At a hydrogen filling station in Germany, the use of a coolant classified as hazardous to water placed particular demands on the pipework. A double-walled pipe system was therefore installed to ensure the protected supply of coolant to the hydrogen dispensers.
When vehicles are refuelled with hydrogen at pressures of up to 700 bar, the hydrogen heats up considerably during rapid filling. Reliable cooling of the dispensers is therefore essential for a safe and efficient refuelling process. However, the coolant used, Dynalene HC, is classified as hazardous to water, requiring the pipework to be designed with appropriate protection.
The FLEXWELL safety pipe (FSR) from BRUGG Pipes was selected for this application. The double-walled pipe system enables the controlled and protected conveyance of the coolant. Two pipe sections, each approximately 50 metres long, were installed in dimension FSR 48/71. The pipes were laid in a concrete channel providing additional mechanical protection.
In addition to supplying the pipe system, BRUGG Pipes carried out the laying and installation work on site. Subsequent insulation was completed by a specialised subcontractor. Construction work was completed in approximately three weeks.
The project demonstrates how a double-walled pipe system can meet the specific safety requirements associated with cooling hydrogen filling stations.