critical load path by nasik

Engineering

Middle East CranesDriving Construction 2009

Tower Crane Safety - Martin Banasik MSc CEng MIMechE

Engineering

03/04/09© Copyright Allianz 2Dubai 2009

Engineering

Risk Management

Risk Consideration

The probability of the harm occurring

RISK = HAZARD x PROBABILITY

If it can happen, it will happen


Engineering

Risk Management

Risk Assessment

Suitable and sufficient- Erection stage (Installer)- Climbing stage (Installer/End User)- Use stage (End User)

Risk to employees at workRisk to others at work location

The risk assessment should identify the risks arising from or in connection with the work activity

The level of detail in a risk assessment should be proportionate to the risk


Engineering

Risk Management

Risk Assessment and Method Statement

Site access (obstructions, services, traffic management, work area, etc)Persons in the vicinity of lifting equipment (control of hazard zone)Confirmation of ground condition suitability (erecting cranes)Preparation of anchorage/crane baseCapacity and marking of lifting equipment (duty charts, ballast, etc)Planning of erection operation (erection sequence and working configuration)Management of the lifting operations

- Duties of the appointed person- Control of lifting operation- Safe system of work- Communication lines


Engineering

Risk Management

Risk Assessment Control Measures

To reduce the assessed risks to acceptable levels, using reasonable and practical means Suitable work equipment for the erection process Adequate equipment maintenance/repair and records Inspection by competent person Training for the work function

- Competent appointed person- Competent erection crew- Competent crane operator- Competent slinger/signaller

Provision of suitable and sufficient information and instruction Training of operators and supervisors


Engineering

Risk Management

Communication

Site induction processDocumented toolbox talksRisk Assessment up-dates communicatedMethod statement changes communicatedHealth & Safety up-dates communicatedEnsuring work functions are understood by all


Engineering

Inspection

Thorough Examination/Inspection

Inspection post installation and prior to first use at a new siteRegular inspection when in-serviceInspection post, repair, alteration or incident and prior to placing back into service

Place thorough examination in context Operational environment Duty UtilisationConsider defects and weaknessesRecommend actions to rectifyAdvise on Health & Safety improvements


Engineering

Inspection


Safety of persons operating equipment On the access ladder In the cab On the walkwaySafety of persons in the vicinity of equipment Uncontrolled loss of load Struck by moving equipmentAssessment of as seen condition


Engineering

Inspection


Security and adequacy of crane base (cast-in anchors, cruciform, travelling)Ballast adequacy and securityTower structural condition and fastener securitySlew assembly condition and gearing integrityJib and counter-jib security and structural conditionCounter-ballast adequacy and security‘A’ frame and stay structural conditionPivot joints and jib attachment integrity and securityHoisting mechanism integrity (drive, gearing, braking, coupling)Trolley mechanism integrity (drive, gearing, braking, coupling)Rope, termination, guard and sheave conditionHook block assembly integrity


Engineering

Inspection


Access ladder, platform, safety line condition and securityCab security and operator guarding integrityOperator functions and markingsCrane duty markingsElectrical cabling conditionElectrical enclosure security and suitability for operating environmentHoist limit functionsRated capacity indicator functionRated capacity limiter functionWind speed indicator functionAnti-collision system function


Engineering

Inspection


Critical Load Path Assessment of the equipment and

identification of the significant components and sub-assemblies which, if they were to fail would result in- Injury to persons- Structural instability- Uncontrolled loss of load


Engineering

Inspection


Safety Critical Components Where a single failure of any part of the component could inevitably lead to

- Injury to persons- Overload (indicating and limiting devices)- Instability (indicating and limiting devices)

- Wind- Moment

- Uncontrolled loss of load


Engineering

Inspection


Hidden Parts Age of the equipment/installation When were the items last exposed What component replacement history

is thereSupplementary testing NDE Functional Load Calibration


Engineering

Insurance

Contractors PlantOwned Plant• If there is a total loss

- Replace the property or pay for the loss or damage to the market value of the plant

• If there is a partial loss- Pay for the cost of repairing the plant up

to the amount that would be paid had there been a total loss

Hired In Plant• Cover the Insured’s legal liability for loss or damage and continuing hire charges resulting from this loss or damage under the hiring agreement


Engineering

Risk Reduction

When it goes wrong!

Accidents do happen Ensure that no-one gets hurtAccidents avoided by: Comprehensive planning Attention to detail Competent/Trained staff Good communication

Partnership!

critical load path by nasik

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