Piping Specification and Piping Class

You said:
We have four different Line CLASS....
So i think we should make separate Piping Specifications for each CLASS...I’m i right...???

No!
I would treat each "Line Class" as a "chapter" in a book. The book is a single document called "Piping Material Line Class Specification"

This document then would have a cover sheet which would include the following:
- Document Title
- Document Control Number
- Statement of Purpose and or Function
- List of Contents (each of the individual Line Class sheets, the General Notes, the vent, drain, and other misc. connection details)
- Name of Originator (Responsible person), Date created
- Name and date of checker
- Table of Approval for Issue, (Piping Department, Project, Client)
- Table of Issue History listing Revision, date, what was revised, by who, approval sign-off

All of this would then be issued as a single document.

abba,
You may be right but it has been more than three years since his questions and my answers so I would assume that the question has been resolved.

Thanks for your input anyway.