In our homes, we have two forms of energy for heating and cooking. One is electricity. We have electric furnaces and ovens. Electricity cannot "leak" out of a loose connection. A short circuit or other similar problem can cause a hazard or fire but, that is another story. This article will deal with the other type of energy source - gaseous fuels.

 

Each of the two types of common gasses, natural gas and propane, have some different and some similar properties. This article will deal with the dangers of a leak with either one.

 

Both natural gas and propane are flammable. Both can be ignited with a small spark. Both gasses have a "flammable range;" a percent of gas in the atmosphere that will ignite and burn. If there is too small of a percentage of gas in the air, it is considered too "lean" to burn, just like the mixture in a carburetor. Conversely, if there is too high of a mixture, it is considered too "rich" and will also not burn. However, when the mixture is within the flammable range and it finds an ignition source, it can explode. Fortunately, in most leak situations, the range is too lean and does not ignite.

 

The smallest spark can ignite the gasses when in the proper flammable range. The spark can be produced from any electric device, no matter how small. This includes the spark generated from a light switch or other type of switch (such as those on an appliance). Electric motors such as exhaust fans, ceiling fans or garbage disposals also create sparks. A spark from a doorbell or telephone ringing can also be sufficient to ignite the gas.

 

This is why you should call to report a gas leak from a neighbor's home. It is also why the gas service representative or fire department, in responding to a call of an odor of gas, will knock on your door rather than ring the bell. A static electricity spark can also ignite the gas. The main difference in the properties of natural gas and propane is the weight of the gasses. Natural gas is lighter than air and will rise until it encounters an obstruction, such as your ceiling. It will collect up there until it is vented and dissipates.

 

Propane, on the other hand, is heavier than air and will run down hill and collect in low spots. It is more difficult to dissipate. Both gasses normally do not have a pronounced odor. So, to allow easy detection of the gasses by homeowners, each has an odorant added. We are all familiar with the unmistakable odor of gas.

 

If you detect the slight odor of gas, call your gas company to advise them and they will send a service person to check for leaks and make any repairs necessary. However, if you have a strong smell of gas, do not hesitate to call the fire department. Never attempt to repair a gas leak yourself. A qualified repair person will assure the job is done right.