| 摘要 |
<p>A sub-surface pipe is assembled from a series of sleeve-fit sections (1,3) with a rubber seal (6). During assembly the interface between the inserted pipe (3) and seal (6) is lubricated by the application of especially an oil lubricant spray in which it is distributed by grooves (13). The oil spray is discharged from a hand-held can in which the propellant gas is e.g. propane or butane.</p> |
