| 摘要 |
This invention relates to a flexible pipe which is designed to withstand continual flexing and bending of the pipe and also to withstand high internal pressures in the order of 5000/7000lbs per sq.inch. The pipe consists of a stainless steel spiral wound core tube 39 encased in two layers of inner plastic liner 37 and 38. The flexible element of the pipe, which withstands the high pressures, consists of a series of rings 120 which have spigot connections and flanges 123. Adjacent rings 120 are held together by keepers 128 which have radially inwardly projecting engagement features with wedge-shaped surfaces. The keepers are staggered circumferentially around the pipe. The keepers may be retained in position by steel bands (not shown) and finally by an outer plastic cover 36.
<??>The rings 120 are sufficiently thick and are of sufficiently high tensile strength to withstand the hoop stress developed when oil or other fluid flows through the pipe at high pressure. The keepers are used to withstand the whole of longitudinal stress.
<??>In an alternative embodiment a wire or group of wires runs centrally down the pipe to withstand the longitudinal stress and is spaced from the pipe by spiders.
<??>A particular use of the pipe is for conveying oil or gas from an under sea oil well terminal to a floating surface reception point such as a buoy or ship.
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