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BAGHOUSE: PRE-START UP
HIGH TEMPERATURE -BAGHOUSE START-UP

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 FEBRUARY 1993 "BLACK LIGHT TEST" - LEAK DETECTION PURPOSE:  The purpose of the "Black Light Test" is to locate air/dust leaks in a baghouse between the clean and dirty side. DESCRIPTION:    A  bright  fluorescent  powder  is  fed  into  the  inlet  duct  work  of  the  baghouse  where  the  particles  are dispersed uniformly in the airstream.  The fluorescent powder is  collected  on  the  bags  in  the  same  manner  as  the  dust particles.  Should there be a leak in any of the bags, the connection of the bag to the tubesheet, or in the seams of the tubesheet, the powder will pass through to the clean side where it can be detected with the use of a ultraviolet lamp. EQUIPMENT: - Ultraviolet lamp - Fluorescent powder, green - Fluorescent powder, orange TEST PROCEDURE: 1. Test at night (or in a darkened condition) 2. Start induced draft fan. 3. Slowly feed one color of powder into the inlet duct at the hood, a duct clean out door, or any convenient location upstream of the baghouse. - Dirty baghouse: 1 lb./1000 sq.  ft.  cloth area - Clean baghouse: 1/2 lb./1000 sq.  ft.  cloth area 4. Shut down fan. 5. Use proper LOCKOUT/TAGOUT devices on all energy sources before entering the baghouse. 6. Enter the clean air side of the baghouse with the ultraviolet lamp turned on and search for signs of the fluorescent powder which will glow either green or orange where the powder has leaked through. Especially look; - around the perimeter of the tubesheet where it attaches to the wall. - at each seam of the tubesheet where it is made in multiple sections. - around the perimeter at the top of each bag where it attaches to the tubesheet. - down inside the bag. 7. If fluorescent powder is found, determine the cause of the leakage, and correct by; - welding or caulking the tubesheet. - removing the bag and reattaching to the tubesheet properly. - replacing any bags found to be leaking through holes. Note:    New  bags  have  a  higher  porosity  than  used  bags.    It  is  not  uncommon  for  dust  or  the fluorescent  powder  to  bleed  through  the  fabric  or  needle  holes  of  new  bags  in  small  quantities. This condition is only temporary and should cease after a few hours of operation. 8. Repeat steps #1 - 7 with a different color of powder until all leaks are eliminated. page 3-691







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