Resident Engineers - Shaft Safety Seminar old format · e-mail: [email protected] ....
23
D E P A R T M E N T DRIEFONTEIN GOLD MINE Association of Mine Resident Engineers SHAFT SAFETY SEMINAR SHAFT SAFETY SEMINAR POWER OUTAGE SIMULATION POWER OUTAGE SIMULATION 6 March 2008 GERRIE PIENAAR Manager OE(H)
Transcript of Resident Engineers - Shaft Safety Seminar old format · e-mail: [email protected] ....
1
D E P A R T M E N T DRIEFONTEIN GOLD MINE
Association of Mine Resident Engineers
SHAFT SAFETY SEMINARSHAFT SAFETY SEMINAR
POWER OUTAGE SIMULATION POWER OUTAGE SIMULATION
6 March 2008GERRIE PIENAAR
Manager OE(H)
2
● Driefontein GM - brief overview
● Simulation guidelines
● Risk Assessment “must haves”
● Control sheet
● Realtime results and prediction
● Risk classification
● Important information
o VRT
o C.O.P. Thermal Stress
o Second escapes
AMRE SHAFT SAFETY SEMINARAMRE SHAFT SAFETY SEMINAR
C O N T E N T C O N T E N T C O N T E N T
D E P A R T M E N T DRIEFONTEIN GOLD MINE
3
AMRE SHAFT SAFETY SEMINARAMRE SHAFT SAFETY SEMINAR
OVERVIEW – Driefontein GMOVERVIEW OVERVIEW –– Driefontein GMDriefontein GM
4
AMRE SHAFT SAFETY SEMINARAMRE SHAFT SAFETY SEMINAR
OVERVIEW – Driefontein GMOVERVIEW OVERVIEW –– Driefontein GMDriefontein GM
HISTORYHISTORY
5
AMRE SHAFT SAFETY SEMINARAMRE SHAFT SAFETY SEMINAR
OVERVIEW – Driefontein GMOVERVIEW OVERVIEW –– Driefontein GMDriefontein GM
● 17 679 people employed (including contractors)
● 6,7 million tons milled for 1.16 million oz pa at a grade of 5.1g/t
● 660 000 square metres stoped and 36 kilometres developed each year
● Mean rock breaking depth at 2 500 metres below surface
● Deepest point underground 3 545 metres (Hlanganani Shaft bottom)
● Deepest workings at 3 300 metres (Hlanganani Shaft)
● Mean underground temperature of 28ºC wetbulb
● Ithembalethu Shaft will be 4121 metres below surface
● Certified to ISO 14001 (Env. management), OSHAS18001 andISO9000 (Training & Development)
KEY STATISTICSKEY STATISTICS
6
Planning is Planning is ““KINGKING””
SIMULATIONSIMULATIONSIMULATION
Off week-end
Run essentials
Star
t-up
proc
edur
e
Com
ms
One control
Withdraw
32.5 / 37.0
Re-entry
Synchro
nise
start
time
7
Detail risk assessment requiredDetail risk assessment required
RISK ASSESSMENT – “Must Haves”RISK ASSESSMENT RISK ASSESSMENT –– ““Must HavesMust Haves””
Food and water supply
8
CONTROL SHEETSCONTROL SHEETSCONTROL SHEETS
Required for each working level and critical areaRequired for each working level and critical area
9
“REAL TIME” RESULTS““REAL TIMEREAL TIME”” RESULTSRESULTS
Temperature ClassificationWB = 32.5°CDB = 37.0°C
Projection for each working areaProjection for each working area
10
“REAL TIME” RESULTS““REAL TIMEREAL TIME”” RESULTSRESULTS
Worst case scenarioWorst case scenario
11
4 hrs Classification matrix 2 days+
Risk Classification MatrixRisk Classification MatrixRisk Classification Matrix
Base from worstcase scenario
Food (rat packs) and watermust be provided
Determine priority for evacuationDetermine priority for evacuation
12
REMEMBER !!! REMEMBER !!! REMEMBER !!!
Incorporate in RAIncorporate in RA
Required in risk assessmentto determine tolerance timesand ensure safety of workers
13
V.R.T.V.R.T.V.R.T.
Work from worst case scenarioWork from worst case scenario
14
HEAT STRESS C.O.P.HEAT STRESS C.O.P.HEAT STRESS C.O.P.
At start of operation
Dry-bulb temperature = 32°CWet-bulb temperature = 28°C
EHSI (emergency heat stress index) = (32 + 28)/2= 30°C
The recommended limit for an EHSI level of 30°C is 230 minutes (Table 1 on slide 16 and this includes travelling time, assuming environmental conditions remain constant.
At point of entry to area of work
Elapsed travelling time = 20 minutesAvailable operational time = 230 – total travelling time
= 230 – (20 x 2)= 190 minutes
In other words, if the environmental heat load remains constant following entry to the area of work, the available operational time is 190 minutes.
15
HEAT STRESS C.O.P.HEAT STRESS C.O.P.HEAT STRESS C.O.P.
Following entry to the area of work it was established that the environmental heat load had increased:
Dry-bulb temperature = 38°CWet-bulb temperature = 34°CEHSI = (38 + 34)/2
= 36°C
The recommended time for an EHSI level of 36°C is 90 minutes. However, travelling time must be taken into account and an equitable ‘penalty’ derived. Inasmuch as the respective EHSI levels and corresponding tolerance times constitute equivalent ‘doses’ (i.e. identical risks of <10–3 to reach rectal temperature of 39,5°C), the penalty could be expressed in terms of dose.
In the present example travelling time to the area of work amounted to 20 minutes. On the assumption that the return journey would also take 20 minutes under identical conditions, the dose from travelling can be estimated as follows:
Dose = Actuel exposure/Permissible exposure= Total travelling time/Permissible exposure= 40/230= 0,1739= 17 %
This implies that the available dose at the higher EHSI level of 36°C would have to be penalised by the dose incurred as a result of travelling to and from the area of work. This dose amounts to 17 % and, consequently, the available dose amounts to 83 % of the total permissible tolerance time, therefore:
Available operational time = Permissible tolerance time x 0,83= 90 x 0,83= 74,7 minutes = 75 minutes
16
HEAT STRESS C.O.P.HEAT STRESS C.O.P.HEAT STRESS C.O.P.
ESHI
TOLERANCE TIME (min)
EXPERIMENTALLY DETERMINED
RECOMMENDED LIMITBCG BENEFITMODERATE STRENUOUS
28 to 29.9 - No limit No limit
+30
30 227 230 230
31 200 200 180
32 174 175 140
33 150 150 110
34 128 130 85
35 108 110 60
36 91 90 40
37 75 70 25
38 61 60
No work
Ev acuate area
39 50 50
40 40 40
Maximum of 20 - 25 minutes
41 33 30
42 27 30
43 24 20
44 22 20
17
SECOND ESCAPESSECOND ESCAPESSECOND ESCAPES
Surface ShaftsSub Vertical ShaftsTertiary ShaftsVentilation Shafts
LEGEND
YA RONA SUB #
18 Lev
22 Lev
14 Lev
14 Lev
22 Lev
14 Lev
14 Lev14 Lev22 Lev
22 Lev
24 Lev24 Lev
34 Lev34 Lev 34 Lev34 Lev
42 Lev
42 Lev
42 Lev
30 Lev38 Lev
50 Lev
22 Lev
34 Lev : -27 83 BD
18 Lev : -19 46 BD
34 Lev : -26 87 BD
18 Lev : -18 27 BD
32 Lev : -24 90 BD
-1605 BD
-1590 BD
38 Lev : -27 38 BD
26 Lev : -22 44 BD
22 Lev : -20 04 BD
50 Lev : -34 40 BD
-258 9 BD
-158 9 BD
-210 5 BD-211 3 BD
42 Lev : -30 03 BD
50 Lev : -34 25 BD
50 Lev : -34 24 BD
-1260 BD
6 Lev : -892 BD
4 2 L e v
22 Lev : -17 16 BD
14 Lev
36 Lev
38 Lev
HLANGAN ANIHLANGANANI VENT #
YA RON A
24 Lev
HLANGANANI SUB #
ITHEMBALETHU SUB #
ITHEMBALETHU VENT #
MASAKHANE SUB #
MASAKHANE TERTIARY #
MASAKHANE
ITHEMBALETHU
PITSENG VENT #
PITSENG
BAMBASANANI TERTIARY #
BAMBASANANI SUB #
BAMBASANANI
KHOMANANI
THABELANG
RETHABILE VENT #
RETHABILE SUB #
RETHABILE SUB A #
RETHABILE
SECONDARY OUTLETS
Each shaft is equipped with service/walkways close to shaft area between levels – strategy at shaft and between shafts must be in place
18
STANDBY GENERATORSSTANDBY GENERATORSSTANDBY GENERATORS
USEFUL INFORMATION
Size = 3 mVA x 2
Power required during hoisting = 3 Mva
controlled
Hoisting speed = 5 m/s (half speed)
Diesel consumption = 1000 lt/hr
Time to switch = 60 min
Reaction time = 120 min before hoisting
USEFUL INFORMATION
Size = 3 mVA x 2
Power required during hoisting = 3 Mva
controlled
Hoisting speed = 5 m/s (half speed)
Diesel consumption = 1000 lt/hr
Time to switch = 60 min
Reaction time = 120 min before hoisting
NOTE:The above MUST be included in therisk assessment
19
SUMMARYSUMMARYSUMMARY
20
and ESKOM says : Light is not good and ESKOM says : Light is not good –– let there be darknesslet there be darkness
And in other news.......concerning the ongoing
power blackouts, ESKOMsays that
“The Light At The EndOf The Tunnel” has alsobeen switched off now.
From:Eskom Management
Is there HOPE !!!Is there HOPE !!!Is there HOPE !!!
21
Latest Technology from Latest Technology from ““EISHKOMEISHKOM””
“EISHKOM” Innovation ““EISHKOMEISHKOM”” Innovation Innovation
22
Need Help ................Need Help ................Need Help ................
EISHKOM EISHKOM ““HELP DESKHELP DESK””
23
ClosureClosureClosure
Wonder if they will ask
questions???
GERRIE PIENAARManager Occupational Environment (Hygiene)Driefontein Gold Mineint. 8216tel: +27 18 781 8216fax: +27 18 781 8206cell: +27 82 860 2820 or +27 73 210 8493e-mail: [email protected]
