident consequences of the storage tank area with adopting thesimulation of the accident consequences and prediction. The rule and feature of accident can be found out with it, in order to predict the severity of the accidentsconsequences. Accroding to the current safety management of the oil storage tank area,A reasonable and practical safety measures can be put forward Put forward to providstrong support for the day-to-day safety management, safety regulations and operatinginstructions’improving, the emergency rescue in the event of a storage area.
Shunting accident was Railway Train Station section of multiple traffic accidents, which resulted in damage to equipment, property damage, interfere with the normal railway transport production order, and in some cases, shunting endanger the safety of personnel, greater harm. In recent years, the Shenyang Railway Bureau shunting accident rate has been high, was widespread, multiple, repeated development, shunting incident has become its most important types of traffic accidents.To do a good job in Shenyang Railway Bureau shunting accident prevention and control, this article in order to Shenyang Railway Bureau, 2005-2007 Operation of the system for all shunting accident case basis, into the Shenyang Railway offices and some bus services stand above the grass-roots research The results, with a gray system theory approach to the Shenyang Railway Bureau shunting accident to predict the development of the situation, in order to increase emphasis on vehicle safety management and provide a basis for decision-making; security through the establishment of FTA model, reversed the car accident occurred in an in-depth analysis of the reasons , Shunting off to find the main reason for the accident, come to the general laws; At the same time, the Shenyang Railway Bureau car points above the current shunting accident prevention and control system for comprehensive evaluation to identify the shortcomings, suggest improvements. Finally, from the environment, personnel, equipment, management, operations shunting the major factors of production, in a comprehensive analysis on the basis of the system from the perspective of the need to further strengthen or improve the shunting accident prevention and control measures.