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Pumps for ATEX zones

Pumps pose a potential source of ignition during operation. The essential sources of ignition are hot surfaces, mechani- cally triggered sparks or electrostatic discharge. SAWA pumps of Categories 2 and 3 are designed to guaran- tee a high level of safety if operated within speci cations.
The SAWA ATEX pumps comply with the ATEX Directives and are allowed for zones 1/21 and 2/22. Running dry must be avoided at all costs since, otherwise, inadmissibly high temperatures may occur within a very short time.

The following measures may be taken to prevent inadmissible operating states (e.g. motor over- load or running dry):
  • current-consumption monitoring
  • protection against dry running using Liquiphant
  • temperature monitoring at the containment shell or at the slide bearings (on pumps with magnetic coupling) or at the mechanical seal
  • use of double-acting mechanical seals in tandem or back-to-back arrangement
  • Dpressure monitoring at the pressure dis- charge nozzle
  • flow monitoring

Optional forms

Category 2 – high safety

ATEX Zone 1 and 21
  • bearing housing option with single-acting or double-acting mechanical seal
  • magnetic coupling

Category 3 – normal safety

ATEX Zone 2 and 22
  • bearing housing option with single-acting or double-acting mechanical seal
  • block pump with plug-in shaft with single-acting or double-acting mechanical seal
  • magnetic coupling

The ATEX identi cation of the SAWA pumps is as follows: II 2G cX or II 2G/3D cX

Motors

  • with ameproof enclosure EEx de IIC T4 (e.g. for operation with frequency converter) forzones1and2or
  • EEx e II T3 for zones 1 and 2

Other motor types are also available on request.
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