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Mechanical Seal Design

Mechanical Seal Design

Mechanical Seal Design

In order to determine the pressure of the barrier fluid of a API 610 plan 53 sealing system, I need to know which is the pressure to be sealed at inboard seal. Is it the pump suction pressure?

RE: Mechanical Seal Design

Here is my suggestion. I use 10 psi above any pressure relief device in the system as the barrier set point. I must encourage you however to check with the pump manufacturer first.


RE: Mechanical Seal Design

1.  610 now refers to 682 version 2

2.  The pressure you need to define is the pressure in the stuffing box/seal chamber.  This process fluid pressure is between the discharge pressure and the suction pressure and depends upon the type of impeller used in the pump.  Many OEMs put the stuffing box pressure on the pump curve, if not check with your pump or seal vendor.  

3.  API plan 53 requires that the barrier fluid used between the inboar and outboard seals to be 25 psi above the stuffing box pressure.  Again, your seal rep is likely very experienced and would be happy to help.

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