ISA RP75.21 : 1989

1 Scope
2 Purpose
3 Definitions
4 Discussion
5 Process data envelope
6 Process schematic
7 Process piping and configuration
8 Process data worksheet
9 Suggested applications
Annex A - References
Figures
1 - Example of a process data envelope
2 - Example of a process schematic
3 - Examples of process piping configuration sketches
4 - Process data worksheet

Specifies a technique for the communication of process data and other special requirements among the parties involved to facilitate the selection of control valves, their actuators, and accessories.