Anehydrous chlorine storage tanks are not at room temperature? Why are liquid chlorine pipelines insulated with insulation material rather than kept warm?

Insulation and heat retention are two different things. On the condition of meeting heat transfer requirements, insulation can replace thermal insulation, but thermal insulation cannot replace insulation. The pipes are hot; provide insulation to prevent rapid heat loss and avoid burning others ； Insulation: Water vapor that evaporates in the air collects and turns into water droplets, causing localized rusting.

In other words, liquid chlorine pipelines do not require insulation; there is no loss of cooling capacity, and insulation is only used to prevent moisture from entering? ? ?

Thank you. Does endothermic vaporization cause dew point corrosion? ? ?

……That’s indeed the case; we use liquid chlorine. In fact, liquid chlorine vaporizes easily and absorbs heat, which leads to lower temperatures in the areas where the pipes are exposed. Water vapor then condenses on these pipes, and over time corrosion occurs :)

That means special attention must be paid to the anti-corrosion treatment of liquid chlorine pipelines, as dew point corrosion is quite severe in such environments

It is necessary to keep the temperature inside the pipes from rising; some substances, such as concentrated sulfuric acid, hardly react with iron at room temperature and can be stored in carbon steel tanks. However, when heated, it does react with iron, and there have been incidents of accidents occurring due to welding on pipes carrying concentrated sulfuric acid. It is the temperature changes that trigger chemical reactions. By the same logic, the cooling effect of liquid chlorine can be attributed to the following factors: 1. An increase in temperature leads to increased corrosion ； 2. As the temperature rises, liquid chlorine vaporizes; its volume increases by hundreds of times after vaporization, which in turn causes a sharp rise in pipeline pressure ； 3. Prevent trace leaks of chlorine from reacting with condensed water to form hydrochloric acid and hypochlorous acid, which can corrode the outer wall of the pipes ； 4. Generally, materials used for insulation or heat retention can absorb some of the impact, which can thus serve to protect the pipes as well (a very minor role)