PTFE hose type 11-8850T
PTFE hose type 11-8850T by DUNLOP HIFLEX OY is a PTFE-lined flexible hose identified in the supplied record for a steering-gear-related application. In a hydraulic installation, the hose provides a flexible connection where rigid pipework would be unsuitable because of movement, vibration or installation geometry. The PTFE liner carries the fluid while reinforcement and end fittings provide pressure containment and mechanical connection. Service condition depends heavily on routing, bend radius, chafe protection, fitting integrity and compatibility with the hydraulic medium. Neighboring hose variants may differ in size, reinforcement, end fitting and pressure/temperature capability; the supplied record does not define those detailed differences. Never substitute a visually similar hose without verifying the exact approved specification and installation requirements.
Inspector Detail
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Common issues
- Outer cover abrasion from chafing against structure or other pipework
- Corrosion of the reinforcement braid where the cover has been damaged, hidden until the cover is cut back
- End-fitting swage/crimp leakage or slippage
- Kinking below the minimum bend radius, reducing burst pressure margin
- Hydraulic fluid permeation through the liner over long service life
Inspection checklist
- Visual check for bulges, soft spots, cover damage or leakage at fittings
- Verify the hose carries the correct DNV Type Approval marking (TAP000007C) and date-of-manufacture band
- Check routing and chafe protection have not been altered since installation
- Confirm bend radius at all points meets the manufacturer's minimum
- Pressure/leak test after any new installation or fitting rework
Service intervals
| Visual inspection | at each planned maintenance round covering the steering gear hydraulic system, commonly monthly to quarterly |
| Replacement | based on the hose manufacturer's stated service life for this PTFE hose type and observed condition - not a fixed universal figure, reviewed at each dry-docking |
Critical spares
- Spare hose assembly of the same DNV-approved type and pressure rating
- Spare end fittings/ferrules if the hose is field-attachable
- Hose clamps/mounting brackets and chafe-guard sleeving matched to the installation
Safety
- High-pressure hydraulic fluid injection injury from a pinhole leak - never search for a leak with bare hands
- Whip hazard if an end fitting fails under pressure
- Fire risk if hydraulic fluid sprays onto hot surfaces nearby
Class survey
Steering gear hydraulic hoses fall under SOLAS Ch.II-1 steering gear requirements. Surveyors check the DNV Type Approval certificate is valid for the installed hose, visual condition at periodical/annual survey, and that any hose replacement is logged in the vessel's PMS.
Components & Design
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Technical Data
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Common failures & inspection points
Service & Maintenance
Inspect the full visible hose length, end fittings, supports, chafe protection and routing as part of the steering-gear PMS. Check that no modification has introduced twisting, excessive bending or contact with hot or sharp surfaces. Any hose showing leakage, exposed reinforcement, fitting movement, severe abrasion or other rejection condition should be replaced in accordance with the maker instructions. During steering-gear survey, flexible connections may be checked for condition, approved type and freedom from leakage. Use the manufacturer documentation for exact service life, pressure rating, bend radius and replacement criteria.
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DNV type approval
Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.
- Certificate
- TAP000007C
- Approved as
- Flexible Hoses of Non-Metallic Material with Permanently Fitted Couplings · Mechanical Equipment and Piping
- Certificate holder
- DUNLOP HIFLEX OY (Finland)
- Valid until
- 2029-06-30