UMBILICAL WITH FATIGUE RESISTANT FIBRES
First Claim
1. An umbilical casing for an umbilical for use in underwater drilling operations, the umbilical casing comprising:
- an inner thermoplastic polymer layer;
an outer thermoplastic polymer layer; and
at least two fibre reinforcement layers between the inner and outer thermoplastic layers;
wherein the fibre reinforcement layers are contra helical with each comprising at least one group of fibre yarns laid helically along the outside of the inner thermoplastic layer; and
wherein each group of fibre yarns comprises a plurality of fibre yarns laid to run in side by side fashion along the outside of the inner thermoplastic layer.
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Accused Products
Abstract
An umbilical casing for an umbilical, for use in underwater drilling operations includes an inner thermoplastic polymer layer, an outer thermoplastic polymer layer and at least two fibre reinforcement layers between the inner and outer thermoplastic layers. The fibre reinforcement layers are contra helical with each including at least one group of fibre yarns laid helically along the outside of the inner thermoplastic layer. Each group of fibre yarns comprises a plurality of fibre yarns laid to run in side by side fashion along the outside of the inner thermoplastic layer. An umbilical including the casing and methods of manufacture are also provided.
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Citations
16 Claims
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1. An umbilical casing for an umbilical for use in underwater drilling operations, the umbilical casing comprising:
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an inner thermoplastic polymer layer; an outer thermoplastic polymer layer; and at least two fibre reinforcement layers between the inner and outer thermoplastic layers;
wherein the fibre reinforcement layers are contra helical with each comprising at least one group of fibre yarns laid helically along the outside of the inner thermoplastic layer; andwherein each group of fibre yarns comprises a plurality of fibre yarns laid to run in side by side fashion along the outside of the inner thermoplastic layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of forming an umbilical casing comprising:
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providing a first, inner, extruded tubular layer of a thermoplastic polymer; laying at least two contra helically wound fibre reinforcement layers around the first layer of thermoplastic polymer; and extruding a second, outer, layer of thermoplastic polymer onto the first layer and the two fibre reinforcement layers; wherein the fibre reinforcement layers each comprise at least one group of fibre yarns laid helically along the outside of the inner thermoplastic layer; and wherein each group of fibre yarns comprises a plurality of fibre yarns laid to run in side by side fashion along the outside of the first, inner, thermoplastic layer.
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Specification