1. Industrial field
Chemical pipeline: transporting highly corrosive media (such as sulfuric acid and hydrochloric acid), with the inner tube made of PTFE or titanium alloy, the outer tube made of carbon steel, and an interlayer for corrosion prevention and leakage monitoring.
High-temperature transmission: In the petroleum and power industries, steam/hot oil is transmitted through vacuum double-walled pipes or filled with aerogel, reducing heat loss by more than 50%.
2. Architecture and municipal administration
Central heating: The urban heating pipeline network utilizes steel outer pipes with a polyurethane insulation layer, which increases thermal efficiency by 20% and ensures a lifespan exceeding 30 years.
Drainage system: In geologically unstable areas, HDPE inner pipes are used with fiberglass outer pipes. The interstitial layer is filled with gravel to prevent settlement, reducing the blockage rate by 80%.
3. Energy sector
LNG pipeline: transporting -162℃ liquefied natural gas, with a daily evaporation rate of vacuum double-walled pipe ≤0.1%, reducing cold loss.
Nuclear power plant cooling: Titanium alloy inner tube + stainless steel outer tube, with a gap layer for monitoring radiation leakage, ensuring nuclear safety.
4. Environmental protection field
Landfill site: The inner pipe of the leachate pipe is made of HDPE, while the outer pipe is made of carbon steel. The gap layer is filled with activated carbon to adsorb odors and prevent groundwater pollution.
Exhaust gas emission: The chemical industry emits corrosive gases. Double-walled pipes separate the medium from the outer pipe, extending equipment life.
5. Special environment
Deep-sea oil and gas: Subsea pipelines are subjected to high pressure and low temperature. Double-walled pipes provide corrosion protection and prevent electrochemical corrosion, extending their lifespan to 30 years.
Polar heating: Vacuum double-walled pipes prevent cold loss, avoid soil freezing, and reduce energy consumption by 40%.
6. Emerging technologies
Smart utility tunnel: Underground utility tunnels integrate power and communication lines, with cables pre-embedded in the interstitial layer, saving space and facilitating maintenance.
Medical gas: The hospital delivers oxygen/nitrogen, utilizing a 316L stainless steel inner tube paired with a copper outer tube. The interstitial layer is filled with nitrogen for explosion protection, ensuring a zero safety accident rate.