Abstract: Systems and methods for improved hydraulic control systems for actuation of subsea equipment in deep water are disclosed. The hydraulic control system relies on smaller fluid flow associated with a hydraulic pressure pulse to actuate the small volume actuation control valve. In one embodiment, the system includes small diameter control umbilical hoses and pilot-operated valves with low actuation volumes. Particularly, a hydraulic control system for reducing the signal time to a subsea blowout preventer in water depth up to and greater than about 5000 feet. Some embodiments comprise a valve arrangement which hydraulically actuate one side of a hydraulic control function, while simultaneously evacuating the opposing circuit both at the seabed and at the surface. Some embodiments comprise an umbilical hose located proximate the center of an umbilical bundle. Preferably, the umbilical hose has a plurality of layers of reinforcing fibers which increase with the diameter of the reinforcement layer.

Abstract: A hydraulic control system and method utilizing a retrievable control pod for the actuation of subsea blowout preventer stacks are disclosed. In one embodiment, the hydraulic control system comprises a subsea hydraulic umbilical line, a lower marine riser package having a hydraulic receptacle, a hydraulic control pod having a hydraulic connector for hydraulically mating with the hydraulic receptacle, at least one pod umbilical hydraulic connector hydraulically connected through umbilical connector piping to the hydraulic control pod, and at least one lower marine riser package umbilical hydraulic connector for hydraulically mating with the pod umbilical hydraulic connector and the subsea hydraulic umbilical line.

Abstract: A sewage system in which the transport medium or flush medium is a liquid having a specific gravity less than that of water. The flush medium after transporting sewage waste to a tank or the like thereafter separates from the sewage and floats on top of it becoming available for reuse.