Practical Exercise: 1 (40 marks) Subject Risk assessment exercise on a typical long-distance conveyer for transporting newly mined coal away from the coal face Objective To gain basic experience with the risk assessment and risk reduction procedures as described in chapter 3 of the course manual and as required by EN ISO 14121 and AS 4024.1301 Relevance All machinery safety projects should be subjected to this type of procedure. Provides a simple practice routine. This example is typical, and it makes use of the Hazards Checklist from both of the above standards. B. The risk scoring system advocated by PILZ and by Proctor Machine Guarding C. an Excel spreadsheet format based on the software tool issued by Proctor and demonstrated during the training course. Starting Information: Suppose you are the designer for an underground conveyor installation that is to transport raw coal in lumped and crushed forms and all debris from a coal cutting area over a distance of more than 1000 meters to a large receiving bin. The conveyor is to be installed in a tunnel that has an adjacent walkway for people to access the coal face. The tunnel section has a 1 in 10 gradient from the input up to the receiving bin. The conveyor will be run at a height of 1.0 meters above ground, with the returning belt at 0.3 meters above ground. Crossover bridges or underpasses will be provided where necessary. No vehicle crossovers are needed. There will be an elevated section at the delivery end of the conveyor to discharge into the receiving bin for the elevator. The conveyor will be constructed as a woven steel mesh with rubber covering and will be tensioned by a hydraulic tensioning unit under automatic control. The conveyer has an indirect drive with a fluid coupling. The drive will be interlocked with the receiving hopper to avoid delivery when the hopper is full. Operations will be supervised from the area remote control panel. Assume the normal occupancy of the conveyor area is four people close enough for harm once per hour. In the general area, assume up to 10 people may be present once per hour.
1) You must perform a risk assessment by following the processes outlined in Chapter 3 paragraphs 3.3, 3.5, and 3.6. This assessment must include hazard identification, risk estimations, and risk reduction recommendations.
2) The given file, DME_M15_Assignment_RA_Blank.xls, contains a blank reporting table and a spreadsheet tool for risk assessment. Submit your RA findings on this file and save a copy of it with your initials.
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3) The PILZ scales for likelihood, consequence, exposure, and number of people as outlined in Chapter 3 will be used for the risk estimates. The “risk parameters” sheet displays the value tables.
Both consistency and methodology will receive points. Give the risk parameters your best guesses, although the numbers won’t matter much for grading. Expect to locate at least ten entry items, but you might find more. Ten excellent entries can get you the maximum number of points. Risk analysis of a coal mine’s underground conveyor You can get DME_M15_Assignment_RA_Blank from Moodle. Task specifics Marks 10%
5% Step 1: Start off by outlining the limitations of the system and the application environment you’ll be assuming. Essentially, this is only the conveyor and its drivers. Then, using the RA sheet’s checklist, list as many dangers as you can and provide a brief description of each one in the relevant input row. See, for instance, the entry line for danger 1.1.
Step 2: Write down the potential causes and effects of each potential hazard on the record page. Estimate the event’s chances and consequences now to arrive at the “initial assessment” that will be used if no risk mitigation strategies are implemented. For any hazard that, in your opinion, is not relevant, enter “N/A.” Please also include a value between 0 and 5 for your estimation of any asset loss as a result of the event, in addition to the human consequences. 0 indicates no loss, while 5 indicates total loss of the machinery and sustained output losses.
Step 3: At this point, think about the potential applications of the risk reduction techniques depicted in Figure 3.9 to each hazard individually and provide your proposals in the table.
Step 4: To acquire the revised risk score, update the risk score values in the “revised assessment” columns. Now list the tasks you need the design team to complete, such as creating notices or operating instructions. Any information you deem pertinent should go in the comments section.
The fifth step is to update the RA Summary sheet by copying over the hazards entries that need to be addressed.
The parts of a conveyor that are often shown in the above diagram are: In contrast to what is presented, the tensioning system in this assignment will employ hydraulics.
This image depicts a conventional coal mining conveyor that has been set up in a small tunnel.
DME_M15_Assignment_RA_Blank.xlsx Coal Conveyor Risk Assessment 194191