Expansion joints are commonly used in pipelines of major chemical plants in China. When we mention the word "chemical engineering", we first think of the word "corrosion". Because I am a chemical professional, I also have a good understanding of some requirements of chemical plants. Later, when I entered the society, I came into contact with the pipeline expansion joint industry, which has a direct relationship with chemical plants. Sometimes some customers of chemical plants ask questions about expansion joints, I can solve all the problems. Let's cut to the chase. Chemical plants usually transport acid, alkali and corrosion resistant liquids. At this time, expansion joints must be acid and alkali resistant when using expansion joints, otherwise they will be corroded in a short time. In addition, petroleum belongs to the chemical industry, and expansion joints must also be oil resistant. Once leakage occurs, It will cause more losses. Let's take a detailed look at the requirements of the chemical plant for expansion joints. The main material of chemical pipeline is ultra-high molecular weight polyethylene (UHMWPE), which is a thermoplastic engineering plastic with an average molecular weight of more than 2 million, polymerized by ethylene and butadiene monomer under the action of catalyst. Expansion joints in chemical pipelines mainly play a good role in regulating the expansion of long-distance pipelines due to temperature difference. The product can also be axially retracted within a certain range, and can also overcome the offset caused by different axial directions of the pipeline butt joint within a certain angle, which can greatly facilitate the installation and disassembly of the valve pipeline. It can freely retract in the allowable expansion amount of the pipeline. Once it exceeds its maximum expansion amount, it will play a limiting role to ensure the safe operation of the pipeline.
When installing the electric ball valve, the yellow auxiliary positioning components and fasteners used for installation and transportation on the electric ball valve should be removed as soon as possible, and the limit device should be adjusted to the specified position according to the design requirements, so that the pipeline system has sufficient compensation capacity under environmental conditions. Therefore, expansion joints can be widely used in chemical pipelines.