1–8T Pedestal Hydraulic Knuckle Boom Marine Deck Crane | Compact Slewing Crane

Product Specification

1–8T Pedestal Hydraulic Knuckle Boom Marine Deck Crane | Compact Slewing Crane

Product Overview

This pedestal-mounted hydraulic knuckle boom crane is intended for shipboard load handling where deck space, stowed envelope and flexible working radius are important. The articulated boom consists of a main boom and a knuckle jib, allowing the boom to fold into a relatively compact parking position and to position the hook through a wider range of boom geometries than a comparable straight-boom arrangement.

The reference range supplied for this page covers 1 to 8 t SWL configurations, working radii up to 25 m, hoisting speeds of 10–15 m/min and reference hoisting heights of 30–40 m. For crane procurement, SWL must always be tied to a defined radius and approved load chart. Vessel type, harbour or at-sea operating mode, ship motions, pedestal/foundation loads, hydraulic power arrangement, control philosophy and classification scope therefore need to be confirmed before the crane is treated as a final project configuration.

Quick Specifications

• Crane type: pedestal-mounted hydraulic knuckle boom deck crane → articulated boom geometry reduces the stowed footprint and improves radius flexibility on congested decks.

• Reference SWL range: 1 / 1.5 / 2 / 3 / 5 / 8 t → each SWL must be verified at a specified outreach; the supplied data are not a constant-capacity load chart.

• Reference working radius: 2–25 m → actual minimum and maximum outreach depend on boom geometry, hook reeving and the selected SWL curve.

• Slewing: up to 360° → continuous or mechanically/electrically limited slewing is to be confirmed by the final GA and rotary interface design.

• Hoisting speed: 10–15 m/min; reference hoisting height: 30–40 m → final values depend on reeving, winch selection, wire-rope length and project duty.

• Reference motor power: 11–75 kW → final hydraulic power unit rating and electrical supply are selected from the approved crane duty and simultaneous-motion requirement.

• Operating temperature: project-specific → the stated −40 °C to +50 °C range should only be specified when materials, hydraulic oil, seals, electrics and winterization/heat protection are designed for it.

• Corrosion protection: blast-cleaned steel, typically Sa 2½ preparation, followed by a project-approved marine coating system → coating type and total DFT should be stated in the purchase specification.

Knuckle Boom Design & Deck-Space Value

• The knuckle joint allows the jib to fold toward the main boom, reducing the parking envelope compared with many straight-boom cranes of similar outreach.

• Articulation provides an additional geometric degree of freedom for bringing the hook closer to the vessel structure or positioning a load around deck obstructions, subject to the approved operating envelope.

• A pedestal slewing arrangement can serve a broad deck area from one fixed foundation position; the final slewing sector must account for ship structure, masts, railings, cargo and prohibited zones.

Main Technical Parameters

Reference performance data supplied by the customer. These values are for preliminary model comparison; final SWL-versus-radius load charts, reeving and approved GA data govern procurement and operation.

Load Chart & Operating Duty

• SWL definition: state the allowable hook load at each operating radius; do not publish a single SWL independently of outreach when crane capacity changes with radius.

• Operating mode: confirm whether lifting is limited to harbour/sheltered-water operation, permitted within the ship at sea, or intended for load handling outside the ship in open-sea conditions.

• Vessel motion inputs: heel, trim, accelerations, wind criteria and sea-state limits must follow the selected class/flag design basis and the crane’s intended operating mode.

• Hoist system: confirm wire-rope diameter/construction, number of falls, hook block, drum capacity, maximum hoisting height and minimum retained wraps according to the selected winch design.

• Duty and fatigue: expected load spectrum, operating cycles and service category should be provided for structural, machinery and fatigue design rather than relying only on maximum SWL.

Structure

Pedestal / foundation interface | Slewing bearing and drive | Rotating column / machinery platform | Main boom | Knuckle jib | Hydraulic luffing and articulation cylinders | Hoisting winch, wire rope and hook block | Hydraulic manifold / HPU interface | Local control station | Boom stowage support as required

Hydraulic, Control & Safety Engineering

• Hydraulic luffing and knuckle cylinders should use load-holding / counterbalance arrangements appropriate to the approved circuit so the boom is controlled if pressure is lost or a hose fails.

• Hoisting machinery should include a brake and load-control arrangement sized for the approved SWL, reeving and dynamic duty; exact brake type and redundancy are to be confirmed by the applicable class rules.

• Overload/load-moment protection, hoist limit functions, slewing limits, emergency stop and emergency lowering/recovery functions should be selected according to crane duty and class requirements; they are not assumed as standard unless confirmed in the quotation.

• Local controls are normally required for commissioning and maintenance. Radio remote control, operator platform/cabin, anti-collision functions or camera/load display can be offered only when included in the project scope.

• Personnel lifting, rescue-boat handling, active heave compensation, constant tension or offshore subsea lifting are separate design duties and must not be inferred from this standard shipboard crane page.

Installation & Ship Interface

• The crane pedestal transfers vertical load, horizontal shear, overturning moment and torsion into the ship structure; foundation reactions should be issued for the shipyard/naval architect to design deck inserts, girders and local reinforcement.

• Pedestal weld details, foundation material, WPS/PQR, welder qualification and NDT scope should follow approved drawings and the selected class/shipyard requirements.

• The GA should reserve the slewing envelope, boom parking position, hook stowage, service access, hose/electric routing and safe maintenance clearances before the foundation is finalized.

• Electrical supply, starter/VFD arrangement where applicable, HPU location, tank capacity, cooling/heating requirement and hydraulic connection philosophy must be confirmed from the vessel power system and ambient conditions.

• For replacement projects, the existing foundation should not be assumed adequate solely because the new crane has a similar SWL; pedestal reactions and bolt/weld geometry must be checked against the new crane load case.

Marine Design & Engineering Advantages

• Compact folded geometry helps preserve usable deck area during non-operating periods and can simplify stowage where masts, bulwarks or deck machinery limit space.

• Two articulated boom sections provide more flexible hook positioning than a single rigid boom, which is useful for stores, service equipment and maintenance handling around shipboard obstructions.

• Pedestal slewing concentrates the crane/ship interface at one engineered foundation, enabling the shipyard to coordinate local reinforcement, cable/hose services and the protected slewing zone.

• Project-specific hydraulic tuning can provide smooth acceleration/deceleration and simultaneous-motion capability when included in the selected control package, reducing abrupt load movement during routine handling.

• The crane can be configured for different pedestal heights, control locations, coating systems and class requirements, but each option changes the engineering scope and should be confirmed before the GA is frozen.

Custom Attributes

Capacity: 1 / 1.5 / 2 / 3 / 5 / 8 t reference SWL → final capacity must be stated against the approved working radius.

Working Radius: 2–25 m reference range → final minimum/maximum radius and SWL curve to be confirmed by model.

Boom Type: Hydraulic knuckle boom → articulated jib supports compact stowage and flexible hook positioning.

Slewing: Up to 360° → continuous versus limited slewing to be confirmed; do not assume unrestricted rotation from “0–360°” alone.

Power: 11–75 kW reference motor range → final HPU/electric motor power depends on load, speed, hydraulic pressure/flow and simultaneous motions.

Temperature: −40 °C to +50 °C optional project range → requires confirmed low/high-temperature materials, fluids, seals and electrical components.

Surface Preparation: Sa 2½ reference preparation → coating system, stripe coats and total dry-film thickness to follow vessel/project paint specification.

Certification: Class approval and product certification according to project requirement → survey scope, design standard, load test and documentation must be agreed before order.

How It Works

Start hydraulic power → Luff main boom → Articulate knuckle jib to set hook radius → Slew the upper structure within the permitted sector → Hoist or lower the load within the approved load chart → Return boom and hook to the designated stowage position

Applications

Shipboard stores and provision handling | Deck maintenance equipment handling | General service lifting within approved load chart | Fishing and aquaculture vessel deck service | Workboats and coastal/service vessels | Newbuilding and replacement marine deck-crane projects

Classification, Testing & Documentation

For applicable SOLAS ships, onboard lifting appliances are now covered by SOLAS Regulation II-1/3-13, effective from 1 January 2026, with associated IMO guidance for design/construction/installation, testing, thorough examination, operation, inspection and maintenance. The selected classification society and flag Administration should therefore be identified at the inquiry stage so that design approval, product certification, survey and documentation are included in the quotation scope.

Typical project documentation may include approved GA and load chart, pedestal/foundation reaction data, hydraulic and electrical diagrams, material certificates, welding/NDT records, factory test records, class product certificate where ordered, load-test/thorough-examination documentation as applicable, and operation/maintenance manuals.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate — available according to project requirement and applicable class/flag approval scope; not all certificates are supplied by default.

Selection & Inquiry Guide

Step 1: Define the lifting duty: vessel type, cargo/service task, harbour or at-sea operation, required SWL at each working radius, minimum/maximum outreach and hoisting height.

Step 2: Provide the vessel design basis: class society, flag, operating area, required heel/trim or motion inputs, wind/sea-state limits, ambient temperature and whether the crane ever lifts outside the ship at sea.

Step 3: Confirm the hoisting arrangement: hook block, rope construction/diameter, number of falls, drum capacity, required lifting speed and whether simultaneous hoist/luff/slew motions are required.

Step 4: Confirm the hydraulic/electrical package: vessel voltage/frequency, available power, integrated or separate HPU, local/remote control, operator platform/cabin and any required monitoring or anti-collision functions.

Step 5: Provide installation data: deck arrangement, pedestal height, available slewing/stowage envelope, foundation structure, existing crane information for replacement projects, and shipyard drawing format.

Step 6: Confirm coating system, class certificate/survey scope, quantity, delivery destination and required delivery date; provide GA drawings or reference photos when available.

Drawing & Photos

FAQ

Q1: Does the 8 t model have 8 t SWL at the full 25 m working radius?

A1: Not from the data currently available. The supplied table lists 8 t and a 2–25 m reference radius range, but it does not provide an SWL-versus-radius curve. Final capacity at each outreach must be confirmed by the approved load chart before the website or quotation states a specific 8 t at 25 m rating.

Q2: Can this marine knuckle boom crane be used as an offshore/platform crane?

A2: Not automatically. A shipboard crane and an offshore crane have different design bases for dynamic loading, environmental conditions and certification. Open-sea lifting outside the ship or use on offshore units/platforms must be specified at inquiry stage and designed/certified to the applicable offshore standard and class rules.

Q3: What information is most important for a class-approved quotation?

A3: Provide SWL at radius, operating mode, vessel type, class/flag, motion/heel/trim design basis, hoisting height, rope/reeving, slewing requirement, control and power supply, pedestal/foundation arrangement, coating system, certificate scope and delivery schedule.

Drawing of Pedestal Hydraulic Knuckle Boom Slewing Crane Ship Deck Equipment