ACARP ACARP ACARP ACARP
Underground

Bagged Barrier Testing at Overseas Facilities

Underground » Detection and Prevention of Fires and Explosions

Published: December 00Project Number: C7030

Get ReportAuthor: David Humphreys, Terry O'Beirne | ACIRL

The bag-barrier system, invented by the South African group, CSIR-Miningtek, and now used in Australia, represents a significant change to the management of explosion suppression in underground coal mines. This report summarises the initial testing of the bagged barrier leading to its recent use in Australia, and details the latest results from testing in the multi-heading Lake Lynn Experimental Mine in USA.

Original testing in Germany and South Africa was all undertaken in single-entry style test galleries, up to 22 m2 in section. Based on this, guidelines for their use were developed and adaptations made for Australian use. A Queensland Department of Mines Approval was granted in 1999.

This original testing has now been supplemented by testing in the multi-gallery Lake Lynn mine in the USA. From this testing, it is reasonable to conclude that the bagged barrier configurations considered were successful at preventing the propagation of a coal dust explosion in the heading in which they were installed. The flame extension in the base-line coal dust explosion was about 250m and this was significantly reduced by the presence of the concentrated or the distributed barrier in all the tests conducted.

It was also seen that:

  • The bagged barrier functions at dynamic pressures as low as 4kPa which is lower than other barriers previously studied by ACIRL, and validates prior testing in Germany and South Africa
  • Total dust dispersal efficiency is lower in a multi-heading environment than a single entry, but the barrier can function effectively
  • Bags suspended in areas of pressure equalisation, such as cross-cuts, did not operate as efficiently as in the headings (but nor would other barriers).

There were also indications that under some circumstances it would be possible for explosion to go around a barrier in marginally protected flanking roads. It is almost certain that at some point, reducing the stone dust concentration in flanking roadways would allow explosion propagation around an adjacent barrier. It can, therefore, be concluded, that all roadways need protection against explosion propagation, by explosion barriers and/or adequate stone dusting.

Nothing in the recent tests would suggest that barrier distances from possible sources of ignition, should be changed.

The testing at Lake Lynn was partially funded by ACARP who also engaged staff of ACIRL to partake in the trials and prepare this report.

Underground

Health and safety, productivity and environment initiatives.

Recently Completed Projects

C27039True Triaxial Strength Of Coal Measure Rocks And Its Impact On Roadway Stability And Coal Burst Assessment

Rocks in the ground are subject to a range of stresses. The stresses...

C3063Underground Vehicle Design Standards And Statutory Implications

The Australian underground diesel vehicle fleet has evolved since di...

C3064Conveyor Belting And Lagging Shear Characteristics - Drive Drum Slip

The primary aim of this project was to investigate the relationsh...

Underground

Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C26029Geological Controls On Fluorine And Phosphorus In Bowen Basin Coals

Increasing global restrictions on fluorine in product coal prompted ...

C28033Raw Ash To Yield Relationships

Correct outcomes in yield predictions for product ash from coal bore...

C27038Establishing Self-Sustaining And Recognisable Ecological Mine Rehabilitation

In recent years an increasing interest has been placed on mining ope...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C27064Dry Beneficiation Using FGX And X-Ray Sorters

Conventional dry processing methods engage a single beneficiation de...

C26010Multi-Sloped Screening Efficiency With Changing Strokes, Frequencies, Feed Solids And Feed Rates-Pilot Plant Study

Optimising multi-sloped screens is often described as an art and the...

C28059Impact Of Water Quality In Coal Handling And Preparations Plants

The objective of this project was to deliver a concise reference do...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C23052Novel Stone Dust Looping Process For Ventilation Air Methane Abatement

This multi‐phase project is concerned with the mitigation of m...

C27054Optimisation Of A Thermal Flow Reversal Reactor For Ventilation Air Methane Mitigation

Ventilation air methane (VAM) generally accounts for 50-85% of the t...

C28076Selective Absorption Of Methane By Ionic Liquids (SAMIL) - Phase 2 Demonstration In A Packed Bed Reactor

An alternative approach to high temperature oxidation of ventilation...

Mine Site Greenhouse Gas Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C16027Assessing Housing And Labour Market Impacts Of Mining Developments In Bowen Basin Communities

The focus of this ACARP-funded project has been to identify a number...

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

Mining And The Community

NERDDC

National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook

NERDDC