Hepa filters PPT

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Hepa filters PPT

  1. 1. Air cleaning systems Join us on PHARMASTUFF UPDATES group on FACEBOOK
  2. 2. What is a HEPA FILTER? HEPA is an acronym for “High Efficiency Particulate Air” This type of air filter can remove at least 99.97% of dust, pollen, mold, bacteria and any airborne particles with a size of 0.3 micrometres (μm) Join us on PHARMASTUFF UPDATES group on FACEBOOK
  3. 3. Types of HEPA FILTERS Types Application Performance A industrial, noncritical 99.97 % @ 0.3 µm B nuclear containment 99.97 % @ 0.3 µm (certified by DOE) C laminar flow 99.99 % @ 0.3 µm D ultra-low penetration air ULPA 99.9995 % @ 0.12 µm E stopping toxic, nuclear, chemical and biological threats 99.999 % efficiency Join us on PHARMASTUFF UPDATES group on FACEBOOK
  4. 4. Construction: HEPA filter is constructed of borosilicate microfibres in the form of pleated sheet Sheet is pleated to increase the overall filtration surface area. The pleats are separated by serrated aluminum baffles or stitched fabric ribbons, which direct airflow through the filter Join us on PHARMASTUFF UPDATES group on FACEBOOK
  5. 5. Construction This combination of pleated sheets and baffles acts as filtration medium. It is installed into an outer frame made of fire-rated particle board, aluminum, or stainless steel The frame-media junctions are permanently glued or ‘‘pot-sealed’’ to ensure a leak proof Join us on PHARMASTUFF UPDATES group on FACEBOOK
  6. 6. HEPA FILTER Join us on PHARMASTUFF UPDATES group on FACEBOOK
  7. 7. Filtration Mechanisms:  1. Inertial Impaction : particle inertia causes it to leave the flow streamlines and impact on the fiber. Join us on PHARMASTUFF UPDATES group on FACEBOOK
  8. 8. Filtration mechanisms: 2. Diffusion: The particles traverse the flow stream, they collide with the fiber and are collected. Join us on PHARMASTUFF UPDATES group on FACEBOOK
  9. 9. Filtration mechanisms:  3.Interception : These mid-sized particles follow the flow stream as it bends through the fiber spaces. Particles are intercepted or captured when they touch a fiber. Join us on PHARMASTUFF UPDATES group on FACEBOOK
  10. 10. HEPA in Laminar air flow systems Laminar air flow systems are used for cleaning air in aseptic rooms. In laminar air flow systems,clean air is obtained through HEPA filters This air flows at a speed of 100 ft/min & sweeps dust particles making entire room free of particulate matter Join us on PHARMASTUFF UPDATES group on FACEBOOK
  11. 11. Classification of clean rooms Six classes have been established to designate cleanroom cleanliness . Class 1 Class 10 Class 100  Class 1,000 Class 10,000 Class 100,000 Join us on PHARMASTUFF UPDATES group on FACEBOOK
  12. 12. Types of Laminar air flow systems Laminar air flow systems are of 3 types 1. Downward flow systems 2. Horizontal flow systems 3. Wall to floor flow systems Join us on PHARMASTUFF UPDATES group on FACEBOOK
  13. 13. Downward flow systems This system consists of false floor & ceiling The air is filtered through pre- filters ,electroststic filters and HEPA filters in sequence These 3 filters are placed in false ceiling From the false floor,a small portion of filtered air is recirculated in to false ceiling through a recirculation duct. Join us on PHARMASTUFF UPDATES group on FACEBOOK
  14. 14. Horizontal flow systems The air is filtered through prefilters ,HEPA filters which are placed in lateral walls. Air is recirculated through punched plate wall or recirculation duct. Achievement of complete sterile conditions is not possible because the airflow is not focussed on working area Join us on PHARMASTUFF UPDATES group on FACEBOOK
  15. 15. Wall to floor flow systems: The filtered air enters from lateral wall with an inclined flow towards the floor. In this system working area is offered with high aseptic conditions. This system is more expensive Join us on PHARMASTUFF UPDATES group on FACEBOOK
  16. 16. Conditions That Will Damage HEPA Filters Moisture: 95-100% relative humidity Hot air: greater than 275 °F Fire: direct fire or high concentrations of particulate matter produced by fire High pressure: 8 in. of water, gauge (in. wg) internal or differential across filter media Join us on PHARMASTUFF UPDATES group on FACEBOOK
  17. 17. Conditions That Will Damage HEPA Filters Corrosive : dilute moist or moderately dry concentrations of acids and caustics Any acid and some caustics will attack uncoated aluminum separators Hydrofluoric acid will attack the media Nitric acid Shock pressures Join us on PHARMASTUFF UPDATES group on FACEBOOK
  18. 18. Shipment,storage,handling:   The HEPA filter is extremely fragile and should be shipped, stored, and handled in the same manner as delicate instrumentation. Personnel responsible for receiving and handling HEPA filters should receive training in proper handling technique. All incoming HEPA filters should be visually inspected for apparent Join us on PHARMASTUFF UPDATES group on FACEBOOK

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