API Plan 02

API Plan 02

Dead-ended seal chamber with no recirculation of flushed fluid. Flush connections plugged.

A  Flush connection plugged


Seal chamber details

1  Flush (F), plugged (for possible future circulating fluid or for venting on vertical pumps)
2  Vent (V), if required
3  Heating/cooling inlet (HI or CI), heating/cooling outlet (HO or CO), if required
4  Quench (Q)
5  Drain (D)
6  Seal chamber


Example seal: EagleBurgmann LY9TC single stationary metal bellows mechanical seal.


P&ID according to API

Features

  • Does not need any external piping.
  • Cooling water or low temperature steam can be used in the seal chamber cooling jacket to decrease seal chamber temperature.
  • Used in combination with Plan 62 steam quench for hot process media.

Application

  • Large bore seal chambers, preferably with a cooling jacket.
  • Low speed pumps.
  • Generally popular in chemical industry.

Remarks, checkpoints

  • The vapor pressure margin in the seal chamber must be considered carefully in order to avoid flashing.
  • Provide a 12 o’clock vent when used with horizontal pumps with cylindrical seal chambers.
  • Always use a cooling/heating jacket for cylindrical seal chambers.
  • Regular maintenance and cleaning of the cooling jacket is recommended as they are prone to fouling in high temperature applications and also tend to become ineffective over a period of time due to poor cooling water quality.

Pump media characteristics

  • Clean fluids with low temperatures and higher specific heat.
  • Fluids which have adequate PTM (product temperature margin).

Location, function

  • Process side
  • Lubrication

Configurations

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