How to Resolve Malfunctions of Combustible Gas Detectors?
(1) Identify the potential leakage points of the device to be monitored, analyze factors such as leakage pressure and direction, and draw a distribution
map of probe positions. Classify the device into three levels based on the severity of the leakage: Level I, Level II, and Level III.
(2) Based on specific factors such as airflow direction and wind direction in the location, determine the direction of leakage of flammable and toxic gases when a large amount of leakage occurs.
(3) Based on the density of the leaked gas (greater or less than air), combined with the trend of air flow, a three-dimensional flow trend chart of the leak is synthesized, and an initial setting plan is made at the downstream position of its flow.
(4) Study whether the leakage state of the leakage point is micro leakage or jet like. If it is a minor leak, the location of the point should be closer to the leak point. If it is a jet leak, it should be kept slightly away from the leak point. Based on these situations, formulate the final point setting plan. In this way, the quantity and variety that need to be purchased can be estimated.
(5) For places with significant combustible gas leaks, a detection point should be set up every 10-20m according to relevant regulations. For unmanned small and discontinuous pump rooms, attention should be paid to the possibility of combustible gas leakage. Generally, an AS-525 detector should be installed at the downwind outlet.
(6) For locations with hydrogen gas leaks, the AS-525 detector should be installed on a flat surface above the leak point.
(7) For media with a gas density greater than air, the AS-525 detector should be installed on a plane below the leakage point, and attention should be paid to the characteristics of the surrounding environment. Special attention should be paid to the setting of safety monitoring points in places where flammable gases are prone to accumulate.
(8) For open environments where flammable and toxic gases diffuse and escape, without good ventilation conditions, it is also easy for the concentration of flammable and toxic gases in a certain part of the air to approach or reach the lower limit concentration. These are important safety monitoring points that cannot be ignored.
According to the analysis of the on-site accidents, more than half of them were caused by incorrect installation and calibration. Therefore, it is necessary to introduce the precautions for correct installation and verification to reduce malfunctions.
