Abstract: Systems, methods, and devices for relieving overpressure associated with thermal expansion of fluid within a closed cavity of a subsea manifold assembly. The subsea manifold assembly may comprise a header bore fluidly connected to one or more branch connections. A unidirectional valve is included at the branch connections to allow fluid leakage from the closed cavity into a header bore of the subsea manifold assembly to thereby reduce a pressure within the cavity while in the closed position.

Abstract: Systems, methods, and devices for compensating overpressure associated with thermal expansion of fluid within a closed cavity of a subsea manifold assembly. At least one piston assembly may be included and selectively fluidly connected to the closed cavity to counteract or reduce a pressure produced within the closed cavity.

Abstract: Systems, methods, and devices for relieving overpressure associated with thermal expansion of fluid within a closed cavity of a subsea manifold assembly. The subsea manifold assembly may comprise a header bore fluidly connected to one or more branch connections. A unidirectional valve is included at the branch connections to allow fluid leakage from the closed cavity into a header bore of the subsea manifold assembly to thereby reduce a pressure within the cavity while in the closed position.

Abstract: A valve block may be provided with a plurality of flow bores within a body the valve block. In addition, valve block may have a plurality of openings opening at an outer surface of the valve block and in fluid communication with the plurality of flow bores. Further, a blind plug may be within at least one of the openings. The blind may include a cap coupled to an inner surface of the at least one opening and a plug having a first end face in contact with the cap and a second end face extending into the flow bore. Furthermore, the blind plug may seal the at least one opening from a surrounding environment.

Abstract: A valve block may be provided with a plurality of flow bores within a body the valve block. In addition, valve block may have a plurality of openings opening at an outer surface of the valve block and in fluid communication with the plurality of flow bores. Further, a blind plug may be within at least one of the openings. The blind may include a cap coupled to an inner surface of the at least one opening and a plug having a first end face in contact with the cap and a second end face extending into the flow bore. Furthermore, the blind plug may seal the at least one opening from a surrounding environment.