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khaledfahmy Participant Join Date: Jan 2008 Posts: 4	Tech. Engineer 07/14/2008 2:21 AM
	What is the base temperature of the standard Natural gas state? Is it 32 F or 60 F and why? I have found both answers in different sources.
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Electroman Guru Join Date: Jul 2006 Location: Dunstable, England Posts: 2821 Good Answers: 45	#1 Re: Tech. Engineer 07/14/2008 8:39 AM
	In the UK the reference temperature for natural gas is 22½ degrees Celcius. From long ago I remember that this was the temperature that the natural gas is chilled to to remove moisture which could build up in pipes into hydrates or something that could cause safety/problems... John. __________________ A little knowledge is a dangerous thing - Googling is far worse!
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vicini Guru Join Date: Dec 2007 Posts: 588 Good Answers: 13	#2 Re: Tech. Engineer 07/14/2008 2:52 PM
	in the US its 60 F. Some contracts may specify different values, but the states all use 60F.
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Gasman Commentator Join Date: Jan 2006 Location: Western flank of the Pennines in Lancashire England Posts: 93 Good Answers: 8	#3 Re: Tech. Engineer 07/15/2008 8:28 AM
	It depends where you are and what system of units you are using. If you are in the EC then the system is SI and the standard conditions for calorific value of gaseous fuels is STP i.e., 0°C and 1013mbar and I think dry and gives an answer in MJ/m³, whereas the old imperial system used NTP (60°F, 14.696 psia and wet resulting in Btu/ft³). The NTP standard was chosen to to fit the prevailing practical conditions. Gas was produced from coal and stored over water in a gas holder and was therefore wet. Natural gas is normally dry unless it is being distributed in parts of the UK where we still have gas holders. It is used in the UK as part of the harmonisation of standards across the EC. Neither is more "right" than the other, each being an arbitratry choice of condition.
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khangnguyenca Active Contributor Join Date: Jun 2008 Posts: 16	#5 In reply to #3 Re: Tech. Engineer 07/15/2008 5:20 PM
	two thumbs up for you, Mr! just to add, Canadian is also using metric system but we follow the old imperial standards of 1013mbar and 15°C instead of 0°C. When you use 32F or 0°C reference temperature, you are referring to normal condition gas (normalized). when you use 60F or 15°C reference temperature, you are referring to standard condition gas (standardized).
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betomachine Power-User Join Date: Apr 2007 Location: Austin, TX Posts: 367 Good Answers: 10	#4 Re: Tech. Engineer 07/15/2008 8:57 AM
	Both, as written above, and when you get into industrial gases it sometimes can even be 70 °F. It is all part of a scheme called the standard cubic foot which is anything but standard. __________________ Money doesn't talk, it screams in your face.
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