Rigging Projects Risk Assessment

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Task Based Risk Assessment

    Task Based Risk Assessment
      To provide a clear understanding of the principles and purpose of
      Task Based Risk Assessment.

      To enable key personnel to develop the practical skills necessary to
      complete suitable and sufficient assessments in the workplace.

     Apply the concepts of hazard, risk and control to practical workplace situations.
     Formally record assessment of risks using BP Task Based Risk Assessment
     Develop control procedures to reduce risk and evaluate residual risk.
     Review risk assessment actions.

           Risk Assessment
           Regulation 3 of the Management of Health & Safety at
           Work Regulations 1992 makes this a legal requirement.

           It requires a suitable and sufficient Risk Assessment for
           significant risks.

    Task Based Risk Assessment
           Exercise 1

           Complete a Risk Assessment for crossing a public road.
           The assessment should be carried out under the following headings:

               How can I get Hurt         What would my           What will increase the   What can I do to
                                           injuries be            Likelihood that I will   Prevent being
                                                                         get hurt          hurt.

   Crossing a Public Road
     How can I get Hurt   What would my         What will increase the likelihood   What can I do to
                          Injuries be           that I will get hurt                prevent being hurt

     Hit by Vehicle       Killed                 Speed of vehicle                   Do not cross
                          Serious Injury e.g.    Type of vehicle                    Look and listen e.g.
     Trip on the Kerb                            State of mind when crossing        Green cross code
     Fall down a Hole     Minor Injury e.g.      Position of crossing e.g. bend,    Choose better location
                          Cuts, grazes           parked vehicles, badly lit etc.    e.g. clear view, zebra x-ing
                          Shock                  Type of road / Amount of traffic   Use subway
                                                 Weather conditions                 Use footbridge

      Task Based Risk Assessment

                   BUT WHICH PRESENTS A LOW RISK.


       Is the potential to cause Harm to People, Property or Environment

       Hazard Effect
         • Death or Injury

         • Environmental Impact

         • Damage to Property

         All result in a loss, either personal, or to

              profits, business, reputation, skills etc.

     Evaluating Hazard Effect
       • Number of persons involved or extent of injury
         likely to result
       • Severity of injury
       • Extent of environmental impact
       • Cost of damage or business loss which may
         Use the worst credible scenario as the basis for
           choosing hazard effect

         Decide upon a realistic rating

        Task Based Risk Assessment
         Exercise 3

         Choose an activity which is most familiar to you in your work.

         Identify the hazards without using the checklist and then using the checklist.



         No Checklist                          Using Checklist

         Hazard Checklist
        •    Chemicals                                •   Operation of Vehicles
        •    Asphyxiants                              •   Hand Tools
        •    Drowning                                 •   Stored Energy
        •    Biological Agents                        •   Pressure
        •    Confined Spaces                          •   Ignition Sources (including Static) / Fire
        •    Excavations                              •   Explosion
        •    Fall of Person from Height               •   Electricity
        •    Fall of Objects / Material from Height   •   Lighting
        •    Trip or Fall on same level               •   Contact With Hot/Cold Surface
        •    Manual Handling                          •   Noise
        •    Incorrect Posture                        •   Vibration
        •    Use of Machinery                         •   Radiation
        •    Mechanical Lifting                       •   Adverse Weather
        •    Uncontrolled Release to Environment      •   SIMOPs

          Hazard Checklist
           • Chemicals
                   – Corrosive, Toxic, Harmful, Irritant, Oxidising
           • Asphyxiants
                   – Nitrogen, Carbon Dioxide, Halon
           • Drowning
           • Biological Agents
                   – Laboratories, Sewers, Contaminated Water, Cooling
           • Confined Spaces
                   – Storage Tanks, Ducting, Main Separators, Voids, Sumps
           • Excavations

          Hazard Checklist continued
          • Fall of Person from Height
                   – Rigging, Suspended Cradles, Ladders, Scaffolds
          • Fall of Objects / Material from Height
                   – Tools, Debris, Equipment
          • Trip or Fall on same level
                   – Uneven/Slippery Surface, Poor Housekeeping
          • Manual Handling
                   – Lifting, Carrying, Pushing, Pulling
          • Incorrect Posture
                   – Confined Spaces, Poor Balance, Use of Computer

           Hazard Checklist continued
          • Use of Machinery
                   – Moving Parts, Dangerous Parts
          • Mechanical Lifting
                   – Cranes, Hoist
          • Operation of Vehicles
                   – Lift Trucks
          • Hand Tools
                   – Hammers, Bolsters, Drills, Chisels
          • Stored Energy
                   – Suspended Load, Hydraulic Systems
          • Pressure
                   – Compressed Air, High Pressure Steam, Pressurised Fluids
                     & Gases

        Hazard Checklist continued
         • Ignition Sources (including Static) / Fire
               – Grinding, Cutting, Drilling, Welding
         • Explosion
               – Chemical, Pressure
         • Electricity
               – Cabinets, Switchrooms, Transformers
         • Lighting
               – Intense, Poor
         • Contact With Hot/Cold Surface

         Hazard Checklist continued
          • Noise
                   Piling Rigs, Compressors, Pumps, Fans
          • Vibration
                   – Percussive Tools, Heavy Plant
          • Radiation
                   – Nucleonics, Gamma Rays, LSA Scale, Weld Flash
          • Adverse Weather
                   -- Ice/Snow, Rain, Sea Condition, High/Low wind
                   Uncontrolled Release to Environment
                   --Waste Disposal, Emissions/ Discharges
                   SIMOPS -- hazards arising from simultaneous operations


      Is a combination of the Hazard effect and the
      Probability that Harm to People, Property or
      Environment will actually occur

      What is Risk?
       • Hazard effect
             – No. of persons and extent of loss
                     Combined with
       • Probability
             – Chance that the hazard effect will

   How often the Hazard Effect is likely to occur, taking
   into account the frequency with which the task is
       Who?                   What?

                   Where?              Why?

                            When?                 How?

                                    How Long?            How Often?

                                          How Much?

                            Decide upon a realistic rating

     Control is the Reduction in the level of Risk
     by the Introduction of Safety Measures

       Hierarchy of Control
         •   Prohibit                               •Enclosure
              – No stacking over specified                 –Top on container,
                height                                     –Noise enclosure on Turbines/Pumps

              – No use of chlorine based bleach
              – No unauthorised personnel           •Reduced Exposure Times
                                                           –Job rotation, breaks, (needle guns)
              – No jewellry

         •   Substitute                             •Dilution
                                                           –Dispense dilute chemical, open a
              – Solvent based paints with water
                                                           window to remove fumes
              – Dusty powder with pastilles
                                                    •Extraction (Ventilation)
              – Electrical hand tools with
                                                           –Welding, Soldering, Grinding
                compressed air

                                                    •Personal Protective Equipment
         •   Segregate
                                                           –Gloves, Goggles, Safety Shoes, Helmet,
              – Barrier, Guard, Separate Storage           Safety Harness
                Areas, Physical Isolations (e.g..
                Spade, Lock off)
                                                    •Training/Procedures/Permit to
         •   Change Process                         Work/Isolation and Entry Certificate /
              – Automated Feed                      Maintenance Schedules etc.
              – Use of Sack Slitter

     Task Based Risk Assessment
      Exercise 6

      Selection of Control Measures

      For the following example you are asked to use the Hierarchy of Control to suggest a
      series of control measures which will reduce the risk to a minimum.

      Task Activity Example;

      A Mechanical technician is operating a bench grinder for sharpening a chisel.

      Hazard/Hazard Effect                    Controls             Residual Risk
                                                                   HE P R

       Recording Risk Assessment
       •    Area
       •    Persons at risk
       •    Activity
       •    Hazards
       •    Risk
       •    Control measures
       •    Actions/responsibility
       •    Assessed by
       •    Date
       •    Review date

        Reviewing Risk Assessment
       A review should be completed under the following
          • Periodically (depending on risk)

          • Following Significant Changes (ie No longer

          • Following an Accident/Incident

       Did you Consider;
       WHO? - Skills, Knowledge, Training, Experience, Competence
       WHAT? - Type of Work, Number of Hazards, History of Accidents
       WHERE? - Indoors or Outdoors, Above Ground, Below Ground,
         Ground Level, Open Area, Confined Space.
       WHY? - Breakdown, Routine, Essential
       WHEN? - Time of Day, Others Present, Supervision
       HOW? - Procedure, Instructions, Safe System of Work, Method
       HOW LONG? - Duration
       HOW OFTEN? - Continuous, Intermittent, Daily, Weekly, Monthly,
       HOW MUCH? - Quality of Substance, Energy, Weight, Volume

     Task Based Risk Assessment
      Exercise 4

      A Mechanical technician is operating a bench grinder for sharpening a chisel.

      1. How might this person be injured?

      2. What will affect the probability that such injuries will occur?

     Evaluation of Risk
      Hazrd Effect
      Personal Effect                Property Damage            Environmental Impact                  HE Rating
      Fatality                       Major Loss > £1M         Total loss of hydrocarbon                  A
                                                        Or Spill of HOCNS Cat “A” Chemical
      Likely          Permanent Significant Damage Loss    Significant loss of hydrocarbon               B
      Disability                £100k TO £1M               containment. Limited ability to
                                                         control. Extending outwith Platform
                                                        Or Spill of HOCNS Cat “B” Chemical
      Hospital Stay             Moderate damage Loss       Significant loss of hydrocarbon               C
                                £25k to £100k              containment. Contained within
                                                        Or Spill of HOCNS Cat “C” Chemical
      Lost Time Injury, Medical Minor Loss £5K to £25K       Minor Loss of hydrocarbon                   D
      Treatment,        Onshore                                      containment.
      Treatment by Doctor                               Or Spill of HOCNS Cat “D” Chemical
      Simple Offshore First Aid Loss < £5K                 Very slight loss of containment.              E
                                                        Or Spill of HOCNS Cat “E” Chemical


      Probability (P)

      Impact                                                                             P Rating
      Event likely to occur more than once per quarter                                   High (H)
      Event likely to occur at least once per year, but less than quarterly (probable)   Medium (M)
      Event likely to occur less than once per year (occasional)                         Low (L)

        Evaluation and Prioritisation of
        Risk/Residual Risk

               HE   P   R                              Control Actions
               A    H   15   Immediate action, task must not proceed, serious loss potential.
                B   H   14   Task may proceed only with additional controls in place to avoid
               C    H   13   serious loss
               A    M   12   Plan controls to reduce risk further. Assess priority and agree
                B   M   11   implementation targets within 7 days maximum
               C    M   10
               D    H    9
               A    L    8   Monitor procedures and controls to ensure risk is maintained low as
                B   L    7   reasonably practical. Take immediate action if standards are not met.
               C    L    6   Ensure additional controls implemented within one month
               D    M    5   Implement controls to reduce risk to lowest level reasonably
                E   H    4   practicable within three months
                E   M    3   Prepare plan to reduce Risk to lowest level reasonably practicable-
               D    L    2   Action within one year
                E   L    1   Monitor annually to ensure risk does not increase.

       Task Based Risk Assessment
      Exercise 5

      For the situations in Exercise 4 calculate the risk factor.

      Hazard                      Hazard Effect           Probability   Risk Factor
        (H)                            (HE)                   (P)         (1 - 15)

        Task Based Risk Assessment
          Exercise 7 - (Group Exercise)
          With reference to the attached case study you are asked to rewrite the words underlined in the report under
          the correct heading depending on whether you consider them to be a:-

                   Hazard                    Hazard Effect             Factors Affecting                 Controls

       Accident Case Study
        On 17.01.89, a violent reaction of magnesium oxide and hydrochloric acid resulted in a severe boilover and expulsion of materials
        from a reactor. The three employees running the reactor were sprayed with the material but were able to get to a nearby safety
        shower immediately. All three employees (plant engineer, senior operator and part-time engineer) had first aid type injuries with
        only one receiving medical analysis for lung irritation the following day. Only minor skin burns were apparent the next day.
        This incident was a result of testing a different raw material, The usual raw materials are magnesium hydroxide and hydrochloric
        The following steps were followed prior to the violent reaction:
        1.            350 gallons of water placed in the reactor.
        2.            Agitator was turned on.
        3.            850 gallons of hydrochloric acid was added.
        4.            14 bags of magnesium oxide were added within 15 minutes through the manway.
        At this stage the reactor boiled over, spewing hot hydrochloric acid into the plant area. The plant was evacuated due to the acid
        fumes. the electricity was then shut off to the area and the fumes were evacuated via general ventilation fans. The area was then
        washed down with water and drained to waste treatment.
        Additional Notes
        1.             The magnesium hydroxide reaction is done via slurry and thus the manway is closed. The addition of magnesium
        oxide is via bags which requires the manway to be open.
        2.           There were previous boilovers during the production of this material utilising the original raw materials but not through
        the manway. These boilovers flow to a scrubber overflow tank.
        3.           The reaction is extremely exothermic and the recipe for the slow addition of the magnesium hydroxide is based on
        temperature of the reaction.
        4.               Two other process change projects were under review at this time and they were receiving more scrutiny as this test
        was not considered to be a major variance from existing practices. (Although it was later determined that magnesium oxide will not
        react until it reaches a certain temperature (50°C), which is different from magnesium hydroxide which reacts as soon as it is
        5.            There was not a Process Change Approval Procedure in place at the time of the incident.
        6.            The employees were wearing protective gears, safety glasses and bump caps at the time of the incident.

       Task Based Risk Assessment
        Expected Response to Exercise 7
                                                                      FACTORS AFFECTING
                         HAZARD             HAZARD EFFECT             PROBABILITY             CONTROL
                   Hydrochloric Acid        First Aid Type Injuries Violent Reaction      Safety Shower

                   Hot Hydrochloric Acid Lung Irritation           Testing                Agitator was turned
                   Acid Fumes               Minor Skin Burns       Manway is open
                   Boilover and Expulsion                                                 Manway is closed
                                                                   Previous Boilovers
                                                                                         Scrubber Overflow
                                                                   Reaction is extremely Tank
                                                                                         Slow Addition
                                                                   Major variance
                                                                                         Process Change
                                                                                         Approval Procedure

                                                                                          Safety Glasses
                                                                                          Ventilation Fans

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