Professional Diving, Underwater Inspection, and Hull Cleaning Services in Vietnam
In the global maritime industry, maintaining a vessel’s underwater hull condition is paramount to achieving fuel efficiency, ensuring structural integrity, and complying with international maritime regulations. VNS – Vietnam Ship Services Company is a premier provider of commercial diving and underwater inspection services in Vietnam.
With a team of highly certified commercial divers and state-of-the-art marine equipment, we deliver 24/7 underwater maintenance, cleaning, and technical repair solutions at all major ports and anchorages across Vietnam. Our services are engineered to help shipowners, managers, and charterers minimize dry-docking costs and eliminate costly operational downtime.
Our Comprehensive Scope of Underwater Marine Services
At VNS, we offer a full spectrum of commercial diving solutions tailored to the strict standards of international classification societies (such as DNV, ABS, LR, BV, NK, and KR). Our core underwater services include:
1. Underwater Inspection and In-Water Surveys (IWS)
Routine and emergency underwater inspections are critical to assessing a ship’s seaworthiness. We provide:
- Class Approved In-Water Surveys: Pre-drydock surveys, extension of dry-docking surveys, and sale/purchase inspections using high-resolution underwater CCTV and digital photography.
- Structural Integrity Assessments: Detailed visual inspections of the hull plating, welding seams, rudder, propeller, and sea chest grids.
- Non-Destructive Testing (NDT): Ultrasonic Thickness Measurement (UTM) to detect steel corrosion and hull gauging without removing the vessel from the water.
2. Underwater Hull Cleaning & Biofouling Removal
The accumulation of marine growth (barnacles, tube worms, algae) drastically increases hydrodynamic drag, leading to excessive fuel consumption and carbon emissions. Our cleaning services feature:
- Advanced Brush Kart Systems: Utilizing specialized hydraulic multi-brush karts to safely remove heavy biofouling from the flat bottom and vertical sides without damaging the anti-fouling hull coating.
- Sea Chest & Grid Cleaning: Clearing internal sea chests, intake valves, and cooling water grids to ensure optimal engine cooling performance.
- Eco-Friendly Operations: Adhering to strict international biofouling management guidelines to prevent the translocation of invasive aquatic species.
3. Propeller Inspection, Maintenance & Polishing
A fouled propeller compromises engine torque and reduces transit speed. VNS optimizes propeller performance through:
- Micro-Smooth Propeller Polishing: Polishing propeller blades underwater to a multi-grade finish (matching Rupert Scale Class A/B) to maximize fuel efficiency.
- Damage Inspection & Repair: Inspecting blades for cavitation, cracks, or bending, and performing underwater cold cutting or grinding to restore balance.
4. Underwater Technical Repair & Maintenance
When mechanical failures occur below the waterline, our commercial divers perform complex technical repairs in situ:
- Certified Underwater Wet Welding: Class-approved underwater welding and cutting for temporary or permanent structural repairs.
- Sacrificial Anode Replacement: Installing and replacing zinc or aluminum sacrificial anodes to protect the hull and rudder from galvanic corrosion.
- Blanking and Plugging: Underwater blanking of sea chests, overboard discharges, and transducer locations to allow internal valve repairs while the ship is afloat.
- Rudder and Stern Tube Repairs: Inspecting rudder clearances, checking pintle wear down, and sealing rope guards or stern tube leakages.
5. Emergency Salvage & Underwater Recovery
- Object Recovery: Locating and retrieving lost anchors, anchor chains, dropped cargo, or specialized ship equipment.
- Emergency Hull Patching: Installing underwater cofferdams or specialized patches to seal structural breaches caused by collisions or groundings.
Learn more about us: Ship repair in Vietnam.
Nationwide Coverage: Serving All Vietnamese Ports & Anchorages
VNS operates a highly mobile logistics network, enabling our diving and underwater inspection services in Vietnam to deploy rapidly to any maritime hub in the country. We provide continuous support at both berths (terminals) and offshore anchorages.
Northern Vietnam Region
- Hai Phong Port & Anchorages: Serving Hon Dau anchorage, Lach Huyen deep-sea terminal, Nam Hai Dinh Vu, and Cam Pha.
- Cam pha & Cai Lan: Specialized underwater cleaning and inspection at Cai Lan port, Hon Gai anchorage, and Mong Cai.
- Nghi Son & Hon gai Ports: Providing rapid-response diving for bulk carriers and tankers.
Central Vietnam Region
- Da Nang & Son Duong Ports: Comprehensive diving services at Da Nang port, Lien Chieu, and Son Duong port (Formosa).
- Quy Nhon & Dung Quat: Servicing container vessels and oil tankers at Dung Quat refinery port and Quy Nhon anchorage.
- Other Central Terminals: Active deployment available at Chan May, Van Phong Bay (ideal for deep-water floating storage), Vinh Tan, Hon La, Vissai, and Cua Lo ports.
Southern Vietnam Region
Phu My & Dong Nai Ports: Serving specialized product tankers and general cargo vessels.
Vung Tau Anchorage (Key Maritime Hub): Offering 24/7 offshore diving, hull cleaning, and class surveys at Ganh Rai anchorage, Thieng Lieng, and pilot stations.
Cai Mep – Thi Vai Port Complex: Delivering precision underwater services at the deep-water container terminals (CMIT, TCTT, SSIT).
Saigon Port & Hiep Phuoc: On-site ship maintenance across all terminals in Ho Chi Minh City.
Why VNS is the First Choice for International Shipowners
When your vessel calls at a Vietnamese port, VNS guarantees peace of mind through a strict operational framework:
- Safety First: All diving operations strictly follow IMCA (International Marine Contractors Association) and ADCI safety guidelines.
- Class-Afloat Approvals: Our inspection reports are widely recognized by major international IACS members, streamlining your compliance processes.
- Advanced Technology: From hydraulic brush karts to live-feed underwater video systems, we use premium equipment to ensure speed and accuracy.
- Unmatched Efficiency: We coordinate closely with port authorities, agents, and ship staff to complete operations parallel to cargo handling, ensuring zero delay to your schedule.
* Equipment Setup:
– Deploy underwater inspection equipment: Prepare and position the remotely operated vehicle (ROV) or diving equipment for underwater inspection.
– Calibrate measurement devices: Ensure accurate measurements by calibrating equipment such as thickness gauges, ultrasonic testing devices, or cathodic protection meters.
* Underwater Inspection:
Submerged inspection: Carry out a comprehensive inspection of the vessel’s underwater components, such as the hull, propellers, rudders, sea chests, valves, and anodes.
Visual examination: Use underwater cameras to capture high-resolution images and videos of the components, paying close attention to areas prone to damage, corrosion, or fouling.
Measurements: Take measurements of critical parameters like hull thickness, anode condition, or propeller pitch using appropriate tools and techniques.
Non-destructive testing (NDT): Conduct NDT methods like ultrasonic testing, magnetic particle inspection, or dye penetrant testing to detect hidden defects or cracks.
Data collection: Record inspection findings, observations, measurements, and any abnormalities encountered during the inspection process.
Frequently Asked Questions (FAQ)
Q1: How much does underwater hull cleaning cost in Vietnam? The cost of underwater hull cleaning in Vietnam depends on several factors, including vessel size (LOA and beam), the degree of biofouling, port location, and operational conditions. For a standard bulk carrier or container vessel, prices typically range from USD 1,500 to USD 6,000. VNS provides fast, transparent quotations — usually within 1 hour of receiving vessel particulars. Contact us directly for an accurate estimate.
Q2: How long does an in-water survey (IWS) take? A standard Class-approved In-Water Survey at VNS typically takes 4 to 8 hours, depending on vessel size and the scope of inspection required. For larger vessels such as VLCCs or bulk carriers above 200m LOA, the operation may extend to 10–12 hours. We coordinate closely with ship staff and port agents to ensure all work is completed parallel to cargo operations with zero impact on your schedule.
Q3: Is VNS certified by international classification societies? Yes. VNS diving operations and inspection reports are recognized by all major IACS member classification societies, including DNV, ABS, Lloyd’s Register (LR), Bureau Veritas (BV), Nippon Kaiji Kyokai (NK), and Korean Register (KR). All surveys are conducted by certified commercial divers following IMCA and ADCI safety standards.
Q4: Which ports in Vietnam does VNS cover? VNS provides nationwide coverage across all major Vietnamese ports and anchorages, including Hai Phong, Hon Dau, Lach Huyen, Cam Pha, Cai Lan, Da Nang, Dung Quat, Quy Nhon, Vung Tau, Cai Mep – Thi Vai, and Saigon Port. Our mobile diving teams can be deployed within hours of vessel arrival at any location.
Q5: Can VNS perform emergency underwater repairs while the vessel is afloat? Absolutely. VNS specializes in emergency in-situ underwater repairs without the need for dry-docking. Our certified divers perform underwater wet welding, sacrificial anode replacement, sea chest blanking, stern tube sealing, and emergency hull patching — minimizing vessel downtime and avoiding costly dry-dock fees.
Contact VNS for Immediate Underwater Assistance
Get in touch for a fast quotation or technical consultation. We respond within the hour.
VNS Company — Head Office
Add: No 8, Hoang Minh Giam Street, Ward 9, Phu Nhuan District, Ho Chi Minh City
Tel: +84 32 5787918
Fax: +84 2253 739 556
Email: vietnamshipservice@gmail.com / vns.shiptech@gmail.com
VNS Company — Hai Phong Branch
Add: 213A, Lach Tray Street, Ngo Quyen District, Hai Phong City
Tel: +84 32 5787918
Fax: +84 2253 739 556
Email: vietnamshipservice@gmail.com / vns.shiptech@gmail.com
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