Piping also comes in different schedules (or wall thicknesses). SA 53 B is the designation for plain black-steel pipe mostly used in industry. An example is ASTM (American Society for Testing and Materials) A 53B, ASME (American Society of Mechanical Engineers) SA 53 B. In many cases, the mill rolls the sheet into tubes and welds it. Most pipe is manufactured at a steel mill from sheet steel. It is important to understand piping system design and the consequences of being wrong. Methods below provide insights for understanding and conducting a simple screening of a steam piping system. These methods identify safety issues related to design and/or installation of pipe, valves, flanges, and components used in these piping systems. To ensure that an accident is not waiting to happen the next time someone opens a valve or puts a steam line into service, there are nine methods for screening high-pressure (below 300 psig) piping systems typically encountered in industrial steam plants.