When LPG (liquefied petroleum gas) is used in a stove or any other gas appliance, it is designed in a way to prevent the fire from traveling back into the gas container and causing an explosion. This safety is achieved through several features and mechanisms:
One-way valve: The gas container (commonly known as a gas cylinder) is equipped with a one-way valve or check valve at the outlet. This valve allows the flow of gas only in one direction, from the cylinder to the stove. It prevents the gas from flowing back into the cylinder when the stove is turned on or when there is pressure in the gas lines.
Pressure regulation: LPG cylinders are filled with gas under high pressure. However, the pressure of the gas at the stove's burner is regulated through a pressure regulator. The regulator reduces the high pressure from the cylinder to a safe and manageable level before supplying the gas to the stove. This controlled pressure helps ensure that the flame remains stable and contained within the burner.
Air mixture: The stove is designed in such a way that it draws the right amount of air to mix with the LPG before it reaches the burner. The correct air-to-gas ratio is crucial for combustion, and a well-designed stove ensures that the flame burns only at the burner and doesn't propagate back into the gas supply line.
Flame failure devices: Many modern stoves come equipped with a safety feature known as a flame failure device (FFD). FFDs use a thermocouple or sensor to detect if the flame is present. If the flame goes out accidentally (e.g., due to a gust of wind or low gas pressure), the FFD automatically shuts off the gas supply to prevent the uncontrolled release of gas.
Sealed gas lines: The gas lines from the regulator to the burner are typically sealed to minimize any potential leakage and prevent the flame from spreading back to the gas container.
Safety standards and regulations: Gas appliances are subject to strict safety standards and regulations to ensure their safe operation. Manufacturers follow these guidelines to design appliances that minimize the risk of accidents.
Despite these safety measures, it's essential to handle LPG cylinders and gas appliances with care and follow the manufacturer's instructions for their safe use. Regular maintenance and inspection of gas equipment by qualified technicians can further ensure safety and prevent potential hazards.