| 摘要 |
In the case of a pipe system, which consists of two or more concentric pipes of which at least two adjacent pipes enclose an annular space which is subject to a vacuum for the transportation or for holding cryogenic fluids or gases, for example a superconductor, a liquid-gas line or the like, a means which absorbs residual gases and is in the form of a chemical getter is arranged in the space. For improved extraction of the residual gases and for simpler arrangement of the getter material, the chemical getter material is arranged in pill form or tablet form together with a granular material, which adsorbs residual gases and has a large surface, for example activated charcoal, zeolite etc., in a gas-permeable container 6 (Figure 1). <IMAGE>
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