Pfeiffer Vacuum A Passion for Perfection

2.6.4.3 Explosion-protected pumps

The ADx and ADEx series are available for processes in potentially explosive environments, or for evacuating explosive gases..

PTFE-sealed ADx series pumps with pumping speeds from 500 to 4,000 m3/h are made of nodular graphite cast iron 40.3 and are supplied either with or without ATEX motor. Although they are not suitable for pumping explosive gases, they can be operated in potentially explosive environments. They satisfy the explosion protection requirements specified in Directive 94/9/EG (–(i)/ II 3G II BT3 (o)).

ADEx series pumps are identical to the ADx series pumps. They are equipped with an ATEx coupling, an integrated ATEx temperature sensor and can be supplied either with or without ATEx motor (EEx de IIC T4). From 800 mbar onward, they can be switched on without bypass line, which eliminates valves. They satisfy the explosion protection requirements specified in Directive 94/9/EG (II 2G IIB T3 (i) (o)).

Generally speaking, additional measures and / or components are required for safe pump operation, such as start-up and shut-down procedures, special backing pumps, flashback arrestors and pressure sensors. The entire plant must naturally be designed and operated in accordance with the respective explosion-protection regulations. Both series of pumps are available in pumping speeds that range from 500 to 4,000 m3/h.

Gas-cooled Roots pumps

Upon request, the gas-cooled Roots pumps described in Section 2.6.1 can also be supplied in sizes ranging from 500 m3/h (18.5 kW drive power) to 12,000 m3 (200 kW drive power).

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