(b) when the maximum pressure is 40 kPa or more, the pressure shall be reduced in 3 stages as follows:i. the first stage shall be a reduction from maximum pressure to one-half maximum pressure, at a rate not exceeding 35 kPa per minute;
ii. the second stage shall be a reduction from one-half maximum pressure to 1/4 maximum pressure, at a rate not exceeding 14 kPa per minute; and
iii. the third stage shall be a reduction from 1/4 maximum pressure to atmospheric pressure, at a rate not exceeding:(A) 3.5 kPa per minute when the maximum pressure is not over 140 kPa; or
(B) 1.7 kPa per minute when the maximum pressure is over 140 kPa but not more than 350 kPa.