Gas pipelines are critical facilities for transporting various gases (such as high-purity gases, specialty gases, industrial gases, etc.) in laboratories, industrial production, and scientific research fields. Their design, installation, and operation must strictly adhere to principles of safety, purity, and efficiency. The following provides a detailed introduction to the classification, core requirements, system composition, design points, application scenarios, and maintenance management of gas pipelines.

I. Gas Pipeline Classification

1. By gas type：

• High-purity gas pipelineUsed for conveying electronic specialty gases (such as SiH₄, NF₃), inert gases (such as Ar, He), etc., with extremely high purity requirements (usually ≥99.999%).
• Specialty gas pipelineHandle corrosive (such as Cl₂, HCl), toxic (such as AsH₃, PH₃), or flammable/explosive gases (such as H₂, CH₄).
• Industrial gas pipelineSupply oxygen (O₂), nitrogen (N₂), compressed air, and other conventional gases.

1. By application：

• Lab gas pipelineConnect gas cylinders, generators, and experimental equipment (such as GC, LC-MS).
• Industrial Gas PipelineFor large-scale gas supply systems used in semiconductor manufacturing, chemical production, and metal processing.

Section II: Core Requirements for Gas Pipeline

1. Safety：

• Leak-proofUtilizing double sleeve connectors, welding, or VCR joints for sealing, ensuring no leaks at pipe connection points.
• Explosion-proof designFlammable and explosive gas pipelines must be equipped with explosion-proof valves, flame arresters, and static grounding devices.
• Pressure ControlSet safety valves and pressure-reducing valves to prevent accidents caused by overpressure.

1. Purity：

• Material SelectionHigh purity gas pipelines are made of 316L stainless steel, EP (electrolytic polishing) pipe, or PFA/PTFE plastic pipe to prevent contamination from metal ions or organic matter.
• Internal processingThe inner wall of the pipe requires degreasing, acid washing, passivation, or polishing treatment to reduce surface roughness (Ra ≤ 0.4 μm).
• Gas FlowDesign for unidirectional flow to prevent cross-contamination and set up a blow-off system (such as N₂ blow-off) to clear residual gases.

1. Efficiency：

• Pressure StabilityMaintain constant gas pressure through devices like pressure regulators and surge tanks to ensure continuous experimentation or production.
• Quick SwitchUtilize automatic switching devices (such as gas cylinder cabinets) to achieve seamless gas source switching, reducing downtime.