A type IV pressure vessel has improved permeate gas management. The pressure vessel comprises an inner polymeric liner, a breather layer disposed on the liner, and an outer composite shell structure disposed on the breather layer. The breather layer is gas permeable, impermeable to liquids, and provides a flow passageway for gas permeating through the liner wall collected by the breather layer. The outer composite shell is formed by one or more layers of fiber of a first fiber type and resin. Gas permeating from an interior space of the liner is received by the breather layer and directed to a predetermined exit location on the pressure vessel.

A type IV pressure vessel has improved permeate gas management. The pressure vessel comprises an inner polymeric liner, a breather layer disposed on the liner, and an outer composite shell structure disposed on the breather layer. The breather layer is gas permeable, impermeable to liquids, and provides a flow passageway for gas permeating through the liner wall collected by the breather layer. The outer composite shell is formed by one or more layers of fiber of a first fiber type and resin. Gas permeating from an interior space of the liner is received by the breather layer and directed to a predetermined exit location on the pressure vessel.

A corrugation is provided in a polymeric liner configured for inflation against a rigid shape. The polymeric liner has a cylindrical wall with opposing inner and outer surfaces. The liner includes a first liner section having a plurality of annular corrugations. Each of the corrugations has a curved mountain region with a ridge, a curved valley between adjacent spaced apart mountain regions, and a side wall joining each successive mountain region and valley. A distance between successive ridges defines a period of the corrugations. The wall thickness of the liner at the ridge is greater than the wall thickness at the valley. A radial distance between the ridge and the valley defines an amplitude of the corrugations. The amplitude is between about 0.65 times the period and about 0.75 times said period T of the corrugations.

A corrugation is provided in a polymeric liner configured for inflation against a rigid shape. The polymeric liner has a cylindrical wall with opposing inner and outer surfaces. The liner includes a first liner section having a plurality of annular corrugations. Each of the corrugations has a curved mountain region with a ridge, a curved valley between adjacent spaced apart mountain regions, and a side wall joining each successive mountain region and valley. A distance between successive ridges defines a period of the corrugations. The wall thickness of the liner at the ridge is greater than the wall thickness at the valley. A radial distance between the ridge and the valley defines an amplitude of the corrugations. The amplitude is between about 0.65 times the period and about 0.75 times said period T of the corrugations.

For the purpose of enabling high-accuracy detection as to whether a molded resin product is a non-defective product or a defective product and advance detection of a molded resin product that may suffer deformation or the like in the future, the present invention relates to an inspection method and a manufacturing method for a molded resin product as well as an inspection device and a manufacturing device for a molded resin product, wherein, in an inspection of a joint interface of a molded resin product divided into a plurality of members, the height positions of defect candidates are measured from the results of detecting X rays radiated via at least two paths when the X rays are transmitted through the molded resin product, which makes it possible to detect a defect with high accuracy.

For the purpose of enabling high-accuracy detection as to whether a molded resin product is a non-defective product or a defective product and advance detection of a molded resin product that may suffer deformation or the like in the future, the present invention relates to an inspection method and a manufacturing method for a molded resin product as well as an inspection device and a manufacturing device for a molded resin product, wherein, in an inspection of a joint interface of a molded resin product divided into a plurality of members, the height positions of defect candidates are measured from the results of detecting X rays radiated via at least two paths when the X rays are transmitted through the molded resin product, which makes it possible to detect a defect with high accuracy.

A hydrogen discharge control system controls a hydrogen discharge flow rate in a hydrogen engine vehicle that discharges hydrogen from a hydrogen tank in which a resin liner is laminated on an inner wall, to a hydrogen engine, in accordance with an accelerator operation amount. The hydrogen discharge control system comprises a control device. The control device estimates a temperature attained in the hydrogen tank after a predetermined time elapses with the accelerator operation amount at a maximum during an on operation of an accelerator, based on a temporal temperature gradient in the hydrogen tank and a temperature in the hydrogen tank, and when the temperature attained is no higher than a first predetermined temperature, performs discharge limit control for limiting a maximum value of the hydrogen discharge flow rate from the hydrogen tank to a predetermined flow rate.

A hydrogen discharge control system controls a hydrogen discharge flow rate in a hydrogen engine vehicle that discharges hydrogen from a hydrogen tank in which a resin liner is laminated on an inner wall, to a hydrogen engine, in accordance with an accelerator operation amount. The hydrogen discharge control system comprises a control device. The control device estimates a temperature attained in the hydrogen tank after a predetermined time elapses with the accelerator operation amount at a maximum during an on operation of an accelerator, based on a temporal temperature gradient in the hydrogen tank and a temperature in the hydrogen tank, and when the temperature attained is no higher than a first predetermined temperature, performs discharge limit control for limiting a maximum value of the hydrogen discharge flow rate from the hydrogen tank to a predetermined flow rate.

A polar end ring mechanism for use with composite pressure vessels. The end ring is designed to support a pressure vessel during its formation via filament winding. The end ring helps define an opening at one of the polar ends of a tank. Spikes positioned along a portion of the end ring help prevent rotation or translation of the tank during formation and provide an improved mechanical lock with the tank body. A cap may then be secured to the polar end ring after formation in order to close the pressure vessel.

A polar end ring mechanism for use with composite pressure vessels. The end ring is designed to support a pressure vessel during its formation via filament winding. The end ring helps define an opening at one of the polar ends of a tank. Spikes positioned along a portion of the end ring help prevent rotation or translation of the tank during formation and provide an improved mechanical lock with the tank body. A cap may then be secured to the polar end ring after formation in order to close the pressure vessel.