Resident Engineers - Shaft Safety Seminar old e-mail: @goldfields.co.za . Title: Resident

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Transcript of Resident Engineers - Shaft Safety Seminar old e-mail: @goldfields.co.za . Title: Resident

  • 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 2008 GERRIE 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 and ISO9000 (Training & Development)

    KEY STATISTICSKEY STATISTICS

  • 6

    Planning is Planning is ““KINGKING””

    SIMULATIONSIMULATIONSIMULATION

    Off week-end

    Run essentials

    St ar

    t-u p

    pr oc

    ed ur

    e

    C om

    m s

    One control

    W ithdraw

    32.5 / 37.0

    Re -en

    try

    Sy nc

    hr on

    ise

    sta rt

    tim e

  • 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 Classification WB = 32.5°C DB = 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 worst case scenario

    Food (rat packs) and water must be provided

    Determine priority for evacuationDetermine priority for evacuation

  • 12

    REMEMBER !!! REMEMBER !!! REMEMBER !!!

    Incorporate in RAIncorporate in RA

    Required in risk assessment to determine tolerance times and 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°C Wet-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 minutes Available 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°C Wet-bulb temperature = 34°C EHSI = (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

  • 16

    HEAT STRESS C.O.P.HEAT STRESS C.O.P.HEAT STRESS C.O.P.

    ESHI

    TOLERANCE TIME (min)

    EXPERIMENTALLY DETERMINED

    RECOMMENDED LIMIT BCG 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 Shafts Sub Vertical Shafts Tertiary Shafts Ventilation Shafts

    LEGEND

    YA RONA SUB #

    18 Lev

    22 Lev

    14 Lev

    14 Lev

    22 Lev

    14 Le v

    14 Lev 14 Lev 22 Lev

    22 Lev

    24 Lev 24 Lev

    34 Lev34 Lev 34 Lev 34 Lev

    42 Lev

    42 Lev

    42 Lev

    30 Lev 38 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 ANI HLANGANAN I VENT #

    YA RON A

    24 Lev

    HLANGANAN I SUB #

    ITHEMBALETHU SUB #

    ITHEMBALETHU VENT #

    MASAKHANE SUB #

    MASAKHANE TERTIARY #

    MASAKHANE

    ITHEMBALETHU

    PITSEN G VENT #

    PITSENG

    BAMBASANANI TERTIARY #

    BAMBASANAN I SUB #

    BAMBASANANI

    KHOMANANI

    THABELANG

    RETHABILE VENT #

    RETHABILE SUB #

    RETHABIL E 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 the risk 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, ESKOM says that

    “The Light At The End Of The Tunnel” has also been 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 PIENAAR Manager Occupational Environment (Hygiene) Driefontein Gold Mine int. 8216 tel: +27 18 781 8216 fax: +27 18 781 8206 cell: +27 82 860 2820 or +27 73 210 8493 e-mail: Gerrie.Pienaar@goldfields.co.za

    mailto:Gerrie.Pienaar@goldfields.co.za