Talk:Compressed natural gas

message: An ICE has a low efficiency in a car. Since compressed natural gas cars have only a short range, they are mostly used in city traffic, where the ICE has an even worse efficiency.
When the gas is instead used in a Molten-carbonate fuel cell with Steam turbine behind to produce electricity with 64% efficiency, a Plug-in hybrid or Battery electric vehicle could drive 4 times more km with the same gas than an ICE car. --Pege.founder 06:34, 2 August 2006 (UTC)
thread_title:  Efficiency compared to MCFC and electric mobility 

message: Unity_%28Superman:_The_Animated_Series%29
The female of the alien Unity was killed when Supergirl threw a can of compressed flammable gas, possibly Compressed_natural_gas, at it, which embedded into the creature, she then ignited the gas canister with her heat vision, which exploded in a giant fireball, blasting the creature apart.
:I think you should discuss this “super girl” subject elsewhere. This is not appropriate to this article.Ragingmaster 17:20, 18 October 2007 (UTC)
thread_title:  SuperGirl uses CNG as a weapon? 

message: Is it true that CNG is weaker than gasoline. It's quite a common rumor; I'm not sure if it's true. By weaker I mean: slower acceleration, less towing power, etc. If this is true, why is CNG used in transit?  —Preceding unsigned comment added by Zybez (talk • contribs) 02:16, August 29, 2007 (UTC) 
:It is much cheaper then all other kinds of common fuel, and it is environmentally superior, emitting considerably less pollution to the atmosphere. And yes, it really is “weaker” then other kinds of fuel (5% less power to de vehicle), but this is more a matter of technology than of the fuel itself. I believe that, with time, the engines will adapt better to this kind of energy. Ragingmaster 17:02, 18 October 2007 (UTC)
replies: text: In the same engine, CNG will indeed produce less power in a gasoline designed engine that has not taken advantage of the higher octane rating of CNG (130+).  This is due to the fact that an internal combustion engine's power is determined, in a large part, by compression ratio which the most significant factor is limited by octane rating.  Natural Gas requires more oxygen per unit energy produced than gasoline, therefore, in the exact same engine, it would produce less power running CNG.  However, in an engine designed for CNG, this can be made up for with more aggresive timing and higher compression, due to the high octane rating of CNG. CraziFuzzy (talk) 09:19, 7 June 2008 (UTC)
thread_title:  CNG has less energy than gasoline? 

message: I have read the articles on previous pages, however what I want to know is: I have a LPG converted panelvan, can I use the same set-up with CNG eg gas tank and carburator/injecters and refuel from my house mains gas supply with an appropriate compressor?  —Preceding unsigned comment added by 210.9.221.28 (talk) 11:37, 4 May 2008 (UTC)
replies: text: As of April 2009, FuelMaker of Toronto, Canada, the original maker of Phill is dead.  The assets of FuelMaker were purchased by Fuel Systems Solutions] of Santa Ana, California, which subsequently moved its headquarters to New York City.  The Phill units are still being made in Cherasco, Italy by their BRC FuelMaker subsidiary, but you can't buy one in the U.S., as far as I know; they're only available on lease for about US$50 per month, making them uneconomical for low-use motorists.  I've seen numbers in the vicinity of $5,000 to get a home CNG refueling station set up, when you figure in the cost of special electrical wiring and gas plumbing.  In California and other places where they use "baseline usage" billing for electricity and natural gas it's a particular concern, because the additional gas and electric usage for refueling a car would consistently put the utility customer into the second or third rate tier, making it prohibitively expensive to light and heat one's house.  One way to avoid that is to have secondary gas and electric meters installed just for the refueling station, which entails paying for permits and professional installation services. — QuicksilverT @ 21:02, 31 October 2012 (UTC)
thread_title:  Natural gas automobile 

message: This article covers Canada, Europe, South America, and Asia, but not the United States. I am not knowledgable about this topic, but perhaps someone who is could add such a section.  —Preceding unsigned comment added by 217.85.118.228 (talk) 08:01, 6 June 2008 (UTC)
replies: text: *Started United States section.  Feel free to elaborate, as I just started with a summary of current situation. CraziFuzzy (talk) 08:34, 8 June 2008 (UTC)

text: The cost to convert a passenger car to CNG is more on the order of US$2,000, according to some numbers I've stumble upon on the 'net. — QuicksilverT @ 21:02, 31 October 2012 (UTC)

text: *As of March 2015, the entire United States section of the article seems dated.
I started to update it, but my first set of edits got reverted.
http://en.wikipedia.org/w/index.php?title=Compressed_natural_gas&diff=654176811&oldid=654173378
The cites included a government alternate energy website and the Texas Railroad Commissioner (who collects taxes for CNG fuels sales).
I disagree with the reversion, but I will leave it to others to re-perform the edits.
Gregfreemyer (talk) 14:38, 30 March 2015 (UTC)
thread_title:  America? 

message: Like the above "America?" section. Japan is the biggest producer of CNG vehicles. Why isn't even the word "Japan" on article at all? Maybe there is some one with knowledge of the subject for Japan that can write some information...? I heard there was a CNG Pirus in Japan but don't know if it is true?  —Preceding unsigned comment added by 85.222.86.38 (talk) 10:25, 11 June 2008 (UTC)
thread_title:  Japan? 

message: The article mentions the interest from environmental grounds of CNG, but does not talk about the Global warming potential of it relative to refined extracted petroleum.  This article from travelmatters.com claims that CNG has higher GWP, due to the normally incomplete combustion of methane in  CNG engines.  I haven't found exact figures comparing GWP; still it seems that this topic needs a mention in the article. --- Charles Stewart(talk) 18:51, 28 August 2008 (UTC)
replies: text: And hydrogen isn't a fuel, it's an Energy carrier not a Primary energy source like methane. "Greenhouse" gases are emitted during the production of hydrogen. There's no free lunch here. Santamoly (talk) 16:22, 20 October 2011 (UTC)

text: Global warming potential is irrelevant.  The carbon cycle is a closed cycle.  Whatever energy comes out of burning hydrocarbons is eventually recaptured in the formation of new hydrocarbon compounds.  Instead of talking about global warming potential, we should be considering the profit-making potential of people who push such alarmist rubbish on society. — QuicksilverT @ 21:02, 31 October 2012 (UTC)
replies: text: The key word is "eventually".  There is a time delay before any recapture, which allows greenhouse gases to accumulate.  The result depends on the rates of various processes.  The recapture rate won't automatically increase with increasing CO2 emissions, but rather with increasing levels.  Thus, increased emission of CO2 raises its equilibrium level in the atmosphere, which then raises its actual level and its ability to trap infrared radiation. 24.93.23.139 (talk) 03:48, 1 September 2013 (UTC)
thread_title:  Global warming potential 

message: Propane has an equivalent octane rating of around 100 which allows the use of engines designed to use a 12:1 compression ratio.  This yields much more power than a gasoline engine (8 to 10 : 1 compression).  Merely converting the fuel used in a gasoline engine to natural gas or propane will NOT be an optimal conversion unless there are substantial modifications such domed pistons or smaller cylinder head combustion chambers which either or in combination would increase the compression ratio.  The question is: does compressed nat gas have the very high octane rating that propane has?  Homebuilding (talk) 22:37, 8 March 2009 (UTC)
thread_title: "Octane" rating is important

message: In the ready to burn state, CNG has HALF the BTUs of propane.  This accounts for the more sophisticated tanks and higher pressures.Homebuilding (talk) 22:37, 8 March 2009 (UTC)
thread_title:  CNG has HALF the BTUs of propane 

message: What is the energy density of CNG in MJ/kg ?
--68.0.124.33 (talk) 00:35, 8 October 2008 (UTC)
thread_title:  Energy density 

message: I get confused between all the different "Gas" alternatives. Is there an article that gives an overview and comparison of these related fuels?  Thanks. Stepho-wrs (talk) 03:09, 31 October 2008 (UTC)
thread_title:  Comparisons with LPG, LNG, etc 

message: sir,if cng is directly injected in to the combustion chamberof conventional cng engine , is it nessesary to change exhaust manifold  —Preceding unsigned comment added by 59.160.18.209 (talk) 08:53, 29 January 2009 (UTC)
thread_title:  CNG direct injection 

message: The rupee price needs to be dates since obviously it is subject to change. Such as "On 1 January 2009, the price in India was"... SimonTrew (talk) 08:02, 22 March 2009 (UTC)
thread_title:  India (rupee price) 

message: About compressed natural gas in Brazil, I must write that compressed natural gas has being used in Brazil, in commercial basis, since 1991.Agre22 (talk) 16:19, 27 October 2009 (UTC)
thread_title: Compressed natural gas in Brazil

message: Is it possible to add a section energy recovery ? About generator loaded expanders and compressor loaded expanders ? Thanks Mion (talk) 11:15, 4 November 2009 (UTC)
thread_title: Energy recovery

message: Seems to me a section ought to be added to at least generically cover the topic of gas quality specifications regarding CNG.  For example, California has CARB standards (13 CCR §2292.5) and NFPA 52 has standards (originally?) based on SAE J1616.  Obviously other standards would apply in other countries as well.  At a minimum, components and contaminants covered by such specifications could be bullet-listed.  At the other extreme (of detail), a table could be added comparing standards from various locations.  Sound reasonable or should this be a separate topic? CheMechanical (talk) 00:01, 19 May 2010 (UTC)
thread_title:  Gas quality specifications 

message: As Petrol and Diesel give more mileage per litre at which price difference ratio between the fuels  would it be uneconomical to fill up with CNG? Would anybody know the answer to this. Maybe this could be interwoven into the article. Many thanks  —Preceding unsigned comment added by 87.194.73.120 (talk) 19:27, 14 September 2010 (UTC)
thread_title:  When is it not worth buying CNG 

message: It is true that at its peak 10% of road vehicles in New Zealand had dual fuel conversions; this figure includes both the LPG/petrol and CNG/petrol conversions then available.
A government subsidy was available in the form of an interest free loan covering the cost of these conversions.  
In practice it was discovered the CNG conversion option had many tuning problems, which when added to the limited range of CNG vehicles, made these conversions less practical than equivalent LPG conversions.
Consequently all CNG filling stations eventually were closed, the equipment sold overseas.  New Zealand now has only one CNG filling station, close to a drag strip.
Government subsidies eventually were dropped.  Without the government subsidies automotive gas conversions became impractical.  The price of LPG rose.  Distributors offer a discount to bulk users of LPG; consequently LPG became uneconomic as an automotive fuel unless used in a high mileage vehicle.  It is now used as a fuel in the taxi industry, but rarely otherwise.  
Manufacturers now offer factory built LPG dedicated vehicles, which solve the tuning problems inherent in aftermarket fuel conversions.  These vehicles are only offered for sale to taxi operators.
203.173.245.28 (talk) 20:40, 19 December 2010 (UTC)
thread_title:  New Zealand experience with alternative automotive fuels 

message: does it is possibel to convert a diesel enigen to cng  — Preceding unsigned comment added by Ksy.ysk (talk • contribs) 07:19, 4 July 2011 (UTC)
replies: text: Yes, but to pass new emissions tests, more modifications such as EGR are needed.  Westport Innovations is one such developer. Santamoly (talk) 16:31, 20 October 2011 (UTC)

text: There are buses and trucks with Diesel engines running with compressed natural gas (CNG) and liquefied natural gas (LNG).  It is not only possible to convert a Diesel engine to CNG, it is being done commercially. — QuicksilverT @ 20:23, 31 October 2012 (UTC)
thread_title:  Diesel to CNG 

message: Please, someone, fix the dead link.  I tried it, and you have to click on another link, and then another, to get to: <www.winetrain.com/ontrack/news-rail-yard>, which is where the last of the tech info is, but you have to look for those links, and I'm sure that's what confused the bot.    Sorry, footnote number 6 (or 5?)  I'm not able to make the correction.  (Handheld, and the browser's not cooperating.)   Thanks!
Ragityman  — Preceding unsigned comment added by 69.171.187.79 (talk) 20:34, 4 February 2012 (UTC)
thread_title: Dead link

message: "CNG may also be mixed with biogas (produced from landfills or wastewater), resulting in a fuel that does not increase the concentration of carbon in the atmosphere."
Mixed or produced from?  If mixed then it will still increase CO2 concentration, just at a reduced rate. 
"It is stored and distributed in hard containers at a pressure of 200–248 bar (2,900–3,600 psi), usually in cylindrical or spherical shapes".  I am interested to know what storage methods are not steel, or not cylinders or spheres?  If it's a small niche application then I think being more specific is more helpful... 'it is almost always stored in steel gas cylinders or spheres'
Mike163 (talk) 00:20, 19 May 2013 (UTC)
thread_title:  Carbon neutral? 

message: The last section has very little detail, and following the cited link the article is no longer hosted. The link does give the name of a company, however a search of that company doesn't reveal anything relating to diesel natural gas.  — Preceding unsigned comment added by 71.74.116.157 (talk) 04:07, 4 April 2014 (UTC)
thread_title:  DNG 

message: I think the overall thermal efficiency of a CNG system must be very low because a lot of energy will be wasted as heat during compression and this energy will not be recovered when the gas is burned.  I suspect that CNG is only cost-effective because of the tax advantages.  Could we please have some information on overall thermal efficiency in the article? Biscuittin (talk) 14:14, 9 August 2014 (UTC)
replies: text: I can't find anything about this on the internet. The energy (presumably electrical energy) used to compress the gas just seems to be ignored. Biscuittin (talk) 14:39, 9 August 2014 (UTC)
thread_title:  Thermal efficiency 

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message: The article states:
"... CNG is gas that is stored (as a gas) at high pressure ..."
I would like to challenge this. The critical point (thermodynamics) of methane is at 190.6 K (−82.6 °C), 46 bar. CNG storage conditions are well above both, critical pressure and temperature. I contend that CNG is neither clearly gas nor liquid, but a supercritical fluid. Any thoughts? Tomeasy T C 23:37, 16 September 2016 (UTC)
thread_title:  supercritical fluid 

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message: Hi, I hereby request you to start a CNG bank.  People in our area have already bought cars.  Cars and other goods vehicles.  have taken  Therefore, they request to start a CNG bank.  Mahipal Reddy Police Patil Our car number is KA33M9756 CNG Car my 9972367434 171.76.218.211 (talk) 19:21, 28 March 2023 (UTC)
thread_title:  New CNG pump