District heating
In a heat network expansion and tightness are the real subjects, not pressure. We supply pipe, spools and components for generation, network and transfer – to drawing and with evidence.
Why thermal expansion governs the design
A district heating line is heated up and cools down again – every day. Steel expands by about 1.2 mm per metre and 100 kelvin; over 100 metres of route that is a good 10 centimetres. The line has to be able to take this movement, through expansion legs, bellows or cold pull. Where it is restrained, forces arise that overload anchors and connections. In a heat network, therefore, more hangs on routing and anchor points than on the pressure rating.
What we supply for it
Every part to your drawing, with material certificate and documentation.
Prefabricated piping sections to your drawing or isometric
Headers collect and distribute steam or water in the boiler and in the…
Bent tube runs that take up or give off heat
The plate in which the boiler tubes end
Boiler tubes rarely arrive on site in mill lengths. We supply them…
The gas-tight wall of the furnace
Typical materials
The grade follows medium, temperature and pressure. A data sheet exists for every grade.
Standards and codes
| Area | Code |
|---|---|
| Industrial piping | EN 13480 for generation and station equipment |
| District heating pipes | EN 13941 for buried pre-insulated systems |
| Pre-insulated pipe | EN 253 service pipe, insulation and casing |
| Materials | EN 10216-1/-2 seamless, EN 10217-1/-2 welded |
| Flanges | EN 1092-1, PN 16 or PN 25 depending on the network |
| Welding | EN ISO 3834-2, procedures to EN ISO 15614-1 |
Typical tasks
Generation and boiler house
From boiler to manifold: headers, coils and spools to drawing, matched to the existing plant.
Network and route
Prefabricated spools shorten construction time in the trench or duct – exactly where every hour is expensive and the window is tight.
Transfer station
Compact assemblies with isolation, metering and connections, prefabricated and tested instead of welded together on site.
Extension of an existing network
When connecting new customers the as-built records are rarely accurate. Site measurement prevents a finished spool from not fitting.
District heating – frequently asked questions
Which pressure rating does a heat network need?
PN 16 and PN 25 are typical, depending on network pressure and height differences across the supply area. The operator’s design governs, not a rule of thumb – and it belongs in the enquiry together with the flow temperature.
How much does a steel line expand?
About 1.2 mm per metre and 100 kelvin of temperature difference. Over 100 metres of route and 100 K that is some 12 centimetres. The route has to absorb this movement – otherwise the forces travel into anchors and connections.
Do you also supply pre-insulated pipe to EN 253?
Pre-insulated systems are a product of their own with their own standard. We supply the service pipe, spools and fittings for generation and stations; for the buried network we clarify case by case what sensibly runs through us and what comes directly from the system supplier.
Why prefabricate instead of welding on site?
Because welding in a trench or chamber is slower and poorer than in the shop – fixed positions, wet, cold. Every weld made beforehand saves construction time and is easier to test.
What do you need for a quotation?
Flow and return temperature, network pressure and pressure rating, nominal sizes, drawing or isometric, number of spools or stations, date and the required certificate to EN 10204.
District heating supply
Tell us what it is about – plant, medium, temperature. We come back with a proposal, a price and a date.