Knuckle Boom cranes are especially developed for use on different types of offshore (support) vessels.

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Knuckle Boom cranes

The KenzFigee Knuckle boom crane appears similar to a standard offshore crane, except that the boom mechanism articulates at the 'knuckle' near the middle. This ensures that the crane is capable to control and lift the load in a more stable way, also during dynamic seagoing conditions, resulting in higher workability and subsequently safer operations.

Based on proven design, the KenzFigee Knuckle Boom crane is easy to customize in order to fit clients' requirements. This design has the main hoist rope running underneath the knuckle jib. With its ‘easy to re-reeve’ main boom lift, the hoist rope can be placed over the main boom to handle taller and heavier loads. In addition to this, the main hoist winch can be placed below the deck (also at a later stage), which facilitates deeper operations and better vessel stability. Because of its compact design the deck space utilization is less.


  • Extremely suitable and common on offshore vessels as less deck space is blocked by the crane
  • Boom length 18m to 45m
  • Capacity 50t - 300t
  • Supplied in accordance with all international standards
  • Certified by recognized authorities
  • Workability; long knuckle
  • Foldable knuckle for more clearance under crane in boom rest
  • In contrast to other Knuckle Boom cranes, these cranes can lift tall objects over the main boom
  • Almost no vertical hook displacement during folding of the knuckle
  • Different reeving options


FPSO / Drilling

Specifically for FSPO / drilling units we have developed designs to support continuous operation.
The typical loads, even in extreme sea state conditions.

Knuckle Boom (FPSO/ Drilling units) SWL [t] Radius [m]
Type Max Max.
KBF 3000 25 30
KBF 3500 35 35

other types of (Offshore Support) Vessels

Control over the load, most efficient way of operating, subsea including features to cross the splash zone. Active heave compensation, constant tension 3D active motion compensation specific.

Knuckle Boom

(OS Vessels)

SWL [t] Radius [m]
Type Max Max.
KBO 1800 10 20
KBO 2400 25 25
KBO 3000 50 30
KBO 3500 100 35
KBO 4300 200 40
Configuration Standard Options
Design code EN13852 API
Class DNV / LRS / BV / ABS / ClassNK
Drive Electric-Hydraulic Diesel-Hydraulic
Area classification Safe Area ATEX Zone 2 / Zone 1
Safety AOPS / MOPS
Winch features Man-riding
Constant tension
Auxiliary winch

2x Knuckle Boom

  • Client: Heerema Marine Contractors
  • Vessel: Aegir
  • SWL: 50 t & 200 t

2x Knuckle Boom

  • Client: POSH
  • Vessels: Mallard & Pintail
  • SWL: 120 t

Video testing activities knuckle boom crane at KenzFigee premises.


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