In continuous operation pipeline systems such as those for oil, natural gas, and chemicals, production shutdown for maintenance results in significant economic losses. The pressure-bearing opening technology emerged as a solution. It enables the connection of branch pipes or maintenance operations without interrupting the pipeline flow or reducing the pressure. The core component of this technology - the pressure-bearing opening equipment - its performance directly affects the success of the operation and the safety of personnel. So, what are the requirements for the pressure-bearing opening equipment? This article will comprehensively analyze the core requirements of this special equipment from multiple dimensions such as technical standards, safety regulations, and performance indicators. I. Basic Concepts and Operating Principles of Pressure-Resistant Opening Equipment 1.1 What is a Pressure-Resistant Opening Equipment The pressure-bearing hole-making equipment is a specialized device used to create holes on pipelines, containers and other pressure-bearing equipment during their normal operation. It is widely applied in scenarios such as pipeline renovation, branch pipe connection, emergency repairs, etc., enabling non-stop operation and avoiding huge losses caused by production stoppage. 1.2 Basic Principles of the Assignment The core of pressure-bearing hole opening operation lies in "pressure isolation". The equipment forms a sealed working chamber by installing special pipe fittings (such as saddle three-way fittings and sealing pipe fittings) on the pipeline and using clamp valves. The hole opening machine is installed above the valve, and the cutting tool passes through the valve to cut the pipeline. After the hole opening is completed, the cutting tool retreats above the valve, and the valve is closed, allowing the equipment to be disassembled in a completely isolated pressure environment. This process places extremely high demands on the sealing, reliability and safety of the equipment. Any failure at any stage could lead to leakage of the medium and even trigger serious safety incidents. II. Core Requirements for Equipment for Pressure-Resistant Hole Opening 2.1 Safety in Design: The Primary Principle for Equipment Requirements Pressure-bearing hole opening operations are defined as special-level hot work operations and are highly hazardous. Therefore, "safety integrity" is the first requirement for pressure-bearing hole opening equipment. This means that safety should be built into every component and every process of the equipment from the very beginning of its design, rather than relying on external operations to make up for deficiencies. Safety integrity is manifested as follows: The equipment must have multiple redundant protections, so that even if one subsystem fails, there is a backup system to ensure safety; the structural design of the equipment should avoid stress concentration and fatigue failure; key components should have sufficient safety factors to ensure that they do not fail under extreme conditions. 2.2 Zero Leakage: The Ultimate Pursuit of Sealing Performance "Zero leakage" is the key performance indicator for equipment with pressure-bearing openings. Under pressure conditions, if the medium (especially flammable and explosive gases and liquids) leaks, the consequences would be unimaginable. Therefore, the sealing system of the equipment must be absolutely reliable. Modern high-end pressure-bearing hole-opening equipment has replaced the traditional lip-sealing method with a multi-line sealing structure. This design has been optimized through fluid dynamics simulation and can maintain tightness under both high and low pressure conditions. The selection of sealing materials is also crucial, and it is necessary to choose materials such as nitrile rubber, fluorine rubber, or metal corrugated pipe seals based on the medium's temperature and corrosiveness. 2.3 High Reliability: Quality Assurance Throughout the Entire Lifecycle Pressure-bearing hole-opening equipment is often used for emergency rescue and maintenance at critical moments, and its reliability cannot be compromised. The equipment is required to maintain stable performance throughout its entire life cycle, which includes: · Material reliability: Key stressed components must be made of high-strength alloy steel, and the cutting tools should be made of hard alloy material and undergo special heat treatment. · Manufacturing reliability: The military-grade welding process ensures that the teeth of the cutter will not experience tooth loss due to welding quality issues. · Design redundancy: For instance, by adding two sets of high-pressure balancing devices, even if one balancing system fails, it can promptly switch to the other set. III. Specific technical requirements for equipment performance 3.1 Requirement for Pipeline Parameter Compatibility The pressure-bearing hole opening equipment must precisely match the parameters of the target pipeline. This is the fundamental prerequisite for selection and use. Pipe diameter and wall thickness: · Small-diameter pipes (DN25 - DN100) are suitable for portable manual or electric hole-making machines. For large-diameter pipelines (DN300-DN2000), a large-scale hole-making equipment powered by hydraulic drive should be selected to ensure that the output torque can meet the requirements of pipeline cutting. The wall thickness of the pipeline (such as SCH40, SCH80) determines the selection of the cutting tool type: for thick-walled carbon steel pipelines, hard alloy cutting tools are required. Pipe material: · Carbon steel pipes: High-speed steel or carbide cutting tools can be selected. · Stainless steel pipes: Due to their high toughness, coated cutting tools (such as titanium nitride coating) should be selected to reduce wear. · Cast iron pipes: Consider their brittleness and control the cutting parameters. · Plastic pipes: Ordinary high-speed steel cutting tools can be used, but the cutting speed needs to be controlled to avoid melting. .2 Pressure Rating Requirements The pressure resistance level of the equipment must be higher than the actual operating pressure of the pipeline.