Hydraulic Knuckle Telescopic Marine Crane | Compact Deck Crane for Limited Deck

Product Specification

Hydraulic Knuckle Telescopic Marine Crane | Compact Deck Crane for Limited Deck Space

Product Overview

This hydraulic knuckle telescopic marine crane combines an articulated knuckle boom with telescopic extension to provide useful outreach while keeping the crane envelope compact for vessels with restricted deck space. The boom geometry allows the hook position to be brought closer to the crane pedestal than a straight telescopic boom of similar reach, while the telescopic section increases working radius without requiring a long fixed boom to remain over the deck.

The supplied capacity range is 10 to 100 kN with stated working-radius / outreach ranges up to 25 m and hoisting heights up to 40 m. For engineering selection, the crane must be matched to the approved load chart, vessel heel and trim condition, deck foundation loads, hydraulic/electrical supply, stowed envelope, hook path, and classification requirement. This page treats the product as a shipboard marine crane. Offshore open-sea lifting, personnel lifting, subsea handling, or motion-compensated service must only be stated when those duties are specifically designed, documented, and certified.

Quick Specifications

• Boom arrangement: Hydraulic knuckle boom + telescopic extension → compact stowage concept with flexible hook positioning and increased working reach.

• Supplied load range: 10–100 kN → exact SWL at each working radius must follow the approved crane load chart; the supplied summary table alone does not prove constant capacity through the full radius range.

• Working radius / outreach data: 5–25 m depending on model → the source gives ranges rather than a single maximum outreach, so final minimum/maximum radii require GA and load-chart confirmation.

• Hoisting speed: 15 m/min for most listed models → 15 kN row contains corrupted source data and is marked to be confirmed instead of being guessed.

• Slewing: 0–360° stated → continuous rotation, limited 360° rotation, slip-ring arrangement, and allowable slewing sector must be confirmed by the project drawing.

• Design temperature: -40°C to +50°C stated → low-temperature steel, hydraulic oil, seals, hoses, heaters, electrical equipment, and class design temperature must be matched to the vessel specification.

• Surface preparation: Sa 2½ blast cleaning + three-coat epoxy system stated → final coating system, total dry-film thickness, topcoat, colour, and repair procedure should follow the owner/shipyard paint specification.

• Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA and other class scope can be arranged according to project requirement and subject to class approval.

Main Technical Parameters

For Reference Only

Load, Outreach & Vessel-Motion Selection

• Crane capacity is not selected by nominal kN value alone. Confirm the SWL at the required radius and whether the load rating changes with boom extension, knuckle angle, slewing sector, vessel heel/trim, or operating condition.

• The supplied radius values are ranges. The final crane GA should define minimum radius, maximum radius, boom geometry, hook path, dead zone around the pedestal, and clearance from masts, rails, hatches, piping, and other deck equipment.

• Shipboard crane design should include the vessel operating condition specified by the owner/class. Heel and trim limits, dynamic factors, wind condition, ship motion, and offboard/onboard load handling basis should be stated before design approval.

• A shipboard crane for harbour or general marine service is not automatically an offshore crane. Open-sea offshore lifting requires a dedicated offshore design basis and certification, including the applicable dynamic/environmental loading and safety system requirements.

• The crane foundation and vessel deck reinforcement must be checked using pedestal reactions / foundation loads from the approved crane design. Crane supply data alone should not be used as a substitute for ship structural approval.

Compact Boom & Deck Integration

• Knuckle articulation allows the boom to fold into a shorter stowed geometry and improves access to loads close to the crane pedestal compared with a long straight boom arrangement.

• Telescopic extension provides additional working radius after the main boom and knuckle geometry have positioned the boom, allowing a broader working envelope without permanently occupying the full outreach on deck.

• For limited-deck-space projects, the stowed height, stowed width, tail swing, pedestal diameter, service access, hook stowage, hydraulic hose routing, and collision envelope should be checked on the vessel GA before production.

• Whether the selected crane is fully foldable within the vessel deck envelope should be confirmed from the final GA drawing; the phrase “full knuckle” in the source description is not sufficient to establish the exact stowed configuration.

Hydraulic, Control & Safety Design

The crane is hydraulically operated, but the final power and control architecture was not supplied. For quotation and class review, confirm whether the project requires a self-contained electro-hydraulic power pack or an external HPU, together with operating pressure, pump flow, electric motor supply, control voltage, hydraulic oil specification, and cold-start arrangement.

• Load-limiting / overload-protection logic, emergency stop, winch brake, cylinder holding or counterbalance valves, limit switches, alarms, and motion interlocks should be defined according to the selected class rule and crane duty.

• Control station arrangement may be local, pedestal-mounted, radio remote, cabin, or project-specific; the required operator position and visibility must be confirmed before design freeze.

• Simultaneous motions, variable / proportional speed control, emergency lowering, manual recovery, redundancy, and fail-safe functions are project-dependent and should not be advertised as standard unless included in the approved design.

• Personnel lifting, rescue-boat handling, subsea lifting, active heave compensation, constant tension, AOPS/MOPS, ATEX/Ex requirements, or special naval duty are separate design scope and require explicit confirmation.

Selection & Inquiry Guide

Step 1: Define the lifting duty: cargo / stores / hose / service handling, onboard or offboard lifting, required SWL, minimum and maximum working radius, hoisting height, lifting speed, and expected operating frequency.

Step 2: Provide vessel type, installation position, deck GA, allowable stowed envelope, nearby obstructions, required slewing sector, heel / trim condition, and whether operation is harbour, sheltered-water, at-sea shipboard, or offshore open-sea lifting.

Step 3: Confirm the approved load chart basis, hook / block arrangement, wire rope specification, winch reeving, boom extension sequence, and whether the crane must remain operational in any restricted boom configuration.

Step 4: Confirm hydraulic and electrical supply: self-contained or external HPU, system pressure and flow, motor power, voltage/frequency, control voltage, ambient temperature, heating requirement, and emergency power/recovery philosophy.

Step 5: Confirm classification society, SOLAS applicability, flag requirement, material certificates, welding/NDT scope, proof/load test, FAT/SAT, commissioning, marking, manuals, and loose-gear certification.

Step 6: Provide quantity, surface coating specification, colour, delivery destination, required delivery time, lifting/transport restrictions, installation method, and any existing crane drawing or replacement interface data.

Structure

Pedestal / foundation interface | Slewing bearing and drive | Main boom | Knuckle boom | Telescopic boom section(s) | Luffing and knuckle cylinders | Telescopic cylinder(s) | Hoisting winch | Wire rope and sheaves | Hook block | Hydraulic power / valve system | Control and safety system

Engineering & Quality Advantages

• Compact knuckle-and-telescope geometry is particularly useful where deck footprint and stowed envelope are more restrictive than maximum lifting moment alone.

• The working envelope can be tailored through main-boom luffing, knuckle articulation, and telescopic extension, allowing the hook to reach both close-in and extended positions when supported by the approved load chart.

• For marine service, design quality depends on more than structural strength: hydraulic sealing, hose routing, corrosion protection, low-temperature compatibility, drainage, maintainability, electrical enclosure protection, and safe access for inspection all need to be considered.

• Pedestal reactions and local vessel structure should be reviewed together. Foundation bolts / welds, deck insert plate, supporting stools or girders, and local reinforcement are part of the ship integration scope rather than assumptions to be made from a catalogue crane.

• Fabrication inspection, material traceability, welding procedure qualification, welder qualification, NDT, functional testing, proof/load testing, and commissioning should follow the agreed class and purchase specification.

Custom Attributes

• Crane Type: Hydraulic knuckle telescopic marine crane → articulated boom plus telescope for compact deck integration and variable reach.

• Capacity Range: 10–100 kN in supplied data → final SWL terminology and load chart must be confirmed before publication as an approved rating.

• Working Radius / Outreach: 5–25 m depending on model → values are source ranges, not a single maximum-outreach rating.

• Hoisting Height: 30–40 m → confirm whether stated value is hook travel / lifting height and whether it changes with reeving.

• Slewing: 0–360° stated → continuous vs limited rotation and slip-ring requirement to be confirmed.

• Operating Temperature: -40°C to +50°C stated → component/material suitability must be matched to the approved project design temperature.

• Surface Treatment: Sa 2½ blast cleaning + three-coat epoxy system stated → final DFT, topcoat and colour according to shipyard / owner coating specification.

• Classification: CCS / NK / BV / ABS / DNV / LR / KR / IRS / RS / RINA / CRS → available according to project requirement and subject to class approval and inspection scope.

How It Works

Hydraulic power is supplied to the crane → Slewing drive positions the pedestal / boom toward the load → Main boom luffs to establish working angle → Knuckle boom folds or opens to control hook position → Telescopic section extends or retracts to reach the required radius → Hoisting winch raises or lowers the load within the approved load chart → Crane returns to the defined stowed position after operation

Applications

Workboats | Tugboats | Fishing and aquaculture vessels | Dredgers and multicats | Research and survey vessels | Cargo and service vessels | Provision and stores handling | Hose / equipment handling | Compact deck lifting stations | Offshore support service only when the crane is specifically engineered and certified for offshore open-sea lifting

Certifications, SOLAS & Class Considerations

For applicable SOLAS vessels, onboard lifting appliances are subject to SOLAS Regulation II-1/3-13, in force from 1 January 2026, together with the associated lifting-appliance guidelines in MSC.1/Circ.1663. The applicable design and certification standard depends on the crane’s intended use, vessel class, flag requirements, and whether the duty is shipboard or offshore.

Classification approval, product certification, material certificates, fabrication inspection, load testing, thorough examination, and commissioning documentation can be arranged according to the agreed project scope and are subject to the selected classification society’s approval procedure.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate — available according to project requirement and subject to class approval.

Drawing & Photos

FAQ

Q1: Why is a knuckle telescopic crane suitable for limited deck space?

A1: The knuckle joint helps shorten the stowed envelope and improves close-in hook positioning, while the telescopic section provides additional reach when required. Final suitability still depends on the actual folded dimensions, tail swing, pedestal footprint, hook stowage, and vessel clearance drawing.

Q2: Can the 10–100 kN values be used as constant SWL over the full listed outreach range?

A2: Not from the supplied summary table alone. Crane capacity must be confirmed on the approved load chart against working radius, boom configuration, vessel condition, and any restricted slewing sector. The website should not state constant SWL unless the approved crane design confirms it.

Q3: Can this crane be supplied for offshore lifting or personnel lifting?

A3: Only when those duties are defined at inquiry stage and the crane is designed, equipped, tested, and certified to the applicable offshore or personnel-lifting requirements. A standard shipboard marine-crane configuration should not be presented as an offshore crane by default.

Drawing of Hydraulic Full Knuckle Telescopic Boom Crane For Limit Deck Space Ship Deck Equipment