Push-Pull Ventilation of Open Surface Tanks

3 Push-Pull Ventilation of Open Surface Tanks 

For large open surface tanks where access for machinery or operators is required above the tank, the options for ktcal ventilation are limited. An over-head canopy would block access, and an exhaust hood placed at the side of the tank is prohibitively expensive for tanks greater than about 0.6 m across. 

In these cases, push-pull ventilation offers an appropriate mechanism for reducing the overall flow rate required, compared with side exhaust, by up to 50%, while still maintaining dear overhead access. 

Push-pull ventilation systems for open surface tanks consist of two components the push flow is generated by a jet or series of jets that are blown across the surface of the tank towards an exhaust hood along one side of the tank, which pulls and removes the fluid from the jet containing the contaminant. This is shown schematically in Fig. 10.69. 

3 Different Forms and Boundaries Relative to Other Types 

---