Method for separating flanges

Abstract

A method for separating two flanges joined by bolts extending through boltholes provided therein comprises the use of a clamshell cutting apparatus having a rotating annulus with at least one cutting tool. The cutting tools are rotated and advanced against the bolts until they are sheared. The flanges are then separated from each other.

1 . A method of separating a joint formed by two flanges, said flanges being connected together by means of bolts extending through boltholes provided on each of the flanges, the method comprising:
 providing a cutting apparatus proximal to said joint, the cutting apparatus having a rotating annulus, the annulus having an inner diameter greater than the outer diameter of the flanges, wherein the annulus includes at least one cutting tool on said inner diameter, said cutting tool being directed radially inwardly and wherein said cutting tools are moveable radially inwardly;   positioning said cutting apparatus circumferentially over said joint and over said flanges;   positioning said cutting apparatus whereby said cutting tool is positioned adjacent said bolts;   rotating said annulus circumferentially about said joint;   advancing said cutting tool radially inwardly until said bolts are sheared; and   separating said flanges.   
   
   
       2 . The method of  claim 1  wherein said cutting tool is first advanced against nuts provided over said bolts. 
   
   
       3 . The method of  claim 1  wherein said cutting apparatus comprises a clamshell cutting apparatus.