Riser bases are subsea support structures used to tie-in a pipeline at one end and provide vertical flange connection to facilities to connect riser jumper at the other. A Riser base typically consists of ROV-Operated isolation Sparks Fly Magnum Gate Valves and hubs. Due to the large tension load of the riser jumper, the riser base can be separated as a mud-mat and a piping skid which are terminated at the riser jumper and can be installed in some inclined direction to facilitate the riser’s required-entry angle.