QINGDAO DOOWIN MARINE ENGINEERING CO., LTD.
| Payment Terms | T/T |
| Name | Hydro Pneumatic Fenders |
| Application | Submarine, Semi-submerible Rigs |
| Production Standard | ISO 17357-1:2014 |
| Fender Type | Sling Type or Net Type |
| Working Pressure | 50kPa or 80kPa |
| Accessories | Air Valve, Safety Valve, Water Filling Valve |
| Counter weight | Aounter weight with chain and shackles |
| Packaging Details | Pallet or Plywooden Box |
| Delivery Time | 2~3 weeks |
| Supply Ability | 10pcs/per week |
| Brand Name | DOOWIN MARINE |
| Model Number | HF |
| Certification | CCS, BV, ABS, LR |
| Place of Origin | China |
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Product Specification
| Payment Terms | T/T | Name | Hydro Pneumatic Fenders |
| Application | Submarine, Semi-submerible Rigs | Production Standard | ISO 17357-1:2014 |
| Fender Type | Sling Type or Net Type | Working Pressure | 50kPa or 80kPa |
| Accessories | Air Valve, Safety Valve, Water Filling Valve | Counter weight | Aounter weight with chain and shackles |
| Packaging Details | Pallet or Plywooden Box | Delivery Time | 2~3 weeks |
| Supply Ability | 10pcs/per week | Brand Name | DOOWIN MARINE |
| Model Number | HF | Certification | CCS, BV, ABS, LR |
| Place of Origin | China | ||
| High Light | Hydro Pneumatic Fenders 50kPa ，Hydro Pneumatic Fenders 80kPa ，Hydropneumatic Fenders 50kPa | ||
Vertically used Hydro Pneumatic Fenders to Protect the Submarine
Hydro-pneumatic fenders are specialized marine buffering systems predominantly used for the berthing of submarines and vessels characterized by low freeboard and high draft. These design features often necessitate fender contact below the waterline, requiring solutions that can withstand submerged operational conditions.
Hydro-pneumatic fenders are engineered and fabricated to exceed the structural integrity of standard pneumatic fenders, addressing elevated pressure demands inherent to such applications. The fender construction incorporates a partial water-filling process, followed by air pressurization and ballasting to maintain stability at the designated draft line. This configuration ensures optimal performance in underwater environments, where the water volume within the fender directly correlates with reaction force, energy absorption capacity, and minimum endurable pressure thresholds.
Key Advantages of Hydro-Pneumatic Fenders
High Energy Absorption: Efficient dissipation of kinetic energy during berthing impacts.
Low Reaction Force: Minimized structural stress on both vessel and dock infrastructure.
Reduced Maintenance: Durable materials and design extend service life.
Enhanced Air Retention: Advanced sealing mechanisms prevent pressure loss over time.
Customizable Design: Tailored dimensions and performance parameters to meet specific operational requirements.
Submerged Contact Interface: Designed for reliable performance below the waterline.
Minimal Hull Pressure Distribution: Prevents damage to sensitive vessel coatings, including acoustic tiles.
Variable Draft Adaptability: Adjustable ballasting systems accommodate fluctuating load conditions.
Primary Applications of Hydro-Pneumatic Fenders
Submarines: Critical for stealth operations requiring non-intrusive berthing solutions.
High-Speed Ferries (Select Models) : Optimized for vessels with dynamic loading profiles.
Semi-Submersible Oil Rigs: Stabilization during offshore docking procedures.
Technical Context
The hydro-pneumatic principle combines hydraulic (water) and pneumatic (air) systems to achieve controlled compression, as evidenced in modular suspension technologies where fluid-air interactions isolate vibrations.
Similar fractional modeling approaches validate the nonlinear stiffness characteristics of hydro-pneumatic components, ensuring predictable performance under variable loads.
These principles are mirrored in HPNE fenders, where water-air volume ratios dictate energy absorption efficiency
| Model | Air Filled (No Water) | Partially Water Filled (65:35) | ||||
|---|---|---|---|---|---|---|
| Energy (kNm) | Reaction (kN) | Water:Air | Energy (kNm) | Reaction (kN) | ||
| HPF 1700x7200 | 566 | 1774 | 0:100 | 135 | 599 | |
| HPF 2000x6000 | 653 | 1731 | 0:100 | 157 | 587 | |
| HPF 2500x5500 | 937 | 1996 | 0:100 | 225 | 673 | |
| HPF 3300x6500 | 1932 | 3106 | 0:100 | 622 | 1222 | |
| HPF 3300x10500 | 3151 | 5067 | 0:100 | 595 | 1250 | |
Hydro Pneumatic Rubber Fenders Installation
Company Details
Business Type:
Manufacturer
Year Established:
2011
Total Annual:
3000000-5000000
Employee Number:
60~80
Ecer Certification：
Verified Supplier
Doowin Marine is a professional manufacturer of ship launching airbags, pneumatic rubber fenders, foam-filled fenders, inflatable pipe plugs, and offshore foam buoys. Doowin Marine is the leading manufacturer of ISO 14409:2011 or CB/T 3795 rubber airbags/marine inflatable airbags. Marine rubber airb... Doowin Marine is a professional manufacturer of ship launching airbags, pneumatic rubber fenders, foam-filled fenders, inflatable pipe plugs, and offshore foam buoys. Doowin Marine is the leading manufacturer of ISO 14409:2011 or CB/T 3795 rubber airbags/marine inflatable airbags. Marine rubber airb...
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