Taking a practical project as an example, this paper puts forward a method for calculating the most critical across-wind loads on single tube RC chimney due to vortex shedding as per GB/50051, and briefly discusses the possible approaches to reduce the across-wind loads due to vortex shedding. The calculations indicate that the chimney may be subject to significant across-wind loads due to vortex shedding while the wind speed is far less than that corresponding to the reference wind pressure. Therefore, considering solely the reference wind pressure in wind load calculation and structural design is not safe. It is necessary to check all possible wind speeds to find the most critical wind load effects. To reduce the wind loads due to vortex shedding, the dynamic characteristics of the chimney can be adjusted by changing the chimney’s size and wall thickness.

 When oil and gas pipelines are damaged by geological disasters, oil and gas leakage may occur. The spread of oil and gas in the atmospheric, soil, and water environments can lead to fires, explosions, and environmental pollution, which has a significant impact on public safety. During the design, construction, and operation stages of oil and gas pipelines, high requirements are placed on the geological conditions along the pipeline route. This paper, in combination with the current research status of expansive soil at home and abroad, sorts out the cases of oil and gas pipelines being damaged by expansive soil over the years, briefly analyzes the field characteristics and indicators of expansive soil, and proposes targeted prevention and control measures for expansive soil disasters in oil and gas pipeline areas, providing reference for the effective management and control of expansive soil.

The design method of reinforced flat cover with bolt connection is discussed from the aspects of strength and stiffness, and the structure of flat cover is calculated using finite element software. The calculated thickness design method for flat cover is found to be in good agreement with the simulation results.

 With the continuous improvement in requirements for prefabrication and factory fabrication, the application of steel structures in the petrochemical industry has developed rapidly. With the increase of steel plate thickness and weld size, the stress state of connections has become increasingly complex, and the problem of lamellar tearing of thick plates in steel structures has become remarkable. Especially in the cold regions of Northeast China, Z-direction lamellar tearing failure of thick plates occurs constantly. This article starts with the mechanism of lamellar tearing, analyzes its influencing factors, and proposes some assurance measures for reducing the tearing failure of thick plates as well as some optimization measures for weld joint design.

During the operation of synthetic gas heat exchanger 6E-3 in a natural gas reforming hydrogen production unit of a petrochemical company, the shell-side pressure drop far exceeded the design limit, accompanied by ?high-decibel abnormal whistling noise?. Through calculation and analysis, it was found that the high shell-side pressure drop and the noise were caused by the excessively high flow rate of gas phase medium in the shell side. Then, the shell-side structure of the heat exchanger was modified by transforming the single-pass shell structure into a double shunt structure to divert the gas phase medium in the shell side. After the structural modification, the actual shell-side flow rate decreased greatly, the pressure drop was only one eighth of the original pressure drop, and the abnormal whistling noise was eliminated, effectively solving the fault of the heat exchanger.

Taking several international EPC projects as examples, this paper introduces the definition, organization and implementation, basic procedures, stage division and other concepts of the constructability study in project quotation and execution stages. At the same time, the different applications of constructability study in domestic projects and overseas projects are compared and analyzed, the guidance and practical significance of constructability study for the quality, safety, schedule and cost control of EPC projects are put forward, the shortcomings of domestic engineering companies in this aspect are pointed out, and some improvement countermeasures are put forward.

Instrumentation is an essential part of 3D plant modeling, and designers commonly use DDP to replace placeholder instrumentation. However, in actual projects, errors often occur due to malfunctioning database triggers and mismatching general data, leading to frequent modifications and affecting project progress. This article provides a detailed solution for DDP file batch repair and integrated verification with S3D to solve these two problems, ensuring project progress.

The 3.5MPa steam line safety valve was disassembled for inspection during the maintenance of a hydrogen production unit of a petrochemical company, and cracks were found in the surfacing layer on the sealing surface of the valve disc. It was found through analysis that the main causes of the leakage of main steam safety valve include the prolonged erosion by high-temperature and high-pressure steam and the improper heat treatment during surfacing welding. To solve these problems, methods such as ensuring the quality of safety valve component materials, reasonably optimizing structural design, and paying attention to precautions during safety valve maintenance have been explored, providing reference for the analysis and treatment of similar defects in other steam safety valves.

During summer production, the dry gas processed at Station A is conveyed at low pressure via the DN 400 interconnection line to Injection Station B, where it is pressurized by the gas injection machine and reinjected at high pressure for peak shaving purposes. Conversely, during winter production, high-pressure wet gas separated by the two-phase separator at Injection Station B is transported via the DN 400 interconnection line to Station A for processing. Prior to dry gas injection, pigging is performed for the interconnection line to enhance transportation efficiency and ensure the normal functioning of equipment at the injection station. In March 2024, the first pigging of the DN 400 interconnection line was performed, resulting in a total clearance of 320 cubic meters of accumulated liquids along with significant quantities of black powder through both forward and reverse pigging operations. To address the issues related to excessive accumulation of liquid and black powder, an analysis was performed focusing on factors such as equipment conditions at Injection Station B and elevation profiles along the interconnection line, and sampling and testing of black powder were conducted to determine its chemical composition. Based on the investigation of site-specific characteristics of wet natural gas alongside operational parameters, some appropriate countermeasures were proposed. These measures not only enhance pipeline transportation efficiency, mitigate corrosion risks, ensure safe, stable and efficient pipeline operations, but also reduce potential damage caused by accumulated liquids and black powder to equipment at the stations.

The internal environment of high-temperature petrochemical pipelines is complex and ever-changing, and some of the pipelines face high pressure and corrosion resistance requirements. Materials are facing new challenges and need to find new ways out. This article compares the mechanical properties and other technical indicators of various materials used for steam pipelines in power plant boilers (chromium molybdenum steel, stainless steel, heat-resistant steel) with those of high-temperature petrochemical pipelines, and briefly analyzes the reasons for the differences in their technical indicators. In addition, by analyzing the research and development process and ideas of steam pipeline materials for ultra-supercritical power plants, combined with the special service environment of high-temperature petrochemical pipeline materials, this paper explores the potential for adapting moderately developed power plant materials for application in the petrochemical industry.

 This article introduces the circulating fluidized bed oxygen rich pressurized gasification technology used in the coal-based hydrogen production unit of a plant, including the gasification process, the layout plan of main equipment, and the design and stress calculation of related synthesis gas pipelines. The industrialization of this gasification technology has reference significance for the transformation of fixed bed ammonia synthesis, large-scale manufacturing of industrial gas, hydrogen production, and chemical synthesis gas.

 This research focuses on chemical pipeline design and material grade selection, aiming to enhance production efficiency, reduce accident risks, and ensure operational stability and safety. Firstly, the basic principles, processes, and key elements of chemical pipeline design were analyzed based on process requirements and environmental conditions, with discussions on achieving rational design. Secondly, material grade selection strategies were investigated by evaluating the impacts of physical and chemical properties of different materials on pipeline performance, along with practical recommendations for material selection adapted to specific working conditions. The findings provide scientific and practical references for industry professionals.

Driven by the national energy strategy, LNG terminals will continue to be built and expanded, and the full localization of cryogenic ball valves for LNG terminals has become an urgent demand. Based on the design conditions, operating conditions and medium characteristics of the LNG terminal pipelines, this paper introduces the structural types and technical features of LNG cryogenic ball valves in response to the requirements for valve operational performance and sealing performance. It elaborates on the key technical points of the localization of LNG cryogenic ball valves, including the analysis and calculation of key components as well as the sealing structure, material control, manufacturing and machining, and type test.

In response to the increasing adoption of cost plus remuneration contract model in petrochemical projects, this paper introduces the cost plus remuneration pricing methodology and, based on experience from multiple petrochemical projects, analyzes key challenges faced by  contractors, such as increased process control difficulties, cost ambiguity and complex settlement procedures, so as to achieve the goal of win-win for both parties.

 Integrated with the implementation of relevant standards, specifications, regulations and policies in the overall planning and design of chemical industrial parks, this paper introduces key "chain-breaking" disaster mitigation measures in response to natural disasters from aspects such as site selection, special planning, risk assessment, site elevation design, park drainage ditches and factory drainage facilities, so as to provide theoretical guidance for the overall planning and design of chemical industrial parks.

This article explains the significance and current situation of trade secrets protection and sorts out the legal system for protecting trade secrets, and then summarizes the factors for determining the elements of trade secrets and the trial process for trade secret cases. Finally, from the perspective of the court's reasoning, the following countermeasures are proposed for companies to protect trade secrets: retaining documents that can prove the rights holder, paying attention to identifying the essence of trade secrets, improving the protection measures for trade secrets, and taking multiple measures to protect their own rights and interests.