Combustible Dust PSR Requirements in Ontario (Regulation 851 Section 7 Guide)
Combustible Dust PSR Requirements in Ontario (Regulation 851 Section 7 Guide)
Combustible dust systems are one of the highest-risk triggers for a Pre-Start Health & Safety Review (PSR) under Ontario Regulation 851 – Industrial Establishments, Section 7.
If your facility installs or modifies a dust collection system, explosion risk must be evaluated before startup. Begin with the full trigger determination guide:
Regulation 851 PSR Trigger Determination
Combustible dust hazards are often evaluated alongside other risks such as safeguarding systems. See also:
Machine Guarding PSR Requirements
Compliance Snapshot – Combustible Dust PSR
- Legislation: O. Reg. 851, Section 7
- Trigger Category: Explosion / fire hazard
- Common Systems: Dust collectors, cyclones, ducting systems
- Engineer Requirement: Ontario-licensed Professional Engineer
- Timing: Before operation or worker exposure
What Is Considered a Combustible Dust Hazard?
Combustible dust consists of fine particulate materials that can ignite or explode when suspended in air under certain conditions.
Common industries affected include:
- Woodworking and sawmills
- Food and grain processing
- Plastics and chemical manufacturing
- Metal processing and powder handling
Even materials that appear non-hazardous in bulk can become explosive when finely divided.
When Does a Dust Collection System Trigger a PSR?
A PSR may be required when:
- A new dust collection system is installed
- Existing ducting or collectors are modified
- Material type or process changes introduce explosion risk
- Explosion protection systems are added or modified
The determining factor is whether the system introduces a risk of ignition, fire, or explosion under Section 7.
Common Compliance Failures in Dust Systems
- Lack of explosion venting or suppression
- Improper ducting design allowing dust accumulation
- Inadequate isolation between system components
- Failure to assess ignition sources
- No documented hazard analysis
These deficiencies can result in severe incidents and enforcement under the OHSA.
Engineering Review Elements in a Dust-Related PSR
- Hazard identification and explosibility assessment
- Dust collection system design review
- Explosion venting or suppression analysis
- Ignition source control
- Material handling and accumulation risks
- Compliance with applicable NFPA and industry standards
Related Fire and Explosion Risk Resources
PSR Services for Dust Collection Systems
HITE Engineering provides PSR trigger determination and full engineering review for combustible dust systems across Ontario.
Pre-Start Health & Safety Review Services
Need a Combustible Dust PSR?
Contact HITE Engineering to assess your dust collection system before commissioning.
FAQ: Combustible Dust PSR Ontario
Do dust collectors require a PSR in Ontario?
They may. If the system introduces a risk of fire or explosion under Section 7, a PSR is required.
What makes dust “combustible”?
Fine particles that can ignite when suspended in air and exposed to an ignition source are considered combustible.
Who evaluates combustible dust PSR requirements?
A Professional Engineer licensed in Ontario must evaluate and approve the PSR.
Are NFPA standards used in Ontario PSRs?
Yes. NFPA standards are commonly referenced when evaluating explosion risks in dust systems.
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