Evonik Degussa Gmbh

Salzgitter Mannesmann Line Pipe Gmbh

Evonik Operations Gmbh

Degussa Gmbh

Degussa Aktiengesellschaft

Andreas Dowe

Rainer Goering

Franz-Erich Baumann

Karl Kuhmann

Juergen Franosch

Sonja Bollmann

Roland Wursche

Reinhard Beuth

Maximilian Gruhn

Martin Himmelmann

Jan Berger

Hans-Juergen Kocks

Joern Winkels

Kirsten Luetzeler

Georg Schaefer

Andreas Pawlik

Horst Beyer

Martin Risthaus

Michael Boeer

Klaus Gahlmann

Rainer Göring

Jörn Winkels

Kirsten Alting

Uwe Kannengiesser

Jürgen Franosch

Claudia Behrens

Vera Schiemann

Christian Baron

Michael Böer

Marco Gensheimer

Guido-Jan Schmitz

Hans-Jürgen Kocks

Reinhard Buessing

Ralf Tuellmann

Uwe Kannengießer

Ralf TÜLLMANN

Georg Schäfer

A flexible pipe of multilayer structure with unbonded layers, where the pipe has an interior lining which comprises the following layers:

Flexible tube having high temperature resistance

A process for the production of a pipe comprising: an interior surface having a shape; and a thermoplastic inliner is provided. The process comprises: introducing the thermoplastic inliner into the interior of the pipe; heating the pipe from the outside to a temperature higher than a crystallite melting point (T) of a molding composition of an exterior surface of the inliner; expanding the inliner radially in the pipe so that an exterior surface of the inliner assumes the shape of the interior surface of the pipe; and cooling the inliner; wherein a cross section of the inliner is optionally reduced through exposure to an exterior force prior to being introduced into the pipe. Relative movements between carrier pipe and inliner are thus prevented; the risk of collapse of the inliner is moreover low. The pipe is used for the production of a laid pipeline.

Process for the production of a pipe lined with an inliner

A metal conduit pipe, which is covered with an extruded layer made of polyamide molding compound, is used to produce a duct laid in water, wherein in the course of laying the duct, the coating is exposed to a shearing pressure load and/or a bending load due to laying method selected.

Use of a conduit pipe for producing a duct laid in water

A metallic pipe for contact with a hydrolyzing medium provides longer operating times and improved high temperature resistance. The pipe contains a layer of a polyamide moulding composition containing at least 50% by weight of polyamide content containing: I) 60 to 98 parts by weight of a polyamide which contains 10 to 70 meq/kg of a terminal carboxy group and has a relative solution viscosity &#x3b7;of at least 1.90, and II) 2 to 40 parts by weight of a polyamine-polyamide graft copolymer produced from: a) 0.5 to 25% by weight, based on the entire monomer mixture, of a polyamine having at least 4 nitrogen atoms, and b) 75 to 99.5% by weight, based on the entire monomer mixture, of polyamide-forming monomers selected from lactams, &#x3c9;-aminocarboxylic acids and/or equimolar combinations of diamine and dicarboxylic acid, with the proviso that the amino group concentration of the graft copolymer is in the range from 100 to 2500 meq/kg, wherein the sum of the parts by weight of I) and II) is 100.

Metallic pipe having a hydrolysis-resistant layer of a polyamide moulding composition

A pipeline laid trenchlessly and/or without a sand bed is produced using a metallic conduit which is encased with an extruded layer of a polyamide molding material. In this way, the durability of the outer shell required for trenchless laying techniques without a sand bed is ensured.

Method of producing an underground pipeline

A pipe or pipeline for use in the oil and gas industry for conveying lines, collection pipelines and transport pipelines with reduced operating risk and increased lifetime is provided. The pipe contains: a) an external reinforcement layer and b) an internal liner which comprises securely bonded to one another: I) a layer made of a thermoplastic molding composition selected from a polyolefin molding composition and a fluoropolymer molding composition and II) a layer made of a polyamide molding composition, wherein not only the polyamide molding composition but also the molding composition of the layer according to I) in essence comprises no blend component which is composed of another polymer and which has disperse distribution in the molding composition.

Multilayer pipe with polyamide layer

The invention relates to a flexible pipe having a multi-layered structure comprising unbonded layers, comprising an inner lining having the following layer arrangement: a) an innermost layer made of a fluoropolymer molding compound, b) an intermediate layer made of a molding compound on the basis of an olefinic polymer, which is selected from the group consisting of polyethylene, isotactic polypropylene, syndiotactic polypropylene and syndiotactic polystyrene, c) an outer layer made of a polyamide molding compound, wherein the layer made of a polyamide molding compound is particularly efficiently protected against hydrolysis. The pipe is thus particularly suited for offshore applications in oil or gas production.

Flexible pipe having a multi-layered structure

The invention relates to a flexible tube of multilayer construction having unbonded layers, wherein at least one layer is formed in that a tape made of a plastic molding compound is spirally wound about a further inner layer, wherein the upper and lower layers of the tape are simultaneously or subsequently welded to each other at overlapping regions. The tube is particularly suitable for offshore application in oil and gas extraction

Flexible pipe and process for production thereof

A flexible pipe of multilayer structure which comprises the following layers, from the inside to the outside: an interior lining; an inner reinforcement layer; a layer of molded electrically conductive plastic; an outer reinforcement layer; and an exterior sheath. The electrically conductive plastic layer is in electrical contact with the two reinforcement layers, and the two reinforcement layers can be connected to a source of electrical current. It is thus possible to achieve efficient heating of the pipe, and it can therefore be used for conveying oil in cold regions.

Temperature-controllable pipe

A flexible pipe which can be heated efficiently, and may therefore be used for conveying oil in cold regions, is provided. The pipe comprises in order from inside to outside: an interior lining; a wound tape; and at least one reinforcement layer. The wound tape contains a first exterior layer of a plastics molding composition that is not electrically conductive; an intermediate layer of an electrically conductive plastics molding composition; and a second exterior layer of a plastics molding composition that is not electrically conductive. A volume resistivity to IEC 60093 of the intermediate layer is in the range from 10to 10&#x3a9;m, and the intermediate layer comprises at least two metallic conductors embedded into the plastic molding composition along an entire length of the tape in such a way that, the two conductors do not touch one another.

Temperature-controllable pipe suitable for offshore applications

A molding composition which comprises at least 50% by weight of the following constituents:

Use of a composition for contact with supercritical media

A molding compound for joining two moldings each made of a PA11 and/or PA12 molding compound contains at least 50% by weight of a polyamide component so chosen that it is preparable from linear aliphatic diamines and dicarboxylic acids and/or lactams or &#x3c9;-aminocarboxylic acids, there being 11 to 12 carbon atoms present per carboxamide group in the repeating units, and, furthermore, this polyamide component containing not more than 80% by weight of either one of the polyamides PA11 and PA12. With this compound a firm weld is obtained both to a PA11 molding and to a PA12 molding.

Joining of mouldings of different polyamide compounds

A polyamide molding composition is condensed up in the melt by means of a masterbatch containing a compound having at least two carbonate units and also a polyetheramide in which at least 50% of the end groups are present as amino end groups, whereupon the melt mixture is discharged and solidified to give a molding composition or a molding. The product obtained has an increased amino end group content and consequently an improved hydrolysis resistance.

Process for producing a molding composition or a molding with an increase in the melt stiffness

A pipe or hose composed of a polyamide moulding composition whose molecular weight has been increased by condensation, via addition of a compound having at least two carbonate units in a quantitative proportion of from 0.005 to 10% by weight, based on polyamide, where

Use of a shaped part made of a polyamide shaped component as an inliner for a conduit

A process for producing moldings with condensing-up of a polyamide molding composition whose polyamide component contains, as a result of the method of preparation, at least 5 ppm of phosphorus in the form of an acidic compound by means of a compound having at least two carbonate units, wherein

Growing community of inventors

Borken, Germany

Andreas Dowe