Excessive leakage Plan 53B

Hi there.
Interested to know how you have come to the conclusion it is not reverse pressure causing premature failure of your API 682 Plan 53B seal system? I’m assuming you are monitoring the pump pressure / chamber pressure and have sufficient margin in the Plan 53B seal system to account for varying load scenarios?

Can you provide some more details on the pump design, seal system and operating conditions, such as mech seal type (dual, face materials, barrier fluid used, etc.), suction/discharge pressures, pump type, stages, balance arrangement and data to prove it is not reverse pressure?

Thanks!