wash pipe 20 as will be hereinafter described in greater detail the fluid sealing structure 10 may be useable with a land or sea based drilling platform comprising drivers such as motors and pumps a rotating drill string a hoisting structure and means for circulating drilling fluid a first pressure sealing system 28 is disposed between the lower member or wash pipe 12 and the intermediate member or wash pipe 24 the first sealing system 28 is a media isolation sealing system and is configured to isolate two harsh conditions of a hard to seal media i e drilling mud that is both abrasive and non lubricating and a high pressure differential the components of the sealing system 28 namely a floating seal 30 a rear seal 32 and a grease pack or lubricating fluid 34 are preferably selected to withstand adverse conditions in operation the media isolation system functions as follows the media pushes on the floating barrier lip seal 30 which is typically a u cup lip seal that can be spring and media pressure energized behind the floating seal 30 is a lubricating fluid 34 usually grease that transfers pressure to the rear seal 32 and provides lubrication for the sealing system 28 to increase surface life the floating seal 30 then floats a small distance to maintain the pressure on the grease pack or lubricating fluid 34 a second sealing system 38 is disposed between the intermediate wash pipe 24 and a face 40 of the upper wash pipe 20 and includes a floating seal 44 a rear seal 46 and a grease pack or lubricating fluid 48 disposed there.