Objectif To build and operate a pre-insulated district heat transmission pipe system of ductile cast iron socket pipes with pressed-through passages and stilt supports. The expected advantages of such a system were the considerable cost savings during construction and the short installation time. The cast-iron pipes are connected with coupling sleeves as part of the Saar district heating distribution system. The innovative concept was expected to diminish corrosion and avoid the need for expensive welding and heat compensation measures at the weld.The installation of 4.4 km was completed at the end of September 1986. After a successful pressure test the line was commissioned in October 1986.The aim of lowering low laying costs and shortening of the assembly time was achieved.In the operation the system could not meet the stipulated requirements. Considerable damages to the insulation material and the sleeves led to a drastic reduction in life expectancy. Parts of the pipes have to be replaced in the near future.The installed control and monitoring system operated satisfactorily.The project concerns the installation of a district heating transmission line consisting of cast-iron socket pipes with pressed-through passages and stilt support. The new pre-insulated pipes were part of the new construction of the central transmission system Saar-West in Germany. The transmission pipes transport the heat from the place of heat generation at the "Dillinger Huette" in Dillingen to the city of Saarlouis. Other supply areas were connected to the central transmission system as well.The total length of the line is 4 km. 3.6 km of this are made up of cast-iron pipes of which 2.5 km are underground, 0.9 km are above ground on concrete pedestals, 0.175 km of this are pressed through passages under roads and 0.03 km are on a footbridge. The pipes are made of cast-iron and were therefore expected to be resistant to corrosion. They are insulated with polyurethane material and are couples with flexible gaskets which absorb the expansion forces. Therefore, the expensive andtime consuming welding with the addition of expansion compensating devices were not required.A pipeline monitoring system was installed along the entire length of the pipes. At defined intervals along the pipe hybrid modules were located 1 m from a socket connection.Nominal width : 500/300/250Nominal pressure : PN 25Operating temperatures : 130 deg. C. Programme(s) ENG-ENALT 2C - Programme (EEC) of demonstration projects relating to the exploitation of alternative energy sources and to energy saving and the substitution of hydrocarbons, 1983-1985 Thème(s) 2.2 - HEAT Appel à propositions Data not available Régime de financement DEM - Demonstration contracts Coordinateur FERNWAERME-VERBUNG SAAR GMBH Contribution de l’UE Aucune donnée Adresse BISMARCKSTRABE 11 6620 VÖLKLINGEN Allemagne Voir sur la carte Coût total Aucune donnée
