Is there really a nominal pipe pressure?

Pipelines have a nominal pressure: The pressure class of a pipeline. The components that make up pressure pipelines are generally standard components; therefore, the design of these components focuses on selecting appropriate standard parts. Determining the pressure class of a pipeline is equivalent to determining the grade of those standard parts. The pressure rating of pipes consists of two parts: the nominal pressure rating of the standard pipe fittings, which is expressed in terms of nominal pressure ； The wall thickness grade of standard pipe fittings, expressed in terms of wall thickness class. Pressure rating of pipes: Generally, the parameter that reflects a pipe’s pressure-bearing capacity, and which is determined by the nominal pressure rating and wall thickness rating of the standard pipe fittings used in that pipe, is referred to as the pipe’s pressure rating. And *for the sake of simplifying descriptions, it is common to refer to the nominal pressure rating of the fittings in a pipeline as the pipeline’s pressure rating. Determining the pressure class is the foundation of pressure pipeline design and the core of it. It is a design prerequisite for the layout of pressure pipelines and the stress verification of such pipelines, and it is also an important factor affecting the capital investment in pressure pipeline infrastructure as well as the reliability of the pipelines.

Yes, this can be checked in the relevant manuals.