For gas appliances, flame control devices ( FSD ) - alternate names: flame failure device ( FFD ) - is a generic term for any device designed to stop flammable gases going to a gas appliance burner if the fire goes out. This is to prevent the buildup of harmful gases in the appliance, chimney or chamber. The causes of flame failures include the decline of the chimney, interruption while the gas supply, the gas under pressure, the excess fluid on the electric stove or draft of the opened and closed oven doors.
FSD can use one of several technologies: thermoelectric valve, flame conductance, flame rectification, ultraviolet sensing device and liquid expansion valve.
The use of FSD in consumer products differs among political units - in the US, FSD is not required by law or regulation for gas range gas stoves (or gas stoves) and consequently is not present in the range in the US Cooker's electric stove may not has FSD on every burner. If a hotplate will be used in a multi-occupancy building each burner must have its own FSD.
When FSD activates it must stop (or reduce to a safe level) the gas stream to the burner until it is reset manually.
Older devices, such as bimetallic strips, are used in conjunction with pilot lights. The pilot light is no longer used in new devices, but may still be found on old equipment that is still in operation. Pilot lamps are withdrawn because their continuous small flame represents fuel waste. Pilot lights require their own FSD, usually thermocouples that hold the valve open. Regular FSD testing is part of routine maintenance for gas appliances.
Other security devices can be installed in addition to FSD. One of them is Vitiation Sensing Devices, which detects enough oxygen supply for efficient combustion, thus avoiding toxic carbon monoxide production. As well as detecting a blocked oxygen supply, it must also detect blocked exhaust or reverse flow in the exhaust due to wind conditions. Two methods are used to provide this, the Oxygen Depletion System (ODS) which measures the availability of oxygen for combustion or Atmospheric Sensing Device (ASD) measures excessive heat ups in the exhaust.
Video Flame supervision device
See also
- Flame detector
Maps Flame supervision device
References
External links
- Gas Flame Control Kit: Information at Falkirk Council, UK (Archived December 14, 2013; Accessed January 2, 2017)
Source of the article : Wikipedia
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