Flexible tubing in the operation of oil and gas fields at sea

摘要

"Composition based on polyamide for flexible pipes containing oil or gas. Composition based on polyamide for the flexible tubing containing oil or gas.The present invention is a composition comprising by weight: 70 to 96% of at least a polyamide selected among the PA 11, PA 12.The aliphatic polyamides resulting from the condensation of an aliphatic diamine.Having 6 to 12 carbon atoms and an aliphatic acid having from 9 to 12 carbon atoms, and the copoliamidas 11 / 12 having more than 90% of the reasons 11.More than 90% of the reasons 12; 4 to 10% of a plasticizer; - 0 to 25% of a elastomers NBR or H - NBR; - the sum of the amounts of plasticizer and elastomers is between 4 and 30%. These compositions can be manufactured by mixing in the molten state of the different components according to the usual techniques of thermoplastic materials.They are particularly useful for pipes used in the exploitation of oil and gas fields at sea. They have a very high resistance to aging.They are also useful for simple pipelines in the car, these compositions resistant to aging caused by the temperature under the hood of the car and the nature of the fluids transported.The invention relates also to the pipelines that comprise at least one layer of this composition are used in the sea is piping, piping simple for the automobile.