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  2. Nelson complexity index - Wikipedia

    en.wikipedia.org/wiki/Nelson_complexity_index

    5] Where: is a complexity factor; is a unit capacity; is a capacity of crude distillation unit; is a number of all units; The NCI assigns a complexity factor to each major piece of refinery equipment based on its complexity and cost in comparison to crude distillation, which is assigned a complexity factor of 1.0.

  3. Oil well - Wikipedia

    en.wikipedia.org/wiki/Oil_well

    The pumpjack, such as this one located south of Midland, is a common sight in West Texas. An oil well is a drillhole boring in Earth that is designed to bring petroleum oil hydrocarbons to the surface.

  4. Organotin chemistry - Wikipedia

    en.wikipedia.org/wiki/Organotin_chemistry

    Organotin compounds are those with tin linked to hydrocarbons. The compound on the picture is trimethyltin chloride, an example of organotin compounds.. Organotin chemistry is the scientific study of the synthesis and properties of organotin compounds or stannanes, which are organometallic compounds containing tin–carbon bonds.

  5. Liquefied petroleum gas - Wikipedia

    en.wikipedia.org/wiki/Liquefied_petroleum_gas

    These specifications are published by the Gas Processors Association (GPA) [10] and the American Society of Testing and Materials. [11] Propane/butane blends are also listed in these specifications. Propylene , butylenes and various other hydrocarbons are usually also present in small concentrations such as C 2 H 6 , CH 4 , and C 3 H 8 .