2. Ensure the production process respects the environmen- tal impact and ensures the upstream transport of the products has the lowest possible carbon footprint. The most critical elements of ensuring this are: Electrification of the production and internal transport
network can also forward information other than the alarm measurements, such as water level in wells or oth- er critical champers, temperature, pressure, and flow. c) Transmitting information via the cu alarm wires embed- ded in the PUR foam. It is even possible to embed a sepa- rate wire for separate information for all kinds of characters. d) Quality assurance of the casing joint installation The documentation and quality control for installing cas- ing joints must be digitized. The sense and possibility to incorporate the collected digitized data into a GIS sys- tem should be investigated for a fully integrated quality system of the casing joint installation. e) District heating stakeholders should have the possibility to access calculation programs online. Manufacturers of pre-insulated pipes for district energy should offer this service on their website. It should allow the calculation of optimized dimensions of the steel carrier pipe and the insulation series. 5. Produce products that can transport energy with the lowest possible environmental impact. The heat loss of a district heating network causes a consid- erable CO2 footprint, and it is imperative to focus on its re- duction in the network. This can be done in many ways, and choosing the right pipe system is crucial. If comparing the heat loss of a single pipe to a double pipe, the choice seems obvious. The below figures show the sav- ings in heat loss for dimensions ø88,9 to ø219,1 series 2 sin- gle and double pipe is between 36% - 52% Conclusion: Many relevant aspects must be considered to choose the right pipe network for the next generation. The quality of the pipe system with an optimum service life is essential. A long service life ensures the operating costs and protection of the environ- ment. Buying EHP-certified products, ensuring all products ful- fill EN13941, buying from an ISO 9001-certified manufacturer, and ensuring a correct static design of the pipe network as- sures all this. In addition to quality, environmental aspects must be considered. Besides the carbon footprint of the product, the production process and transportation of the feedstock and finished products must be analyzed, as the environmental im- pact within the production process, such as handling of chem- icals and waste.
Heating coming from sustainable local suppliers Increase transport by train whenever possible Fulfillment of the ISO 14001 certification
The initiatives mentioned above must be an aim for the en- tire industry. The more that is accomplished in this regard, the more focus can be placed on downstream supply chain efforts to develop and deliver sustainable products. 3. Secure that the products are recycled for the right purposes. Besides enabling the usage of recycled feedstock, recycling the pre-insulated pipe systems after their lifetime must be improved. What are the recycling possibilities for the com- ponents of pre-insulated pipes? PUR foam Both manufacturers of pre-insulated pipe systems and sup- pliers of the feedstock for foam are researching the possi- bilities of recycling the PUR foam of the pre-insulated pipes after the end of its lifetime, so far without a breakthrough solution for full-scale production. PE outer casing To ensure the quality and lifetime of the PE and in accord- ance with EN253, only non-degraded rework from the man- ufacturers’ own production process can be recycled and lead back to the new PE outer casing production. With a constant demand increase for sustainable prod- ucts, recycled PE from the manufacturers’ own production doesn’t fulfill the market demand, and the overall availabili- ty of feedstock from recycled PE is decreasing. The introduced more sustainable concept meets these requirements without compromising the EN253, and the availability of feedstock for plant-based waste materials is not challenged either, according to the suppliers. Steel pipe Steel accounts for the largest carbon footprint contribution in producing pre-insulated pipe systems. EN13941-1 regu- lates the quality of the steel pipes needing to be graded P235GH. Many steel mills already provide the market with pipes of steel grade P235GH with a considerable amount of recycled steel. Still, there should be a way to reduce the carbon footprint. The steel pipe manufacturing industry must focus on elec- trifying its production operations, ensuring a sustainable power source. 4. Focus on digitalization wherever possible. To support digitalization within the industry, the possibili- ties, among others, are: a) Alarm systems for surveying the network condition con- cerning if there is a leakage on either the PE outer casing or the steel carrier pipe. b) Transmitting information from alarm boxes via the GSM network. Alarm boxes sending information via the GSM
For further information please contact: Jens Rasmussen, j.rasmussen@isoplus.dk
Dimension steel ød mm
Heat loss single pipe W/m trench
Heat loss double pipe W/m trench
Savings heat loss W/m trench
Savings heat loss in %
88,9
34,8
22,1
12,7
36
139,7
42,3
20,5
21,8
52
219,1
50,2
25,3
24,9
50
Pre-assumptions: Flow temperature = 110°C Return temperature = 80°C Soil temperature = 8°C Normal soil conditions Soil covers 800 mm
λ 50 Values of the PUR foam = 0,025 W/mK (new value) 1% saved kW means saving 1% of the CO2 emission, no matter what fuel is used for the boiler.
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