1. The Harsh Marine Environment
Marine vessels present one of the harshest working environments for industrial equipment. Onboard hydraulic systems – from steering gears and anchor winches to cargo hatch lifting systems – must constantly withstand salt corrosion, UV radiation, high-intensity vibrations, and extreme pressure. That is why in the maritime industry, installed materials and components cannot rely solely on manufacturers' promotional claims; they must pass the world's most rigorous testing procedures.
2. DNV Type Approval Certification
DNV (Det Norske Veritas) is one of the world's largest classification societies for the maritime industry. Achieving DNV Type Approval means that the equipment has been independently verified for absolute safety and reliability for onboard operation.
DNV certification for hydraulic hoses is mandatory for floating plants, oil tankers, FPSO vessels, and structures operating in the maritime, offshore oil and gas, and marine renewable energy sectors.
For marine piping systems, DNV certification (such as the DNV-OS-D101 standard) requires materials to pass a series of stringent tests:
- Pressure resistance: Must withstand hydrostatic pressure at 1.5 times the maximum working pressure.
- Fire resistance: Flexible hoses must comply with NS-EN ISO 15540 and ISO 15541 fire resistance standards, ensuring the system remains operational long enough to handle emergencies during a fire.
- Material durability: Ensures absolute safety when transferring various fluids such as fuel, seawater, exhaust gases, as well as cooling or lubricating systems.
Without DNV certification, shipowners face the risks of insurance rejection, port entry denial, or failing periodic inspections.

3. DNV-Approved Alfabiotech Hydraulic Hoses
In the marine hydraulic hose segment, the Alfabiotech Evolution series (including 4K, 5K, 5.5K, and 6K models) by Alfagomma Group is one of the few comprehensive solutions granted DNV Type Approval for marine piping systems. It complies with standards and guidelines for the design, construction, installation, inspection, and verification of marine piping systems and onboard equipment.
This hose series is specifically designed to solve the most challenging problems with impressive technical specifications:
- Outstanding working pressure: Up to 420–450 bar for the Alfabiotech 6K series.
- Wide temperature range: Operates stably and safely under temperatures from -40°C to +120°C.
- Eco-friendly fluid compatibility: The hose construction utilizes special synthetic rubber, which not only withstands petroleum-based hydraulic oils but is also perfectly compatible with Biodegradable Hydraulic Fluids – a mandatory trend for marine environmental protection today.
- Ultra-durable structure: Reinforced with 4 to 6 layers of high-tensile steel spirals, combined with Minetuff or Supertuff cover technology for superior resistance to abrasion, ozone, and hydrocarbons.
Utilizing DNV-approved Alfabiotech hoses allows shipbuilding and ship repair facilities to confidently complete classification dossiers, shorten acceptance testing periods, and optimize the lifecycle maintenance costs of the equipment.

4. Upgrade Your Marine Hydraulic Systems with VHE
Investing in DNV-approved materials like Alfabiotech hoses is an investment in the safety and reputation of the entire fleet.
At Vina Hydraulic Equipment Joint Stock Company (VHE), we provide high-quality hydraulic hose solutions tailored specifically for the maritime and shipbuilding industries.
For detailed technical consultation on applying Alfabiotech hoses to your project and to receive the most accurate current quotation, please contact VHE's engineering team directly.

- Consulting & Support (Zalo): 0903 067 588
- Support Email: [email protected]
- Office Address: 31, D20 Street, Phuoc Long Ward, Ho Chi Minh City, Vietnam
- Hanoi Warehouse Address: Km 28, National Route 6A, Dong De Industrial Zone, Phu Nghia Commune, Hanoi, Vietnam






