Combustible gas alarm is a measuring device for safety protection. It is a safety device for preventing accidents. It is widely used in petroleum, gas, chemical, oil depot and other petrochemical industries that have combustible gases. Combustible gas alarms, as a safety device closely related to people's lives, are increasingly receiving widespread attention and application. What are the precautions in use?
(1) Find out which possible leakage points of the devices to be monitored, analyze their leakage pressure, direction and other factors, and draw the distribution map of the probes, and classify them into three grades I, II and III according to the severity of the leakage.
(2) According to specific factors such as airflow direction and wind direction at the site, determine the direction of leakage of flammable gas when a large amount of leakage occurs.
(3) According to the density of leaked gas (greater than or less than air), combined with the trend of air flow, integrate the three-dimensional flow chart of leakage and make an initial set-point scheme at the downstream position of the flow.
(4) The leakage status of the leaking point was studied as microleakage or jetting. If it is a microleakage, set the position of the point to be near the leak. If it is a spray-like leak, keep it slightly away from the leak. Combine these conditions and draw up a final plan. In this way, the number and type of purchases needed can be estimated.
(5) For locations where there is a large leakage of flammable gas, a test point should be set at a distance of 10-20 m in accordance with relevant regulations. For unattended, small, non-continuous pumping stations, attention should be given to the possibility of flammable gas leaking. A detector should normally be installed at the downtake.
(6) For locations with hydrogen leaks, the detector should be installed on the plane above the leak.
(7) For media with a gas density greater than air, the detector should be installed on the lower surface below the leak point and pay attention to the surrounding environment. Sites that are liable to accumulate flammable gas should pay special attention to the setting of safety monitoring points.
(8) For an open flammable gas diffusion escape environment, if there is no good ventilation, it is easy to make the flammable gas content in the air close to or reach the lower explosive concentration in a certain part. These are non-negligible safety monitoring points. .
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