OMNI 89 PROP RISK ASSESSMENT

Transcription

1 OMNI 89 PROP RISK ASSESSMENT 13/08/2012 ELBROC RA OMNI 89 PROP Page 1 of 10

2 CONTENTS Introduction 3 1. Product Description 3 2. Design Criteria 3 3. Risk Assessment Team 3 4. Objectives 4 5. Hazard Classification 4 Risk matrix 5 FACTOR/INDEX TABLE 5 6. Conclusion 6 Appendix 1 Tabulated Hazards and Control Measures 7-8 Appendix 2 Installation and Removal Procedure /08/2012 ELBROC RA OMNI 89 PROP Page 2 of 10

3 Introduction This document has been compiled as a risk assessment for the Omni 89 Prop designed and manufactured by ELBROC MINING PRODUCTS (PTY) LTD. This assessment pre-empts any potential application and trials that will be conducted underground. A comprehensive assessment will be carried out in accordance with the guidelines (QSP 111 Issue 1) The aim of this assessment is to identify the potential hazards associated with the use of these temporary support units in underground stoping operations and to list control measures to eliminate or reduce that potential. 1. Product Description The manufacturers of the Omni 89 Prop have developed the unit to perform in accordance with the COMRO guidelines for rock-burst and rock-fall conditions. The Omni 89 prop is a hydraulic prestressed mine prop constructed of steel. The primary purpose of this prop is to allow it to be prestressed to generate an active support resistance in an underground environment where such needs are identified by the mine. 2. Design Criteria The Omni 89 Prop is designed as a permanent support. 1. Pre-stressed to a minimum of 100kN 2. Controlled yielding from 100mm to 600mm depending on the length 3. Slow yielding load of between 170kN 200kN 4. Dynamic yielding load of between 250kN 320kN 5. Stopping widths of 0.9 meters to 1.8 meters. 3. Risk Assessment Team The team that compiled this provisional assessment consisted of: Trevor Clements Director Operations Groundwork Consulting 13/08/2012 ELBROC RA OMNI 89 PROP Page 3 of 10

4 4. Objectives In order to effectively identify the hazards associated with this product, a process as set out below facilitates a logical approach to formulating the risk indices. 1. Utilize a task procedure for installing and transporting the prop to identify probable hazards. 2. Apply a risk rating for each hazard. 3. List preventative measures. All the above are tabulated in Appendix Hazard Classification The following definitions are appropriate to this risk assessment and will be referred to in this document: HAZARD RISK SEVERITY PROBABILITY CONSEQUENCE -something that has potential to cause harm. -the likelihood that harm from a particular hazard will occur. -extent of the risk associated with the harm that a person might suffer as well as the number of persons likely to be harmed. -the chance that a person or persons will be harmed during the exposure period. -the degree of harm; the potential severity of injuries. The matrix below has been adopted from the Anglogold policy and procedure (QSP 111 Issue 1 dated ) and appropriately incorporated into the risk rating of this product. Allocating a value for the consequence and probability from the index column and row does the process of attaching the risk. 13/08/2012 ELBROC RA OMNI 89 PROP Page 4 of 10

5 Probability Expected result Quite possible Unusual but possible Remotely possible Very unlikely Practically impossible Consequence Index Catastrophic 1 Disaster (few 2 fatalities) Very serious 3 (single fatal) Serious (serious 4 injury) Important 5 (temporary disability) Of concern (minor 6 injury) No incident 7 Near miss Consequences FACTOR INDEX 1. Catastrophic (many fatalities) 2. Disaster (a few fatalities). 3. Very serious (one fatality). 4. Serious (serious injury). 5. Important (temporary disability). 6. Of concern (minor injury). 7. No incident 8. Near miss Probability Is the most likely and expected result if event occurs. 2. Quite possible (50/50). 3. Unusual but possible. 4. Only remotely possible (has happened somewhere). 5. Conceivable but very unlikely (hasn t happened yet). 6. Practically impossible (one in a million) /08/2012 ELBROC RA OMNI 89 PROP Page 5 of 10

6 6. Conclusion Primary hazards associated with the direct use of these products within the designed specifications and controls will be minimized if the correct installation and transport procedures are applied. This provisional risk assessment is restricted to the application of these products for underground permanent stope support only. 13/08/2012 ELBROC RA OMNI 89 PROP Page 6 of 10

7 APPENDIX 1 Tabulated Hazards and Control Measures ELBROC Omni 89 Prop PROCESS ACTIVITY HAZARD CONS PROB RISK PREVENTATIVE MEASURES Installation Making work and support Falls of ground resulting in injuries Employ mine standard / procedure for barring down the area safe to persons hanging wall and creating a stable footwall Determining and installing the prop in accordance to the mine standard Prop support to be positioned at right angles to the dip of the strata Decrease in areal coverage - increased area of possible instability (FOG) Uneven load distribution on prop support and increased risk of being dislodged by mining operations Demarcation of installation pattern Training on installation of support Correct sizing of the unit for the applicable stope width Undersized units would lead to ineffective support resistance and possible dislodging resulting in hanging wall collapses and injuries to persons Order the correct size of the unit for the relevant working place. Positioning the sized prop support in place Injury to extended bodily limbs and toppling of the prop before pre-stressing has taken place Wear protective clothing and ensure that hands are not sited between the temporary prop and hanging- or footwall Pre-stressing of Prop Falls of ground resulting in injuries to persons Positioning when pre-stressing of prop 3 to 5 meters away under permanent support 13/08/2012 ELBROC RA OMNI 89 PROP Page 7 of 10

8 ELBROC Omni 89 Prop PROCESS ACTIVITY HAZARD CONS PROB RISK PREVENTATIVE MEASURES Loading - Stacking of props in Surface store Toppling of bundles thereby creating obstructions and injuries to passers by. Do not stack more than two bundles on top of one another Ensure correct placement in store to prevent obstructions Off loading from transport vehicle Bundles falling off and injuring persons Make use of fork lift and /or crane operations Ensure correct procedural training for operators. Stacking in material car If not stacked properly, the units may dislodge and disrupt rolling stock Pack units flat in material cars Transport In Stope To be secured on both ends to the mono winch rope Physical transport Prevent damage of props by dragging Bodily injuries due to weight of the unit Apply mine standard for mono rope procedures for securing objects Ensure that two persons carry the unit simultaneously Make use of two carrying straps where provided on the unit. 13/08/2012 ELBROC RA OMNI 89 PROP Page 8 of 10

9 APPENDIX 2 Installation and Removal Procedure TOPIC Entry examination Make safe of stope face according to entry examination standard procedure Ensure all required PPE are used: Overall Gumboots Hard hat Gloves Goggles Ear plugs Temporary support Install temporary support as per mine standard procedure Marking of support lines Marking of dip and strike lines on the Hanging wall to indicate where props should be installed as per Rock Engineering recommendations Tools and equipment Ensure that correct tools and equipment are available for the task and in working order Air and water hoses, adequate air and water supplies and air and water hoses clean from debris Stope-width measuring device Pump with the desired pressure setting to achieve the required pre-load The hose is fitted with filler control valve and setting pistol The complete Omni 89 prop code for the required stoping width and headboard OCCUPATION Miner and Team Leader Stope Team Miner and Team Leader Stope Team 13/08/2012 ELBROC RA OMNI 89 PROP Page 9 of 10

10 Installation procedure Ensure footwall is clean and solid Select most suitable spot on the hanging and footwall, place the prop in position with the filler valve facing away from the face Install prop at right angels to the dip Wash filler valve using water from setting pistol Place the setting pistol coupler onto the filler portion of the valve and slide into position Fit the headboard (if required) with the barricade hook towards the face Hold the prop in position and operate the filler pistol control valve to extend the prop, ensuring that it makes contact with the selected position on the hanging wall. Once contact with the hanging wall has been established stop pumping immediately Position yourself 3 to 5 meters away under permanent support and pressurize the prop until the desired load has been reached Remove filler pistol control valve after installation Start new installation Points to be noted Never install a prop with a damaged filler valve as this may result in the loss of internal pressure Always ensure that installations are done with sufficient ram travel (to mine standard) to avoid full closure Props must always be installed 90 degrees to the hanging wall. Ensure that air and water hoses are clean before connecting up to the pump unit Ensure that high pressure hoses, filler control valves and setting pistols are in good condition and correctly connected Open the water supply to the pump unit and then the air supply After use close the air supply first and then the water supply Stope Team Miner, team Leader and Stope Team 13/08/2012 ELBROC RA OMNI 89 PROP Page 10 of 10