Segmented steel tube bundle termination assembly

Abstract

A termination and anchorage for steel helical segmented steel tubing bundles includes a set of multiple separable anchor blocks to which the individual tubes in the bundle can be attached and a clamp assembly for securing and supporting the set of anchor blocks. Multiple comating annular arcuate outer anchor blocks for the outer tubes in the tubing bundle surround a central anchor block, for the center tube in the tubing bundle. The aggregation of anchor blocks is compactly assembled and held together by surrounding the assembled blocks with a separable clamp assembly.

1 . A subsea termination device for a helical tubing bundle comprising: 
 a) a center anchor block attached to a center tube of a tubing bundle;    b) a plurality of outer anchor blocks surrounding the inner anchor block, each outer anchor block attached to an outer tube of the tubing bundle, wherein each outer anchor block has an interior surface abutting an outer surface of the center anchor block and an exterior surface; and    c) a selectably removable clamp, wherein the clamp surrounds and engages the exterior surface of the outer anchor blocks.    
   
   
       2 . The subsea termination device of  claim 1 , wherein the interior surface of the outer anchor blocks is comatable with the outer surface of the center anchor block.  
   
   
       3 . The subsea termination device of  claim 1 , wherein the outer anchor blocks constitute a segmented ring.  
   
   
       4 . The subsea termination device of  claim 1 , wherein the center anchor block is attached to the center tube by welding.  
   
   
       5 . The subsea termination device of  claim 1 , wherein the outer anchor blocks are attached to the outer tubes by welding.  
   
   
       6 . The subsea termination device of  claim 1 , wherein the clamp is a split clamp assembly having a first clamp half and a second clamp half cojoined by threaded fasteners.  
   
   
       7 . The subsea termination device of  claim 6 , wherein a flange on each outer anchor block engages the first or second clamp half.  
   
   
       8 . The subsea termination device of  claim 1 , wherein the center anchor block and the outer anchor blocks have comating frustoconical surfaces.  
   
   
       9 . The subsea termination device of  claim 1 , wherein each outer anchor block is retained within two opposed transverse flanges of the center anchor block.  
   
   
       10 . The subsea termination device of  claim 1 , wherein each outer anchor block comprises: a transverse flange, a right circular partial cylindrical inner face, a symmetrically positioned right circular through hole, and a right circular partial cylindrical outer face.  
   
   
       11 . The subsea termination device of  claim 10 , wherein a radius of the inner face of the outer anchor block is substantially similar to a radius of an outer cylindrical surface of the center anchor block.  
   
   
       12 . The subsea termination device of  claim 1 , wherein an upper transverse face of the outer anchor block abuts a flange of the center anchor block.  
   
   
       13 . The subsea termination device of  claim 1 , wherein the center anchor block and the outer anchor blocks have a radially outwardly extending transverse flange and wherein the flange of the center anchor block abuts a side of each of the outer anchor blocks and the flange of the outer anchor blocks engages the clamp.  
   
   
       14 . The subsea termination device of  claim 1 , wherein the clamp is mounted on a mounting structure comprising a tubular section having an outwardly extending transverse flange.  
   
   
       15 . The subsea termination device of  claim 14 , wherein the transverse flange has a frustroconical transition section where the flange joins the tubular section of the mounting structure.  
   
   
       16 . The subsea termination device of  claim 14 , wherein the mounting structure has a through hole with a diameter sufficiently large for the tubing bundle to pass through the through hole.  
   
   
       17 . The termination device of  claim 1 , wherein 
 a) the outer surface of the center anchor block is frustroconical with a taper in a first direction;    b) the interior surface of each outer anchor block is frustroconical with a taper in the same direction as the frustroconical outer surface of the center anchor block and comateable with the outer surface of the center anchor block;    c) the exterior surface of each outer anchor block is frustroconical with a taper in the same direction as the frustroconical outer surface of the center anchor block; and    d) an inner face of the clamp is frustroconical with a taper in the same direction as the frustroconical outer surface of the center anchor block and comateable with the exterior surface of the outer anchor blocks, thereby permitting the inner and outer anchor blocks to resist axial movement.    
   
   
       18 . A termination device comprising: 
 a) an anchor block assemblage having a center anchor block attached to a center tube of a tubing bundle, a plurality of outer anchor blocks surrounding the center anchor block wherein each outer anchor block has an interior surface comateable with an outer surface of the center anchor block;    b) a ring clamp engageable around the anchor block assemblage to thereby rigidize the anchor block assemblage; and    c) a retaining means for restraining the axial motion of the center and outer anchor blocks.    
   
   
       19 . The termination device of  claim 18 , wherein the retaining means includes a pair of opposed flanges on the inner and the outer anchor blocks.  
   
   
       20 . The termination device of  claim 18 , wherein the retaining means includes: 
 a) a pair of opposed center anchor block flanges, one flange extending radially outward from a first end of the center anchor block and a second flange extending radially outward from a second end of the center anchor block;    b) a pair of opposed outer anchor block flanges, one flange extending radially outward from a first end of each outer anchor block and a second flange extending radially outward from a second end of each outer anchor block;    c) the flange at the first end of the center anchor block abuts the first end of each of the outer anchor blocks;    d) the flanges at the first end of the outer anchor blocks abut a one end of a first side of the ring clamp;    e) the flange at the second end of the center anchor block abuts the second end of each of the outer anchor blocks; and    f) the flanges at the second end of the outer anchor blocks abut a second end of the first side of the ring clamp.    
   
   
       21 . The termination device of  claim 18 , wherein the outer anchor blocks constitute a segmented ring.  
   
   
       22 . The subsea termination device of  claim 18 , wherein the retaining means includes the center anchor block and the outer anchor blocks have comating frustoconical surfaces.  
   
   
       23 . The termination device of  claim 18 , wherein the retaining means includes 
 a) a first taper on the outer surface of the center anchor;    b) a second taper on the interior surface of each outer anchor block, wherein the first and second tapers are comateable;    c) a third taper on the exterior surface of each outer anchor block; and    d) a fourth taper on the exterior surface of the outer anchor blocks, wherein the third and fourth tapers are comateable.    
   
   
       24 . The subsea termination device of  claim 18 , wherein the clamp is mounted on a mounting structure comprising a tubular section having an outwardly extending transverse flange.