Fluid Service (ASME B31.3) defines four fluid service Categories that is considered the application in process piping system design with the fluid properties, pressure, temperature, and service condition: lower hazard (Category D), more hazardous fluid service (Category M), pressure rating more than 2500# (High Pressure Fluid Service or Category K), and normal fluid services that does not come under above 3 (Normal Fluid Service or Category N). It is the owner's responsibility to select the fluid service category.
Related Definitions in the Project: The Piping and Pipeline Engineering
ASME B31.3
