Engineering News Blog

Engineering News

Latest news of interest to engineers. Sourced from GlobalSpec's Engineering News

Previous in Blog: FYI: What Happens to Disarmed Nuclear Warheads?   Next in Blog: Kevin Costner Shows Machine that Extracts 97% of Oil From Water
Close
Close
Close
3 comments
Rate Comments: Nested

Will You Drive a Car That Runs on CNG?

Posted May 18, 2010 1:54 PM

From Technobabble:

America has enough natural gas to last for hundreds of years. It's plentiful, relatively inexpensive, and burns far more cleanly than coal and petroleum. Until now, compressed natural gas (CNG) has not been popular as a transportation fuel, other than for specific applications such as urban buses and garbage trucks. With all the hubbub about electric cars, most folks have never heard about CNG-powered vehicles. That's about to change. There's a new push to replace conventionally fueled vehicles with CNG-power.

Read the whole article

Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Guru
Popular Science - Weaponology - New Member Safety - ESD - New Member Hobbies - Fishing - New Member

Join Date: Sep 2006
Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E
Posts: 17996
Good Answers: 200
#1

Re: Will You Drive a Car That Runs on CNG?

05/19/2010 10:03 AM

It appears to be the future fuel, but here in Germany, where there are a lot of cars running on gas, the birth has not been easy.

1) Consumption (volume) is higher than for petrol/diesel cars, up to 40%.

2) It burns a lot hotter, so lead footed Germans have been damaging their engines, this should not be a problem for most other (speed restricted) markets.

3) Most of the cars have had to have dual systems, the engines start on gas/petrol for the first mile or so (depending upon outside temperature), then they switch to gas.

4) Like 2) above, most cars are restricted to gas/petrol only when towing due to engine temperature rise with gas. This should eventually be fixed in properly designed for gas engines of course.

5) Several conversion firms have gone bankrupt due to engines/Catalytic converters getting damaged by the heat....in the guarantee time.....

6) Some middle European countries are "forging" parts for gas installations and selling them on the open market...

7) The best point is that it costs less than half of Super Lead free here and will stay so till at least 2014, probably 2020.

__________________
"What others say about you reveals more about them, than it does you." Anon.
Reply
Guru
Popular Science - Weaponology - New Member Hobbies - Fishing - New Member

Join Date: May 2007
Location: Aloha or
Posts: 659
Good Answers: 19
#2

Re: Will You Drive a Car That Runs on CNG?

05/19/2010 4:13 PM

there is a name for the type of explosion you get when a tank of a flamable gas is released then lit. I would not want to be in a CNG car and have an accident. eventually this accident is going to happen. hopefully not in a high population area.

__________________
Closed biased minds are utterly impervious to any factual evidence which contradicts their beliefs
Reply Off Topic (Score 5)
Guru
Popular Science - Weaponology - New Member Safety - ESD - New Member Hobbies - Fishing - New Member

Join Date: Sep 2006
Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E
Posts: 17996
Good Answers: 200
#3
In reply to #2

Re: Will You Drive a Car That Runs on CNG?

05/20/2010 7:12 AM

The tanks in use are tested very extensively for possible damage when in an accident.

They come through with flying colours.

Anyone who drives a car with a petrol/gas (US petrol!) car is living just as dangerously to my mind, and many accept the consequences....which is why I drive Diesel engined cars since the mid '80s......as I don't!!

Look at the flash points of petrol and Diesel.....(I could not find it for CNC, sorry! but the Autoignition point is almost 3 times higher than petrol)

Fuel Flash point temperature
Ethanol 12.8 °C (55 °F)
Gasoline (petrol) <−40 °C (−40 °F)
Diesel >62 °C (143 °F)
Jet fuel >60 °C (140 °F)
Kerosene (paraffin oil) >38–72 °C (100–162 °F)
Vegetable oil (canola) 327 °C (620 °F)[1]
Biodiesel >130 °C (266 °F)

You may find this site with videos of CNG tanks being tested quite interesting:-

http://www.cngutah.com/faq.html#safety

(The flash point mentioned is actually the Autoignition temperature, not the flash point. Do not mix the two up)

Try that with a car petrol tank and see what happens!!!!

__________________
"What others say about you reveals more about them, than it does you." Anon.
Reply
Reply to Blog Entry 3 comments

Previous in Blog: FYI: What Happens to Disarmed Nuclear Warheads?   Next in Blog: Kevin Costner Shows Machine that Extracts 97% of Oil From Water

Advertisement