PSIA 4 : Points per square inch absolute is gage pressure plus the base standard atmospheric pressure at a particular location. (Example: 300 pig + 14.65 psia base = 314.65 psia). (WT)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}