Application
Explosion Isolation in Petrochemicals
Answer in brief
In petrochemical plants dust isolation has to coexist with gas safety rules.
The devices sit in classified areas and must satisfy both sets of requirements, which narrows the selection.
- Assess dust and gas together for the device location.
- Cover polymer and catalyst handling, which is where the dust is.
- Keep the documentation consistent with the gas safety case.
Reviewed October 21, 2026 · Updated October 21, 2026
The problem
Polymer powders and catalysts form explosible clouds, and the surrounding plant is classified for gas, so devices have to meet both.
Desired outcome
Every connection between protected vessels either carries a tested isolation device or is shown not to need one.
Process approach
Device selection starts from the area classification and the dust characteristics together, and the documentation is integrated with the existing safety case.
Hybrid atmospheres reduce the ignition energy and change the detection requirements.
- Device suitability for the classified area and the dust.
- Hybrid atmosphere assessment.
- Documentation consistent with the plant safety case.
Selection factors
- Area classification at each device position.
- Explosion characteristics of the polymer or catalyst dust.
- Credible presence of hydrocarbon vapour.
- Duct geometry and available distances.
- Maintenance regime under permit conditions.
Common failure modes
- Device suitable for dust but not for the classified area
- Hybrid atmosphere lowering the ignition energy unnoticed
- Dust safety case kept separate from the gas safety case
- Static ignition in a polymer line with no isolation downstream
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