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Today, modular design for equipment is increasingly being used in industries such as oil, petrochemicals, natural gas, healthcare, coal, and water treatment. PFD and PID design are carried out according to the functions requested by the user; equipment selection as well as the selection of piping and instrumentation are done based on the process conditions. The system is manufactured and installed in accordance with specific manufacturing processes, and it enables both local and remote control. Thereby reducing labor and financial costs as well as energy consumption. It features a small footprint and convenient centralized operation and maintenance. Classified by function, such as: voltage regulation system, metering system, analysis system (cab), mixing system, oil unloading device, etc. Classified by medium, such as CNG boosting skids, LNG vaporization stations, crude oil metering systems, drag-reduction agent injection systems, etc. Engaging in modular design requires certain licensing conditions. Taking the pressure pipeline component assembly device as an example, first of all, manufacturers who produce skid-mounted equipment need to have the necessary manufacturing license. Determine the types and categories of products in accordance with the Catalogue of Licenses for Special Equipment Manufacturing Units. Then submit the application online (prior to submission, ensure that the required resource conditions, quality assurance system, and technical capabilities are in place according to the category of the application) ； Any missing items must be corrected). Application procedure: Online application – Acceptance – Evaluation and assessment – Review and issuance of certificate. Other licenses should be handled in accordance with the corresponding rules.