Flat textile reinforcing strip for ducts and the duct thus reinforced

Abstract

The invention relates to a flat textile strip which is made from, for example, a reinforced thermoplastic material. The inventive strip is wound around a tube in order to act as armour for a duct through which a pressurised fluid flows. The invention is characterised in that said strip ( 10 ) comprises a central piece ( 11 ) having a more or less rectangular section and two longitudinal edges ( 12 ) which are thinner than the central piece.

1 . A flat textile tape, intended to produce, by winding around a tube, the armor for a pipe serving to convey a pressurized fluid, characterized in that the tape ( 10 ) is formed from a central section ( 11 ) of approximately rectangular cross section and from two longitudinal edges ( 12 ) that are thinner than the central section.  
     
     
         2 . The tape as claimed in  claim 1 , characterized in that the thickness of the longitudinal edges ( 12 ) is approximately equal to one half of the thickness of the central section ( 11 ).  
     
     
         3 . The tape as claimed in either of the preceding claims, characterized in that the width of the edges ( 12 ) is between 5% and 15% of the width of the central section ( 11 ).  
     
     
         4 . The tape as claimed in any one of the preceding claims, characterized in that the weave density of the tape is equal to or greater than 39%.  
     
     
         5 . The tape as claimed in any one of the preceding claims, characterized in that it is formed from filament rovings held together by binding means and a thermoplastic bonding material.  
     
     
         6 . The tape as claimed in any one of  claims 1  to  5 , characterized in that it is formed by a single thickness of filament rovings ( 14 ,  14 ′) having different dimensions in the central part ( 11 ) and in the edges ( 12 ).  
     
     
         7 . The tape as claimed in any one of  claims 1  to  6 , characterized in that the tape ( 10 ) is provided with a tracer ( 16 ) in the region of the boundary between the central part ( 11 ) and the edges ( 12 ).  
     
     
         8 . A pipe for transporting a pressurized fluid, consisting of an internal tube ( 2 ) coated with at least one ply ( 3 ,  4 ) of flat textile tapes ( 10 ) wound helically on the tube ( 2 ), characterized in that the tapes ( 10 ) are formed from a central section ( 11 ) having an approximately rectangular cross section and from two longitudinal edges ( 12 ) that are thinner than the central section, the tapes ( 10 ) being wound with at least partial overlapping of the lateral edges ( 12 ).  
     
     
         9 . The pipe as claimed in  claim 6 , characterized in that the lay angle of the tapes ( 10 ) relative to the longitudinal axis of the pipe is between 52° and 58°, preferably chosen to be 55°.  
     
     
         10 . The pipe as claimed in either of claims  6  and  7 , characterized in that the number of flat tapes of the winding is less than ten.  
     
     
         11 . The pipe as claimed in any one of  claims 6  to  8 , characterized in that the mean width of the tapes ( 10 ) is equal to or greater than πDcosα/10, where D is the outside diameter of the tube  2  and α is the lay angle of the ply ( 3 ,  4 ) of tapes ( 10 ).