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The hydrocarbon dew point is the temperature (at a given pressure) at which the hydrocarbon components of any hydrocarbon-rich gas mixture, such as natural gas, will start to condense out of the gaseous phase. It is often also referred to as the HDP or the HCDP. The maximum temperature at which such condensation takes place is called the ''cricondentherm''.〔(Hydrocarbon Dew Point )〕 The hydrocarbon dew point is a function of the gas composition as well as the pressure. The hydrocarbon dew point is universally used in the natural gas industry as an important quality parameter, stipulated in contractual specifications and enforced throughout the natural gas supply chain, from producers through processing, transmission and distribution companies to final end users. The hydrocarbon dew point of a gas is a different concept from the water dew point, the latter being the temperature (at a given pressure) at which water vapor present in a gas mixture will condense out of the gas. ==Relation of the term GPM to the hydrocarbon dew point== In the United States, the hydrocarbon dew point of processed, pipelined natural gas is related to and characterized by the term GPM which is the gallons of liquifiable hydrocarbons contained in of natural gas at a stated temperature and pressure. When the liquifiable hydrocarbons are characterized as being hexane or higher molecular weight components, they are reported as GPM (C6+).〔(White Paper on Liquid Hydrocarbon Drop Out in Natural Gas Infrastructure ) (NGC+ Liquid Hydrocarbon Dropout Task Group, October 15, 2004)〕〔(White Paper on Liquid Hydrocarbon Drop Out in Natural Gas Infrastructure ) (NGC+ Liquid Hydrocarbon Dropout Task Group, September 28, 2005)〕 However, the quality of raw produced natural gas is also often characterized by the term GPM meaning the gallons of liquifiable hydrocarbons contained in of the raw natural gas. In such cases, when the liquifiable hydrocarbons in the raw natural gas are characterized as being ethane or higher molecular weight components, they are reported as GPM (C2+). Similarly, when characterized as being propane or higher molecular weight components, they are reported as GPM (C3+).〔 (See page 110)〕 Care must be taken not to confuse the two different definitions of the term GPM. Although GPM is an additional parameter of some value, most pipeline operators and others who process, transport, distribute or use natural gas are primarily interested in the actual HCDP, rather than GPM. Furthermore, GPM and HCDP are not interchangeable and one should be careful not to confuse what each one exactly means. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrocarbon dew point」の詳細全文を読む スポンサード リンク
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