Baghouse or Dust Collector General Troubleshooting

 

Technical Service & Troubleshooting

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DR. DIRT

 

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We welcome telephone consultations and offer FREE advice. Our fee-based Technical Service provides on-site evaluations and in-depth analysis.

 

SOME COMMON SYMPTONS AND THE PROBLEMS THAT CAUSE THEM

I. High Differential Pressure and/or Short Bag Life

A. Design Problems

1. High dust loading

2. High air-to-cloth ratio

3. High can velocity

4. Improper fabric or surface treatment

5. Improper or undersized discharge device

B. Operational Problems

1. Poor start-up technique

2. Improper damper settings

3. High moisture content and low temperature in gas stream

C. Maintenance Problems

1. Poor bag installation

2. Faulty differential pressure gauge

3. Leakage through discharge device

4. Valve and solenoid failures

5. Wet or oily compressed air

6. Timer faulty

1.      Wet bags

 

Staclean Is Your Single Source Supplier for All Your Baghouse Needs.

Fast Response, Budget Estimates, Firm Quotes,

Additional Information: 800-438-3850 or webinfo@staclean.com

 

II. Abnormally Low Differential Pressure

A. Operational Problems

1. Over cleaning of bags due to excessive pressure or frequency of pulse

B. Maintenance Problems

1. Line(s) plugged

-blow back through lines

-protect sensing point from dust or water build-up

-incorporate auto-purging system in sensing lines

-if lines are copper, air purge them yearly to release trapped moisture

2. Manometer line(s) broken or uncoupled

III. Baghouse Dusting

A. Design Problems

1. Extremely high air-to-cloth ratio

2. Poor bag attachment/seal arrangement

3. Extremely fine dust (less than .5 micron in high concentration)or very fine spherical particles

4. Wrong fabric or surface treatment

5. Wrong bag size

B. Operational Problems

1. Wrong damper settings

2. Poor start-up procedure

C. Maintenance Problems

1. Poor bag installation/seal

2. Leaks in tubesheet

3. Holes in bags

1.      Bad diaphragms or solenoids

 

Technical Service & Troubleshooting

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Problems?

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DR. DIRT

 

Drdirt@staclean.com

 

 

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IV. Puffing Back

A. Operational Problems

1. High pressure drop across baghouse

2. Low system fan speed

3. Improper duct balancing

B. Maintenance Problems

1. Plugged duct lines

2. Poor hood design

V. Excessive Build-up in Hopper

A. Design Problems

1. Rotary air lock too slow

2. Outlet too small (briding)

3. Improper discharge device

4. Improper hopper slope

B. Operational Problems

1. Failure to initiate discharge device prior to start-up

2. Failure to operate discharge device after fan shut-down

3. On high temperature systems, failure to pre-heat and cool down system properly causing moist conditions

C. Maintenance Problems

1. Rotary air lock needs re-building

2. Excessive rust or build-up on hopper walls

3. Material has become packed and won't flow

VI. Low Dust Discharge

A. Operational Problems

1. Inleakage at discharge points

2. Re-entainment of dust on filter bags

B. Maintenance Problems

1. Malfunction of discharge valve, screw conveyor or material transfer equipment

1.      Re-entrainment of dust within collector possible leaks in hopper.

 

Staclean Is Your Single Source Supplier for All Your Baghouse Needs.

Fast Response, Budget Estimates, Firm Quotes,

Additional Information: 800-438-3850 or webinfo@staclean.com

 

VII. Holes in Bags

A. Design Problems

1. Improper fabric, failure due to incompatibility with gas stream

2. Inlet abrasion from excessive inlet velocity

3. Excessive vibration in structure causing bags to rub together

4. Warped tubesheet causing bags to rub together

B. Operational Problems

1. Inlet temperature too high

2. Sparks in inlet gas stream

3. High moisture, moderate heat which can cause hydrolysis

C. Maintenance Problems

1. Failure to clean tubesheet, bags are sandblasted

2. Bent cages rubbing walls or each other

3. Excessive pulse cleaning

4. Bags damaged during installation

S. Broken cage wires

6. Improper bag installation

VIII. Loud or Unusual Noises

A. Maintenance Problems

1. Vibrations

2. Banging of moving parts

3. Squealing of belt drives

B. Pulse system

1. Valves not pulsing

a. Check power to timer

b. Check differential pressure switch electrical connection

c. Check differential pressure switch setting

d. Check differential pressure switch lines

e. Check header pressure

f. Check solenoid electrical connection

g. Check solenoid connection to diaphragm valve

h. Check solenoid coil

i. Check solenoid sub assembly for trash or rust

j. Check solenoid air outlet port

k. Check diaphragm valve air outlet port

1. Check diaphragm valve internals for broken spring, trash, etc.

2. Hissing sound (possible compressed air leakage)

a. If solenoid air outlet is leaking

i. check electrical connection

ii. check sub assembly for trash; clean with WD 40

b. If diaphragm valve outlet port is leaking

i. check air line to solenoid

ii. check header pressure

iii. check inside valve body for pitting and trash

iv. check membrane for wear

 

Technical Service & Troubleshooting

Questions?

 

Problems?

Drdirt@staclean.com

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DR. DIRT

 

Drdirt@staclean.com

 

 

Let 25 years of Experience for Dr Dirt Work For You

 

IX. Corrosion

A. Operational Problems

1. Dew point excursions

2. Improper shutdowns

B. Maintenance Problems

1. Improper paint material or application

2. Improper insulation

1.      Emission of nearby equipment

 

 

 

 

 

 

 

 

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