Precautions for application of combustible gas detector
Once the combustible gas detector is installed in place, its position is not easy to change. According to the work experience accumulated over the years, the following points should be considered in specific application.
(1) Find out the possible leakage points of the devices to be monitored, analyze their leakage pressure, direction and other factors, and draw the probe location distribution diagram, which can be divided into three grades according to the severity of leakage: I, II and III.
(2) Determine the leakage direction of combustible gas when a large amount of leakage occurs according to the specific factors such as air flow direction and wind direction of the location.
(3) According to the density of the leaked gas (greater than or less than air), combined with the air flow trend, the three-dimensional flow trend chart of the leakage is synthesized, and the initial point setting scheme is made at the downstream of the flow.
(4) Study whether the leakage state of the leakage point is micro leakage or spray. In case of micro leakage, the set point shall be close to the leakage point. In case of jet leakage, keep it away from the leakage point. Based on these conditions, the final site setting plan is drawn up. In this way, the quantity and variety to be purchased can be estimated.
(5) For places with large combustible gas leakage, a detection point shall be set every 10-20m apart according to relevant regulations. For unattended small pump house with discontinuous operation, attention should be paid to the possibility of combustible gas leakage. Generally, a detector should be installed at the lower air outlet.
(6) For places with hydrogen leakage, the detector shall be installed on the plane above the leakage point.
(7) For medium with gas density greater than air, the detector should be installed on the lower plane below the leakage point, and pay attention to the characteristics of the surrounding environment. Special attention shall be paid to the setting of safety monitoring points in places where combustible gas is easy to accumulate.
(8) For open combustible gas diffusion and escape environment, if there is no good ventilation conditions, it is easy to make the combustible gas content in the air of a certain part close to or reach the lower explosive limit concentration, which are safety monitoring points that cannot be ignored.
According to the analysis results of on-site accidents, more than half of them are caused by incorrect installation and calibration. Therefore, it is necessary to introduce
