Products

API Plan 31

API Plan 31

Recirculation from the pump discharge through a cyclone separator delivering the clean fluid to the seal chamber. The solids are delivered to the pump suction line.

A  Cyclone separator
B  Contaminated liquid IN
C  Clean liquid OUT
D  Separated liquid OUT


Seal chamber details

1  From clean discharge connection of cyclone separator
2  Flush (F)
3  Quench (Q)
4  Drain (D)
5  Seal chamber


Example seal: EagleBurgmann SH single pusher mechanical seal.


P&ID according to API

Features

  • Plan 31 is a variant of Plan 11 (Plan 11 + cyclone separator).
  • The cyclone separator removes solids and prevents all but a few minor particles from reaching the seal chamber.
  • The media properties retained as solids are routed back to pump suction.

Application

  • Horizontal pumps conveying media like water with sand particles.
  • Horizontal pumps conveying media with heavy suspended solids.

Remarks, checkpoints

  • Specific gravity of the solids should be at least twice that of the pumped media. In other cases Plan 32 is recommended.
  • The installation of the pump throat bushing must be ensured.
  • Do not use for extremely contaminated media. Plan 32 is recommended in such cases.
  • Can lead to reduced reliability due to abrasive wear inside the cyclone.
  • Routine inspection of the cyclone for abrasive wear is recommended.

Pump media characteristics

  • Suspended fluids

Location, function

  • Process side
  • Flushing and cooling

Configurations

1CW-FL, 1CW-FX, 2CW-CW, 2CW-CS, 3CW-FB, 3CW-BB, 3CW-FF
 

3NC-FB*, 3NC-BB*, 3NC-FF*

* Remark: The configurations listed for each individual piping plan are to be understood as recommendations including possible utilizations which may also be applied.

 

API 682 4th Edition

Contact us

Follow the direct link to your API 682 4th ed. contact

Show locations

API piping plan tool

Download the free EagleBurgmann API piping plan tool and benefit from useful and practical information

PDF download - 4.0 MB
Newsletter

Excellence in Practice

With our free e-mail newsletter „Excellence in Practice“, you will receive first-hand information about current products, services, references and worthwhile industry insights.

True