Piping Related Abbreviations (P)

PBE is an abbreviation of Plain Both Ends
Plain Both Ends means that both ends of e.g. a pipe nipple are plain.

PED is an abbreviation of Pressure Equipment Directive

PFD is an abbreviation of Process Flow Diagram

PI is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.

PMI is an abbreviation of Positive Material Identification

PREN is an abbreviation of Pitting Resistance Equivalent Number

PWHT is an abbreviation of Post Weld Heat Treatment