| 摘要 |
<p>A tube (10) for pneumatic transport of wearing material, for example crushed glass, sand, dolomite or basalt, consists of an outer casing (12) at the inside being covered with a wearing layer (14). Said wearing layer comprises a cast composition including crush glass and binder, preferably in the form of epoxy resin, in which composition there is moulded one or more electrical lines (16). Said electrical lines are connectable in a corresponding signal line having indicating means intended to enable indication of breaks of electrical lines at predetermined tube wearing. Also is disclosed a tube system comprising several tubes of the kind indicated above enabling indication and identification of breaks of electrical lines in a corresponding tube.</p> |
