BOC Edwards A343-10-940, Инструкция по эксплуатации

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E1M18 and E2M18 Rotary Vacuum Pumps
OPERATION
PAGE
23
Sep 06 23 Sep 06
4 OPERATION
4.1 ATEX directive implications
4.1.1 Introduction
This equipment is designed to meet the requirements of Group II Category 3 equipment in accordance
with Directive 94/9/EC of the European Parliament and the Council of 23rd March 1994 on the
approximation of the laws of the Member States concerning equipment and protective systems intended
for use in potentially explosive atmospheres. (The ATEX Directive)
The ATEX Category 3 applies in respect of potential ignition sources internal to the equipment. An
ATEX Category has not been assigned in respect of potential ignition sources on the outside of the
equipment as the equipment has not been designed for use where there is an external potentially
explosive atmosphere.
There is no potential source of ignition within the pump during normal operation but there may be
potential sources of ignition under conditions of predictable and rare malfunction as defined in the
Directive. Accordingly, although the pump is designed to pump flammable materials and mixtures,
operating procedures should ensure that under all normal and reasonably predictable conditions, these
materials and mixtures are not within explosive limits. Category 3 is considered appropriate for the
avoidance of ignition in the case of a rare malfunction which allows flammable materials or mixtures to
pass through the pump whilst within their explosive limits.
4.1.2 Flammable/pyrophoric materials
When flammable or pyrophoric materials are present within the equipment you must:
• Not allow air to enter the equipment.
• Ensure that the system is leak tight.
• Use an inert gas purge (for example, a nitrogen purge) to dilute any flammable gases or vapours
entering the pump inlet, and/or use an inert gas purge to reduce the concentration of flammable
gases or vapours in the pump and in the exhaust pipeline to less than one quarter of the gases'
published lower explosive limits (LEL).
• Use an inert gas purge into the pump gas ballast connection to prevent the condensation of
flammable vapours within the pump mechanism and exhaust pipeline.
WARNING
Do not expose any part of your body to vacuum. If you do, you may be injured.
WARNING
You must obey the instructions and take note of the precautions given below, to ensure
that pumped gases do not enter their flammable ranges.