The European standard “EN 448 District heating pipes - Bonded single-pipe systems for directly buried hot water networks - Factory-made connection assemblies consisting of steel service pipes, polyurethane thermal insulation and a polyethylene casing” describes the requirements and test methods for factory-made thermally insulated bonded connection assemblies for hot water networks in accordance with EN 13941-1. This assembly consists of a steel service connection, rigid polyurethane foam thermal insulation and a polyethylene casing. The connection assemblies may also include the following additional elements: test leads, spacers and diffusion barriers. This standard covers the following connection assemblies: elbows, tees, reducers, disposable expansion joints and anchors. This standard applies to connection assemblies with a minimum design pressure of 1,6 MPa (overpressure).
For the purposes of this standard, the terms and definitions given in “EN 17248 District heating and district cooling piping systems - Terms and definitions” apply.
The materials used in connecting steel components are certified according to EN 10204. If the end user requires traceability on the material, this must be specified at the time of ordering. If so, the relevant material certificates will be delivered to the end user.
Steel grades are specified in EN 13941-1. All steel pipes and components used in the manufacture of pipe assemblies covered by this standard must be provided to the manufacturer with an inspection certificate in accordance with EN 10204, at least. This inspection certificate must be provided to the customer upon request. If the customer ordering the connecting assemblies requests a material inspection certificate in accordance with EN 10204, this request must be submitted to the connecting assemblies manufacturer at the time the order is placed. Subsequent requests for such documentation may be too late and may not be met by the manufacturer, as the manufacturer must arrange for the certification to be assigned to the pipes and pipe sections before production begins.
For the purposes of this standard, all components must be designed for a minimum of 1,6 MPa. If fitting assemblies are to be used in applications where pressures greater than 1,6 MPa are present, additional calculations will be necessary. The minimum nominal wall thickness of all components before processing must be at least the same as for service pipes in accordance with EN 253. The tolerances on the nominal diameter, outside diameter, diameter of the pipe ends and the wall thickness must be the same as for service pipes in accordance with EN 253. Depending on design considerations, wall thicknesses other than those given in EN 253 may be used, but in no case shall they be less than the minimum specified in EN 253. All components must be designed in accordance with EN 13941-1 for the actions and stresses normally occurring during the service life of the fitting assembly or component.
In short, the EN 448 standard specifies the requirements and test methods for pre-insulated fittings used in district heating networks, in particular those having:
This standard covers factory-made fittings such as:
These are used in pre-insulated pipe systems carrying hot water or steam in district heating and cooling systems.
What are the following characteristics defined in this standard?
This standard is primarily used by manufacturers, engineers, and contractors involved in district heating and cooling infrastructure. It is also relied upon by energy distribution infrastructure, municipalities, energy companies, large residential complexes, and industrial facilities.
Several test methods defined in the EN 448 standard are applied to verify the mechanical, thermal, and adhesion performance of pre-insulated connecting elements (e.g., elbows and tees). Some of these tests include:
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