SGI vacuum pump-sets are single and multi stage units with a combination of several different sizes and types of rotary lobe blower stages.
SGI single stage rotary lobe blowers with very high suction capacity are used for vacuum regeneration of PVSA adsorption plants for oxygen generation.
SGI multistage vacuum pump sets are used for other PVSA adsorption plants for gas purification and many other applications in industry and research.
Typical SGI multi stage mechanical vacuum pump set application is the steel industry for VD/VOD/RH steel degassing using three to four stages with very high suction capacity in the middle and final vacuum.
VD/VOD/RH Steel degassing process requires short pump down time to final vacuum ≤ 1 mbara as well as high suction flow for VOD und RH blowing process in the rough vacuum range ≥ 200 down to > 10 mbara.
Therefore SGI is using gas pre- inlet cooled rotary lobe blower in combination with a screw vacuum machine, to be able to work up to ≥ 200 mbara pressure controlled as one unit to atmosphere.
Operation from ≤ 200 mbara down to > 10 mbara pressure controlled in series, gas pre inlet cooled stage- screw machine to atmosphere.
Operation ≤ 10 mbara down to ≤ 1 mbara in series, high vacuum rotary lobe stages- gas pre inlet cooled stage- screw machine to atmosphere.
All SGI vacuum pump sets can be executed in accordance to ATEX for cone 1 and 2.
Please see SGI publication „Efficient multi- stage vacuum pump sets for steel degassing“ as well as execution VOD process vacuum pump set to ATEX cone 1.