UNDERWATER PIPELINE Russian patent published in 2015 - IPC F16L1/16 F16L7/00 

FIELD: construction.

SUBSTANCE: underwater pipeline of a pipe-in-pipe type for passage through a water obstacle includes a cylindrical casing ballasted at the bottom and provided with end faces taken beyond coastal water protection zones and a pressure product line routed inside it. In a near-bottom section, the product line is laid on wedge-like antifriction pads with a gap above the lower generatrix of the inner casing surface, and in coastal sections, it is mounted coaxially to it, thus forming a variable inter-pipe space as to the shape. The underwater part of the inter-pipe space is filled with water or an anti-freezing agent, and coastal sections are free from liquid and interconnected with atmosphere by means of vent pipes provided on the casing at its end faces. Between the end faces of the external casing and the internal product line there tightly fixed are conical elastic bellows. The underwater pipeline on both shores is provided with gas analysers of the inter-pipe space and indicators of liquid level in it. On the lower shore of the water obstacle there can be performed drainage of liquid from the inter-pipe space to an emergency tank.

EFFECT: reducing manufacturing costs and improving ecological safety of pipeline transition.

7 cl, 8 dwg