Green Pipeline Network Science Popularization: The new recyclable pipeline fittings reduce carbon emissions by 40% compared to traditional fittings, and municipal projects are now being widely promoted in batches
21-11-12
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With the continuous promotion of urban renewal actions and underground pipeline network filling projects in China, the speed of low-carbon technology implementation in the field of municipal infrastructure has significantly increased in recent times. The reporter learned from the "Green Pipeline Network Innovation Achievement Promotion Conference" held by the China Urban Water Supply and Drainage Association today that according to the full life cycle evaluation of authoritative institutions, the new modular recyclable pipeline fittings independently developed in China have reduced carbon emissions by more than 40% compared to traditional pipe fittings. Currently, they have been widely applied in municipal rainwater and sewage diversion and water supply quality improvement projects in dozens of cities across the country, becoming the core lever for reducing carbon emissions in underground infrastructure.
With the continuous promotion of urban renewal actions and underground pipeline network filling projects in China, the speed of low-carbon technology implementation in the field of municipal infrastructure has significantly increased in recent times. The reporter learned from the "Green Pipeline Network Innovation Achievement Promotion Conference" held by the China Urban Water Supply and Drainage Association today that according to the full life cycle evaluation of authoritative institutions, the new modular recyclable pipeline fittings independently developed in China have reduced carbon emissions by more than 40% compared to traditional pipe fittings. Currently, they have been widely applied in municipal rainwater and sewage diversion and water supply quality improvement projects in dozens of cities across the country, becoming the core lever for reducing carbon emissions in underground infrastructure.
It is reported that traditional municipal pipeline fittings are mostly made of gray cast iron and PVC materials with a large amount of non environmentally friendly additives added. The production end relies on blast furnace smelting and high-energy heat consumption processing technology. After being scrapped, most of them can only be disposed of by landfill. The risk of leakage of heavy metals and difficult to degrade additives is high, and the carbon footprint of the entire life cycle remains high for a long time. The new recyclable pipe fittings promoted this time use modified full cycle polyolefin raw materials, abandoning traditional adhesive and welding fixing modes structurally. They adopt a snap on splicing design without additional consumables, and each product comes with a unique traceability QR code. After scrapping, they can be directly returned to the factory for crushing and reshaping without significant degradation of material properties. Theoretically, unlimited recycling can be achieved.
The evaluation data released by the North China Design and Research Institute of Municipal Engineering in China shows that the carbon emissions of recyclable pipe fittings of the same specifications from raw material mining, production and processing, on-site construction to scrap recycling are 42% lower than traditional gray cast iron pipe fittings, and the comprehensive leakage rate is reduced by 90% compared to traditional pipe fittings. The indirect reduction in water and drainage energy consumption can further reduce the total carbon emissions.
At present, this type of low-carbon pipe fittings has left the pilot stage and entered the stage of large-scale popularization: the second phase of the 17 kilometer rainwater and sewage diversion project in Xiong'an New Area has applied 27000 sets of recyclable pipe fittings throughout the entire section, reducing a total of 212 tons of carbon directly and planting 12000 equivalent trees; Since this year, 32000 sets of new pipe fittings have been installed in the old water supply pipe network transformation project in Shanghai center central urban area, the construction efficiency has increased by 35% compared with the traditional welding process, and there is no welding fume emission in the whole process; In the water supply improvement projects of urban villages in Guangzhou, Shenzhen and other places, the penetration rate of such pipe fittings has exceeded 60%.
Previously, people were concerned about the high cost of recyclable pipe fittings. Now, with the completion of capacity ramp up by leading domestic pipe companies, the selling price of such products has decreased by 27% compared to 2022, only 4.8% higher than traditional cast iron pipe fittings. Coupled with the subsidy policies for green municipal procurement in various regions, the economic feasibility has been fully realized. "The head of the leading domestic pipe industry revealed at the promotion meeting that the annual production capacity of recyclable pipe fittings in China has exceeded 1.8 million sets, which can fully meet the incremental demand for municipal pipe network renovation in various regions.
The relevant person in charge of the Zhongcheng Water Association stated that during the 14th Five Year Plan period, more than 22000 kilometers of old water supply and drainage pipelines will be renovated nationwide. If the penetration rate of new recyclable low-carbon pipe fittings is increased to 30%, carbon reduction of over 220000 tons can be achieved annually, which is equivalent to shutting down three 10 MW coal-fired power units. At present, 17 provinces in China have included such low-carbon pipe fittings in the priority catalog for green procurement of municipal engineering. In the future, carbon emission accounting standards for the entire life cycle of pipeline networks will be gradually introduced to further promote the large-scale implementation of green pipeline network technology and help achieve the goal of "waste free city" construction.
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