Air shower is a special enclosed space that is inserted as the entrance to cleanrooms and other controlled environments to reduce particulate contamination. High-pressure air shower, HEPA or ULPA filtered to remove dust, fibrous fibers and other contaminants from the surface of objects or objects. The strong "cleansing" of the surface before entering a clean environment reduces the amount of airborne particulates introduced.
When properly incorporated into the cleanroom design, the air showers provide an ISO circled circular space to ensure cleanliness of the classified clean room. The water shower is usually placed between the gowning and cleanroom areas; after workers wear appropriate clothes and personal protective equipment, they enter the bathroom so that the pressurized air nozzle removes the remaining particles from the shirt. After the program cycle is over, the user exits through the second door, into the cleanroom. Air showers (or air tunnels) can also be placed between cleanrooms of various ISO ratings.
Video Air shower (room)
Design and function
The air shower is generally made of steel or plastic material compatible with the cleanroom and has a blower, filter, and electronic pressurized jet nozzles, the latter inserted into the walls and ceiling of the room. Air, at a rate of 3,000 to 7,000 feet per minute (FPM), continues to flow from jet nozzles for 30-45 seconds, effectively removing loose particles. Personnel inside the cage will lift their arms and twist their bodies for uniform exposure to the airflow, a procedure typically specified in the protocol. Air currents from jets create shear and flap strength, which lift and remove contaminants from both flat surfaces and folds of clothing. HEPA screening in the air shower is capable of removing 99.97% of particles larger than 0.3 m in diameter.
Air is channeled in the air shower using a closed-loop system, where it continues to be recirculated. Air is forced through a motorized filter/blower module into a large conference room, then to the bathroom via a jet nozzle. The contaminated, contaminated air is removed from the shower compartment through the floor vents and returned to the filtration unit. This process ensures that only decontaminated air is used to remove particulates from personnel and other equipment, such as supply carts.
Often, the air fountains are equipped with air ionizers to reduce static electricity, because large volumes of high-speed air create electrical charges. Because laboratory equipment, electronic measurements and many hi-tech manufacturing goods can often be damaged by electrostatic discharges, ionizers are essential in providing an electrically neutral surface material before entering the restroom.
Maps Air shower (room)
Security
The interlocking mechanism is a common air shower feature to prevent both exit doors from being opened simultaneously, which will allow outside air into a tightly controlled environment. This requires the occupants to stay inside until the decontamination cycle has been completed. For this reason, safety features such as emergency stop are required by most safety administration. Or, the air showers may consist of long tunnels not equipped with doors; personnel slowly walk to reach the controlled area. Air handling equipment creates an isolated atmosphere using a pressure difference to create a fluid boundary between the inner and outer environments.
External links
- Cleanroom sign in and out procedures
- Water shower used in NASA
References
Source of the article : Wikipedia
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