c and they cannot stop for a moment. The technologies of pressure-opening and pressure-sealing holes are precisely the cutting-edge tools that ensure this lifeline can be repaired, renovated, and expanded without interrupting the transportation, without discharging media, and without using open flames. When a customer invests in a set of pressure-resistant pipeline non-stop construction equipment, they are not merely purchasing a set of steel-based mechanical equipment; rather, they are purchasing an entire "service blueprint" that guarantees absolute safety on the industrial site, ensures the success of the operation, and supports long-term reliable operation. An outstanding manufacturer of pressure-resistant pipeline non-stop construction equipment demonstrates its true core competitiveness in the comprehensive service matrix covering equipment selection, technical solution design, personnel training, and after-sales maintenance. I. Technological Evolution: The Core Value of Non-stop Pressure-Resistant Construction The non-stop pressure-sealing technology for pipeline maintenance refers to the engineering technique that completes pipeline repair, renovation or emergency repair through processes such as opening holes, sealing and bypass connection while the pipeline is continuously transporting media (such as natural gas, oil, water, etc.) and maintaining the operating pressure. Its core objective is to achieve the switching of old and new pipelines or fault repair without interrupting production, thereby effectively avoiding the huge economic losses and safety hazards caused by traditional shutdown operations. This technology has multiple advantages: it can maintain the normal transportation of pipeline media, reduce energy interruption and economic losses caused by shutdown; it adopts spark-free operations and sealed operations, effectively avoiding the explosion risks of traditional open flame operations; it does not need to discharge the pipeline media, reducing resource waste and environmental pollution. At the same time, it supports various material pipelines such as carbon steel, alloy steel, PE, and cast iron, with a wide range of pipe diameters. In China, currently, our country's non-stop pressure-sealing technology has covered pipe diameters from DN20 to DN1600, with a maximum pressure of up to 10 MPa, and a medium temperature range of -60°C to 350°C. In recent years, this technology has undergone a qualitative leap from "able to stop" to "able to stop well", and from "reacting passively" to "preventing actively". Based on foreign technologies, China's pipeline non-flow sealing business, through long-term and continuous scientific research, has achieved independent innovation in multiple technical processes. The sealing equipment has become increasingly complete, the sealing capacity, specifications and types have been continuously improved, the business scope has also expanded, and the sealing diameters range from 25 millimeters to 1020 millimeters, with the maximum sealing pressure reaching 10 megapascals. II. Manufacturer's product portfolio: Meeting diverse application requirements A comprehensive and reliable manufacturer of pumping and pressure-resistant construction equipment usually has a diverse range of products to meet the complex requirements of different working conditions, pipe diameters and pressures. The core products mainly include: Pressure-bearing hole opening machine: This is a key equipment for completing mechanical cutting hole drilling on operating pipelines without stopping the medium flow. The modern design needs to meet the safety and precise operation requirements under high pressure (up to 12 MPa or above) and large-diameter environments. Common driving methods include various forms such as hydraulic drive and electric drive. Hydraulic drive uses a pair of hydraulic motors combined with a differential shaft system for transmission, which can provide sufficient torque output; electric drive integrates the design of the motor and reducer, and combines with worm gear worm transmission, supporting full coverage of pipe diameters. Pressure-sealing device: A key equipment that precisely seals the flow of pipeline media through the expansion of an expansion cylinder or a rubber cup, driven by hydraulic or mechanical transmission. Common types include disc-type sealing (rubber cup, suitable for high-pressure pipelines but sensitive to pipeline roundness), cylindrical sealing (expanding metal barrel, with strong resistance to impurities, suitable for deformed or severely corroded pipelines), and airbag sealing, etc. Depending on the pressure level of the medium, bag-type sealing heads are applicable for low pressure (≤0.5MPa), while high pressure (>2.5MPa) requires various configurations such as dual-stage sealing sealing heads or hydraulic active sealing systems. Clamp Valve: As a temporary sealing barrier in the entire construction system, it is installed between the flange adapter welded to the pipeline and the opening machine to ensure stable pressure during the opening and sealing process, effectively preventing medium leakage. The three-plate gate valve design has small diameter error, the sealing pressure needs to reach a specific multiple of the pipeline's working pressure, supports rapid machine replacement operations, and is the first safety gate for isolating the working chamber from the high-pressure medium inside the pipeline. The sealing performance of the clamp valve must be extremely reliable, with the sealing pressure needing to reach a relatively high multiple of the pipeline's working pressure to provide effective isolation during the opening process. Hydraulic Power Station: The core unit that provides hydraulic power for the hole opening machine and the plugger. It must have stable and controllable pressure output, and be equipped with complete overpressure protection, filtration cooling, and safety interlock functions to ensure that the entire construction process is powered adequately and controlled safely. Bypass system: Composed of bypass pipelines and balance valves, it is used to temporarily divert the medium during the construction process, ensuring that the medium in the main pipeline can continue to be transported through the bypass during the construction period without affecting the normal production or life of downstream users. III. Qualification Certification and Compliance with Standards: The Hard Requirements for Selecting Manufacturers When choosing a manufacturer of non-stop pressure-limited construction equipment, the first thing to pay attention to is whether they have a complete set of qualification certification systems. This is a crucial criterion for evaluating the professionalism and compliance of the manufacturer. In terms of industry entry, equipment manufacturers usually need to obtain the Special Equipment Manufacturing License of the People's Republic of China (for pressure pipeline components), which is the legal qualification for manufacturing pressure pipeline components. Additionally, at the engineering service level, manufacturers with corresponding grades of Petrochemical Engineering Construction General Contracting Qualification, Municipal Public Works Engineering Construction General Contracting Qualification, and Class A qualifications for pressure-bearing plugging of long-distance oil and gas pipelines, usually have more solid engineering performance and technical strength. In terms of quality management, obtaining the three certifications of ISO9001 Quality Management System, ISO14001 Environmental Management System, and ISO45001 Occupational Health and Safety Management System is a basic sign of standardized management by the manufacturers. At the same time, in terms of technical specifications, they must strictly follow the latest national standard GB/T 28055-2023 "Technical Specifications for Pressure-bearing Plugging of Steel Pipelines", which was officially released and implemented on May 23, 2023, replacing the 2011 version completely. It stipulates the technical requirements for pressure-bearing opening and plugging operations of steel pipelines. This standard is applicable to pressure-bearing opening operations of steel oil and gas transmission pipelines and plug-type, folding-type, cylindrical-type, bag-type, hydraulic active, double-stage sealing, and intelligent types of plugging operations. For other media pipelines, they can also be implemented after fully assessing the risks brought by the medium temperature or toxicity, etc. These qualifications not only serve as evidence of the manufacturer's strength, but also represent a solemn commitment from the company to deliver "compliance and safety" as the primary product to customers. IV. Service System: The Core Competence of High-Quality Manufacturers The delivery of a set of high-quality equipment merely marks the beginning of the manufacturer's services. The true core competitiveness lies in the professional service capabilities that run through the entire process from pre-sale, during-sale to post-sale. Pre-sales technical services: In-depth investigation and customized solutions True quality service begins long before the sale takes place. Professional equipment manufacturers primarily assume the roles of "technical advisors" and "risk bearers". The technical team will go to the site in person, rigorously verify the precise parameters of the pipeline, analyze the chemical properties of the medium, and comprehensively assess the complex working space and environmental risks. Based on these valuable first-hand data, the manufacturer will provide a tailor-made pressure-holding operation technical plan. This plan will precisely recommend the appropriate equipment models and supporting tools, and detail the safety emergency plan, quality control nodes, and personnel configuration requirements, ensuring that before the equipment arrives at the site, the entire operation process has been "pre-played" theoretically, and all uncertain factors have been excluded. Technical training and empowerment: Building customers' self-construction capabilities Converting a set of sophisticated equipment into stable and reliable productivity for customers hinges on "people". Therefore, top manufacturers regard systematic training as the core part of their services. Professional training usually includes theoretical explanations (covering equipment structure and principles, hydraulic and electrical control systems, safety regulations and standards, etc.) and simulated practical training (conducting full-process drills using simulated pipelines or scrap pipe sections, focusing on training key operations such as concentricity correction during equipment installation and air tightness testing).