18. High-Purity Piping

The rules in Chapter X of ASME B31.3 are used when the owner designates a piping system to be in High-Purity Fluid Service. The owner is guided in the classification for the piping system by the definition of High-Purity Fluid Service in Chapter I of ASME B31.3. This definition is the Code rule relative to classification. A guide to the application of these rules is provided in ASME B31.3, Appendix M, which contains a flow chart to assist the owner in classifying fluid services.