Measures when pumping various chemical substances

3 Measures when pumping various chemical substances 

This discussion cannot provide exhaustive coverage of the many and varied application fields fbr oil-filled vacuum pumps in the chemicals industry. Our many years of experience w/ith the most difficult of chemicals applications can be used to solve your particular problems. Three aspects should, however, be mentioned briefly pumping explosive gas mixes, condensable vapors, and corrosive vapors and gases. 

LEYBOLD pumps offer three options for keeping vapors from condensing in 

Oil-sealed pumps are already quite satisfactorily protected against corrosion due to the oil film which will be present on all the component surfaces. Corrosion is defined here as the electrochemical dissolution of metals, i.e. the release of electrons by the metal atom and their acceptance by the oxidation agent (corrosive gas). A metal atom which is susceptible to corrosion must therefore be exposed to an active atom of the oxidation agent. 

This makes clear how the oil-sealed pump is protected against corrosion the concentration of the oxidation agent in the oil is negligible and thus the opportunity for the metal to release electrons is equally small. This also makes it clear that the use of so-called non-rusting or stainless steels does not make sense since oxidation is necessary for the passivation of these steels, in order to reach the so-called passive region for these steel compounds. The aitical passivation current density will normally not appear in oil-sealed pumps. 

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