| 摘要 |
<p>The invention relates to total elimination of aqueous deposits in pipelines intended for transporting gaseous fluids, such as a natural gas. The method involves sending, by a nozzle at an end of at least one compressed air ejector, connected with the pipeline, a pressurized driving fluid (for example, under 4 to 8 bars) into a pipeline which aspirates and entrains the gaseous fluid (air+water vapor), the mixture of fluids then being discharged at the other end of the ejector. In practice, multistage ejectors for example three ejectors in series, are used. According to a variant of the method, the step of putting gas which is to be transported into the pipeline is done while the vacuum is maintained in the ejector or ejectors so as always to be outside the limits of flammability of this gas. The method is particularly suitable for drying natural gas pipelines and then putting the pipelines under pressure.</p> |
