cresponsible for delivering water, discharging sewage, and transmitting energy. When these "vessels" become clogged, broken or aged, a professional and efficient pipeline repair service team becomes the "emergency doctor" of the city. In recent years, with the rapid development of non-invasive repair technology, pipeline repair has shifted from the previous "open and dissecting" approach to meticulous "minimally invasive surgeries". These professional teams, equipped with advanced equipment, proficient techniques and rich experience, are silently safeguarding the safety and smoothness of the city's underground lifelines. 01 Technological Transformation: From "Large-scale Excavation" to "Minimally Invasive" Repair Revolution The field of pipeline repair has witnessed a technological revolution in recent years. The traditional excavation-based repair methods are gradually being replaced by non-excavation repair technologies. This transformation not only enhances the repair efficiency but also significantly reduces the impact on urban operation. In the past, pipeline repair meant full excavation, which not only involved a large amount of work and a long construction period, but also caused serious disruptions to traffic, the environment and the lives of citizens. Nowadays, non-invasive repair technology is like minimally invasive surgery in the medical field. It can complete the repair simply by using inspection wells or small work pits. Ultraviolet in-situ curing method (CIPP) is one of the current mainstream non-digging repair technologies. This technology involves inserting a soft tube impregnated with resin into the original pipeline, and then using ultraviolet light to irradiate and cure the resin, thereby forming a high-strength inner liner pipe. This technical advantage is quite obvious: the construction time is short, the flexibility is high, and the surface becomes smooth after curing and is not prone to adhering to garbage, making it convenient for later maintenance. The practice of the Municipal Management Office of Deqing County has demonstrated the efficiency of this technology: traditional excavation and repair projects usually take more than a week, but with the non-excavation technique, the duration is shortened to 6-8 hours. Hydraulic expansion pipe technology, stainless steel quick locking devices, and stainless steel double expansion rings are also providing diverse solutions for various pipeline defects. These technologies are applied flexibly based on factors such as the extent of pipeline damage, pipe diameter size, and environmental conditions, achieving "tailoring the treatment to the problem". 02 Core technical and equipment support of the professional team A professional pipeline repair service team must possess comprehensive technical capabilities and be equipped with advanced specialized equipment. The technical strength and equipment level directly determine the quality and efficiency of the repair project. Pipeline inspection technology forms the basis of repair work. Modern pipeline repair teams generally employ advanced equipment such as CCTV inspection robots and pipeline telescopes. These devices can penetrate deep into the pipeline and transmit real-time images, helping technicians accurately identify the location, type and extent of pipeline defects, and providing a scientific basis for formulating repair plans. The pipeline inspection robot has achieved excellent performance, including certain waterproof capabilities, lens anti-fogging features, climbing ability, and it can conduct continuous inspections of up to 50 meters in pipelines with a diameter of over 400 mm, generating pipeline inspection videos. For different pipe defects, the professional team is proficient in various repair techniques. The point repair technology is used for local pipe defects (such as cracks, leaks, interface misalignment, etc.). Through robots or airbag systems, prefabricated repair materials are delivered to the target location for point repair. This type of technology is applicable to isolated defects or early diseases found during pipeline operation. It can complete local repairs without interrupting the overall operation of the pipeline network. In addition to ultraviolet light curing technology, the team also needs to master methods such as hot melt repair and resin sealing. For severely deformed, broken or blocked pipes, excavation repair techniques may be required. The damaged pipes need to be removed and replaced with new pipes such as HDPE double-wall corrugated pipes, which are corrosion-resistant and have a long service life. 03 Specifications for Pipeline Repair Procedures and Quality Management The professional pipeline repair service team adheres to strict construction procedures and quality management systems, ensuring that every repair project can achieve the expected results and remain durable and reliable. The preliminary investigation and inspection are the initial steps of the restoration project. The team needs to conduct a comprehensive on-site investigation of the pipeline to understand the extent of damage, location, diameter, and other relevant information. The CCTV inspection robot is used to conduct inspections inside the pipeline, taking photos of the interior, analyzing the damage situation of the pipeline, and providing a basis for formulating the repair plan. Pipeline pre-treatment is a crucial step to ensure the repair outcome. Before the repair, all kinds of deposits and obstructions within the pipeline must be removed first. It is particularly important to ensure that there are no sharp objects on the inner wall of the pipeline - this step may seem basic, but it is actually crucial. If not handled properly, the remaining impurities may puncture the hose, which will directly affect the subsequent curing effect. The repair construction process requires meticulous operation. Taking ultraviolet light curing repair as an example, during the cutting process, different measures need to be taken according to different pipe diameters: for small pipe diameters, manual traction can be used to pull the hose in; for large pipe diameters, a winch machine needs to be used for assistance to ensure that the hose is free from wrinkles and no misalignment. When cutting the materials, it is necessary to maintain a uniform speed to prevent the accumulation and flipping of the materials. At the same time, ensure that the materials are not worn or scratched. Quality inspection is the final step in the restoration project. After the restoration is completed, it needs to be inspected by combining a backwater test with CCTV re-inspection. The water-tightness test is carried out in accordance with relevant standards. The test is considered successful if there is no leakage after maintaining pressure for a certain period of time. The CCTV re-inspection involves a comprehensive filming of the repaired section of the pipeline to confirm that there are no defects in the repaired area. 04 Multiple Application Scenarios and Differentiated Service Strategies The skills and techniques of the pipeline repair service team play a crucial role in various scenarios. Depending on different environments and pipeline types, the team needs to develop differentiated service strategies. The municipal drainage system is the main application area for pipeline repair services. The underground drainage network in cities, which serves as the primary carrier for collecting and transporting rainwater and sewage, directly affects the metabolism and circulation of the city. For the improvement of key areas prone to flooding in urban areas, professional teams usually employ a variety of non-digging repair techniques to update and renovate the rainwater and sewage pipelines. Industrial pipeline repair places higher demands on technology.