Category D Fluid Service for the process piping design is the less hazardous service that is not flammable and not toxic or otherwise harmful to human tissues. The Category D Fluid Service is less stringent design, examination, and testing are permitted for fluid service of lower hazard with which design pressure is below 150 psi (1,035 kPa), and design temperature is between -29°C to 186°C. An example of Category D fluid is utility water in a plant or low pressure steam condensate. (Refer to the Fluid Service (ASME B31.3))

Related Definitions in the Project: The Piping and Pipeline Engineering