1) Bidirectional sealing system for the outlet of a plastic-lined compressed gas cylinder:
A sealing system for the outlet of a polymer lined compressed gas cylinder forms the subject of this patent. The polymer liner outlet extends into the bore of a boss. An insert engages with the bore and a secondary angled seal, forming two primary seals between the insert and portion of the liner outlet.
The first seal is an O-ring, oriented in the radial direction, whilst the second one is an angled seal, or beveled conical seal of the polymer liner that is compressed between the metal components of the polar boss and the insert. The use of a seal oriented in two directions compresses the polymer liner in different directions to prevent any possibility of gas leakage and/ or seal extrusion under pressure. The angled seal surface prevents any reverse extrusion of the primary seal that might occur during cold temperatures or during repeated pressure cycles in long-term service.
2) Line blind valve assembly with an injection sealing system
A blind valve assembly for use in a piping circuit is discussed. It includes a blind element and an injection system. The blind element has a planar portion that is transversely mounted in the piping circuit in order to block the flow of a fluid. When the blind element is installed, it has one or more flat surfaces that are in sealing contact with another component of the piping circuit, such as a flange face, in order to define a sealing interface.
A primary seal is provided between the blind element and the other components of the piping circuit and circumscribes at least a portion of the sealing interface. The injection system is connected to the sealing interface. It selectively injects a sealant material into the sealing interface to form a redundant seal in the sealing interface and around the primary seal. A fitting for injecting the sealant material is mounted on the flange.
3) Seal made from PTFE and a filler
The seal described consists of a jacket that includes an annular body defining a central axis and a recess extending into the annular body, concentric to the central axis. The jacket is made from at least 30 wt% of polytetrafluoroethylene (PTFE) and at least 10 wt% of filler material. The latter contains boron, nitrogen, titanium and silicon; carbon fiber and glass fiber (or a combination of these). An energizing element is disposed in the recess.
4) Seal swell agents for lubricating compositions
The disclosed technology relates to compounds that are useful as seal swell agents in lubricant compositions. Also discussed are lubricating compositions and concentrates that comprise the seal swell agents and the use of such lubricating compositions and concentrates. The invention relates to an agent that is a substituted sulfonyldibenzene compound. The substituents on the benzene rings may be hydrocarbyl groups of 4–20 carbon atoms or alkylene groups of 1–2 carbon atoms with further functional groups.
5) Continuous circulating sub connection system
This patent describes a continuous circulation system and a connection assembly for establishing a threaded fluid seal to a side port of what is termed a “continuous circulating sub”. The connection assembly has independently rotatable and movable first and second engagement mechanisms.
The first of these includes first and second wrenches for engaging a pressure tap, checking pressure, and removing and reinstalling a safety plug. The second mechanism includes an adapter pipe for creating a threaded seal with the side port, thereby allowing a reliable high-pressure flow. The connection assembly automates the steps of checking pressure within the sub, between the radial valve and safety plug, removing the safety plug, screwing the threaded adapter pipe into the side port, providing a flow path for drilling fluid, disengaging the threaded adapter pipe, replacing the safety plug and returning the continuous circulation sub to its original operational state.
6) Dry gas seal cooling arrangement
Dry gas seals are increasingly used as shaft seals in turbo-machines – for example, centrifugal compressors – because they offer several advantages over other sealing arrangements. One aspect of this patent deals with a shaft seal arrangement for a rotating turbo-machine shaft that has a rotating axis. The arrangement described comprises a rotor part, which rotates during operation, and a stationary part.
The dry gas seal may include at least one rotary element, for example, a rotary ring, with a rotary sealing surface and is arranged for rotation with the rotor part; and at least one stationary element, in the shape of a rotary ring, in a fixed relationship with the stationary part and having a stationary sealing surface. The rotary stationary sealing surfaces are resiliently biased one against the other. A dry gas channel is provided and configured for delivering dry sealing gas between the stationary and rotary sealing surfaces. Furthermore, the shaft seal arrangement also includes a volume arranged to receive a cooling fluid and is in a “heat-exchange relationship” with the dry gas seal, and a venting arrangement, configured to collectively vent exhaust cooling fluid and dry sealing gas from the shaft seal arrangement. Another aspect considers a turbo-machine system that comprises a casing and a shaft arranged for rotation in the casing, on which a rotary member is mounted for co-rotation with the shaft. A working fluid is processed through the turbomachine and the shaft seal arrangement described prevents working fluid leakages along the shaft.