Question: what is wpb in pipe fittings?
Answer: ASTM A234 WPB Pipe Fittings means that the pipe fitting with ASTM A234 WPB material and is used for the system of pressure piping of high or moderate temperature services. ASTM A234 is standard of the pipe fitting material. ... WPB is a steel grade in which W stands for weldable, B is grading B and P stands for pressure.