2025 year 4 moon，Shanghai Oulan Pipe Industry Technology Co., Ltd “A corrosion-resistant inner and outer coated composite steel pipe” patent technology（Announcement No. CN 222760443 U）Formally put into industrial application，This technology is designed with modular protection，Not only does it extend the service life of the coated pipe to 30 years or more，More efficient replacement of damaged parts has been achieved，Subverting traditional coated plastic pipes “A damaged area、Whole section replacement” The operation and maintenance mode。
Once the outer wall coating of traditional plastic coated pipes is impacted、Wear and tear resulting in damage，Steel substrate is highly susceptible to corrosion after exposure，And repair requires shutdown and pipe cutting，Serious impact on the continuous operation of industrial pipelines。The patented technology adopted by Oulan Pipe Industry “Basic coating + Replaceable protective cover” The double-layer structure：The pipeline substrate is first sandblasted for rust removal, and then sprayed with epoxy resin bottom layer，Forming thickness 0.8-1.2mm The basic anti-corrosion layer；The outer layer is covered with a protective tube made of modified polyolefin，Quick fitting and fixation achieved through convex rings and fixing devices。When the outer protective tube is damaged，No need to stop the pipeline，Simply remove the fixing device to replace the damaged section separately，Single maintenance time from 4 Shorten hours to 20 minute，Reduced maintenance costs 70%。
In the renovation project of the acidic wastewater transportation pipeline network in Shanghai Chemical Industry Park，The plastic coated pipe using this technology has been operating stably 8 month，After testing, the corrosion rate of the outer wall of the pipeline is 0.002mm / year，Only for traditional coated pipes 1/20。Introduction of the person in charge of park operation and maintenance：“Severe corrosion of pipelines in the chemical industry area，Previously, it was necessary to replace it every year 200 Rice pipeline，After adopting Oulan's patented products，Only replaced 3 Section protective cover，Comprehensive cost savings of over one million yuan。” currently，This technology has formed an annual production capacity 50 Production capacity of 10000 tons，The product has successfully entered BASF、Procurement List of Large Chemical Enterprises such as Wanhua Chemical。