What inputs do I need from Engineering to Procurement in an EPC schedule?

Member for

19 years 1 month

Ideally, it should be Approved For Construction or Issued for Construction details, specifications, drawings etc.

However, sometimes (or perhaps most of the time) detailed engineering needs inputs from suppliers or manufacturers themselves who were the only ones that knows the exact specifications of what they were manufacturing especially for special equipment, but then again, it will go through the process until issued and or approved for construction. 

For a Planner or Scheduler, you just ask your Engineering for a list of items/ equipment that need to be procured (i.e. long lead items).