Format, Content, and Other Guidelines for Developing a Materials Selection Diagram - Item No. 21123

Abstract

An MSD summarizes material requirements for process equipment and piping in the refining, chemical processing, power, and other industries, and provides information needed for the development of piping and instrumentation diagrams (P&IDs), piping material specifications, and equipment mechanical data sheets.

In its simplest form, a typical MSD consists of a marked-up or overlaid version of a simplified process flow diagram (PFD) that shows relevant operating conditions and process data, materials selection information, and application(s) of other material degradation preventive measures.

The scope of this standard is to provide format, content, and other guidelines for developing a MSD.

The minimum and optional information to be included on the MSD are defined.

Each user of this document can decide if and when the optional information shall be shown.

Guidance is also provided on key issues that arise when materials are selected.

This standard does not define how to evaluate specific corrosion and materials degradation mechanisms or how to select materials for specific processes.

Sample MSDs are included in Appendix A (nonmandatory) of this standard to show format and content examples