Instrument design for chemical processing units and instrument design for refining units

The differences between the instrument design for refining units and that for chemical processing units lie mainly in the following aspects: 1. Different process flows: Refining units use crude oil as the main raw material to produce finished products such as gasoline, diesel, and lubricants. Chemical plants, on the other hand, use various chemicals as primary raw materials to produce different chemical products such as polymers, adhesives, pigments, plastics, and so on. The production processes and reaction mechanisms of these two types of devices differ, which results in different instrument designs as well. 2. Different processing capacities: Refining units generally process large amounts of crude oil, with a large scale of production ； Chemical processing units are mostly small to medium-sized, with a lower processing capacity, but they handle a wider variety of substances; therefore, the instrument design for such units requires greater attention to detail and accuracy. 3. Different safety requirements: The production process in refining facilities involves risks such as explosions and fires, so the design of instruments in these facilities must place greater emphasis on safety. Chemical processing units, on the other hand, may involve hazards such as corrosion and toxicity, requiring more stringent material selection and design for the instruments used. 4. Different control requirements: During the production process in refining units, the control requirements for parameters such as temperature and pressure are relatively simple, whereas in chemical processing units, more precise control over parameters like temperature, pressure, flow rate, and concentration is necessary. In summary, although the instrument design for both requires consideration of production efficiency, accuracy, and reliability, their focus areas and requirements differ due to differences in production processes and material properties. -

I think this topic is quite complex. Whether in the chemical or petrochemical industries, instruments are generally applicable across sectors. If we must make comparisons, they can be done from the following perspectives: (1) based on the characteristics of the process, scale, maintenance requirements, and cost considerations, such as the selection of flowmeter types; (2) by comparing the standard specifications for HGT and SHT, such as the choice between soft and hard seals for valves