CSP-11 CSP-11 D6.01 · Domain 6 · Occupational Health and Applied Science · 10%
Combustible Dust
An indoor wood-products collector leaks fine dust onto roof joists and cable trays. Operations points to a clean aisle, a weekly broom schedule, and portable extinguishers. The return duct feeds the workroom and the collector relief path faces an occupied area. You are the CSP. Decide whether the hazard is controlled by asking where fuel can accumulate, how it can disperse, what can ignite it, and how flame or pressure could propagate.
Updated . Independent CSP-11 practice. Not BCSP-endorsed. No pass guarantee.
Decision rule
Combustible dust is fuel. Control fuel, oxygen, confinement, ignition, and dispersion.
A broom program is not a dust-hazard analysis.
In 20 seconds
- Combustible dust is fuel.
- Control fuel, oxygen, confinement, ignition, and dispersion.
- Combustible dust needs dust hazard analysis thinking: fuel, suspension, confinement, oxygen, ignition.
- Housekeeping and dust collection design prevent clouds and layers.
How to apply Combustible Dust
THEORY: DHA, housekeeping that removes layered fuel, ignition control, deflagration venting or suppression where the analysis requires it. Housekeeping that only looks tidy can still leave fuel aloft. CALC: None unless a stem gives Kst or Pmax — use those figures only. FIELD: Sugar or wood dust layered on beams over a bucket elevator. Stop and clean with a method that does not disperse a cloud; then DHA. ASSESS: Compressed-air blow-down as the cleaning method is the trap.
Worked case
Wrong first move: Blow it down Friday. Correct move: Remove layered fuel safely; complete the DHA; control ignition and confinement.
Why the rule holds
Related: 50, 82, 108.
Same rule, different setting
A grain-adjacent additive silo and a dusty compressor deck share a building. Operations says “it is just dust, not hydrocarbon vapor — a Type ABC and a broom on Fridays are enough.” You are the CSP. The question is whether the pentagon is already built overhead.
A site fab shop sands MDF and pulses a portable collector onto a mezzanine. The superintendent says “it is just dust — a Type ABC and a broom on Fridays are enough.” You are the CSP. The question is whether the pentagon is already built overhead.
Picture / model
Combustible-dust control starts with representative material and process characterization, then breaks the event sequence by reducing releases and deposits, controlling ignition, and providing competent explosion protection and propagation isolation where a credible deflagration can occur.
Exam traps
Original SafePath contrasts for Combustible Dust. These are study traps, not recalled BCSP items.
| Trap | Correct read |
|---|---|
| Fire triangle (fuel, air, ignition) | Incomplete — dust needs dispersion; explosion needs confinement |
| Dust pentagon | Fuel + oxidizer + ignition + dispersion + confinement |
| Friday broom in the aisle | Admin — often misses overhead layers that become the cloud |
| Explosion vent / suppress / isolate | Engineering sized to Kst and Pmax |
| Type ABC extinguisher | Residual firefighting — not an explosion-protection system |
Field move
Field decision: Characterize the material and process in a dust hazard review, remove accumulations safely, and evaluate collector explosion protection a....
Scenarios
Scenario 1 · Fundamental · CSP-11 D6.01
An indoor wood-dust collector leaks onto overhead beams while the floor remains clean. The facility has not characterized the dust or collector protection. What is the first design review?
Best action: Characterize the material and process in a dust hazard review, remove accumulations safely, and evaluate collector explosion protection and isolation.
Why: Evaluate the best response. Keep the exposure model the stem named. Do not mix OSHA and NIOSH exchange rates, treat an advisory value as a PEL, or convert a mixed fume with an ideal-gas equation. An indoor wood-dust collector leaks onto overhead beams while the floor remains clean. The facility has…
Scenario 2 · Applied Scenario · CSP-11 D6.01
Which set completes the combustible-dust explosion pentagon for a suspended fuel cloud?
Best action: Combustible dust, oxidizer, ignition, dispersion and confinement.
Why: Evaluate the best response. Keep the exposure model the stem named. Do not mix OSHA and NIOSH exchange rates, treat an advisory value as a PEL, or convert a mixed fume with an ideal-gas equation. Which set completes the combustible-dust explosion pentagon for a suspended fuel cloud? The best select…
Scenario 3 · Applied Scenario · CSP-11 D6.01
A sample reports Kst=150 bar·m/s and Pmax=8 bar. Which interpretation is correct?
Best action: Kst indexes deflagration severity; Pmax is maximum explosion pressure, so equipment design uses the appropriate tested properties.
Why: Evaluate the best response. Keep the exposure model the stem named. Do not mix OSHA and NIOSH exchange rates, treat an advisory value as a PEL, or convert a mixed fume with an ideal-gas equation. A sample reports Kst=150 bar·m/s and Pmax=8 bar. Which interpretation is correct? The best selection is…
If the stem says this
| Stem signal | Best direction |
|---|---|
| layers and clouds present with only dust masks proposed | housekeeping and engineering dust control first |
| DHA never done for a dusty process | analyze dust hazards systematically |
| household vacuum used on fine metal dust | use appropriate industrial methods |
| two answers work | higher hierarchy / system / design |
| ignition sources uncontrolled in dust area | control ignition and hot work |
Check before you leave
- ✓ Combustible dust needs dust hazard analysis thinking: fuel, suspension, confinement, oxygen, ignition.
- ✓ Housekeeping and dust collection design prevent clouds and layers.
- ✓ Explosion protection may include venting, suppression, isolation — after prevention.
- ✓ Do not vacuum with household cleaners inappropriate for combustible dust.
- ✓ Hot work in dust areas needs strict controls.
- ✓ Tramp metal and ignition source control matter.
Blueprint mapping
Combustible Dust is the SafePath study class for CSP-11 D6.01 inside CSP-11 Domain 6, Occupational Health and Applied Science (10%). This domain combines occupational hygiene with applied science: exposure assessment, public health, toxicology, ergonomics, chemistry, and physics.
SafePath uses the publicly posted CSP-11 outline as a study map. It does not reproduce official exam content, and it is not affiliated with or endorsed by BCSP or Pearson VUE.
Practice / flashcards / formulas
More classes in Occupational Health and Applied Science
Nearby lessons mapped to the same CSP-11 domain.
CSP-11 D6.01
Other classes on this task
Guides that use Combustible Dust
- CSP calculationsIncident rates, noise, ventilation, and unit checks
- Formula deskNamed expressions used in occupational-health items
- Manufacturing safety study guideExposure, noise, and process controls
- CSP-11 exam prep guideDomain weights, sample items, and a study sequence
- CSP-11 blueprint and weightsSeven published domains and the class map
Combustible Dust study questions
- What decision does the Combustible Dust class train?
- Combustible dust is fuel. Control fuel, oxygen, confinement, ignition, and dispersion. This is independent SafePath CSP practice for CSP-11 D6.01. It is not an official BCSP item and it is not a pass guarantee.
- What exam trap shows up in Combustible Dust?
- A common miss treats this as sufficient: Fire triangle (fuel, air, ignition) The stronger read is: Incomplete — dust needs dispersion; explosion needs confinement
- How does Combustible Dust map to the CSP-11 blueprint?
- SafePath maps this class to CSP-11 D6.01 in Domain 6, Occupational Health and Applied Science (10% of the published blueprint). Use the public outline for study planning. SafePath is not affiliated with or endorsed by BCSP.
Verify
Verify: Confirm current certification requirements with BCSP and technical requirements with the cited authoritative standard.