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Stuffing box calculation for multistage pumps

Stuffing box calculation for multistage pumps

thread819-59312: stuffing box pressure calcs

My query is regarding stuffing box pressure for multistage centrifugal pump for following cases:

case a) BB2 (double suction pump) - Pressurized dual seal - Seal plan : 11-53B-61
case b) BB5 pump with balancing line - Pressurized dual seal - Seal plan : 11-53B-61

For above cases,
1) what will be the stuffing box pressure on DE/NDE mechanical seals?
2) Will Stuffing box pressure be equal to suction pressure or it will be more than suction pressure as plan 11 is provided for inboard seal ?


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