Erw Pipe : Pipe having one longitudinal seam formed by electric-flash welding or electricresistance welding, without the addition of extraneous metal. (RP 5A5)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}