Because of the very technical nature of the client's ideas and requirements, it is necessary to proceed in a very structured manner, allowing the client's wishes to be completely incorporated in the final design. The engineering staff and piping staff are responsible, in general, for the design of process or product piping. The plumbing department is intended to design the more mundane piping, such as water, sanitary drainage, storm water drainage, and other "building"
It could start when the client's staff publishes a written advertisement called a "Request for Proposal"