Is there any mandatory specification or requirement regarding the number of pressure monitoring points for the low-pressure low-alarm interlock after the fuel gas flame arrester in a tubular heating furnace?
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Seeking help: Is there any mandatory regulation or requirement regarding the number of pressure sensing points for the low-pressure interlock system (such as two-out-of-three) for the fuel gas pressure and the pilot light pressure after the fuel gas flame arrester in a tubular heating furnace?
There are no specific mandatory requirements, but it is recommended to design based on actual operating conditions and safety requirements; multiple pressure sampling points are usually used to ensure reliability. Such as two-out-of-three or three-out-of-four, etc. .
The number of pressure tapping points for the low-low interlock of fuel gas pressure and pilot light pressure is three out of two, which is reasonable.