The invention relates to a flexible tubular duct for transporting gases under high pressure in the field of offshore oil exploitation. The duct is of the unlinked and smooth passageway type, and comprises from inside to outside an inner polymer tube, a pressure vault formed by the short-pitch rolling...http://www.google.com/patents/US7891384?utm_source=gb-gplus-sharePatent US7891384 - Flexible tubular pipe for transporting gaseous hydrocarbons
