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Firelock Valves

  1. Rotary valve passive isolation engineering calculations report (detailed)
  2. Baum Pneumatics rotary valve firelock engineering design Report

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passive isolation calculations for firelock feeders

Below is a short summary of BAUM PNEUMATICS research into the maximum safe clearance in firelock feeders as per NFPA69.

  • Dried all fine SPF wood dust with Kst of 202.3 was used in calculations
  • Wood dust size, explosion characteristics, and heat transfer was considered in the calculations
  • Particle motion and Fluid-Particle interactions were calculated to account for redistribution of charge due to explosion

The results showed that the trade-off between clearance and blade thickness can be used to maintain firelock behavior of the feeders.

The maximum safe clearance of 0.012 (in) was calculated above which the clearance is unlikely to stop the flame from propagating.

NFPA Recommended Clearance of 0.0079 (in) or 0.2 (mm)

Flame does not propagate through Blade/ Body clearance! Blade thickness is 0.25 (in).

Calculated Maximum Allowed Clearance of 0.012 (in) or 0.3 (mm)

Blades can successfully stop flame propagation through the 0.012 (in) clearance! Blade thickness is 0.5 (in).

Failed Calculated Clearance of 0.014 (in) or 0.35 (mm)

Second explosion occurs at right hand side. Clearance of 0.014 (in) fails to stop flame propagation. Blade thickness is 0.5 (in).

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