In some implementations, an apparatus includes a container having an exterior surface, having an interior surface and having a defect, a gasket positioned over the defect in the container, the gasket having a length, a width and a depth, a rigid patch positioned over the gasket, a plurality of pairs of studs and nuts positioned near the outer perimeter of the rigid patch, the studs being friction welded to the exterior of the container.

A method for sealing a junction with a contact surface and counter-contact surface of an element of a compartment of a gas-insulated substation includes an injection of a sealing product into an inter-seal volume formed between the contact surface and counter-contact surface by using a leakage recovery duct opening into the inter-seal volume. During injection, the sealing product is in the form of a liquid whose kinematic viscosity, measured at 40 C. under 1 atm, is greater than or equal to 3000 mm2/s. Injection is carried out under pressure by a plurality of successive increases in injection pressure until any residual gas is expelled from the inter-seal volume by pressurized leakage of this residual gas via at least one of the two mechanical seals.

In some implementations, an apparatus includes a curved portion of a storage tank having an exterior surface, having an interior surface and having a defect, the apparatus also includes a steel patch positioned over the curved portion of a storage tank, a plurality of studs and nuts positioned near an outer perimeter of the steel patch, in which the plurality of studs being friction welded to the exterior surface of the curved portion of a storage tank.

A method for sealing a junction with a contact surface and counter-contact surface of an element of a compartment of a gas-insulated substation includes injecting a sealing product into an inter-seal volume formed between the contact surface and counter-contact surface by using a leakage recovery duct opening into the inter-seal volume. Prior to injection, a vent duct different from the leakage recovery duct is drilled from the outside of the compartment into the inter-seal volume. During injection, the sealing product is injected under pressure into the inter-seal volume until it fills it, then exits through the vent duct.

In some implementations, an apparatus includes a container having an exterior surface, having an interior surface and having a defect, a gasket positioned over the defect in the container, the gasket having a length, a width and a depth, a rigid patch positioned over the gasket, a plurality of pairs of studs and nuts positioned near the outer perimeter of the rigid patch, the studs being friction welded to the exterior of the container.

In some implementations, an injection system that injects sealant into a pipe, pressure component or valve while containing the pipe, pressure component or valve repair that significantly reduces or eliminates release of hazardous material from inside the pipe, pressure component valve or injection system and thus significantly reduces emission of the hazardous material from inside the pipe, pressure component or valve into the environment and protecting the repair technicians.

In some implementations, an injection system that injects sealant into a pipe, pressure component or valve while containing the pipe, pressure component or valve repair that significantly reduces or eliminates release of hazardous material from inside the pipe, pressure component valve or injection system and thus significantly reduces emission of the hazardous material from inside the pipe, pressure component or valve into the environment and protecting the repair technicians.

A method for sealing a junction with a contact surface and counter-contact surface of an element of a compartment of a gas-insulated substation includes an injection of a sealing product into an inter-seal volume formed between the contact surface and counter-contact surface by using a leakage recovery duct opening into the inter-seal volume. During injection, the sealing product is in the form of a liquid whose kinematic viscosity, measured at 40 C. under 1 atm, is greater than or equal to 3000 mm2/s. Injection is carried out under pressure by a plurality of successive increases in injection pressure until any residual gas is expelled from the inter-seal volume by pressurized leakage of this residual gas via at least one of the two mechanical seals.

Heat resistant systems provide a self-activating insulative solution. A seal system includes a case defining a joining line where two sections of the case join together. The case envelops an internal space and separates the internal space from an external space. A seal is disposed at the joining line and a case extension defines a cavity on an outside of the seal. The case extension has an opening that extends between the cavity and the external space. A lining of a heat responsive material is provided in the case extension. The material expands to an activated state when exposed to heat above a threshold temperature and passes through the opening encapsulating the case extension and insulating the seal from the external space.