UMBILICAL WITH FATIGUE RESISTANT FIBRES

摘要

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.

主权项

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.