specifically fig2 shows a marine riser 100 and a riser telescopic joint 130 a riser tensioning system 110 supports and maintains a constant tension on marine riser 100 the bottom of marine riser 100 is connected to a sub sea blowout preventer 120 sub sea blowout preventer 120 is connected to a wellhead not shown positioned above riser tensioning system 110 is the concentric riser support body 200 concentric riser support body 200 mates with marine riser 100 and telescopic joint 130 although fig2 does not show any marine riser joints above concentric riser support body 200 one skilled in the art readily understands that such an arrangement is possible of importance however is the relationship between concentric riser support body 200 and riser tensioning system 110 in the preferred embodiment concentric riser support body 200 is positioned above riser tensioning system 110 although a preferred embodiment includes concentric riser support body 200 components of the invention may be incorporated directly into one or more riser tubular members in this configuration the system may retain the functionality disclosed herein without a concentric riser support body 200 concentric riser support body 200 also includes a concentric riser support 210 concentric riser support 210 positions and supports concentric riser 300 fig3 within marine riser 100 concentric riser support body 200 also includes riser annular seal 220 riser annular seal 220.