Maintenance Guide for Pressure-Resistant Hole-Opening Equipment: Ensuring Safety for Every "Pressure Surgery"At the site of a gas pipeline relocation project in a city in North China, a piece of equipment that had just completed its 31st hole drilling operation was suddenly halted - during the routine inspection, the technicians discovered a nearly imperceptible minor wear in the main shaft box. This planned maintenance prevented a possible high-pressure gas leakage accident that could have been caused by a sudden equipment failure. The pressure-bearing opening technology is a highly demanding "heart surgery" in pipeline engineering. It enables renovations or repairs to be carried out without interrupting the medium transportation in the pipeline. The performance of the pressure-bearing opening equipment used to perform this "operation" directly affects the success and safety of the operation. Unlike ordinary tools, these expensive professional equipment work in high pressure, high load and complex medium environments for a long time. Systematic and scientific maintenance is not an optional后勤 work but a core technical link for ensuring project safety， controlling operating costs and extending equipment lifespan. This article will help you establish a complete maintenance system ranging from routine maintenance to in-depth overhaul, ensuring that your equipment is always in the best ready state for operation. I. Why Maintenance Is Crucial: An Active Approach Beyond Fault Repair Many teams are accustomed to the "repair after failure" mode. However, for equipment with pressurized openings, this approach carries significant risks. A failure of the equipment during an operation not only means having to stop the operation and dismantle the equipment for repair, but it could also lead to damage to the already opened part and even trigger serious safety accidents. The core value of preventive maintenance lies in: · Safety Assurance: By conducting regular inspections and replacing sealing components, as well as conducting structural integrity tests, we can fundamentally eliminate potential safety hazards such as leaks and ruptures. · Cost Control: Prevent catastrophic damage to critical components (such as hole-cutting tools, hydraulic motors), as the replacement cost for these components is much higher than the regular maintenance expenses. The delay in project schedule caused by a single unplanned repair is even more incalculable in terms of losses. · Stable performance: Proper maintenance can ensure that the equipment outputs the rated torque and speed, guaranteeing a smooth and precise hole-making process, and enhancing the quality and efficiency of the operation. · Extend service life: Scientific lubrication, cleaning and storage can effectively resist corrosion and wear, significantly extending the service period of the equipment. II. Maintenance Guide for Core Components: Key Points for Precise Maintenance A complete pressure-bearing hole-opening equipment usually consists of a hole-opening machine, a hydraulic power unit, cutting tools, sealing devices, etc. Here are the maintenance guidelines for the most crucial and vulnerable components. 1. Hole-cutting tools: The foundation of cutting capability For the components that come into direct contact with the pipe wall, the condition of the cutting tool directly determines the quality of the hole opening. Post-operation inspection: After each hole is drilled, the cutting tool must be thoroughly cleaned and the teeth checked. Check for any broken teeth, cracks or detachment. Minor cracks can be evaluated for use after grinding, while cracks must be replaced. · Check roundness: Regularly (for example, after every 10 operations) check the overall roundness of the cutting tool. Excessive roundness deviation will cause unstable cutting, increased vibration, and accelerated equipment wear. If the deviation exceeds the allowable limit, professional correction or scrapping is required. · Welding teeth: If new teeth need to be welded, it is essential to ensure that their inclination angle, cutting angle, and other features are exactly the same as those of the other teeth. The welding temperature must be controlled in accordance with the process standards to prevent local annealing that could affect the strength. 2. Main shaft and drill pipe: The backbone of power transmission The drill pipe is responsible for transmitting torque and feed thrust, and its coaxiality is of crucial importance. · Cleaning and Lubrication: After each operation, remove all chips and corrosive substances from the drill rod, and apply an appropriate amount of lubricating oil before installing the bushing to reduce wear. · Prevent deformation: Abnormal bending of the drill pipe is a fatal flaw. During transportation, hoisting and storage, it must be ensured that it is in a naturally drooping state or receives uniform support. It is strictly prohibited to squeeze, impact or place it horizontally for a long time for load-bearing purposes. · Inspect the bushing: Regularly check the sliding bearing sleeve that mates with the drill pipe inside the main spindle box. If there is unilateral or uneven wear, it usually indicates that the drill pipe has bent. At this point, it is necessary to simultaneously inspect the drill pipe and the bushing. 3. Sealing System: Barrier against Pressure Sealing is the lifeline for the safety of pressure-laden operations. · Regular replacement: After each operation on pipelines exposed to high temperatures or transporting corrosive media, all related sealing rings and sealing elements must be replaced. One must not take any chances. · Clean the sealed chambers: After the operation, the connection box and other sealed chambers must be opened. Use a high-pressure cleaning gun and brush to thoroughly remove the accumulated metal chips and dirt inside to prevent them from damaging the sealing surfaces or affecting the positioning of the sealing components. · Hydraulic Sealing: For hydraulic systems, special attention should be paid to the sealing gaskets of the hydraulic valves. Check whether they have been cut due to improper assembly, or have aged and deformed due to long-term pressure and overheating. Maintaining ultra-high cleanliness of the hydraulic oil is the foundation for preventing the wear of sealing components and internal leakage. 4. Gearbox and Hydraulic System: The Heart and Muscles of the Equipment · Gearbox maintenance: For open-circuit machines with gear transmission, it is necessary to regularly (such as every 3-6 months or as per the manufacturer's instructions) check the oil level and quality of the gearbox. Even if the usage is not frequent, it is recommended to change the gear oil once a year to prevent the accumulation of condensate water and dust from affecting lubrication. · Hydraulic system maintenance: The hydraulic power unit is the "heart" of the equipment. Every time the equipment works for approximately 60 hours, the hydraulic pump station should be inspected. Ensure that the hydraulic oil is clean, the oil level is normal, and the filter elements are replaced regularly. If the hydraulic motor shows weakness, low-speed crawling, or a decrease in torque, it is often related to internal wear causing internal leakage, and professional repair is required. III. Establish a periodic maintenance system: Implement comprehensive management covering daily, monthly, and annual periods.