Ram luffing knuckle boom cranes – RL-K

The ram luffing knuckle boom crane series (RL-K) from Liebherr was developed especially for the oil and gas industry. The unique design of the knuckle boom reduces the working radius and increases the flexibility of the crane.
With the addition of a deep-sea winch and the active swell compensation system (Heavetronic), the RL-K can be used as a deep sea crane. Both are developments from Liebherr and fully integrated in the Litronic control system.

  • Deployment on a pipe laying service vessel (PLSV) in the South Atlantic by Brazil.

    Liebherr ram luffing knuckle boom crane RL-K 7500

    Deployment on a pipe laying service vessel (PLSV) in the South Atlantic by Brazil.

  • Deployment on a pipe laying service vessel (PLSV) in the South Atlantic by Brazil.

    Liebherr ram luffing knuckle boom crane RL-K 7500

    Deployment on a pipe laying service vessel (PLSV) in the South Atlantic by Brazil.

  • liebherr-oc-rlk-4200-knuckle-boom-crane-subsea-operation-1
    On the test stand at Liebherr MCCtec Rostock GmbH, Rostock (Germany).

    Liebherr ram luffing knuckle boom crane RL-K 4200

    On the test stand at Liebherr MCCtec Rostock GmbH, Rostock (Germany).

RL-K series

Specifications RL-K 4200 RL-K 7500
Tilting moment 4,200tm 7,500tm
Main lift capacity (max.) 100t 300t
Applications Pipe handling Deep sea operations

Equipment

The special feature of the knuckle boom's design is the mechanical knuckle transmission. It facilitates a minimum working radius of under 10 metres and on the RL-K 4200 permits almost complete extension of the boom to practically 180°.

Pipe handling basic element with pipe internal grabber and pipe external grabber

Pipe handling basic element with pipe internal grabber and pipe external grabber

Pipe handling basic element with pipe internal grabber and pipe external grabber

Liebherr has special equipment such as different pipe grabbers and load manipulators for handling pipes and lines in relation to oil and gas extraction systems.

The base unit of the pipe grabber system can be rotated and swivelled and can be enhanced with a pipe internal grabber or pipe external grabber.

With the pipe external grabber, it is possible to lift pipes with a diameter of up to 500 millimetres, up to six pipes simultaneously and an overall weight of 10 tonnes.

The pipe internal grabber features a telescopic function and enables handling of pipes with a maximum length of 23 metres and a diameter of up to 1,500 millimetres.

  • Equipment with camera possible
  • Certified explosion-protected version available
  • Fast and uncomplicated exchange of equipment
  • Complete integration in the Litronic control system

The Liebherr-developed deep sea winch makes it possible to work at sea depths of up to 3,600 metres. It features a special cable reel mechanism that facilitates low-wear winding and unwinding of the cable, which in turn prolongs the service life of the cable.

Downloads

Active heave compensation

Heavetronic is an Active Heave Compensation System specially developed by Liebherr for deep sea use. Heavetronic