Abstract: A degradable plug device for a pipe has an outer plug body and an inner plug for preventing fluid flow through the pipe until the inner plug has been removed from the outer plug body. The outer plug body and the inner plug are of a degradable material. The inner plug has a chamber with at least one port to the exterior of the inner plug. The exposed surfaces of the degradable plug have a protective layer thereon. The inner plug is disposable in at least a first position, in which the inner plug prevents the fluid flow through the pipe. The inner plug is adapted to undergo, in use, a degradation initiation operation such that fluid is able to enter the chamber via the at least one port to initiate corrosion or dissolution of the inner plug from inside the chamber.

Abstract: A degradable plug device for a pipe has an outer plug body and an inner plug for preventing fluid flow through the pipe until the inner plug has been removed from the outer plug body. The outer plug body and the inner plug are of a degradable material. The inner plug has a chamber with at least one port to the exterior of the inner plug. The exposed surfaces of the degradable plug have a protective layer thereon. The inner plug is disposable in at least a first position, in which the inner plug prevents the fluid flow through the pipe. The inner plug is adapted to undergo, in use, a degradation initiation operation such that fluid is able to enter the chamber via the at least one port to initiate corrosion or dissolution of the inner plug from inside the chamber.

Abstract: A degradable plug device for a pipe has an outer plug body and an inner plug for preventing fluid flow through the pipe until the inner plug has been removed from the outer plug body. The outer plug body and the inner plug are of a degradable material. The inner plug has a chamber with at least one port to the exterior of the inner plug. The exposed surfaces of the degradable plug have a protective layer thereon. The inner plug is disposable in at least a first position, in which the inner plug prevents the fluid flow through the pipe. The inner plug is adapted to undergo, in use, a degradation initiation operation such that fluid is able to enter the chamber via the at least one port to initiate corrosion or dissolution of the inner plug from inside the chamber.

Abstract: The invention relates to a degradable plug device (12, 13, 41, 110, 140) for a pipe (10). The plug device has an outer plug body (16) and an inner plug (14) for preventing fluid flow through the pipe (10) until it or a part thereof has been removed from the outer plug body (16). The outer plug body 16 ( ) and the inner plug (14) are formed of a degradable material, such as magnesium. The inner plug (14) has a chamber (22) with a port (24) to the exterior of the inner plug (14). The exposed surfaces of the degradable plug (12, 13, 41) have a protective layer thereon. The inner plug (14) is disposable in at least a first position, in which the inner plug (14) prevents said fluid flow through the pipe (10), and is adapted to undergo, in use, a degradation initiation operation, such that fluid is able to enter the chamber (22) to initiate corrosion or dissolution of the inner plug (14) from inside the chamber (22).