How do I perform a leak test of the Dorr-Oliver cyclone?
The Cincinnati Technical Center has put together a set of instructions on leak testing procedures. Click here for the document. I need to sample a sand-blasting operation in a room that has no forced ventilation. The blasting lasts only 20 minutes each day. The employee wears a hood only during the operation. The employee spends 8 hours a day in the same room with other employees performing other activities. How long should I sample? Sample the whole 8-hour work day. If respirable silica dust is generated during the blasting, it will remain suspended long afterward. The air is rarely still enough for the dust to completely settle. The activities of the employee and his/her coworkers would also resuspend dust that has settled on their clothes. Dust can also be resuspended when workers pass by or over dusty surfaces, such as the factory floor and when they perform any inappropriate cleanup operations such as dry sweeping or using an ordinary shopvac. While IHs are often tempted to sample
