The present application relates to a method for pressurizing the inner flow space of an underwater flexible pipe intended for transporting hydrocarbons, comprising the following steps: a) providing a flexible pipe comprising a reinforcing layer made up of a short-pitch winding of at least one metal wire with noncontiguous turns around a thermoplastic polymer sheath defining an inner space, then b) filling the inner space of the flexible pipe with an oil, then c) increasing the inner pressure Pi of the flexible pipe to at least 10 MPa, the inner pressure being exerted by said oil, then d) maintaining the inner pressure Pi of the flexible pipe at a pressure of at least 10 MPa for a time D of at least one minute,
characterized in that said oil has a kinematic viscosity at 40 C., measured according to the ASTM D445 standard, of more than 10 mm.sup.2/s. This method makes it possible to reduce, or even prevent, the appearance of cavitation and crazing on the polymer sheath.

The present invention is directed to a new concept for an internal metallic tank of large-scale high-pressure gasholder in which pluralities of internal tanks have been accumulated like a honeycomb structure and for the manufacturing processes of the internal metallic tank.

A sash (62) of a window opening up to 180 and capable of tilting is mounted onto a fixedly installed frame profile (63) and houses a pair of superimposing sashes that fit tightly therein when in closure position, i.e. an upper stationary sash (65) and a lower movable-divertible sash (64), each of the sashes (64,65) provided with laterally extending shafts (49) for connection with sash (62), roller wheels (50) provided onto the shafts (49) of sash (64) that roll within a predefined path created by insert guide profile members (19) and diverter guide members (66,68) to alternately bring sash (64) in a position of superimposing sash (65) and a position of alignment with the same. Lifting mechanisms (46) provided with a regulatory screw (84) for adjusting the pretension of a spring component thereof and thereby the force required by the user for moving the sash (64) are installed within the vertically extending sides of the sash (62).

A preform-charge fixture creates a preform charge, which is a partially consolidated assemblage of preforms that can be efficiently transferred to a mold to create a finished part in a molding process, such as compression molding. In the illustrative embodiment, the preform-charge fixture includes peripheral cleats that are movable towards a central cleat to create a small gap therebetween that receives and constrains preforms in a desired position. The fixture also includes clamps, which are operable to engage an uppermost layer of preforms in the gap and apply a slight amount of downward pressure thereto to assure that the preforms are properly seated. The fixture also accommodates an energy source that heats the preforms so that, in conjunction with downforce applied by the clamps and/or gravity, the preforms can be tacked together, forming the preform charge.

A thin ribbon spirally wound polymer conduit and method of forming, wherein a helical reinforcing bead is interposed adjacent overlapping layers of ribbon. Further, a method of continuously forming spirally wound conduit wherein a sacrificial layer, preferably having a different base polymer to that of the conduit, is first applied to the former before the conduit is formed overtop.

An undermold coupling to couple a hose to a hose fitting includes: a tubular portion to be inserted into a hose interface of the hose fitting; threads formed on an inner surface of the tubular portion to engage a support helix on an end of the hose as a set of threads; and a first grating comprising a first plurality of elongate portions to intermesh with a corresponding second plurality of elongate portions of a second grating of the hose interface, wherein the first plurality of elongate portions extend into a second plurality of slots defined by the second plurality of elongate portions, and the second plurality of elongate portions extend into a first plurality of slots defined by the first plurality of elongate portions.

Plastic pipes and a continuous production device and method for a glass fiber reinforced tape polyethylene composite pipe is provided. The main structure of the production device includes a first extruder, an inner pipe die, a vacuum sizing box, a first cooling spray box, a first tractor, a first winding machine, a first heater, a second winding machine, a second heater, an automatic tape replacing manipulator, an outer pipe extruder, an outer pipe extrusion die, an outer pipe cooling shaping die, a second cooling spray box, a second tractor, a meter counter, a fixed length cutting machine and finished pipe racks. The process of the production method totally includes four steps: inner pipe extrusion molding, continuous winding of the composite tape, outer pipe extrusion cladding, and cutting and warehousing, thus realizing the continuous on-line production of the glass fiber reinforced tape polyethylene composite pipe.

Disclosed herein is a method for filament winding. The method includes bonding a veil material to the unidirectional fabric to veil-stabilize the unidirectional fabric. The method also includes slitting the veil-stabilized unidirectional fabric to separate a veil-stabilized fabric portion. The method also includes directing the veil-stabilized fabric portion to an application head. The method also includes winding the veil-stabilized fabric portion on a winding mandrel.

A fiber-reinforced member includes: a base member having a tubular region with an outer circumferential surface extending along and substantially in parallel with an axial direction; and a fiber-reinforced resin layer constituted of a tow prepreg wound in an overlapping manner to cover the outer circumferential surface of the base member along a predetermined direction crossing the axial direction when viewed in a radial direction of the base member, the tow prepreg serving as a widened tape-like member. The tape-like member constituting the fiber-reinforced resin layer has a portion having a fiber line extending along a direction crossing the predetermined direction. A size of a width of the tape-like member constituting the fiber-reinforced resin layer is not less than 100 times and not more than 400 times as large as a size of a thickness of the tape-like member constituting the fiber-reinforced resin layer in the radial direction.

There is provided a high-pressure tank manufacturing method that ensures a shorten heating period compared with a conventional one and eliminates a need for taking out a material for heating after heating. A high-pressure tank manufacturing method includes: disposing a conductive heating material on an outer periphery of a resin liner; winding a conductive fiber with which thermosetting resin is impregnated around the outer periphery of the resin liner on which the heating material is disposed; and heating the heating material and the fiber on the outer periphery of the resin liner by induction heating to harden the thermosetting resin.