UV-Stabilized HDPE Outer Jacket with SS316 Bolting Assembly for Marine Pile Shielding
UV-Stabilized HDPE Outer Protective Jacket for Marine Pile Mechanical Shielding
The CNPetro PileCoat 2000F HDPE Outer Jacket is a modular protective jacket fabricated exclusively from seamless, UV-stabilized virgin high-density polyethylene sheeting. Engineered as the external mechanical shield within the PileCoat 2000F three-layer system, this tough outer shell provides the underlying anticorrosive tape layers with vital defense against wave action, drifting debris, mechanical impacts, and ultraviolet degradation.
Each jacket assembly includes M12 x 120 mm Hexagon Head SS316 Bolts, M12 A4 Self-Locking Nylon Insert Nuts, and dual M12 x 35 mm Penny Washers. Installation utilizes a specialized Hydraulic Tensioning Kit to achieve uniform bolting compression.
Material Engineering Data
| Property | Technical Metric | Test Standard |
|---|---|---|
| Base Material | Seamless Virgin High-Density Polyethylene (HDPE) | — |
| Resin Density | ≥ 0.940 g/cm³ | ASTM D792 |
| Tensile Strength at Yield | ≥ 29 N/mm | ASTM D638 |
| Tensile Strength at Break | ≥ 57 N/mm | ASTM D638 |
| Puncture Resistance | ≥ 400 N | FTMS 101C |
| Carbon Black Content | ≥ 2.0% | ASTM D1630 |
| UV Stabilization | Carbon black ≥ 2.0% for long-term outdoor exposure | ASTM D1630 |
| Fastener Type | M12 x 120 mm SS316 Hexagon Head Bolt | AISI 316 |
| Nut Specification | M12 A4 Self-Locking Nylon Insert Nut | ISO 10511 |
| Washer Specification | M12 x 35 mm Penny Washer (2 per bolt) | SS316 |
Design Features for Marine Durability
- Seamless Virgin HDPE Construction: Fabricated from 100% virgin high-density polyethylene — no recycled or regrind content — ensuring consistent mechanical properties and long-term reliability without brittle fracture risks associated with reprocessed materials.
- UV Degradation Resistance: Carbon black content ≥ 2.0% per ASTM D1630 provides robust protection against ultraviolet radiation-induced polymer chain scission, maintaining mechanical integrity throughout decades of tropical sun exposure.
- Wave and Impact Defense: FTMS 101C puncture resistance ≥ 400 N shields the underlying corrosion protection layers from floating debris, ice scouring, vessel berthing impacts, and storm wave forces.
- Modular Design: Jacket sections can be positioned and tensioned independently, accommodating pile diameters up to 2.4 meters and simplifying logistics for remote offshore installation sites.
- SS316 Corrosion-Resistant Fasteners: All bolting hardware is fabricated from AISI 316 stainless steel with self-locking nylon insert nuts, eliminating the risk of galvanic corrosion or vibration-induced loosening in the splash zone.
Installation Using Hydraulic Tensioning
- Positioning: Place the modular HDPE outercover sections over the tape-wrapped pile area, aligning the bolting bar channels.
- Initial Compression: Insert M12 x 120 mm SS316 Hexagon Head Bolts through the bolting bars. Install dual M12 x 35 mm Penny Washers and M12 A4 Self-Locking Nylon Insert Nuts on each bolt.
- Hydraulic Tensioning: Connect the specialized Hydraulic Tensioning Kit to the bolting bars. Gradually raise hydraulic pressure from 1500 psi to approximately 5000 psi, ensuring uniform compression across all bars.
- Final Locking: Torque all nylon insert lock nuts to the specified value while the hydraulic pressure is maintained, then slowly release the tensioning kit.
- Inspection: Verify uniform jacket compression and confirm all fasteners are fully engaged with no gaps between jacket edges.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.