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Pipes and accessories
Various pipelines in chemical plants are commonly referred to as chemical pipelines. Regardless of the quantity, size and type, the general pipeline is composed of pipes, pipe fittings, valves, supports and hangers, instrument devices and other accessories. Its function is to connect the relevant chemical machinery and equipment as well as instruments and devices according to the requirements of the production process to transport various media. There are many types of chemical pipelines, and their construction investment often accounts for more than 30% of the total construction investment of chemical plants. However, there is no unified classification method, and it is customary to classify them according to the following methods.
1. According to the function of pipeline in production
(1) Material pipeline Pipes used to transport raw materials, semi-finished products, finished products or waste materials. This is the main pipeline in production.
(2) Auxiliary pipelines are pipelines used to transport auxiliary media. Such as the steam pipeline for heating, the cold water pipeline for cooling, the clean water pipeline for cleaning materials and the compressed air pipeline for blowing off, etc.
2. According to the design pressure P (MPa) of the pipeline
(1) Vacuum pipeline generally refers to the pipeline with P＜0;
(2) Low-pressure pipeline generally refers to the pipeline with 0≤P≤1.6;
(3) Medium-pressure pipelines generally refer to pipelines with 1.6 ＜P≤10;
(4) High-pressure pipeline generally refers to the pipeline with 10＜P≤100;
(5) Ultra-high pressure pipelines generally refer to pipelines with P>100.
3. Classification according to the working temperature of the pipeline
(1) Low-temperature pipelines generally refer to pipelines whose operating temperature is lower than -20°C;
(2) Normal temperature pipeline generally refers to the pipeline whose working temperature is -20-200℃;
(3) High-temperature pipelines generally refer to pipelines whose operating temperature is higher than 200°C.
4. Classified by pipe material
(1) Metal pipes There are many types of metal pipes, mainly carbon steel pipes, cast iron pipes, stainless steel pipes and non-ferrous metal pipes;
(2) Non-metallic pipes Commonly used non-metallic pipes include plastic pipes, ceramic pipes, glass pipes, graphite pipes, etc.;
(3) Lining pipes Commonly used lining pipes include rubber-lined pipes, lead-lined pipes and glass-lined pipes.