DNS60 Kingpost Offshore Deck Crane (also referenced as 60DNS-120-2.5 / NOV 60DNS 120-2.5)
National Oilwell Varco DNS60 Kingpost Offshore Deck Crane (also referenced as 60DNS-120-2.5 / NOV 60DNS 120-2.5) — Offshore kingpost lattice boom deck crane; cargo and provision handling on supply vessels, platforms, and offshore installations.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Annual visual and NDT inspection of all structural members, boom sections, and pedestal welds for cracks, corrosion, and deformation in accordance with API 2C and DNV-ST-0378
Load testing (functional test at 110% SWL and proof load at 125% SWL) of all hoist, slew, and luffing motions as required by classification society rules (DNV, ABS, BV, LR)
Inspection and greasing of slew ring (swing bearing) gear and raceway; check for backlash, wear, and abnormal contact patterns; replace as per manufacturer's interval
Hydraulic system check: oil analysis, filter replacement, inspection of hoses, cylinders, seals, and accumulator pre-charge pressures; verify no external leaks
Wire rope and sheave inspection: measure rope diameter, check for broken wires, kinks, corrosion, and drum spooling alignment; verify sheave groove wear and reeving condition
Overload protection and safety device testing: calibration and function test of load moment indicator (LMI/AOPS), anti-two-block device, slew/luffing/hoist limit switches, and emergency stop systems
Inspection of pedestal, kingpost base, and deck mounting: check fastener torques, corrosion protection (paint/coating), and structural integrity of the connection between crane and vessel structure
Electrical/control system check (for electric-hydraulic and all-electric cranes): insulation resistance test, inspection of junction boxes, cable routing, PLC and drive firmware status, and condition of motor terminals and contactors
Type-general inspection and maintenance points for this equipment category — not model-specific.
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