When gas lines, tanks, or appliances give you a pinging or knocking sound, it's likely due to problems with the air/gas mixture. When this mixture is uneven flow in the gas lines will not move evenly (similar to the water hammer noise you can get when there's air in the plumbing).
The only sound you should hear from a standard meter is a muffled gas sound (compressed, muffled fluid sound in the pipe).
The noise you are most likely hearing is a high-pitched hum, caused by turbulent flow in some pipe fitting. Most frequently, the source is an undersized or too lengthy flexible pipe fitting. If you notice, black iron pipes have straight smooth sides.
If gas is leaking from a pipe, appliance, or behind a wall, you may hear hissing or a whistling noise. Sometimes you can hear this hissing sound from a loose connection. The louder the whistling noise the more substantial the leak.
It's normal, a constant slight 'hiss' type noise is just the gas flowing, a slight pulsing or clunking is just the bellows and armature moving inside the meter. If it gets too noticeable just ring your supplier and tell them to arrange an exchange. Not dangerous in the slightest.
Normally that only occurs when gas is being fed to a furnace or pilot light, but it also sounds when gas is escaping from a joint, seam, or hole. If you suspect a leak, either from a gas alarm, foul smell, or loud hissing, shut off your gas main line and consult a professional for repair.
Pressure reduction and noise
As natural gas passes through the restricted portion of the control valve, the pressure decreases, and gas velocity increases significantly. This turbulent flow generates noise that travels down the pipeline, radiating in all directions.
If a gas leak is present, a spark is all it takes to ignite a fire or cause an explosion. Older buildings generally have a higher risk of gas line leaks because they have had more time to experience wear and tear and are more likely to feature rigid piping.
Popping. This could be a sign of moisture in the gas line, or that the gas line has become clogged. Clanking. More common in older systems, this is a sound you may hear when you start the furnace.
Squeaking or whistling noisy pipes indicate something is wrong with the flow of water through the pipes. There could be an obstruction in the plumbing line. There could be a defective washer or aerator if the sound is coming from a faucet. Your shut-off valve may be partly closed.
The whistling noise could be attributed to the gas pressure supply being too high. If the gas pressure running through the line is too high, the velocity of the gas can cause the whistle sound. HPC recommends contacting a certified gas plumber to determine how much gas pressure is going through the flex line.
An Obstruction in the Gas Supply
Even tiny dirt or dust particles can disrupt gas flow through the line. When this happens, the pressure of the gas moving against the object obstructing the line produces an audible whistling noise. Solution: Have a licensed professional come to your home to inspect your gas lines.
A major gas leak happens in the U.S. every 40 hours. To protect public health, safety and the environment, ask your state representatives to put an end to new gas infrastructure.
Gas leaks can escalate quickly and lead to explosions. Avoid Staying Indoors: Do not stay inside to open windows or doors.
We find gas leaks often. It never fails - at least once a month on an inspection, I will notice that characteristic odor of Mercaptan, the odoroant added to natural gas to make sure that it is noticed. It smells like nothing else, and it's so distinctive that it can be identified even in extremely small quantities.
“Call for 911 and have a fire department respond. We have gas monitors so we can get there and try to detect where it's coming from and where most of it is.” Another way to prepare is to have your gas pipes and systems checked regularly, especially if you own an older home.
What is the life expectancy of a gas line? A natural gas line can last as long as fifty years, even longer. But, being buried underground, they will corrode, become worn, and start to crack as the metal weakens. This can often start between 20 and 30 years.
Natural gas has no odor. Gas companies add a harmless chemical called mercaptan to give it its distinctive “rotten egg” smell. All natural gas and propane pipeline gas in Connecticut is odorized. If you smell gas near an appliance, it may be just a pilot light that has gone out or a burner valve that is open slightly.
When a gas line has a hole or crack, the fuel will escape. Some of these holes are too tiny to detect with your naked eyes. However, you can hear the sound of gas escaping through the crack regardless of how small it is. The hissing sound is notable as the gas exits the pipe.
A slight change in flow of the fuel may cause a drift in the natural frequency of the system, in turn, causing the piping to vibrate when high heat is required. You may want to check all the piping fasteners as they tend to get loose with vibration. Additional fasteners may be needed.
A rumbling noise that occurs when the burners are on typically means that burners are dirty. Contact our chimney professionals to have your burners properly cleaned. If there is a roaring sound that occurs when the pilot light is on, it is usually because the flame needs to be adjusted.