The British Standard for water storage tanks is primarily governed by BS EN 805:2000, which sets out requirements for the design, construction, and installation of water mains and services. While this standard focuses on public water supply systems, it influences best practices for domestic and commercial water storage tanks, emphasizing safety, hygiene, and durability.
Understanding British Standards for Water Storage Tanks
When it comes to storing water safely and effectively in the UK, adhering to established standards is crucial. These standards ensure that your water storage solution is hygienic, durable, and compliant with regulations. While there isn’t one single, overarching British Standard specifically for all types of domestic water storage tanks, several key standards and guidelines inform their design, manufacture, and installation.
The Role of BS EN 805:2000
The most significant standard that impacts water storage in the UK is BS EN 805:2000. This European Standard, adopted in the UK, deals with the requirements for water mains and services. Although it primarily addresses public water supply infrastructure, its principles are highly relevant for any system storing potable water.
It covers aspects like:
- Materials used for pipes and fittings
- Design considerations for pressure and flow
- Installation practices to prevent contamination
- Testing and commissioning of systems
This standard emphasizes the importance of preventing contamination and ensuring the quality of drinking water throughout the supply chain, which directly extends to the storage phase.
Other Relevant Standards and Guidelines
Beyond BS EN 805:2000, several other standards and regulations play a role in the specification and use of water storage tanks:
Water Regulations Advisory Scheme (WRAS)
WRAS approval is a vital certification for components used in water systems in the UK. Any tank, fitting, or material that comes into contact with wholesome water (water fit for human consumption) must be WRAS approved. This ensures that the product does not:
- Contaminate the water
- Waste water
- Unreasonably conserve water
- Prejudice the efficiency of the water supply system
Manufacturers will typically highlight WRAS approval on their products, giving consumers confidence in their suitability for potable water storage.
BS 13280:2001 – Tanks for water
While BS EN 805 is a primary influence, BS 13280:2001 provides specific guidance for tanks for water. This standard covers the requirements for the design, construction, and testing of static tanks intended for the storage of cold water. It addresses materials, structural integrity, and methods for ensuring the tank is fit for purpose.
Material Standards
The materials used in water storage tanks are critical for hygiene and longevity. Standards like those for polyethylene (e.g., BS 6275) and GPR (Glass Reinforced Plastic) often dictate the quality and suitability of the materials for contact with drinking water. These materials must be food-grade and resistant to corrosion and degradation.
Key Considerations for Water Storage Tanks
When selecting or installing a water storage tank, several factors, informed by these standards, are paramount:
- Material Quality: Ensure the tank is made from food-grade, non-toxic materials that won’t leach chemicals into the water.
- Hygienic Design: The tank should be designed to prevent the ingress of contaminants like dirt, insects, or vermin. Smooth internal surfaces and secure lids are essential.
- Ventilation: Proper ventilation is needed to prevent stagnant water and the growth of bacteria, often incorporating a screened vent.
- Access and Cleaning: The tank should allow for easy access for inspection and periodic cleaning to maintain water quality.
- Installation: Correct installation, including proper support and connection to the water system, is vital to prevent leaks and ensure system integrity.
Why Adhering to Standards Matters
Following British Standards and WRAS guidelines for water storage tanks offers significant benefits:
- Public Health: It ensures the water stored remains safe for consumption, preventing waterborne illnesses.
- Durability and Longevity: Tanks built to standard specifications are designed to withstand environmental conditions and last longer.
- Regulatory Compliance: It helps avoid penalties and ensures your installation meets legal requirements.
- Peace of Mind: Knowing your water storage system is compliant provides assurance of its reliability and safety.
People Also Ask
### What is WRAS approval for water tanks?
WRAS approval signifies that a water fitting or material has been examined by the Water Regulations Advisory Scheme and meets the requirements of the UK Water Supply (Water Fittings) Regulations 1999. For water storage tanks, this means they are safe to use with wholesome water, won’t contaminate it, and won’t waste or prejudice the water supply system.
### What is the best material for a water storage tank in the UK?
The best material often depends on the application, but polyethylene (plastic) is very popular for domestic use due to its cost-effectiveness, durability, and resistance to corrosion. Glass Reinforced Plastic (GRP) is another excellent option, known for its strength and longevity, often used in larger commercial or agricultural settings. Both materials, when WRAS approved, are suitable for storing potable water.
### How often should a domestic water storage tank be cleaned?
Domestic water storage tanks should ideally be inspected annually and cleaned every 2-3 years, or more frequently if water quality issues are suspected or if the tank is located in an area prone to dust or contamination. Regular cleaning prevents the buildup of sediment and biofilm, ensuring water remains fresh and hygienic.
### What are the legal requirements for water storage tanks in the UK?
In the UK, water storage tanks must comply with the Water Supply (Water Fittings) Regulations 1999, which are enforced by local water authorities. Key requirements include using WRAS-approved materials, ensuring the tank prevents contamination of the water supply, and that it does not waste or unduly conserve water.
Next Steps for Your Water Storage Needs
Understanding the relevant standards is the first step. When looking for a water storage solution, always seek out tanks that are WRAS approved and manufactured by reputable companies. If you are unsure about specific requirements or installation, consulting with a qualified plumber or water systems specialist is highly recommended. They can guide you on the best tank for your needs and ensure it is installed correctly according to all applicable regulations.