Bag Shredder Hazop
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POLYWOVEN BAG SHREDDER FLOWSHEET
Feeding point
Shredding
Conveying
Feeding
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Feeding broken bags at feeding point Item
Deviation 1.1 High feed rate
Consequences Jammed shredder rotors Operator feeding too much broken bags causing the drive to trip Causes
Safeguards none
Recommendations Prepare a feeding procedure
Blocked inlet chute causing feeding to be stopped none
Prepare a feeding procedure Prepare a feeding procedure
1.2 Low feed rate
Operator feeding less bags
Shredder discharges less than 200kg per hour
none
1.3 Poking
Broken bags not moving freely in feed chute
Jerking of poking stick on operator
Rotor shields are in Operator to use stick place while on level ground
Page 2
Shredding
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Shredding broken bags in the shredding compartment Item
Deviation Inconsistent discharge of 2.1 shreds
2.2 Low feed rate
Causes
Consequences
Operator feeding broken bags inconsistently Accumulation of shreds in discharge hopper
Throughput less than 200kg per hour none Residency time in grinding chamber none
Operator feeding less bags
Shreds electrostatically sticking in grinding chamber none Shredder discharges less than 200kg per hour none
Safeguards
Recommendations Prepare a shredding procedure Check and sharpen rotor or stator blades Regular checking/emptying chamber Prepare a feeding procedure
Sacks being shredded/loaded as they Dust emmision on are from packing packing with remnants Operator discomfort, of cement dust respiatory disceases 2.3 shredding
Use dust masks always
Noise on shredding 2.4 machine
Always use Noise Noise mufflers as PPE mufflers as PPE
Equipment designed without noise enclosure
Operator ear damage
Page 3
Coonect shredder to a medium duty dust collector
Conveying
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Conveying shredded bags into hopper for firing Item
Deviation
Causes
Packing shreds into portable No conveying means from shredder exists 3.1 sacks
Consequences Manual handling of shredded bags into the firing hopper
Page 4
Safeguards
Recommendations
none
Locate receiving packaging onto the shreeder discharge area.
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Startup, shutdown and maintaining shredder Item
Deviation 4.1 Testing failure
4.2 Maintenance
Causes
Consequences
Safeguards
No power supply
Machine will not run
none
Recommendations Check power supply circuit for completeness
Equipment due for maintenance
artisan injuries on opening grinding compartment knives or servicing, lifting up granulator chamber
Use purpose specific limit switches foe components being worked on
Follow recommended maintenance procedure as per manual for specific areas being maintained
Equipment jammed while in operation
Sacks/foreign bodies inside Locking bars, limit grinding chamber. Injuries switches, physical due to crushing barriers
Follow recommended maintenance procedure as per manual for specific areas being maintained
Injuries and equipment damage
Follow operating instructions
Equipment wearing parts worn out
4.3 Thermal fire
Throwing cans inside grinding compartments
Feeding point
Shredding
Conveying
Feeding
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Feeding broken bags at feeding point Item
Deviation 1.1 High feed rate
Consequences Jammed shredder rotors Operator feeding too much broken bags causing the drive to trip Causes
Safeguards none
Recommendations Prepare a feeding procedure
Blocked inlet chute causing feeding to be stopped none
Prepare a feeding procedure Prepare a feeding procedure
1.2 Low feed rate
Operator feeding less bags
Shredder discharges less than 200kg per hour
none
1.3 Poking
Broken bags not moving freely in feed chute
Jerking of poking stick on operator
Rotor shields are in Operator to use stick place while on level ground
Page 2
Shredding
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Shredding broken bags in the shredding compartment Item
Deviation Inconsistent discharge of 2.1 shreds
2.2 Low feed rate
Causes
Consequences
Operator feeding broken bags inconsistently Accumulation of shreds in discharge hopper
Throughput less than 200kg per hour none Residency time in grinding chamber none
Operator feeding less bags
Shreds electrostatically sticking in grinding chamber none Shredder discharges less than 200kg per hour none
Safeguards
Recommendations Prepare a shredding procedure Check and sharpen rotor or stator blades Regular checking/emptying chamber Prepare a feeding procedure
Sacks being shredded/loaded as they Dust emmision on are from packing packing with remnants Operator discomfort, of cement dust respiatory disceases 2.3 shredding
Use dust masks always
Noise on shredding 2.4 machine
Always use Noise Noise mufflers as PPE mufflers as PPE
Equipment designed without noise enclosure
Operator ear damage
Page 3
Coonect shredder to a medium duty dust collector
Conveying
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Conveying shredded bags into hopper for firing Item
Deviation
Causes
Packing shreds into portable No conveying means from shredder exists 3.1 sacks
Consequences Manual handling of shredded bags into the firing hopper
Page 4
Safeguards
Recommendations
none
Locate receiving packaging onto the shreeder discharge area.
HAZOP REVIEW OF SHREDDING POLYWOVEN BAGS IN ENCLOSURE Intention: Startup, shutdown and maintaining shredder Item
Deviation 4.1 Testing failure
4.2 Maintenance
Causes
Consequences
Safeguards
No power supply
Machine will not run
none
Recommendations Check power supply circuit for completeness
Equipment due for maintenance
artisan injuries on opening grinding compartment knives or servicing, lifting up granulator chamber
Use purpose specific limit switches foe components being worked on
Follow recommended maintenance procedure as per manual for specific areas being maintained
Equipment jammed while in operation
Sacks/foreign bodies inside Locking bars, limit grinding chamber. Injuries switches, physical due to crushing barriers
Follow recommended maintenance procedure as per manual for specific areas being maintained
Injuries and equipment damage
Follow operating instructions
Equipment wearing parts worn out
4.3 Thermal fire
Throwing cans inside grinding compartments
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