WRAS (Water Regulations Advisory Scheme) is the UK approval body responsible for assessing products and materials used in drinking (potable) water systems. WRAS approval confirms that materials in contact with potable water comply with the UK Water Supply (Water Fittings) Regulations, ensuring they do not contaminate water or affect its taste, odor, color, or safety. The approval process involves testing material composition, chemical leaching, and long-term performance under potable water conditions. WRAS is widely recognized by UK water authorities and international projects that follow British water standards.
WRAS Approval Process: Based on NSF Testing and Evaluation
In practice, the WRAS approval process is often based on prior NSF material testing. Manufacturers typically first submit water-contact materials—such as resins, gel coats, sealants, and gaskets—for testing in accordance with NSF standards (e.g. NSF/ANSI 61). The NSF test results are then reviewed and recognized as part of the WRAS assessment. Based on these validated NSF test reports, WRAS issues its own approval, confirming compliance with UK potable water regulations.
WRAS Approved GRP/FRP/SMC water tank types
WRAS approved two GRP/FRP/SMC panel water tanks:
One is 45 degress and 90 degree combined flange bar panel connection GRP/FRP/SMC panel water tank.
One is four-side-90-degree flange bar connection GRP/FRP/SMC panel water tank.
Please Note: Click the above link and input WRAS number 250555037 to check the entire WRAS certificate online
Two GRP/FRP/SMC Water Tank Panel Connection Designs
Both GRP/FRP/SMC water tank panel designs are suitable for potable and industrial water storage but differ mainly in panel connection standards.
The full 90-degree flange connection design, with right-angle flanges on all panel edges, is commonly adopted in BS standards and SS 245 standard designs, emphasizing standardized panel structure, easy installation, and modular interchangeability.
The combined 45-degree and 90-degree flange connection design follows the China National Standard 12S101, where angled flanges are applied at selected edges to strengthen corner connections and improve overall structural stability.
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