A multilayer tube, particularly for fluids, includes a sheath made of fluorinated polymers which is located in an innermost layer, which is adapted to be in contact with a circulating fluid, and is constituted by coupling a first, nonconducting material to a second, black-pigmented material that is electrically at least antistatic in the form of one or more continuous strips. The sheath has a smooth internal surface and is reinforced with external layers that are predominantly made of rubber.

A flexible pipe having one way fluidic flow valves containing a working fluid that generates one way fluid flow to power a generator. Preferably the pipe is buoyant or otherwise flexed by motion of any supporting or surrounding liquid, so that waves in the liquid flex the pipe. Preferably an added interior pumping arm is provided to increase the fluid flow from flexing.

A flexible pipe having one way fluidic flow valves containing a working fluid that generates one way fluid flow to power a generator. Preferably the pipe is buoyant or otherwise flexed by motion of any supporting or surrounding liquid, so that waves in the liquid flex the pipe. Preferably an added interior pumping arm is provided to increase the fluid flow from flexing.

Tubing comprising a tubing wall formed of an elongate thermoplastic ribbon helically wrapped and heat bonded to itself to form the tubing wall. The tubing may include one or more elongate conductors helically wrapped around and along the tubing wall. The tubing may include an elongate reinforcement rib helically wrapped around and along the tubing wall such that the tubing wall includes a first portion in which the elongate reinforcement rib covers the one or more elongate conductors and a second portion in which the one or more elongate conductors are uncovered by the elongate reinforcement rib and the elongate reinforcement rib wraps around the tubing wall.

Tubing comprising a tubing wall formed of an elongate thermoplastic ribbon helically wrapped and heat bonded to itself to form the tubing wall. The tubing may include one or more elongate conductors helically wrapped around and along the tubing wall. The tubing may include an elongate reinforcement rib helically wrapped around and along the tubing wall such that the tubing wall includes a first portion in which the elongate reinforcement rib covers the one or more elongate conductors and a second portion in which the one or more elongate conductors are uncovered by the elongate reinforcement rib and the elongate reinforcement rib wraps around the tubing wall.

One aspect of the invention provides a system including: a length of energy-dissipative tubing; a first sealing device coupled to a first end of the length of energy-dissipative tubing; and a second sealing device coupled to a second end of the length of energy-dissipative tubing. Exposure to one or more selected from the group consisting of: fault currents or lightning strikes at an exposure point along the length of energy-dissipative tubing will produce arcs at the exposure point and at least one of the first end and the second end.

One aspect of the invention provides a system including: a length of energy-dissipative tubing; a first sealing device coupled to a first end of the length of energy-dissipative tubing; and a second sealing device coupled to a second end of the length of energy-dissipative tubing. Exposure to one or more selected from the group consisting of: fault currents or lightning strikes at an exposure point along the length of energy-dissipative tubing will produce arcs at the exposure point and at least one of the first end and the second end.

There is provided a multilayered tube for transporting liquid chemicals containing an outermost layer and an innermost layer, the innermost layer containing a polyamide (A), an impact modifier (B), and a carbon nanotube (C), wherein the number of projections each having a height of 5 μm or more and a longitudinal width of 20 μm or more, which are present on the surface of the innermost layer, is 2 or less per 1 mm.sup.2 of surface area; and the number of agglomerates each having a longitudinal width of 5 μm or more, which are present in the cross section of the innermost layer, is 15 or less per 1 mm.sup.2 of cross-sectional area. There is also provided a polyamide resin composition constituting the innermost layer of the multilayered tube for transporting liquid chemicals.

A fluororesin material containing a fluororesin. The fluororesin has a carbonyl group, the total number of carbonyl groups is 1 or more and less than 800 per 10.sup.6 main-chain carbon atoms, and the fluororesin contains ethylene unit and tetrafluoroethylene unit. When the fluororesin material is heated at a rate of 10° C./minute, the initial pyrolysis temperature when the mass reduction of the fluororesin material reaches 1% by mass is 390° C. or more.

A system for sensing a physical property of a fluid flowing inside a composite hose includes a radio frequency identification (RFID) reader arranged to transmit radio frequency signals. An RFID tag receives the radio frequency signals and exchanges the received radio frequency to electrical energy powering the RFID tag. An included sensor electrically connected to the RFID tag receives the electrical energy from the RFID tag and powers the sensor to obtain measurement data of at least one physical property of the fluid and transmit the measurement data to the RFID tag. The RFID tag transmits the measurement data to the RFID reader using the radio frequency.