ngi-cranes-part 01

oasisInternational Training Center

Presents

CRANES

Types of cranes

Boom truck Jib crane Crawler Crane Ceiling Crane Tower Crane Gantry Crane Side Boom Hammer Crane …

Identification and CapacityThe manufacturer must issue a Test Certificate for every crane he produces, identifying it and specifying the Safe Working Load (SWL) which must be clearly marked on the Crane structure.

Safe Working Load

In large organisations which have their own system of plant identification it should relate to the Manufacturer’s Certificate.

IdentificationNumber

Crane operators must know how to use lifting charts

Crane operators must know how to use lifting charts

MaintenanceApart form Statutory Inspections, Cranes should be inspected regularly by the user’s own staff and preventative maintenance schedules followed. Records should be kept of these checks and of any work done, especially if it is in response to a Statutory Inspection requirement.

Safety MeasuresTo protect both the Operator and the Crane itself, a number of safety devices are incorporated in the design of the Crane and these include :

1)Over travel Switches To prevent the hook or sheave block frombeing raised right up to the cable drum, a robust limit switch should be fitted to the crab or upper sheave block. Checks of this limit switch should be included in routine inspections.

NO

2) Protection of Bare Conductors

Where bare pick-up conductors are used to carry the power supply they must be shielded form accidental contact particularly if near cabin access. Suitably worded notices, e.g. WARNING – BARE LIVE WIRES, should be posted on the walls or building structure. The power supply isolating switch posted on the walls or building structure. The power supply isolating switch should be provided with means for locking-off during maintenance work.

3) ControlsThe controls of Cranes, whether cabin, pendant or radio, should be clearly identified to prevent inadvertent operation. On Overhead Electric Travelling (OET) cranes with electric pendant controls the directions of travel should be unambiguously marked. Controls should be of the ‘Dead-Man’ type.

4) Load IndicatorsLoad Indicators are required to be fitted to jib cranes and can be used with

benefit on all cranes. There are two types :A) A load / radius indicator that shows the radius at which the crane is

working and the safe load at that radius. It must be clearly visible to the driver.

B) An automatic Safe Load Indicator that warns, either visually or audibly, that the load is approaching the maximum safe level or that it has exceeded that value.

5) Safety CatchesWherever practicable, crane hooks should be fitted with safety catches9 to prevent slings, chains, ropes, etc. from ‘jumping’ off the hook.

NO!

Safety Catches

NO!

Yes