Case Study 3
Tree Cap Flange Removal
|Job:||Removal of tree cap flange from top of XMT|
|Time Taken to Complete Removal:||12 hours|
■ Removal of a 7 1/16” 5M tree cap flange in order for the client to install an adapter plate. This was to allow them to hang the well from a tension table, for conductor cutting and replacement.
■ Significant amounts of blinding force generated by rust in the bolt hole annuli and between the flange faces extending all the way to the ring gasket.
■ The client had tried several methods to unsuccessfully remove the tree cap flange.
■ ThinJack conducted a site survey and designed & manufactured ThinJack’s to suit the chamfer size of tree cap, this maximised the size of the ThinJack to allow greater force to be generated.
■ A combination of ThinJacks and associated shims, manufactured to API 6A 7 1/16” 5M flange size specification, were tightly packed into the gap. This allowed the ThinJack technicians to precisely control the location that the generated force was applied to.
■ Initial gap of 12.1mm increased to 26.6mm using 6 ThinJacks.
■ Maximum pushing force of 48 tonnes.