通风橱培训课件.ppt

Fume Hood Training通风橱培训,Fume Hoods contd通风橱,All fume hoods at JR Laboratories have a minimum face velocity of 0.75m/s JR实验室所有通风橱最小表面速度是0.75米/秒This accommodates WCB regulations for the required face velocity when working with carcinogens, or possible carcinogens in a fume hood这符合WCB法规中关于通风橱中使用致癌物质或可能致癌物质表面速度的要求,Fume Hoods contd通风橱,A higher face velocity (0.75m/s) is not necessarily better再高的表面速度(0.75m/s) 不一定好An extremely high face velocity can cause turbulence and force the air back out toward the operator太高的表面速度可能导致扰动,使空气返吹向操作者,Fume Hoods contd通风橱,The face velocity will not be maintained if the sash is placed above the certified markings on the fume hood如果窗框置于通见橱规定标记以上,就不能保持表面速度The sash placement marking is certified by a professional to ensure a face velocity of 0.75m/s is maintained across the front of the fume hood窗框放置标记是由专业人员认定的,以保证在通风橱的前部表面速度保持在0.75m/s,Fume Hoods contd通风橱,Leave sash lowered when: 将窗框拉下Not attending experiment不需要人看管的实验Overnight隔夜,Fume Hoods contd通风橱,Avoid rapid movement around the fume hood避免在通风橱周围快速移动A technician walking rapidly past the front of a fume hood will cause turbulence in the air技术人员快速走过通风橱,会引起空气扰动Result: Air from the inside of the fume hood is drawn out, and follows the technician后果:空气从通风橱中溢出,随操作人员的方向流动,Fume Hoods contd通风橱,All equipment/apparatus must be placed at least 6 inches behind the front of the fume hood所有设备/仪器须置于离通风橱门至少6英寸Air flow is otherwise blocked and forced back out towards the operator否则阻碍空气流动,迫使空气流向操作人员All fume hoods must have marking indicating the 6 inch position所有通风橱须标记6英寸位置,Fume Hoods contd通风橱,Large pieces of equipment must be raised a few inches off the work surface 大型设备需举高,离开工作表面几英寸Allows air to travel underneath the equipment towards the lower baffle opening使空气在设备下面流向低隔板孔,Fume Hoods contd通风橱,DO NOT store anything in the fume hood that can be safely stored elsewhere in the lab不得在通风橱中存放可在实验室其它地方安全存放的物品Clutter will cause turbulence of incoming air混乱放置将引起进入通风橱空气的扰动,Fume Hoods contd通风橱,DO NOT block the rear baffle