摘要:
In a leak test of an LNG tank by filling water, corrosion is prevented even if corrosive water such as sea water or filthy water is used, and the dissolution of zinc in water is restrained. A zinc-containing paint (18) is applied or a tape having a zinc-containing layer on the surface thereof is affixed to the surface of a weld zone (16, 14) of an inner wall (12) of the LNG tank, and corrosive water including sea water or filthy water is introduced into the LNG tank in the state in which the zinc-containing paint (18) or the zinc-containing layer forms the surface of the weld zone. The LNG tank is filled with the corrosive water, and after a predetermined period of time has elapsed, the corrosive water is discharged from the LNG tank. In the case where the tape having a zinc-containing layer on the surface thereof is affixed, the tape is taken off, and then a flaw in the inner wall of LNG tank is detected.
摘要:
The invention relates to a fibre-reinforced pressure vessel (1, 6) comprising a rigid gas- of fluid-tight body (2, 7, 13, 19) overwound with fibre filaments (3, 10,11, 18), whereby the fibre filaments are wound such that at least a number of fibre filaments can freely move with respect to one another and when the pressure vessel is under internal pressure the fibre filaments are loaded exactly in their longitudinal direction.The invention also relates to a method of manufacturing a fibre-reinforced pressure vessel whereby no matrix material (for example, resin) is used so that at least a number of fibre filaments would be incorporated in a matrix for that section of the pressure vessel in which the fibre filaments can freely move with respect to one another.
摘要:
A system is disclosed for the manufacture and use of a composite reinforced gas transport module (“GTM”). A metal shell of the system is wrapped circumferentially with a composite reinforcement, the composite reinforcement is post cured and the metal shell is then pressurized beyond the yield point of its material to load the composite reinforcement. The system is then brought to ambient temperature. The expansion deformation of the metal shell due to pressurization beyond the yield point results in a loading of the metal shell by the cured composite reinforcement at ambient temperature. Thus, a negative hoop stress condition is created in the metal shell at ambient to reduce the hoop stresses created during subsequent pressured operation.
摘要:
A transport unit includes a plurality of permanent magnets arranged to provide a magnetic holding field for protecting hyperpolarized gas during storage and/or transport. The permanent magnets are configured in a relatively light weight manner to project a substantially cylindrical magnetic holding field or spherical holding field in space. The magnet arrangements can include primary magnets and field shaping secondary magnets which act to enlarge the region of homogeneity. The permanent magnet arrangement can also be provided with a cylindrical shaped flex sheet magnetically activated to provide the magnetic holding field. The permanent magnet arrangements do not require disassembly to insert or remove one or more containers of hyperpolarized gas in or out of the transport unit.
摘要:
An impact and fire resistant coating laminate is provided which serves as an outer protective coating for a pressure vessel such as a composite overwrapped vessel with a metal lining. The laminate comprises a plurality of fibers (e.g., jute twine or other, stronger fibers) which are wound around the pressure vessel and an epoxy matrix resin for the fibers. The epoxy matrix resin including a plurality of microspheres containing a temperature responsive phase change material which changes phase in response to exposure thereof to a predetermined temperature increase so as to afford increased insulation and heat absorption.
摘要:
A steel-body vessel, suitable for storing ultra-high purity gases, has a relatively inert metal lining which covers the interior surface of the steel vessel body, preventing the stored gas from making any contact and reacting with the steel vessel body. The relatively inert metal lining extends into the vessel end pieces which are interiorly threaded, in the steel, proximate the relatively inert metal lining. The surface of the inert metal lining is conditioned to be smooth, preferably to 15 nullRa or better. The vessel end pieces are sealed with end closure devices, which are secured by a securing portion carrying exterior threads to matingly engage the interior threads on the vessel end pieces. The end closure devices contain a sealing portion constructed of the relatively inert metal, which retains an annular sealing gland to seal the vessel in a removable, non-contaminating manner at service pressures when the end closure device is seated within the vessel end piece by means of the securing portion.
摘要:
An apparatus for forming a polymeric pressure vessel includes two, coaxial plastic extruders separated by a hole-forming laser and connected to a variable die, a vacuum/blow molding apparatus, a fusing device, a braiding mechanism, and an overcoat applicator. The first extruder forms a tubular core, and the laser forms axially-spaced apertures in the core. The second extruder forms an outer tube coaxially over the tubular core and the variable die is alternately opened and closed to form parisons of increased material at axially-spaced locations along the outer tube. The parisons are moved into the molding apparatus and are expanded in a vacuum/blow molding process into hollow chambers of preferably ellipsoidal shape. The fusing device fuses the outer tube to the tubular core at locations between the spaced-apart hollow chambers, the braiding mechanism then applies a layer of interwoven reinforcing filament fiber, and the overcoat applicator applies a protective polymeric coating over the fiber layer. The entire device is computer-controlled for maximum automated efficiency. The first extruder and the hole-forming laser may be omitted if the inner tubular core is to be omitted from the pressure vessel.
摘要:
The invention relates to a method in operating a lined cavern provided for the storage of gas coming from a pipeline. During filling of the cavern with gas to a nominal pressure, at least a portion of the gas is withdrawn from the cavern and recirculated to the cavern under cooling and without substantial compression. The method also includes recirculating the gas under heating and without substantial compression.
摘要:
Improved joints for cryogenic liquid-containing tanks are disclosed. The joints include a support plate, a lower arm mounted on the support plate, an upper arm mounted on the support plate spaced from the lower arm, and tank skins extending into the space between the lower and upper arms. Sealing layers are provided between the tank skins and the joint arms. The joints are particularly useful for space launch vehicle cryogenic liquid propellant tanks which must be lightweight, withstand high structural loads and maintain leak-free conditions.
摘要:
A compact portable transport unit for shipping hyperpolarized noble gases and shielding same from electromagnetic interference and/or external magnetic fields includes a means for shifting the resonance frequency of the hyperpolarized gas outside the bandwidth of typical frequencies associated with prevalent time-dependent fields produced by electrical sources. Preferably the transport unit includes a magnetic holding field which is generated from a solenoid in the transport unit. The solenoid includes a plurality of coil segments and is sized and configured to receive the gas chamber of a container. The gas container is configured with a valve, a spherical body, and an extending capillary stem between the valve and the body. The gas container or hyperpolarized product container can also be formed as a resilient bag. The distribution method includes positioning a multi-bolus container within the transport unit to shield it and transporting same to a second site remote from the first site and subsequently dispensing into smaller patient sized formulations which can be transported (shielded) in another transport unit to yet another site.