An exhaust conduit for a cargo vessel. The exhaust conduit is a flexible conduit with a first upstream opening adapted to engage with an exhaust structure and a second downstream opening for exhausted air. The exhaust conduit is inflatable due to the passage of exhausted air and the downstream opening is of smaller cross-sectional area than the upstream opening. The downstream opening is of adjustable cross-sectional area. In a system for fumigating a RORO vessel, the inflatable exhaust is inflatable to a height exceeding the height of the accomodation block. In a method of fumigating a RORO vessel, the method includes providing a temporary flexible exhaust for exhausting fumigant from the cargo area, and/or providing an inflatable exhaust for exhausting fumigant from the cargo area.

A methods and systems of fumigating a vessel include delivering fumigant to a cargo area of the vessel. In particular, the vessel may be a roll-on/roll-off vessel. In such a system, an air pressure system is provided for maintaining a selected minimum pressure differential between a selected area of the vessel above the cargo area and the cargo area, such that pressure of the selected area is greater than the cargo area. A control system may maintain the pressure differential.

A methods and systems of fumigating a vessel include delivering fumigant to a cargo area of the vessel. In particular, the vessel may be a roll-on/roll-off vessel. In such a system, an air pressure system is provided for maintaining a selected minimum pressure differential between a selected area of the vessel above the cargo area and the cargo area, such that pressure of the selected area is greater than the cargo area. A control system may maintain the pressure differential.

A temporary hatch insert facilitating void space servicing wherein the hatch insert is sized to be received in a given hatch opening and will support a person walking across the insert in the hatch opening, and wherein the hatch insert includes a plurality of openings for venting or ventilation of the void space during servicing of the same. A fan or blower mount may be secured below the hatch insert to facilitate venting of the void space.

A temporary hatch insert facilitating void space servicing wherein the hatch insert is sized to be received in a given hatch opening and will support a person walking across the insert in the hatch opening, and wherein the hatch insert includes a plurality of openings for venting or ventilation of the void space during servicing of the same. A fan or blower mount may be secured below the hatch insert to facilitate venting of the void space.

Provided herein are methods of drawing out oils and/or fats (e.g., hydrocarbons) from a solid material (such as, e.g., metal or rock, e.g., a hydrocarbon bearing geologic formation). The methods comprise fumigating the solid material with a gas containing chlorine dioxide, thereby drawing out oil and/or fat from the solid material. The methods can be used, e.g., to clean solid materials used in industry and to enhance the recovery of crude oil and/or natural gas from petroleum wells.