The pressure rating that continuous operations may take place at the set conditions and fluids. Examples e.g., WP set at 80% of rated burst for new pipe, 70% for used pipe, 50% for welded or damaged pipe
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}