Full Description

This Practice provides requirements for designers preparing Piping and Instrumentation Diagrams (PIDs). This Practice describes the requirements for PID format and content. The Practice is independent of time in a facility life cycle and encompasses design, construction, operations, and maintenance. This Practice covers the generation of new PIDs and does not apply to the revision of existing PIDs. This Practice also applies to PIDs provided by packaged equipment vendors. This Practice applies to all diagrams that fit the definition of a PID in Section 3. The requirements provided in this Practice can be applied to any CAD system used for developing the PIDs and are not vendor, hardware, or software specific. This practice uses U.S. Customary units of measure for drafting dimensions. Line weights are also given in metric units. Current PIP experience is that symbol sizes and drafting dimensions are often based on U.S. Customary units even if the project design and labeling is in metric units. All drafting dimensions could be stated in metric units at the discretion of the user. The requirements provided in this Practice provide a balance between showing all data on PIDs and making PIDs legible and easy to read. Process specific overlays may be developed to define necessary additional requirements or exceptions. The example PIDs included in the Appendixes of this Practice are not intended to recommend specific design details or requirements. Example PIDs are included to provide an illustration of how the elements of this Practice are combined into a PID. Electronic native files for the text, symbols, and legend sheets are available to PIP Member Companies for input to members’ CAD systems. Development of project-specific legend sheets is recommended using the PIP native files as a starting point. Additions and/or deletions are allowed to meet requirements. Legend sheet borders and title blocks can be altered. Development of PIDs has historically been led by the petrochemical, oil gas, and specialty chemical industries. While applicable to all industries, guidelines and practices have primarily focused on these industries. In this revision, we have expanded the scope to include information specific to developing PIDs for the hygienic processing industries – pharmaceutical, food, and beverage. While Sections 2, 3 and 4 contain requirements for PIDs across all industries, Appendix D contains content specific to the hygienic processing industry that supplements or replaces that in Sections 2, 3 and 4. If PIP membership grows to include other industries, it is anticipated that this Practice will expand to have sections on developing PIDs for the mining, power, pulp and paper, and other industries.