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.
What we supply for it
Every part to your drawing, with material certificate and documentation.
Pipe spools (prefabricated piping assemblies) are piping sections…
Headers bring steam, water or gas together and distribute it again. We…
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
Pressure vessels, collecting and buffer vessels, separators and…
Typical materials
The grade follows medium, temperature and pressure. The list below is a selection, not a limitation – we supply the grade that design and specification call for. 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.
Send your drawing – we will clarify the rest together
A drawing, bill of materials or short description is enough to get started. If already available, the following details help us prepare your quotation quickly.
- Isometric or route plan; for substations the scheme
- Flow and return temperature, network pressure and pressure rating
- Nominal sizes, EN 253 pre-insulated or bare, degree of prefabrication
- Number of spools or transfer stations
- Certificate 3.1 or 3.2, date and delivery address
District heating supply
Tell us what it is about – plant, medium, temperature. We come back with a proposal, a price and a date.