CNG - Compressed Natural Gas

What exactly is CNG?

CNG or compressed natural gas is a domestically available, economical, clean burning, alternative fuel source for vehicles. 

compressed natural gas

Rather than burn gasoline or diesel fuel, a consumer would fuel their vehicle with natural gas.  In order to provide enough range, the gas is compressed and stored on the vehicle in pressurized tanks. Tanks that can hold up to 3,600 psig. 

Sounds a little scary doesn't it? Not when you compare the physical properties of Natural Gas and gasoline. The fact is that natural gas is a much safer fuel than gasoline. (Ever wonder why the stove in your home doesn't burn gasoline instead of natural gas?) Just take a look at the chart below for some interesting facts:

PROPERTIESGASOLINE DIESEL No. 2

LPG (HD-5)

CNG

Physical State

LIQUIDLIQUID

GAS

GAS

Boiling Range

(oF @ 1 atm)

80 to 420

320 to 720

-44 to 31

-259a

Density (lb/ft3)

(lb/gal)

 

43 to 49

5.8 to 6.5

49 to 55

6.5 to 7.3

31b

4.1b

8c

1.07c

Net Energy Content

Btu/lb.

Btu/gal.

18,700 - 19,100

112,000 - 121,000

18,900

123,000 - 128,000

19,800

82,000

21,300a

22,800a

Autoignition
Temperature
(
oF)

450 - 900

400 - 500

920 - 1,020

1,350

Flashpoint
(
oF)

-45

125 (min)

-100 to -150

-300

Octane Number Range
(R+M) 2

87 to 93

n/a

104e

120e

Flammability Limits

(volume % in air)

L = 1.4

H = 7.6

L = 0.7

H = 5.0

L = 2.4

H = 9.6

L = 5.3

H = 14

Human Exposure Limit For Fuel (ppm)

500n/an/a nontoxic

 

What is Natural Gas? 

Natural Gas is an organic compound that is found deep within the earth. It is a fossil fuel formed over millions of years of geological pressures and changes. Natural gas is primarily methane comprised of hydrogen and carbon. It is a safe fuel source that is commonly used in homes and businesses for heating, lighting and cooking. 

How is Natural Gas used for powering vehicles? 

This is accomplished by the following steps:

  1. Natural gas is compressed and enters the vehicle through the natural gas dispenser or fill post
  2. It flows into high-pressure cylinders that are located on the vehicle. 
  3. When the driver steps on the accelerator, the natural gas leaves the on-board storage cylinder, passes through the high-pressure fuel line and enters the engine compartment.
  4. Gas then enters the regulator, which reduces pressure from up to 3,600 psi to approximately atmospheric pressure. 
  5. The natural gas solenoid valve allows natural gas to pass from the regulator into the gas mixer or fuel injectors.
  6. Natural gas mixed with air flows down through the carburetor or fuel injection system and enters the engine's combustion chambers.

Are Natural Gas Powered Vehicles safe?

Natural Gas an ideal fuel source for many reasons, including safety. Refer to the chart above and note the following.

Natural Gas is lighter than air. This means that it will not puddle (like gasoline) or sink to the ground like propane, which is heavier than air. Instead, Natural Gas will rise and dissipate in the atmosphere.

Natural gas also has a higher ignition temperature. This means that it is much harder to ignite. Also the storage systems used for compressed natural gas are infinitely stronger that the gasoline tanks found on cars and trucks today.

 


MAILING:PHONE: SHIPPING:
P.C. McKenzie Company
P.O. Box 112638
Pittsburgh, PA 15241
1-877-244-4883
Fax: 412-257-8890
Phone: 412-257-8866
P.C. McKenzie Company
1365 McLaughlin Run Road
Pittsburgh, PA 15241

 

 What is CNG?