When is a hissing propane tank dangerous during a heatwave? Fire Brigade East Limburg offers tips to recognize trouble

The East Limburg Fire Brigade is receiving numerous calls from concerned citizens hearing their propane tanks hiss. High temperatures are causing gas pressure inside these tanks to rise significantly.

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It is important that people know when to call emergency services and when the tank is simply doing what it should be doing.

"It is important that people know when to call emergency services and when the tank is simply doing what it should be doing," says spokesperson Karen De Smedt. While most tanks have safety systems, it's not always clear to the public when a situation becomes unsafe. The fire department aims to help distinguish between genuine danger signals and normal pressure regulation.

"A hissing propane tank sounds like an alarm bell to many, but in most cases, it's just the built-in safety mechanism," the fire brigade explains. "Due to the extreme temperatures, the pressure in the tank can increase. To prevent this pressure from becoming too high, every tank is equipped with an overpressure valve." When pressure gets too high, this valve briefly releases gas, lowering the pressure inside the tank.

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A hissing propane tank sounds like an alarm bell to many, but in most cases, it's just the built-in safety mechanism.

According to the fire department, a loud hiss or whistle for a few minutes, or even a short puff, is therefore completely normal. This process releases a small amount of gas, which can cause a temporary gas odor. "Wait a moment," advises De Smedt. "The safety cap over the valve automatically closes once the pressure has sufficiently decreased. The sound and gas smell will then disappear on their own, and the tank is safe again." The protective cap might even fly off due to the force of the release. "That's harmless," the fire department assures. "Just put the cap back on afterward to prevent water or dirt from entering the valve."

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Due to the extreme temperatures, the pressure in the tank can increase. To prevent this pressure from becoming too high, every tank is equipped with an overpressure valve.

However, the fire department urges vigilance for abnormal situations. They recommend calling 112 immediately for an inspection if the tank continues to hiss or whistle constantly for several minutes, or if a clear gas odor persists for a long time. Preventive measures include shading the tank from direct sun, ensuring the pressure release valve remains unobstructed, and cautiously cooling the tank with water during venting, being careful not to spray water into the valve if the cap is off.

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