Views: 0 Author: Site Editor Publish Time: 2024-11-07 Origin: Site
Currently, China's industrialization process is accelerating continuously, with project scales expanding and factory facilities and equipment becoming increasingly sophisticated.Construction processes have also become more complex. The speed and timing of construction impact the project delivery schedule. To complete construction projects within the shortest possible timeframe, innovations have been made infactory-produced piping, adopting prefabrication methods to enhance the speed of pipe installation and improve construction efficiency.
Petrochemical projects in China are primarily carried out in regions with harsh climates, such as Xinjiang and Northeast China. However, the low temperatures in winter make pipeline welding and installation extremely challenging, often necessitating lengthy shutdowns to await favorable weather conditions for resumption of construction.Sometimes, these shutdowns can last for over five months severely impacting the constructions chedule.In contrast, factory-based pipeline prefabrication is not constrained by temperature conditions,as the prefabrication factory can belocated away from the construction site. Furthermore, prefabrication factories possess excellent conditions for pipeline installation and construction, allowing smooth progress of pipeline prefabrication work even during cold winters. This ensures that the construction schedule is not delayed and reduces losses and risks associated with weather and climate factors.
Industrialized pipe prefabrication frees itself from the constraints of construction processes and environments. With the corresponding drawings, tools, and materials in place, the prefabrication and construction of pipes can proceed simultaneously. This way, pipe installation does not occupy subsequent time. In fact,the pipe prefabrication process can even commence during civil engineering and steel structure construction. Starting the pipe construction work in advance can save more construction time and increase construction speed.
The environmental conditions of the construction site of most projects are not good enough, and the narrow and simple site is a common thing, which is not convenient for the construction work. But for specialized prefabrication plants, they tend to have spacious and comfortable interior working Spaces, and also pay attention to cleaning. Therefore, in this clean and wide workshop prefabrication environment, the welding and installation quality of the pipeline will be higher, which can not only ensure the cleanliness of the inside of the pipeline, avoid internal impurities and sand, but also ensure the physical and mental health of the pipeline construction personnel and reduce the work procedure of pipeline cleaning.
Moreover, the professional prefabrication plant also has more professional and advanced construction equipment, which can support the construction and installation of the pipeline, such as plasma cutting machine, non-destructive testing equipment, etc., which can greatly improve the work efficiency, compared with the field only cutting machine, grinder and other small equipment, the conditions of the prefabrication plant have obvious advantages. With the help of large intelligent machinery, the quality of pipeline welding and construction will be higher. At present, some of the domestic construction projects, is the use of large automatic slope cutting machine processing pipe groove, the effect of this mechanical equipment investment is incomparable to the simple facilities on the site, often can create a smoother and neat pipe groove, for the subsequent pipeline welding work to bring convenience. At the same time, the pipeline built and installed in the automation equipment can reduce the error caused by human factors, so that the quality will be better guaranteed to meet the factory prefabricated standards.
Factory pipe prefabrication requires the raw materials and basic equipment to be prepared in the factory first, and then transported to the construction site after prefabrication. At this time, a scientific and appropriate prefabrication plant should be selected as far as possible, and the geographical location of the prefabrication plant and the route planning for transporting raw materials should be comprehensively considered to minimize transportation costs. Prefabrication plants close to raw materials or construction sites are preferred, and for cross-border projects close to ports can be selected. Some overseas projects will choose prefabrication factories that take into account the distance between the port location and the raw material area, which can save transportation costs and transportation time. After the prefabrication is completed, they can be loaded and delivered to the destination by shipping. This convenient and direct mode can well control project costs.
Factory pipe prefabrication must first consider and evaluate the pipe design drawing, and make the prefabricated pipe section drawing according to the pipeline route planning drawing. The drawing needs to be combined with the engineering construction arrangement to divide the pipeline segment, mark the steps of pipeline construction through the form of coding, and mark the welding position of the pipeline welding, and do a distinguishing mark to identify whether the welding joint is a factory prefabricated welding joint. Industrial pipe prefabrication can take advantage of the superior equipment and conditions during prefabrication to undertake more pipeline welding and reduce the pressure of site construction. An important reference in the prefabrication of pipe segments is the scale of packaging and transportation. Because the pipe division will be restricted by the size of the packaging and transportation vehicle. When welding pipes on site, the fixed welding joint must be determined on the premise that the overall size of the pipe segment after packaging meets the capacity of the transport car.
Because the small pipeline is not strong enough, more fragile during transportation, prone to deformation and damage caused by shock, and the on-site welding speed is also very fast, which has little impact on the overall project progress, it is generally not necessary to adopt prefabrication behavior for small pipelines. However, at the connection between the small pipe and the large pipe, that is, in the middle of the pipe base and the reinforcing plate, it is best to set up a factory prefabricated welding joint. However, because the site construction conditions are not good enough, it is difficult to open the pipe and manufacture the reinforcing plate. Therefore, it can be considered to weld the pipe base and the reinforcing plate in advance at the prefabrication factory, where the reinforcing plate can be attached with a branch pipe to facilitate on-site connection.
