We all know that liquid ammonia is a kind of high-risk substance. Liquid ammonia is not only an inflammable and explosive material, but also liquid ammonia vapor, ie, ammonia, is a highly toxic gas. Mild inhalation of ammonia poisoning shows rhinitis, pharyngitis, Tracheitis, bronchitis. Severe inhalation poisoning may cause laryngeal edema, glottis stenosis, and loss of respiratory mucosa, which may cause obstruction of the trachea and cause suffocation. Inhalation of high concentrations can directly affect the pulmonary capillary permeability caused by pulmonary edema, and even cause poisoning! On June 3 this year, a leakage of liquid ammonia in Ammonia Storage Tanks in Jilin province caused an explosion, resulting in 120 deaths and 70 injuries. In the face of these bloody accidents, the company's security work needs to be taken more seriously and do a variety of security work. The Jinan Weinuo Ammonia Gas Alarm Factory reminds you to install the ammonia gas alarm is a necessary guarantee for the company's safe production!
Application considerations
Ammonia gas alarm fixed installation once in place, its location is not easy to change, specific applications should consider the following points.
(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) Determine the direction of leakage of toxic gas when there is a large amount of leakage, based on specific factors such as the airflow direction and direction of the location.
(3) According to the density of leaked gas (greater than or smaller 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 sites where there is a large leakage of toxic gases, a test point should be set at a distance of 10-20 m per relevant regulations. For unattended, small, non-continuous pumping stations, attention should be paid to the possibility of toxic gas leakage, and a detector should generally be installed at the downtake.
(6) For locations with hydrogen leaks, the detector should be installed on the Ammonia Storage Tanks 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. For sites where toxic gases can easily accumulate, special attention should be paid to the setting of safety monitoring points.
(8) For open toxic gas diffusion and escape environments, if there is a lack of good ventilation conditions, it is easy to make the toxic gas content in the air close to or reach the lower explosion concentration in a certain area. These are all non-negligible safety monitoring points. . According to the results of Ammonia Storage Tanks field accident analysis, more than half of them were caused by incorrect installation and calibration. Therefore, it is necessary to introduce the correct installation and calibration precautions to reduce the failure.
