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Operation
A705-40-880 Issue B
4 Operation
4.1 Operational safety
During operation, parts of the pump can become very hot. Ensure that you do not touch the pump.
The pump is suitable for handling flammable vapours from Gas Group IIA, IIB and IIC within temperature
classifications T1, T2, T3 and T4. Please ensure that suitable flame arresters for the gas group required are
fitted when using containment as the protection principle under ATEX. For handling flammable vapours it is
necessary to fit additional protective equipment in accordance with the flammable zone that is present
inside the pump: for pumps which are part of an ATEX system, refer to the ATEX System instruction manual.
Do not operate the pump with a coupling cover guard removed. If you do, there will be a danger of injury or
death from the rotating mechanisms.
Do not operate the pump with the pump-inlet or -outlet open to atmosphere. If you do, there will be a
danger of injury or death from the rotating mechanisms, from the exposure to vacuum, or from hot exhaust
gases.
On a pump with a torque limiter, do not let the pump-motor operate for more than 8 hours if the torque
limiter has tripped and decoupled the pump-motor from the pump. If you do, the torque limiter may get very
hot and there may be a risk of fire or explosion.
You must ensure that the gas supply cannot be interrupted during pump operation. Refer to the ATEX manual
(P600-60-200) for further details.
If the pump is part of an ATEX system, a pump case temperature limit will have been specified for normal
pump operation (refer to the ATEX System instruction manual for details). You must ensure that the pump
case temperature is maintained below this limit, otherwise the pump will switched off by the ATEX control
system.
Note: The procedures in the following Sections assume that you have a pump-inlet isolation-valve fitted to your
pump.
4.2 ATEX system control
If your pump is part of an ATEX system, use the predefined procedures to:
Start up the system.
Allow the pump to warm up.
Shut down the system.
Refer to the ATEX System instruction manual for details.
Obey the safety instructions given below. If you do not, the installation may not be safe, and there
may be a risk of injury or death to people.
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