Core documents
A strong PDP normally includes a basis of design, process description, mass and energy balance, process flow diagrams, P&IDs, equipment list, datasheets, utility requirements, control philosophy, safety basis and open items register.
The design basis is critical
The basis of design defines feed, products, battery limits, operating cases, design margins, site conditions, utility assumptions, safety criteria and applicable standards. Weak design bases create weak projects.
Assumptions must be visible
For new technologies, assumptions are unavoidable. The problem is not having assumptions; the problem is hiding them. A live assumptions and open items register is one of the most important PDP tools.
Commissioning should influence the PDP
If a process cannot be commissioned safely and logically, the design is not ready. Operating modes, startup, shutdown, cleaning, flushing, sampling and testing requirements should be considered early.