Q. i need a sample p&id about cooling water at a process system

I actually found some good industry and government results by Googling cooling water p&id. Be sure to look at the first few pages. There were some good resources from University of Michigan. I linked one at the bottom.

Go to the databases by A to Z linked below.  The databases are in alphabetical order, so click on 'e' to search EBSCO, 'g' to search Gale and 'p' to search Proquest.

I found some articles and eBooks that might be of use to you. That search is also linked below. Let us know if this isn't sufficient.