Rubber tyred gantry crane

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Kuantan Port container yard with rubber-tyred gantry crane.
Rubber tyred gantry crane

A rubber tyred gantry crane (RTG crane) (also transtainer) is a mobile gantry crane used in intermodal operations to ground or stack containers. Inbound containers are stored for future pickup by drayage trucks, and outbound are stored for future loading on to vessels. RTGs typically straddle multiple lanes, with one lane reserved for container transfers.[citation needed] Advantages:its mobility gives a rubber tyred gantry crane wild appliance

Being mobile, RTGs are often powered by Diesel generator systems (gensets) of 100 to 600 kW. Due to the lack of an electrical grid to dump energy when containers are being lowered they often have large resistor packs to rapidly dissipate the energy of a lowering or decelerating container.[1]

Rubber tyre gantry cranes (RTGs) are available with spans of between five and eight containers wide (plus a truck lane) and with hoisting heights from 1 over 3 to 1 over 6 containers high. Supplied with Liebherr's eight rope reeving anti-sway system and drive systems, the Liebherr RTG delivers exceptional productivity and reliability in container stacking.

Liebherr rubber tyre gantry cranes demonstrate their technological advantage through increased productivity and a proven low cost per box move. The RTG has a rigid and stable steel structure allowing precise handling with smooth movements even at high speeds. The liebherr high quality standard achieved, with ease of maintenance results in minimum downtime, increasing throughput per RTG unit. Precise control using simultaneous drive motion removes the need for a headblock or side shift. Available in either eight or 16 wheel configuration with numerous productivity options from DGPS and auto steering to stack profiling and automation.[2]

Aside from the intermodal industry, RTGs also are extensively used in industry. Applications include erecting large unbalanced structures, assembling large manufacturing components, and positioning pipelines.

It has the following advantages:

  • Exceptional anti-sway performance
  • Accurate spreader positioning - no headblock - better visibility
  • No headblock, reduced tare weight
  • Increased productivity compared with alternative designs
  • Smooth gantry operation
  • Improved performance where high winds prevail.
  • Optimum design for automation
  • Low maintenance and spare part costs
  • Lower energy and fuel costs
  • Spreader sideshift eliminated due to simultaneous motion

Power options for RTGS[edit]

Traditional Dual Speed Diesel[edit]

Liebherr RTGs are supplied with a dual speed diesel engine as standard. Controlled by the Liebherr designed drive system, the engine switches to idle mode when full power is not required reducing fuel consumption. Significant savings on fuel is achievable when compared with traditional RTG power options.

Variable Speed[edit]

A variable speed engine delivers optimum load dependant power levels by reducing engine speed in accordance with demand. Liebherr’s drive system ensures precise control over the entire process resulting in further savings in fuel consumption.

Electric RTG[edit]

A full electric RTG is available from Liebherr, with many benefits. RTGs can be factory designed for electric operation or an E-RTG solution can be retro fitted. Power regeneration on the RTG to the grid also means that energy costs are further reduced. Options include a cable reeling drum or conductor bar system.

Electric RTGs can be fitted with a full diesel genset, auxiliary generator or connection for a portable generator to allow movement between the stacks.

Diesel Electric Hybrid[edit]

Fitted with an energy storage solution, this option offers substantial savings without any loss in productivity. Using stored power from the reserve when required, the reduced dependability on the diesel engine can deliver fuel savings of up to 30% dependent on operation.

Different kind of RTGs[edit]