Conducted by the design/operations team, line-by-line review is the stepwise review of related groupings of design elements. Groupings may comprise an individual piece of equipment…

This technique involves the comparative analysis of all occurrences of a single design element on all P&IDs. These elements are easily located even on complex…

The following information is usually not shown on P&IDs: • Pipefitting details are not shown, except for reducers. These details include hydrotest high- and low-point…

A variety of components, details, and descriptions are shown on typical P&IDs, including the following: • P&ID revisions. Changes should be clearly identified by sequentially…

Lines generally require four to seven identifying elements. Symbology depends on the facility and organization involved. These elements are as follows: • Plant number •…

For additions, the existing instrument numbering system is usually extended to include new instruments. For new construction, the following methods are available: • Functional orientation.…

Assignment of instrument numbers must be coordinated with all design agencies that are developing P&IDs or subsections of P&IDs. A unique identification for each instrument…

Where plant numbers are used, they should be incorporated into equipment numbers, and, often, into the instrument numbers. Where plant numbers are not used (such…

Major facilities (both upstream and downstream) are generally named for their location. Small facilities such as small producing gas plants and small stand-alone asphalt plants…

There are so many systems in use throughout the Company that it would serve little purpose to discuss more than a few general principles here.…