Abstract: Fire protection for the tensioner cylinders of a marine riser tensioner system in oil and gas offshore drilling and production rigs where the tensioner cylinders are coated with intumescent epoxy and their respective cylinder rods are enclosed within outer fire protection cylinders which comprise an inner metal lining and an outer jacket. The outer jacket comprises an inner multi-layer thick blanket of ceramic fibrous materials and barrier films contained within inner and outer layers of woven ceramic fibers for reinforcement and abrasion resistance. The outer fire protection cylinders telescope over the tensioner cylinders as the cylinder rods extend and retract in response to vertical movement of the rigs. The intumescent epoxy on the tensioner cylinders are covered with a bearing sleeve to provide a smooth surface for the telescoping fire protecting cylinders and fire retardant mechanisms are located at the tops and bottoms of the telescoping cylinders to prevent intrusion of heat and flame.

Abstract: A fire protection system comprising a plurality of insulation protective jackets placed around the top joint of a riser string above and below the tensioner ring and its protective cover and over the threads or annular protrusions used to facilitate the connection of the tensioner ring to the top joint. Each protective jacket comprises an outer section of multiple layers of cloth, the outer layer being of an abrasive resistant, weather resistant material, and at least one of these layers being a woven ceramic fiber that helps to eliminate flame impingement, one or more layers of reinforcement (as many as required) and an inner section composed of a thick interior multi-layered composite layer of ceramic fibrous material and barrier films and an inner abrasion resistant liner to minimize heat transfer and gas passage to the protective part.

Abstract: A passive fire protection system for the protection of articulating joints and flexible connections against flame and heat in a severe total environment type fire such as a hydrocarbon fire which includes multi-layered flexible protective covers on articulating joints and flexible connections. These multi-layered flexible covers comprise an outer section of one or more layers of cloths, the outer section being of an abrasion resistant, weatherproof outer layer, with a woven ceramic fiber to resist flame impingement, and reinforcement mesh and stitching as required. The inner section is a thick interior multi-layered composite blanket of ceramic fibrous materials, barrier films, and an inner layer of abrasion resistant cloth to minimize heat transfer to the articulating joint or flexible connection. The thickness of the interior layer is determined by the mass being protected and the height of the allowable temperature for a particular fire rating.