Patent ID: 8814220
Filing Date: 2014-08-26
Classification: F16L

Abstract:
1. Pressure regulation system for a high pressure swivel, comprising an annular inner wall and an annular outer wall, rotatable relative to one another around an axis defining an axial direction, the walls defining a toroidal chamber, the walls further defining a gap extending axially between the walls from the toroidal chamber to an outer part of the high pressure swivel, wherein the system further comprises, positioned in the gap in axial succession along a flow direction from the toroidal chamber to the outer part: an isolation seal adjacent the toroidal chamber, an isolation gap section, a primary seal, a primary gap section, and a secondary seal, a first pressure control unit being connected to the toroidal chamber and to a pressurization device coupled to the isolation gap section and being configured to supply fluid to the isolation gap section from the pressurization device when a pressure in the toroidal chamber rises and to vent fluid from the isolation gap section when the pressure in the chamber drops, thereby to maintain a pressure in the isolation gap section at a substantially constant value above a pressure in the toroidal chamber.