Lyla Lindsey
Natural gas is odourless, colourless, and tasteless, so utility companies in Australia add a harmless chemical called mercaptan to make gas detectable to humans. This additive is responsible for the distinctive rotten egg-like smell associated with a gas leak. Some have also described the smell as similar to garlic or onions. If you smell this odour, you should leave the area immediately and call your local gas company or the fire department.
| Characteristics | Values |
|---|---|
| Natural gas | Odourless, colourless, and tasteless |
| Additives | Mercaptan, tert-Butylthiol (t-butyl mercaptan) |
| Smell with additives | Rotten eggs, garlic, onions, cabbage |
| Other indicators of a gas leak | Hissing sounds, dead or dying plants near the outdoor gas line, discoloured flame, shortness of breath |
| Action to take | Leave the area immediately, open windows and doors, shut off the main gas line, call a professional gas fitter |
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What You'll Learn
Natural gas is odourless, so mercaptan is added to detect leaks
Natural gas is naturally odourless, colourless, and highly flammable. It is primarily composed of methane, which is also a component of biogas. While natural gas is a relatively safe energy source, it may be dangerous when there are leaks. When inhaled, carbon monoxide from natural gas builds up in the body, replacing the oxygen in the blood, which can lead to cell death.
To help detect leaks, gas companies add a chemical called mercaptan to natural gas, giving it a strong, pungent, and unpleasant odour. Mercaptan, also known as ethanethiol, is a sulfur compound with the chemical formula CH3CH2SH. It is a clear liquid with a very distinct odour, often described as smelling like rotten eggs, cabbage, or garlic.
The addition of mercaptan is a safety measure, as it enables people to quickly identify a potential gas leak. If you smell mercaptan, it is important to act immediately. Leave the area, shut off the gas at the mains, and contact a professional gas fitter. Do not try to locate the source of the leak, as gas leaks can be extremely dangerous and even fatal.
While mercaptan is added to natural gas to aid in leak detection, it is important to note that there are rare instances where the mercaptan odour can fade. This can occur due to adsorption, absorption, or oxidation. Adsorption happens when the odour 'sticks' to the inside walls of the gas bottle, while absorption refers to the odour being absorbed by another substance, such as water. Oxidation occurs when the inside of the gas bottle is exposed to air, resulting in a chemical reaction that causes the gas to lose its odour.
In conclusion, natural gas is odourless in its natural state, so mercaptan is added as a safety measure to help detect leaks. If you suspect a gas leak, always prioritise your safety by leaving the area and seeking professional assistance.
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Gas leaks smell like rotten eggs or garlic
Natural gas is odourless and usually safe. However, it can be dangerous when there are leaks. In Australia, an additive called mercaptan is added to natural gas to help people identify a gas leak. This additive is what gives natural gas its distinctive rotten egg or garlic smell.
If you smell rotten eggs or garlic, you may have a gas leak. To confirm this, you can use your senses of smell, sight, and sound. The smell of rotten eggs or garlic will be strong and pungent. You may also hear a hissing sound from the appliance attached to the gas line, such as a gas stove, oven, or dryer. Additionally, look out for dust or dirt blowing near a gas line when there is no wind, or for bubbles in a body of water above a gas line. If you suspect a gas leak, do not panic. Leave the building immediately and call a professional gas fitter.
It is important to note that the smell of rotten eggs or garlic may also be caused by certain foods you eat. For example, if you consume sulfur-rich foods such as meats, eggs, grains, cruciferous vegetables, or dairy products, your flatulence may smell like rotten eggs due to the sulfur content. This is especially true if you have a sensitivity or intolerance to certain foods, or if you have digestive issues. However, if the smell of rotten eggs or garlic is sudden and not accompanied by other digestive symptoms, it is more likely to be a gas leak.
In summary, if you smell rotten eggs or garlic and suspect a gas leak, do not ignore it. Take the necessary steps to ensure your safety and contact a professional for assistance.
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A hissing sound could indicate a gas leak
Natural gas is odourless and colourless, so manufacturers add a chemical called mercaptan, which smells like rotten eggs or sulphur, to alert people to its presence. However, a hissing sound could also indicate a gas leak. This sound is caused by gas flowing through restricted pathways or small holes due to a blockage or hole in the system. The gas leak could be coming from an appliance, a pipe, or even from behind a wall. The louder the hissing noise, the bigger the gas leak.
If you hear a hissing sound, try to identify the general area or source. Gas stoves, ovens, dryers, and furnaces are the most common sources. If you can, turn off the appliance and its gas supply, then ventilate your home by opening doors and windows and turning on fans. Avoid any sources of ignition, such as sparks, open flames, or high heat. If the hissing sound continues, contact a professional gas fitter for assistance.
It is important to act quickly if you suspect a gas leak, as they can be extremely dangerous and can lead to carbon monoxide poisoning. If you smell gas or suspect a leak, do not panic. Open windows and doors to prevent a gas build-up, then leave the building and shut off the main gas line or valves if it is safe to do so. If the smell of gas is strong, evacuate the building immediately and contact your local gas company or fire department.
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Dead plants may signal an underground gas leak
Natural gas is odourless, so a chemical called mercaptan is added to give it a distinct odour, often described as smelling like rotten eggs or garlic. This helps people to detect gas leaks, which can be extremely dangerous. If you suspect a gas leak, you should not panic, but you must act quickly. Use your senses of smell, sound, and sight to detect the leak, then leave the building and call a professional gas fitter.
While the smell of gas is the most well-known sign of a leak, there are other warning signs to look out for, especially when it comes to underground gas leaks. Dead plants or grass can be a sign of an underground gas leak, as gas escaping from a buried pipeline can remove oxygen from the soil, causing nearby vegetation to die. Small flies or gnats swarming in the area could be another indicator, as they are attracted to the odorant in natural gas.
If you notice dead plants or grass near your gas meter or in other areas where gas pipes may be located underground, take it seriously and do not ignore it. Call your gas company to come and inspect the area. They will have the necessary equipment, such as "sniffers", to detect a gas leak. It is better to be safe than sorry when it comes to gas leaks, as they can be hazardous and even fatal.
In addition to dead plants, there are other warning signs of an underground gas leak. You may see bubbles rising in puddles or wet areas, or dirt blowing up from the ground without any wind, indicating gas escaping from the pipeline. A sudden increase in your gas bill without a corresponding increase in usage could also indicate a leak. If you suspect a leak, always evacuate the area and seek fresh air, and do not turn on lights or use any electrical appliances near the suspected leak.
While natural gas is generally safe, it is important to be vigilant and know how to respond in case of a gas leak. Stay alert for warning signs, follow underground gas safety measures, and always call for professional assistance if you suspect a leak.
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If you suspect a gas leak, leave the area immediately
Natural gas is odourless, but an additive called mercaptan is added to it to help people detect a gas leak. This additive makes natural gas smell like rotten eggs or garlic. If you suspect a gas leak, it is important to remain calm and follow these steps:
Detect the Leak
Use your senses of smell, sound, and sight to detect the gas leak. If you can, try to find the source of the smell. Look at your stove gas burner, other gas appliances, or the piping near your gas meter.
Turn Off All Appliances and Pilot Lights
If you can identify the source of the smell, turn off the appliance. If the smell is coming from an appliance that is turned off, switch the natural gas handle on your meter to the off position.
Open Windows and Doors
Open all doors and windows for ventilation. This will help prevent a gas buildup in your home.
Leave the Area
If you feel shortness of breath, leave the building and breathe deeply. If you feel worse when you return indoors, go outside again and seek medical help. Even if you do not feel ill, it is important to leave the area and go to a well-ventilated space.
Contact Professionals
From outside the house, call your local licensed plumber or gas fitter. If you are renting, call your real estate agent. You should also call your local gas distributor. If you are in Australia, you can call the Gas Leaks and Emergency services on 1800 GAS LEAK (1800 427 532). They will provide advice and, if necessary, arrange for an engineer to visit within 1-2 hours.
Turn Off Electricity
If possible, turn off your electricity at the fuse box. Do not operate any electrical equipment near a suspected gas leak, as this could cause a spark and start a fire.
Remember, gas leaks can be dangerous, so it is important to act quickly and calmly if you suspect a leak. Do not try to investigate the leak yourself; leave it to the professionals.
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Frequently asked questions
Natural gas is odourless, colourless and tasteless. However, mercaptan is added to natural gas to help people detect a gas leak. Mercaptan has been described as smelling like rotten eggs, garlic, or onions.
If you smell gas, it needs to be investigated and repaired by a licensed gas fitter. Do not attempt to locate the source of the leak yourself. Leave the area immediately and ensure you do not turn on or off any electrical devices or lights, as even a small spark could ignite the gas. Once in a safe location, call your local gas company or the fire department.
As you inhale gas, carbon monoxide builds up in your system, replacing the oxygen in your blood. Symptoms include shortness of breath, respiratory problems, and in severe cases, unconsciousness. If you feel worse when you return indoors, go outside and seek medical help.
A gas leak may make a noise, such as a low hissing sound. You may also notice dust or dirt blowing near a gas line, discoloured flames on gas appliances, or dead or dying plants near an outdoor gas line.
If the smell of gas is faint, open the windows and doors to prevent a gas build-up. If you feel ill, leave the building and seek medical help. If you suspect a plumbing issue, contact your local plumbers to diagnose the issue.
