What specialties are needed for a project from its inception to completion?

All these specialties you mentioned are needed; the workload varies, and there are different stages in the work.

I know all these are needed; I mean, I want to cover it more comprehensively. Please help to add more

It’s clearer to sort it out by oneself. You can organize it from the perspectives of project phases, stakeholders at each phase, the scope of work for each stakeholder, and the positions required to complete the work. For example: Project phases--initiation, design, procurement, construction, commissioning....

I’m a newcomer and not very familiar with this. I need to ask because of work requirements; please give me some guidance

For example: process engineering, electrical systems, instrumentation, equipment, installation, civil engineering, non-destructive testing, planning, cost control, inventory management, procurement, information management, legal affairs, communications, safety, environmental protection, fire protection, cost estimation. In the order suggested by the original poster, the structure can be simplified when the project is small: 1. Engineering department: process engineering (also covering environmental protection), electrical systems, instrumentation, equipment (moving and stationary equipment), civil engineering, corrosion prevention, insulation, safety, communications (many functions overlap with electrical systems), water management (also related to fire protection), planning, cost control, material control, contract management, documentation. 2. Procurement department: procurement engineers for various specialties, inventory management, contract management. 3. Investment department: cost estimation, contract management

Civil engineering and (corrosion protection. Thermal insulation); electrical, instrumentation, and equipment duties (planning, cost control, material control, budgeting, contract management, warehouse management, non-destructive testing, documentation). Telecommunications classified under instrumentation); processes combined with (information management, environmental protection, fire protection)

(Process engineering, electrical engineering, instrumentation, equipment, installation, civil engineering, non-destructive testing, planning, cost control, warehouse management, procurement, information management, legal affairs, communications, safety, environmental protection, fire protection, cost estimation, surveying and mapping, human resources, archives, finance, supervision, project management, water supply and drainage, bidding, business negotiations, quality management, site management, public relations, thermal engineering, materials science, land resource management, geotechnical engineering, surveying, software, thermal energy engineering, refrigeration and cryogenics, industrial analysis, automatic control, environment, chemical engineering, industrial chemistry, electronic information engineering, process equipment and control engineering, industrial engineering) Are there any specialties among these that are not needed or that are repetitive? Also, are there any items missing?