Цитата: Фёдор144 от 20.06.2020 21:16:17сжиженный хранят в чуток других устройствах ...
Hydrogen has a normal boiling point of -252.5C and is therefore a gas. Hydrogen has a wide flammable range of 4 - 75%, a low minimum ignition e nergy of about 0.019 mJ and a high burning velocity. It is therefore easily ignited and burns rapidly. For occupational exposure hydrogen is classed as an asphyxiant.
In consequence of its flammability, hydrogen presents an explosion hazard and it is necessary to take suitable precautions. As far as the hazard of an open air explosion is concerned, hydrogen gas has a low density and tends to rise and dissipate rapidly unless it is very cold. Nevertheless, vapor cloud explosions of hydrogen have occurred. They are discussed in more detail in Chapter 17
Hydrogen gas may burn in air, but hydrogen flames have low heat radiation, about one-tenth that of propane, and tend, therefore, to be less hazardous. The gap through which a hydrogen flame can travel is much smaller than with most other gases. It is therefore more difficult to make electric motors sufficiently flameproof for operation in atmospheres which may contain a flammable hydrogenair mixture.
Hydrogen at elevated pressures and temperatures attacks mild steel severely, causing hydrogen decarburization and embrittlement, and it is necessary, therefore, to use special alloy steels in hydrogen service
Leakage of hydrogen constitutes a problem. The pressures in plant handling hydrogen are commonly high and the gas diffuses readily through small holes. Hydrogen exhibits a reverse JouleThomson effect, so that leaking gas heats up and may ignite. Since the flame is nonluminous, it may not be visible. An operator may walk unawares into a hydrogen leak flame.
Hydrogen can also diffuse through solid metal. It can pass, for example, into a thermocouple pocket and thence through the connecting leads into the control room. Where this risk exists, therefore, it is good practice to arrange the connections so that there is no flow path for the hydrogen.
Lees Loss Prevention in the Process Industries (C)