Fast jack liftboat shock absorbing jacking system

Abstract

A shock absorbing device and system for the jacking system of a liftboat with air or cylinder chambers and manual and pressure activated control valves connecting the shock absorbing system to the hydraulic manifold of the jacking system allowing isolation or activation of the shock absorbing system. The shock absorbing system can be retrofitted to an existing jacking system. The shock absorbing device and system cushions the vessels impact with the seabed while jacking in rough seas, reducing structural fatigue and damage to the hull and jacking system. In addition, the shock absorbing device and system can broaden the liftboat's operational envelope and allow it to operate in rougher conditions without damage to the vessel.

1 . A shock absorbing device for a liftboat jacking system with a hydraulic manifold comprising at least one air chamber connected to the hydraulic manifold by at least control valve. 
   
   
       2 . The shock absorbing device of  claim 1  wherein the control valve is manually controlled. 
   
   
       3 . The shock absorbing device of  claim 1  wherein the control valve is pressure activated. 
   
   
       4 . A shock absorbing device for a liftboat jacking system with a hydraulic manifold comprising at least one cylinder chamber with a piston and a spring connected to the hydraulic manifold by at least control valve. 
   
   
       5 . The shock absorbing device of  claim 4  wherein the control valve is manually controlled. 
   
   
       6 . The shock absorbing device of  claim 4  wherein the control valve is pressure activated.