31. A well drilling licensee shall ensure that the blowout prevention system specified in the well drilling program for operations below the surface casing has a rated working pressure that is equal to or greater than the maximum formation pressure specified in the program.
Where the maximum formation pressure cannot be predicted, it is presumed to be equal to or greater than 11 kPa per metre of the depth of the well.
O.C. 1539-88, s. 31; O.C. 1381-2009, s. 19.