What exactly are the utility systems and auxiliary facilities in the chemical industry?

Public utilities are terms for process operations and equipment as defined by the National Science and Technology Terminology Review Committee in 2019; specifically, they refer to the auxiliary facilities needed to maintain the proper operation of chemical processing units. It mainly includes water supply and drainage, gas (steam) supply, power supply, heating, cooling, etc

Utility and auxiliary works are supporting projects that serve the proper operation of the main project components. Utility systems mainly include water supply, drainage, power supply, communication, heating, ventilation, and other related systems; auxiliary systems encompass maintenance, testing, inspection, storage, and other related activities. During the feasibility study phase, utility and auxiliary systems should be studied simultaneously with the main project. Public use...? Practical Handbook for Feasibility Studies of Engineering Construction Projects

General engineering mainly includes the main structure, auxiliary works, utility systems, storage and transportation facilities, environmental protection measures, administrative and living facilities, supporting projects, associated works, temporary structures, and so on. The six categories, from the main construction works to the administrative and living facilities, are relatively fixed. As for the supporting and associated projects, they may overlap with the previous ones, while the temporary projects are likely related to the construction process itself. Specific references for each project: (1) General main project: production line (essential for product manufacturing) ； (2) Auxiliary facilities: air compression stations, refrigeration stations, heat transfer oil systems, flares, catalyst regeneration and manufacturing units, storage areas, tank farms, machine repair facilities, laboratory analysis units, control rooms, etc., provided to support the production process (established for intermediate stages of production) ； (3) Utility systems: water intake stations, water treatment facilities, circulating water systems, power distribution and transformation systems, boiler rooms, etc., provided to support the entire plant ； (4) Main storage and transportation facilities: including storage tanks, warehouses, railway loading/unloading platforms, and truck garages, etc ； (5) Administrative and living facilities: including office buildings on site, canteens, bathrooms, shift change rooms, etc ； (6) Environmental protection projects: including supporting environmental protection facilities such as dust removal devices, sewage treatment stations, and temporary storage areas for hazardous waste ；