New Nitrogen Pipeline for the University Hospital Bern
Jan 12, 2016
Founded in 1534, the “Inselspital” hospital in the city of Bern today is one of the most prominent University Hospitals in Switzerland and an internationally renowned centre for high-tech medical science. The premises in the western part of the city include several buildings accommodating numerous highly specialised clinics where round about 40.000 inpatients and 520.000 outpatients are treated per year.
Liquid nitrogen, as a medical application, is used for freezing tissue and cells at temperatures as low as -196 °C, the so-called "cryopreservation". For the new pipeline a vacuum-insulated pipe with an outer diameter of 63 mm, which could bear up against these sub-zero temperatures, was to be installed inside a protection pipe PE NW 280 S8.
The 70 m long bore path on the clinic premises, densely covered with buildings, took its course past the hospital chapel and into a ventilation room in the basement of the INO building. Due the very confined space in the launch area, a 2.50 m high earth dam between the building and the fuel depot was chosen as the starting place for the drill rig by the parties involved. In order to avoid damage to the existing pipelines inside the building the bore into the 3 m deep storage room had to maintain a target precision of +/- 20 cm horizontally as well as vertically. All in all, this was just the right job for the experienced drilling crew of the pipe laying experts Zemp.
The pilot bore, reaching a depth of up to 6.50 m, caused no problems. On arrival at the target a core hole of 450 mm in diameter was drilled through the wall of the building into the ventilation room to allow pulling the backreamer of Ø 400 mm in. One single reaming operation was sufficient to pull the new pressure pipeline through the bore path. As the basement offered very little space the single pipe segments were no longer than 2.50 m and had to be welded together in situ to form 12.50 m long pipe strings. During the process of pulling in such a previously prepared pipe string was welded on every 12.50 m.
The drilling mud was collected in a 500 l basin at the target point in the basement, from where it was pumped into a pit in the access area of the casualty department via a 60 m long line. The high share of gravel did nothing to make pumping any easier, but was not really a great drawback for the pipe pulling operation.
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