【In-depth Discussion on Modular Installation for HaiChuan】Modular Construction of the Zhejiang Petrochemical Pipeline Tunnel Project 19

Report from our newspaper (Correspondent: Xie Jingwei) On September 22, significant progress was made in the modular construction of Zhejiang Petrochemical’s 40 million tons per year refining and chemical processing project, which is operated by one of the company’s subsidiaries. A steel framework measuring 27m*41m*33.6m, along with the pipes attached to it, had a total weight of 1,480 tons; it was moved forward steadily under the traction of 4 flatbed trucks, each 33 meters long and equipped with 88 wheels. Under the unified organization of Zhejiang Petrochemical, the transportation process took place from 9:15 a.m. to 4:30 p.m.; after an 8.25-hour journey over a distance of 2.5 kilometers, the giant modules were carefully placed on their foundations with perfect accuracy, without any errors. 　　The requirements for modular construction in the Zhejiang Petrochemical Pipeline Project represent a technological innovation effort pursued independently by both parties; in the face of these challenges, Hunan Installation became the \"first to try it\". First, it aims to achieve higher-quality products through new technologies and standardized construction methods ； Secondly, it reduces the safety and quality risks associated with on-site work by using factory-prepared components, thereby minimizing the time that construction takes up major traffic routes ； Third, shorten the project duration by expanding the working area. 　　The project is located on an isolated island in Zhoushan, where transportation and construction activities are extremely difficult; moreover, the client has requested that we further shorten the project timeline. To meet the owner’s requirements, before the civil foundation was ready, the project team assembled the steel structure of the pipe gallery and the pipes located at the transportation hub on Petrochemical Avenue and Central First Road into modules. The 10 axial steel frames were constructed in three separate modules, and after careful consideration, the \"processing plant\" was located at the project team’s prefabrication facility, 2.5 kilometers away from the installation site. To ensure product precision, the construction workers installed embedded plates in the foundation at the prefabrication plant in advance, keeping the installation accuracy of individual columns within 0.5 mm ； To ensure modular transportation, the project team increased the proportion of ultrasonic testing for steel structures to 100%; there are a total of 19 pipes included in the module assembly, with as many as 8 different materials used ； To meet the deadline of September 22 for transportation, the project team actively organized overtime work; at peak times, as many as 40 welders were working ； To ensure modular load-bearing transportation, the lateral fixtures are constructed using 700*300*13*24 steel sections in a paired configuration, while the diagonal braces are made from 588*300*12*20 steel sections in a paired configuration; the weight of just the assembled framework amounts to 96.9 tons. 　　The successful overall transportation and installation of the first module after the modular prefabrication of the pipeline gallery for Zhejiang Petrochemical’s 40 million tons per year refining and chemical processing project not only fulfilled the commitments made to the client through bold actions but also demonstrated the fearless and determined spirit of the people at Xiang’an.

New method for pipeline tunnel installation – Modular assembly and installation of pipeline tunnels https://bbs.hcbbs.com/thread-1330426-1-1.html (Source: Haichuan Chemical Industry Forum website)

The installation contractor is Hunan Provincial Industrial Equipment Installation Co., Ltd. This company was assigned the installation work for Section 2-1 of the entire plant’s infrastructure as part of the first phase of Zhejiang Petrochemical’s 40 million tons per year integrated refining and chemical processing project. The work included the installation of main pipelines and network systems in that section, as well as the plant’s lightning protection, anti-static measures, and grounding systems; additionally, it covered the installation of power supply systems and road lighting throughout the plant. The provisional contract value is approximately 120 million.

Question: Why are pipe segments rarely assembled in modules? Has the design for all the external pipes in the plant not been completed yet? From now on, the workload for threading and welding the process pipe sections within the 8-layer framework will be significantly increased.

The contract amount seems low; it doesn’t include the main materials

I think it’s possible; these days, the ductwork is designed first and then the pipes, and the ductwork will have additional supports added as needed by the pipes

The industry says that the contract price for the Zhejiang Petrochemical project is kept low; with a sluggish market, projects still have to be carried out even if it means lower prices in order to cover the costs. Li Rongshui is secretly amused:D

It’s not that issue. The design requirements for the system’s external pipes come from each plant’s engineering team – that is, each plant has certain pipelines that need to enter and exit the system’s external pipes in order to reach other plants. Only after these requirements from the individual plant teams have been finalized can they be submitted to the central utility engineering team. Based on the requirements provided by each plant team, the utility engineering team can then arrange the pipelines along the utility ducts. So I suspect that the design for the equipment department has been delayed, which in turn has delayed the piping design in the utilities department; as a result, the construction drawings for the structural section are already ready, while the work on the process, electrical, and instrumentation sections is still in progress. The construction contractor only had the structural drawings available, and the delivery deadline for the pipe gallery at the end of September could not be delayed (due to penalty clauses); therefore, a pure steel structure pipe gallery had to be brought to the site. I’m so upset....:'(