在正常运行过程中,可能出现粉尘数量足以形成可燃性粉尘与空气混合物但未划入20区的 场所。 该区域包括,与充入或排放粉尘直接相邻的场所、出现粉尘层和正常操作情况下可能产生可 燃浓 度的可燃性粉尘与空气混合物的场所。 Area not classified as zone 20 in which combustible dust, as a cloud, is likely to occur during normal operation, in sufficient quantities to be capable of producing an explosive concentration of combustible dust in mixture with air. This zone can include, among others, areas in the immediate vicinity of powder filling or emtying points and areas where dust layers occur and are likely in normal operation to give rise to an explosive concentration of combustibl e dust in mixture with air. |