On an offshore oil platform, Topsides refers to the surface hardware installed. An oil platform or oil rig is a large structure used to house workers and machinery needed to drill and/or extract oil and Natural gas through wells This includes the oil production plant, the accommodation block and the drilling rig. An oil production plant (sometimes called an oil terminal) is a facility which performs processing of Production fluids from Oil wells in order to separate For a detailed diagram of a Petroleum drilling rig, See Drilling rig (petroleum A drilling rig is a machine which creates holes (usually called They are often modular in design and so can be changed out if necessary allowing expensive platforms to be more readily updated with newer technology.
On a boat, it is the part of the hull between the waterline and the deck. A hull is the body of a Ship or Boat. It is a central concept in floating vessels as it provides the Buoyancy that keeps the vessel from sinking Waterline refers to an imaginary line marking the level at which Ship or Boat floats in the Water.
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