dust collector fire? learn how to stay safe and prevent damages
TRANSCRIPT
POST-FIRE INSPECTION PROCEDURES
www.slyinc.com800-334-2957
LEARN HOW TO STAY SAFE AND PREVENT DAMAGES
DAMAGE INSPECTION
• Tubesheet• Pulse pipes• Hopper• Entryways• Bolted flanges• Compressed air piping
• Housing walls• Downstream
equipment• Rupture panels
(explosion vents)• Overall inspection
TUBESHEET• Check for warped
Tubesheet• Any deviation of more
than ¼” in a 24” span is considered excessive– Place a two-foot-long
straight edge at any location on the tubesheet and if the distance from “high spots” to “low spots” is over ¼”, damage is excessive.
PULSE PIPES• Fire damage in pulse
pipes is rare– Abrasive wear might be
present in older collectors
• Look for damage and replace as needed
HOPPER• Look for accumulation
of debris and molten metal in the bottom of the hopper
• Remove as much as possible
Pyramidal hopper
ENTRYWAYS• Look at– Access doors– Ports– Roof hatches– Other external entry points
• Search for warpage preventing doors and ports from properly sealing
• Straighten or replace excessive damage
BOLTED FLANGES• Check bolted flanges for damage, including brittle,
powdery, or hard textures which can cause cracks, breaks, and gaps– Pay special attention to tubesheet-housing connection
and hopper-housing connection• Methodology– Slide short, flat piece of metal between flanges to check
for gaps– Look for daylight through the flange connections when inside unit
COMPRESSED AIR PIPING• Inspect– Clamps– Hoses– Tubing
• Don’t forget– Wall grommets– Morris pipe clamps– Diaphragm
valve/solenoid valve tubing
• Replace damaged parts as needed
Photo credit: http://3.imimg.com/data3/TJ/AM/MY-9263877/compressed-air-pipe-250x250.jpg
HOUSING WALLS• Search for excessive distortion or permanent
deflection of the housing walls• Warpage creates contact with the installed filter
bags and causes premature wear• Distorted stiffeners lowers allowable design
pressure• Distortion generally cannot be straightened– Replacement may be required
DOWNSTREAM EQIPMENT
• Look at downstream equipment– Pay close attention to
components parts (e.g. the fan)
• Damage most likely confined to debris
• Fan bearings may be affected if exposed to fire or molten debris
RUPTURE PANELS• Check to ensure explosion vents are not damaged
or weakened• Repair or replace as needed
OVERALL INSPECTION• Use common sense• What “doesn’t look
right” to you?• Call us with any
questions or concerns at 800-334-2957
PREVENTION• Scorch damage• Ductwork• Rupture panels (explosion vents)• Witnesses
SCORCH DAMAGE• Look for scorch damage, or discoloration, of
paint• Discoloration high on housing may mean a
fire on filter bags– Determine source of fire (i.e. the “spark”)– Consider grounded filters
• Discoloration low on housing may indicate a hopper fire
DUCTWORK• Look for similar scorch damage, or
discoloration, on paint on the ductwork• May indicate fire started in or before the
ducting and was drawn into baghouse by fan• Isolation or suppression equipment in
ductwork may be warranted
RUPTURE PANELS• If baghouse experienced a fire, but not an
explosion, rupture panels may have malfunctioned• Inspect for damage and replace as needed
Photo credit: https://en.wikipedia.org/wiki/Explosion_vent
WITNESSES• Talk to employees,
maintenance personnel, etc.
• Isolate the starting point of the fire and address suppression and control at that location
POST-FIRE INSPECTION PROCEDURES,REPAIR AND PREVENTION
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@tweetslyinc
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