Means for connecting pipes comprising an axial press surface to take axial pressure from a preloading tool

Abstract

A means of connecting pipes, comprising a seal ( 2 ), flanges ( 3, 3′ ), a threaded portion ( 15 ) and a nut ( 5 ), where the end portion ( 1, 1′ ) of the pipe is equipped with a concentric press surface ( 23 ) located immediately proximal to the periphery of the pipe ( 1, 1′ ) and designed to be able to take an axial pressure from a preloading tool ( 25 ), which pressure is distributed evenly or point-by-point about the periphery of the pipe. A means of compressing pipe couplings, where a preloading tool ( 25 ) comprises two end sections ( 27, 31 ) connected to two or more rods ( 35 ), each rod ( 35 ) being equipped with a hydraulic cylinder ( 37 ).

1 . A means of connecting pipes, comprising a seal ( 2 ), flanges, a threaded portion and a nut, wherein the end portion of the pipe is equipped with a concentric press surface located immediately proximal to the periphery of the pipe and designed to be capable of taking an axial pressure from a preloading tool, the pressure directed compressingly towards the pipes' end portions, which pressure is distributed evenly or point-by-point about the periphery of the pipe and sufficient to preload the seal, the preload of the seal principally being retained by a corresponding threaded nut and collar after removal of the preloading tool.  
   
   
       2 . A means in accordance with  claim 1 , wherein the nut has a flange designed to be able to take an axial pressure from the preloading tool, which pressure is distributed evenly or point-by-point about the periphery of the nut and directed towards the pipe flange.  
   
   
       3 . A means in accordance with  claim 1 , wherein a rear portion of said collar is designed to be able to take an axial pressure from the preloading tool, which pressure is distributed evenly or point-by-point about the periphery of the collar and directed towards the pipe flange.  
   
   
       4 . A means in accordance with  claim 1  wherein a rear portion of said collar has a toothed periphery.  
   
   
       5 . A means in accordance with  claim 1  wherein a rear portion of said nut has a toothed periphery.  
   
   
       6 . A means of compressing pipe couplings comprising two concentric press surfaces designed to be capable of supporting an axial pressure sufficient to preload a seal, a preloading tool is designed to compress the end portions of the pipes, further comprising two end sections connected to two or more rods, each rod being equipped with a hydraulic cylinder, the preload on the seal principally being retained by a corresponding threaded nut and collar after removal of the preloading tool.  
   
   
       7 . A means in accordance with  claim 6 , wherein the preloading tool comprises a nut runner.  
   
   
       8 . A means in accordance with  claim 7 , wherein the nut runner is equipped with a cogwheel allocated to the rotation of a threaded collar with a toothed periphery of a rear portion of the collar.  
   
   
       9 . A means in accordance with  claim 7 , wherein the nut runner is equipped with a cogwheel allocated to the rotation of a nut with a toothed periphery of a rear portion of the nut.