A133-99-880 Issue E
Page 6
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Operation
4
Operation
Take note of the following information:
In common with other types of sorbent, activated alumina absorbs moisture. This will not affect its oil
vapour trapping properties but may tend to prolong rough pumping on successive pumping cycles. Regular
regeneration by baking the trap or renewal of the sorbent will be necessary for rapid pump-down.
If the FL20K has been open to atmosphere for a long period of time, it may be necessary to carry out
prolonged pumping with a gas-ballasted rotary pump to remove the absorbed moisture. Alternatively,
remove the basket from the FL20K and bake it at 250°C to 300°C for two hours.
Use a valved by-pass line to minimise vapour absorption during pump-down.
WARNING
Activated alumina is a desiccant and will absorb materials from your process system. You must take
suitable precautions to protect people from the harmful effects of any noxious materials released
if you bake the spent alumina to reactivate it. Avoid inhalation of its dust, eye contact and
unnecessary skin contact.