This paper analyzes and studies the current situation of subcontractor safety management, the difficulties and weaknesses of subcontractor management in refining and chemical engineering projects. According to the characteristics of the refinery projects and combined with the current situation of social resources and human resources of subcontractors, some measures for the management of refining and chemical subcontractors are proposed, aiming to improve the safety management level of subcontractors of refining and chemical engineering projects.

Safety management during the construction period of hazardous chemicals enterprises is the premise and foundation of production and operation. Combining with the practice of safety management during the construction period of hazardous chemicals, the qualification of contractors, the quality of management personnel, safe and orderly construction, project management organization, education and training, safety inspection, wages of migrant workers and other contents are considered and explored, and typical problems existing in safety management during the construction process are found and analyzed. This may improve the safety management system and ensure the normal production and operation.

This paper expounds the main characteristics of common corridor in the chemical industry park and analyzes the typical problems during the safe operation of the common corridor. It proposes key countermeasures from such aspects as management system, planning access, production and operation, emergency management and so forth. This offers insights for enhancing safety management practices in common corridor operations.

This paper elaborates on the key points of safety risk management for site traffic and working around mobile equipment in petrochemical engineering projects from two aspects: safety risk identification and safety risk control measures. Taking a wholly foreign-owned petrochemical engineering project in China as an example, this paper summaries the safety management practice and experience of site traffic and working around mobile equipment. Finally, the paper discusses the future prospects of traffic and human-machine interface safety management in domestic petrochemical engineering projects.

As a high-risk industry, offshore oil development requires the establishment of a quantitative assessment system for safety governance. Taking China Oilfield Services Limited (COSL) as the research subject, this study innovatively proposes a "dual-dimensional safety indicator system" (generic indicators + specific indicators) based on Heinrich's Law and the Swiss Cheese Model theoretical framework. It has developed a risk early-warning system covering the entire operational lifecycle. By introducing 12 quantitative indicators such as Crew Stability Rate and Risk Conversion Efficiency Coefficient, the risk perception accuracy has been improved by 47%. Empirical studies demonstrate that this system achieved a 62% reduction in recurring hazard incidence and maintained the OSHA recordable incident rate 35% below the industry average, establishing a closed-loop management paradigm of "indicator-driven process, cultural permeation, and behavioral correction". The research outcomes provide methodological reference for safety governance in highly complex industrial scenarios.

In order to effectively address the risk management challenges in preventing leakage accidents in the long-distance pipelines of Daniudi Gas Field, this study proposes a dynamic risk assessment method based on Bayesian Network (BN). First, risk factors in the leakage accident process of gas field pipelines were identified and the consequences of leakage evolution were visualized using the Event Sequence Diagram method. Subsequently, a Dynamic Bayesian Network (DBN) model was developed to characterize the pipeline leakage failure evolution. By incorporating fuzzy set theory to quantify the basic event probabilities of uncertain factors, the model dynamically captured the risk evolution characteristics of pipeline leakage accidents. Finally, dynamic probability analysis of accidents was employed to evaluate the risk probability of pipeline leakage in the gas field. The results indicate that this method can efficiently identify the critical risk factors of leakage accidents in Daniudi Gas Field pipelines and has realized the dynamic risk assessment of long-distance pipelines in the gas field.

According to the operation condition of nitrogen-blanketed wastewater tank in petrochemical wastewater plant, the working conditions can be simplified into four types, namely nitrogen supplement working condition, pressure boost working condition, exhaust working condition and pressure reduction working condition in gas phase space. The operating pressure range is given corresponding to nitrogen supplement working condition and exhaust working condition, and the calculation formula of the duration of four working conditions is proposed. The calculation method of organic matter concentration in gas phase is also given. Taking a 10,000m3 storage tank as an example, the operating pressure is maintained in the range of 0.1kPa~ 0.9kPa. Under the most unfavorable condition (full tank), the calculation results of the duration of the four working conditions are given, among which the exhaust working condition takes the shortest time. An optimization scheme is proposed to solve the problem of frequent start and stop of induced draft fan in exhaust working condition.

Dimethyl sulfoxide is widely used as an efficient organic solvent in the market. Its production process is relatively complex with a narrow range of parameter control, toxic and flammable raw materials, and high risks during the operation of the device, especially in the evaporative desalination process. Production safety accidents have occurred in many domestic devices. This paper analyzes the causes based on accident cases and puts forward some suggestions and measures.

The inclination of the outlet header pipe joint of a certain ultra supercritical boiler resulted in significant deformation of the welded junction after the pipe joint was connected to the serpentine tube group. Considering the long-term service of the furnace tube, an analysis was conducted on the deformation of the welded junction. The results show that there are no defects at the welded junction, the chemical composition is normal, the metallographic twin morphology is complete and clear, and no abnormal structure is found; When the working pressure is not higher than 3.9MPa and the working temperature is not higher than 563 ℃, the structure at the welding junction has passed the strength check and does not affect the normal operation of the pipe joint and the serpentine tube group.

In order to reduce the emissions of volatile organic compounds (VOCs) from storage tanks, the VOCs emissions under different tank types and structures and different environmental parameters were calculated based on the review of the emission mechanism and characteristics of storage tanks, using the formula calculation method. The emission reduction strategies were sorted out from both source reduction and process control aspects. The results show that the emission volume of the floating roof tank is much smaller than that of the fixed roof tank. The emission reduction effect of floating roof tank using double-layer plate floating plates and welded floating plates is better, and the double sealing method of liquid inlay and edge scraper has the best effect. It is suggested that a crude oil stabilizing device be added first to reduce the saturated vapor pressure of crude oil, and a new type of fully compensated elastic sealing structure be adopted to reduce breathing emissions. Finally, the VOCs can be recycled through a combined process of one-stage condensation and membrane separation.

Through the investigation of an accident in which a concentrated sulfuric acid storage tank exploded during hot work in an enterprise, this paper introduces the characteristics of gas explosion traces, heating traces of steel oxide layer in the storage tank, and trace characteristics of steel oxide layer caused by explosion impact waveform during the identification process of the explosion accident. Combined with video reconnaissance analysis and spatial analysis technology, the cause of the sulfuric acid storage tank explosion accident is identified. This provides experience reference for future safety prevention and explosion accident investigation of iron sulfuric acid storage tanks.

There are major operational safety problems in the high-pressure air injection huff and puff process, which can easily lead to explosion accidents in injection or production wells. Taking the wellbore explosion accident during the air injection huff and puff process in a certain oilfield as an example and combining with the accident process and the situation of on-site investigation, this paper determined the process risks from such aspects as explosion type, explosion limit, safe oxygen content, and ignition source and then gave the proposal of explosion-proof measures. The results show that the explosion energy is between 61.5 and 205.2 MJ and the chemical explosion energy is consistent with the actual explosion energy. Under normal temperature and pressure, the explosion limit of flammable gas in the wellbore is 3.94% - 13.65%, and the critical oxygen content is 10.36%. It is recommended to reduce the probability of explosion accidents during the high-pressure gas injection process in terms of continuous gas injection of multiple compressors, design of packers, control of the oxygen content of the oxygen-reducing air and injection of inert protective gas.

PID control systems are widely used in various process industries. This paper briefly presents the basic principles and parameter tuning process of PID control systems. Then, based on PIPENET software, the process of determining parameters such as proportional coefficient and integral coefficient in the constant pressure control system of simple pipelines was studied. And the basic values of each parameter were determined, which provided reference for subsequent control system debugging. The influence of various parameters of the pipeline was studied, providing reference for the PID parameter tuning of complex fluid pipeline network systems in the future.

This paper focuses on the effectiveness and improvement plan of emergency response strategies for chemical leakage accidents in the petrochemical industry. Hazardous chemical leakage incidents pose multifaceted impacts on the environment, human health, and socioeconomic systems.? The focus is on the significance and existing issues of emergency response strategies, emphasizing the importance of comprehensive emergency response plans. The paper also presents specific recommendations including enhancing inter-departmental cooperation, increasing technological investment and improving legal regulations. Finally, it discusses the limitations of this study and potential future research directions.

A crude oil pipeline of Northwest Oilfield Company has been in continuous operation for nearly 15 years, during which pipeline pigging has not been carried out. In order to determine the optimal pigging cycle of the pipeline, the internal detection technology was adopted to obtain the deformation and corrosion data of the pipeline after the first pigging. And the optimal pigging cycle was finally determined from the perspectives of critical corrosion depth, ultimate bearing capacity and operation economy. The results show that the remaining life of the pipeline is 7.12 years and 5.02 years respectively by calculations from the corrosion progress formula and finite element analysis method. In addition, from the perspective of pipeline operation economy, pigging operation after 5 years of pipeline operation can reduce the cost by about 250000 yuan. Therefore, the pigging cycle of the crude oil pipeline is finally determined to be 5 years. The determination of pigging cycle can provide a scientific basis for the later maintenance of the long-distance crude oil pipeline.

The Middle East is renowned for its abundant oil resources; however, some oilfields in the region contain hazardous gases such as hydrogen sulfide (H2S), which poses serious safety hazards to the extraction and production process. This paper conducts an in-depth analysis of the hazards associated with hydrogen sulfide-containing crude oil in a specific Middle East oilfield and proposes corresponding safety protective measures to ensure the safety of oilfield personnel and the environment. Through a detailed study on the properties and hazards of hydrogen sulfide, as well as the existing safety protection measures, this research has drawn practically significant conclusions which may provide guidance and recommendations for oilfield management personnel and operational staff.

Activated carbon (AC), known for its large specific surface area and well-developed internal channels, is widely used in odor removal, smoke gas purification and water purification. However, its hydrophilicity can lead to rapid adsorption saturation, impeding organic adsorption and shortening its lifespan. In this study, super hydrophobic AC was prepared through surface roughening pre-treatment and propyl trimethoxysilane grafting, and applied in the M-003 adsorption tank of Yangzi Petrochemical Olefin Plant. The results showed that the super hydrophobic AC significantly outperformed the original AC in adsorbing VOCS from the plant's wastewater and exhaust gases. Additionally, the use of super hydrophobic adsorbents can reduce operational costs, meet environmental emission standards, enhance the company's environmental image and save environmental investment costs with an operational cost savings rate exceeding 32%. This demonstrates the dual economic and environmental benefits of super hydrophobic adsorbents.