Читать книгу Agitator Design for Gas-Liquid Fermenters and Bioreactors - Gregory T. Benz - Страница 35

Although not all agitators have shaft seals (some are mounted on open‐top tanks or basins), those used in fermenters almost always do. The purpose of the seal, in addition to maintaining tank pressure or vacuum, is to isolate tank contents from the outside environment. This may be done to keep foreign matter from contaminating the broth or to protect plant personnel from exposure to potentially harmful organisms or gases. Often, the shaft seal area is heated to create a sterile barrier. More information on shaft seals will be found in Chapter 15.