Although there are many things that do not need to
be indicated on a P&ID, there are still benefits to having
P&IDs that, like a 3-D model, are specification-driven. With
specification-driven P&IDs, users can set pipe sizes and
specifications, and place items into process lines with the
knowledge that these inserted items are correct. With this
capability, they know that they are receiving the same benefits as their downstream colleagues and delivering more-
accurate lists and reports much earlier in the engineering and
design process.