Classification of BOP and well control equipment.
Well control equipment falls into five basic working pressure classifications:·13,800 kPa (2000 psi) WP,·20,700 kPa (3000 psi) WP,·34,500 kPa (5000 psi) WP,·69,000 kPa (10,000 psi) WP,·103,500 kPa (15,000 psi) WP.
The BOP stack rating of used BOP"s (> 5 years old) should be at least 10% higher than the maximum expected surface pressure that could be encountered during drilling and workover operations. The safety margin may become less than 10%, depending on condition and age of the . . .