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Jiangsu Dingchuang Marine Equipment Co.,Ltd.
DS/ES, FS
DS/ES, FS by Jiangsu Dingchuang Marine Equipment Co.,Ltd.. DNV TA certificate TAP00002SW.
Inspector Detail
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Common issues
- Hydraulic seal leakage at the rotary vane housing, leading to oil loss and reduced torque
- Air entrainment in the hydraulic system causing sluggish or erratic rudder response
- Wear of vane tip seals reducing holding torque and increasing internal leakage/rudder creep
- Rudder stock coupling or key wear causing play between tiller and stock
- Solenoid or control valve sticking causing slow or asymmetric rudder response
- Corrosion of the tiller flat and steering gear room components in a humid environment
- Alarm/monitoring system faults such as rudder angle feedback or telemotor synchronization errors
Inspection checklist
- Check hydraulic oil level and condition, and sample for water/particulate contamination
- Function test of both (or all) power units, including changeover between pumps
- Verify rudder angle indicator accuracy against actual rudder position at the helm and in the steering gear room
- Test emergency/local steering control and alarm functions
- Inspect the rotary vane housing and seals for external leakage
- Check the tiller/rudder stock coupling for play, key condition, and locking arrangement
- Test steering gear response time hard-over to hard-over against required performance
- Inspect relief valves and buffer/isolating valves for correct operation
- Check hydraulic pipework, hoses, and fittings for leaks and chafing
- Verify non-follow-up and follow-up steering modes operate correctly
Service intervals
| Hydraulic oil sampling | every 6 months, or per class/manufacturer schedule |
| Hydraulic oil change | typically every 2-3 years or on condition |
| Rudder angle indicator calibration check | every 6-12 months |
| Full steering gear function test including changeover | before each departure (statutory); detailed test at each dry-dock/survey |
| Rotary vane seal inspection/overhaul | condition-based, commonly at dry-dock every 5 years |
| Relief valve setting check | annually |
Typical wear limits
| Rudder stock coupling key/keyway wear | check for measurable play against the coupling manufacturer's tolerance, typically a few tenths of a millimetre - confirm against the equipment manufacturer's manual |
| Internal hydraulic leakage (rudder creep under load) | class/SOLAS generally expects rudder movement under standing load to stay within a small tolerance over a defined time - confirm against the vessel's approved test procedure |
| Vane housing seal wear | replace on visible external leakage or when internal bypass causes response time to exceed the required hard-over duration |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Rotary vane seal set (vane tip and housing seals)
- Hydraulic pump/motor unit spares as fitted
- Solenoid control valves
- Relief valves
- Rudder angle transmitter/feedback unit
- Hydraulic hoses and fittings
- Coupling keys/bolts for the tiller-to-rudder-stock connection
Safety
- Stored hydraulic pressure - isolate and depressurize before opening any hydraulic component
- Rudder movement during maintenance if the steering gear is not mechanically locked/blocked
- Confined space and access hazards in the steering gear compartment
- Risk of loss of steering if changeover between power units is not verified working before departure
Class survey
Steering gear is a statutory/class item under SOLAS Ch. II-1 - class checks the steering gear test record, changeover test before departure, and rudder response/hard-over timing at each annual and special survey. Keep hydraulic oil sampling records and any seal replacement history documented.
Estimated lifetime:
Rotary vane steering gear units are generally designed for the vessel's full service life (around 20-25 years) with periodic seal replacement; major internal components are typically overhauled roughly every 5 years - confirm against the manufacturer's maintenance manual.
Components & Design
Component data being added…
Technical Data
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Maritime Network →DNV type approval
Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.
- Certificate
- TAP00002SW
- Approved as
- Vent Head for Tank · Mechanical Equipment and Piping
- Certificate holder
- Jiangsu Dingchuang Marine Equipment Co.,Ltd. (China)
- Valid until
- 2028-11-13
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Equipment Model #52074
· ✓ still in production