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Linear sliding seal

Linear sliding seal

Linear sliding seal

(OP)
I am looking at a project that will use a long ram tube (about 200mm dia and 80m long) that has a 50-60mm wide slot along the length.  The tube will contain a "bullet" which acts as a piston plate.  An armature passes through the slot.  I need to find some kind of sealing system so that as pressurised water is pumped into the tube behind the bullet (at about 15N/mm2), it seals the slot behind it as it slides along the tube.  Ultimately the bullet will reach speeds in excess of 50m/s.  Can anyone point me towards a suitable sealing system, I cannot find anything on the internet or on seal manufacturers web pages.  Thanks

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