Gaseous O2 is formed by the vaporization of liquid oxygen. The chemical symbol of liquid oxygen is O2, light blue, and its boiling point is-183℃. When cooled to -2 18.8℃, it becomes a light blue solid with snowflake shape, and the density (boiling point) of liquid oxygen is 1. 14g/cm3. Another interesting feature of liquid oxygen is that it can be attracted by magnets. The main physical properties of liquid oxygen are as follows: the density is1.14/t/m3 (114/kg/m3), and the freezing point is 50.5k (1m3) at normal pressure.
Second, how to deal with the leakage of industrial gas liquid oxygen
1, judge the degree of leakage.
According to the degree of industrial gas leakage, corresponding measures should be taken to avoid making a mountain out of a molehill or missing a good remedy opportunity. First, let's judge the degree of liquid oxygen leakage. If it is a slight leak, you can find a professional to remedy it in time, and then observe the use of the liquid oxygen tank. If it is a serious leak, emergency measures should be taken immediately to remedy it on the premise of ensuring the safety of personnel.
2, cut off the source of leakage
Cutting off the leakage source of liquid oxygen requires professional operation. During the operation, operators should take protective measures and carry protective articles. Emergency responders are advised to wear self-contained breathing apparatus and general work clothes. Avoid contact with flammable or combustible materials. Cut off the leakage source as much as possible.
Step 3 evacuate the crowd
Quickly evacuate the personnel in the contaminated area caused by liquid oxygen leakage to the upwind area, isolate them and strictly restrict access. Cut off the fire. Cut off the leakage source as much as possible. Reasonable ventilation and accelerated diffusion. When liquid oxygen leaks, you must wear protective equipment to enter the site to eliminate fire hazards and ensure site ventilation. Stay away from flammable materials and let the leaked oxygen volatilize by itself.
4. Good ventilation
Cut off gas supply, exhaust (indoor) or strong ventilation (outdoor). If possible, use an exhaust fan to send the leaked gas to an open place. When liquid oxygen leaks, try to close the leakage source, volatilize by itself, and do a good job of site ventilation. Liquid oxygen itself is a nonflammable substance, but it is very active and has strong combustion-supporting performance, especially in confined spaces. Therefore, it is necessary to ventilate the surrounding environment when the liquid oxygen leaks, and the danger will be relieved after the liquid oxygen dissipates.
5, the scene of the processing
The field treatment of liquid oxygen leakage after liquid oxygen leakage should not be taken lightly at this time. If professionals wear protective clothing and bring protective equipment into the industrial gas leakage site, we need to pay attention to evacuate the residual liquid oxygen in the corner of the leakage site. Other personnel can not enter the site until the staff is sure it is safe.