North Goonyella Fire HPI. 28th August 2018. “An inadvertent, rapid vent change resulted in a plug of methane purging from the goaf into the return general body.” “The TG return exceeding 2.5% for 13 minutes and #1 seal sampling triggered an orderly withdrawal under level 3 TARP36.
180828 an event causing the withdrawal of a person from the mine or part of the mine
These are the 3 High Potential Incidents between the 28th August and the 3rd of September Causing the Withdrawal of Workers.
This is the first.
The problem with HPI written notices is the lack of specific detail.
It is 19:15 pm when Inspector Marlborough is contacted nearly 2 and a half hours later
An inadvertent, rapid vent change resulted in a plug of methane purging from the goaf into the return general body.
For instance it states >2.5% Methane for 13 Minutes and occurred at 16:45 pm
No mention of
- What the “Inadvertent” rapid vent change was
- Where it occurred and why it occurred
- Actual percentage methane reached
- Ventilation quantity in 9 Nth Tailgate #1 Seal roadway
- Quantity of methane liberated
DATE: 28/08/2018 TIME: 16:45 LOCATION: NGC-9N Tailgate seal #1
An inadvertent, rapid vent change resulted in a plug of methane purging from the goaf into the return general body.
The TG return exceeding 2.5% for 13 minutes and #1 seal sampling triggered an orderly withdrawal under level 3 TARP36
OTHER INFORMATION/DETAIL: The rapid vent change pushed a plug of goaf gas into the TG return exceeding 2.5% for 13 minutes and #1 seal sampling triggered an orderly withdrawal under level 3 TARP36. After levels returned to Normal condition a risk assessment was conducted prior to re-entry
