What should be noted in case of leaks at hydrogen-rich areas

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What should be noted in case of leaks at hydrogen-rich areas? ①Quickly identify the location of the leak. Generally, in the case of leaks in high-pressure and high-temperature equipment, it is usually a leak of a mixture of high-temperature hydrogen and hydrocarbons, which can also cause ignition. Immediate notification should be given to higher-level management and the fire department, and the emergency pressure relief system (with a rate of 0.7 MPa/min or 2.1 MPa/min) should be activated right away to reduce pressure rapidly and thus minimize the amount of hydrogen leaking out. Simultaneously reduce the temperature and cut off the feed oil and fresh hydrogen from entering the system. ②While carrying out emergency pressure relief, if a leak of hydrogen at low temperatures has not caused a fire, appropriate protective measures should be taken on site to prevent the accumulation of hydrogen in certain areas; for example, steam can be used to disperse the hydrogen and prevent further fires from occurring. ③The consequences of numerous fires caused by high-temperature hydrogen leaks are extremely severe, and it is difficult to predict their development. If the fire continues to spread and an explosion may occur, evacuation procedures must be carried out. ④After emergency pressure relief, the device is shut down urgently. Note: Fire extinguishing agents with cooling effects such as carbon dioxide and high-pressure water must not be used to extinguish fires resulting from leaks in high-temperature, high-pressure hydrogen-related equipment and pipelines. This is because some sealing surfaces in areas exposed to high temperatures may experience greater leakage due to the different rates of contraction associated with various materials when there is a rapid cooling, which can exacerbate the fire situation and even lead to catastrophic consequences. High-pressure water is used in fire fighting solely to protect other cold equipment, in order to reduce the impact of the thermal radiation generated by the fire on them.