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API Plan 03

Open-ended or tapered seal chamber.

API Plan 03

Description

Seal flush Plan 03 is used in applications where collection of solids within the seal chamber is anticipated. Commonly referred to as a “taper bored” seal chamber, the seal chamber shape creates a velocity profile that expels solids and circulates cool fluid to the seal.

Application Notes

  • Circulation between the pump and seal chamber is driven by the geometry or flow enhancement features in the seal chamber.
  • Used in applications where solids would collect in a traditional cylindrical seal chamber.
  • Flush port is plugged.
  • Provides cooling for the seal without use of any external hardware or piping.
  • Vents air or vapors from the seal chamber in horizontal pumps.
  • No throat bushing.
  • Control of the seal chamber environment is limited.
  • The seal chamber is not self-venting in vertical applications.
  • May not be recommended in applications with high seal chamber pressures and/or temperatures.

Pros:

  • Maintenance of cool seal environment without the need for external piping
  • Works well with horizontal pumps
  • Zero throat bushing

Cons:

  • Limited control over the seal chamber environment
  • Might be unsuitable for high pressure applications

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