English to Czech Tech/Engineering Petroleum Eng/Sci gas combustion

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The pipe flare is the most basic type of flare tip. It is sometimes called a "utility flare". The tip includes a flame retention device along with a pilot. The upper portion is typically constructed of 310SS and the lower portion of carbon steel.
The main purpose of a utility flare is to safely ignite the flare gas at any flow rate and under any environmental condition. This basic flare design is often the most appropriate solution to emergency flaring applications and for light natural gas vents. A utility flare tip can be as simple as an open pipe with flame stabilizers or as complex as a variable orifice sonic flare tip.

http://www.heroflare.com/utility-flares.html
http://www.callidus.com/FLARES/Pages/default.aspx