Inland navigation vessels - Connections and assembled hoses for the transfer of potable water; German version EN 16865:2016
1Key Takeaways
This European Standard specifies the design, dimensions, and technical requirements of connections and hose assemblies for bunkering drinking water for inland waterway vessels. These include: fixed connection on the supplier side; hose assembly; fixed connection on the consumer side; and a connection for retrofitting i…
2Expert Interpretation
An in-depth analysis of EN 16865:2016, the standard for connections and hoses for the transfer of drinking water on inland vessels, covers the technical requirements for quick connectors, hose material specifications, installation requirements, and hygiene and safety measures to ensure the hygienic safety and operational standardization of drinking water transfer systems on board vessels.
EN 16865:2016 Standard Framework and Technical Evolution
EN 16865:2016, "Connections and hoses for the transfer of drinking water on inland vessels," is a professional technical standard developed by the European Committee for Standardization (CEN) for drinking water supply systems on inland vessels. Published in 2016, member states were required to complete the transposition of the national standard by April 2017. The standard primarily specifies the technical requirements for quick-connect couplings, hose assemblies, and connectors in drinking water transfer systems, aiming to ensure the hygienic safety and ease of use of drinking water during the transfer process.
Background and Necessity of Standard Development
The supply of drinking water on inland vessels has long posed a hygienic and safety hazard, and traditional connection methods are prone to water contamination. Before the standard was established, the connectors used in various ports and ships had different specifications and the quality of hoses varied, which often led to the following problems:
| Problem Type | Traditional Method Risks | EN 16865 Solution |
|---|---|---|
| Connection mismatch | Interface leakage, water pollution | Unified C-type quick connector specifications |
| Hose hygiene issues | Microbial growth, material dissolution | Strict material hygiene requirements |
| Lack of anti-pollution measures | Entry of impurities and insects into the system | Mandatory configuration of blind plate connectors |
| Inconvenient operation | Difficult connection, time-consuming and labor-intensive | Standardized quick connection design |
The implementation of this standard can effectively prevent suppliers from using inappropriate hoses, avoid pollutants from entering drinking water tanks through deck openings during the bunkering process, and ensure that the drinking water quality meets the requirements of EU Directive 98/83/EC.
Detailed explanation of the technical requirements for core components
Quick connector system
The standard requires the use of a C-type quick connector system, including:
- Fixed connector: Permanently installed on the ship deck or piping system, including ISO 228-G 2 A (DN 50) pipe threaded connector
- Hose connector: Complies with DIN 14302 standard and is connected to the hose through a hose clamp
- Blind plate connector: Complies with DIN 14311 standard and must be connected through non-detachable methods such as chains and S hooks
The nominal size of the connector system is 52=C to ensure the interchangeability of equipment from different suppliers.
Technical requirements for hoses
Drinking water transport hoses must meet the following stringent requirements:
| Performance indicators | Technical requirements | Test standards |
|---|---|---|
| Working pressure | 1.2 MPa (12 bar) | EN ISO 9093-1 |
| Temperature range | -20°C to 60°C | DVGW VP 549 |
| Light transmittance | Opaque | Prevents algae growth |
| Abrasion resistance | High abrasion resistance | Tested in actual use |
| Chemical resistance | Resistant to common cleaning and disinfecting agents | DVGW VP 550 |
Installation and layout requirements
Space layout specifications
The standard sets clear requirements for the installation location of connectors:
- Connectors must be easily accessible, allowing hoses to be easily connected with a 500mm bending radius
- Sufficient operating space is provided to ensure the plugging, unplugging and locking operations of quick connectors
- The installation location should be protected to avoid damage during ship operation
- Fixed connectors must be permanently connected to the ship by bonding or other means
Safety measures
To prevent unauthorized access, the standard requires:
- Blind joints must be lockable when closed
- Connections must be clearly marked using color coding (blue-green-blue)
- Nameplates must be provided with text at least 7mm high
- A "Drinking Water Connection" sign in the local language may be added
Material hygiene and safety requirements
All materials that come into contact with drinking water must meet hygiene requirements and must not affect the quality of drinking water:
- Pipe materials must comply with EN 10220 or equivalent standards
- Materials must be certified for hygiene
- They must not contribute to the water’s odor, color, or chemical contamination
- They must withstand routine cleaning and disinfection
Hoses must be blue with a green stripe to easily identify them as being for drinking water use only.
Special requirements for modified connections
For ships that already have deck flush closing devices (EN ISO 228-1 pipe threads), the standard provides three modification options:
| Modification type | Applicable conditions | Technical requirements |
|---|---|---|
| Type A (without reducer) | Deck closing devices comply with ISO 228 G 2 A | Direct connection |
| Type B (with reducer) | Deck closing devices do not comply with ISO 228 G 2 A | Use a reducer |
| Type C (with reducing elbow) | Special connection requirements | Horizontal lead-out connection |
The modified connector must be permanently fixed by welding or bonding to ensure connection reliability.
Implementation recommendations and precautions
Implementation recommendations for ship operators
- Carry out standard modifications to all drinking water connections to ensure compliance with EN 16865 requirements
- Establish hose cleaning and disinfection operating procedures and equip necessary cleaning equipment
- Regularly check the sealing performance of the connectors and the aging of the hoses
- Provide standardized operation training for operators
Notes for equipment manufacturers
- Manufacture connectors and hose assemblies in strict accordance with standard requirements
- Ensure that all materials have corresponding hygiene certification documents
- Provide detailed instructions for use and maintenance
- Mark that the product complies with EN 16865 Standard Requirements
Inspection and Maintenance Requirements
- Establish a regular inspection system to check the wear of joints
- The hose should be replaced according to the frequency of use
- Maintain the cleanliness and integrity of the blind joints
- Record relevant information for each drinking water filling operation
Benefit Analysis of Standard Implementation
The implementation of EN 16865:2016 will bring the following significant benefits:
| Benefit Dimensions | Status Before Implementation | Improvements After Implementation |
|---|---|---|
| Hygiene and Safety | High Risk of Water Pollution | Greatly Reduced Risk of Microbial Contamination |
| Operational Efficiency | Difficult and Time-consuming Connection | Quick Connection and Easy Operation |
| Equipment Compatibility | Different Specifications and Incompatibility | Standardized and Strong Versatility |
| Maintenance Cost | Frequent and High Cost of Maintenance | Extended Lifespan and Easy Maintenance |
Through the full implementation of this standard, the safety, reliability and operational efficiency of inland waterway vessel drinking water transmission systems will be significantly improved, providing better protection for ship operations.