Well fluids are a complex mixture of liquid hydrocarbons, gas, water, and some impurities. The water and impurities must be removed before the hydrocarbons are stored, transported, and sold. Liquid hydrocarbons and objectionable impurities must also be removed from natural gas before gas goes to a sales line. A separator is a piece of equipment used to separate wellstream gas from free liquids. The size of the separator depends on the rate of natural gas flow and/or liquids going into the vessel.

Aluminum, plastic, or other material used to separate folds of pleated media to create channels for the air to flow through

Porous plastic, electrically insulating sheets which allow transfer of ions between plates, but prevent physical contact between plates and resulting electronic conduction

Bar-coded sheets that are used in the middle of a job for accounting purposes.

Thin support poles pushed into each layer of cake at evenly spaced intervals in order to support the next layer up. Separators prevent the cake layer from sinking into the layer below, and are invisible once the cake has been decorated.

Symbols used to separate items in a list, mark the thousands place in numbers, or represent a decimal point. Different locales follow different conventions for separators.