DEWATERING METHOD OF CAVITY OF SUBAQUEOUS SECTION OF CROSS-COUNTRY GAS PIPELINE AFTER HYDRAULIC TESTING Russian patent published in 2009 - IPC F26B7/00 F26B5/04 

FIELD: construction, pipeline.

SUBSTANCE: invention pertains to gas transporting along the cross-country gas pipeline and may be employed in construction of subaqueous sections of cross country gas pipelines after hydraulic tests for dewatering. The method differs by the fact that, during the process of dewatering its parameters characterising operation of pumping out vacuum units, are compared with their targeted tolerances, and balance between the amount of evaporated moisture and moisture pumped out from the subaqueous section is set, should dewatering parameters deviate from the targeted tolerances - productivity of the pumping out vacuum units is adjusted and further dewatering of the cavity of the subaqueous section of the cross-country gas pipeline simultaneously with vacuuming is conducted by nitrogen purging reaching specified (design) humidity value.

EFFECT: reaching specified speed of water evaporation in vacuum environment and steam evacuation from the cavity of subaqueous section of cross - country gas pipeline.

3 cl, 3 dwg