Ldf =Ĭlick here when any values are modified to update the result.Ĭalculate the force required to give the stated deflection of , or. Lcs =Ĭasing deflection at point of lateral constraint.
F a =ĭistance from TOC to the point where lateral movement is constrained.
Net axial forces at the point of interest, eg arising from BOP weight (compressive is -ve). How much stress does this put on the pipe at the TOC? Could fatigue be a problem? With a subsea BOP, the riser tensioners normally keep the axial force neutral point at the connector between BOP and LMRP – so the weight of the BOP will reduce the axial force and therefore stress in the pipe (make it less tensile / more compressive). The top of the conductor can move laterally because of the low top of cement.
For example, a conductor pipe cemented in place has a TOC some distance below the BOP. This worksheet calculates combined stress in a tube resulting from bending stress and axial stress.
