The integrity and efficiency of atmospheric storage tanks (as per API 650 and API 653) equipped with external floating roofs rely on high-performance Tank Seals. These seals are not just a regulatory requirement; they are a strategic investment in environmental responsibility, operational safety, and asset longevity.
Types & functions of tank seals:
- Primary Seals: Installed directly in the annular space between the external floating roof and tank shell, they serve as the first barrier against volatile organic compound (VOC) emissions and prevent ingress of rainwater. Types include metallic shoe plate seals, compression plate seals, and foam-filled seals. Liquid-mounted designs generally offer the lowest emissions, in line with API and environmental guidelines.
- Secondary Seals: Positioned above the primary seal, these provide an additional layer of emission control, enhance fire safety, and minimize contamination from external sources. Modern secondary seals are engineered to operate independently of the primary seal and are vital for compliance in regions with strict emission limits.
Design considerations & standards
Tank Seals must deliver consistent tightness in the presence of tank shell irregularities and roof movement, ensure long-term durability (often 20+ years), and withstand product chemical exposure, UV, and ozone. Key aplicable standards include:
- API 650 & 653: Define structural integrity, material compatibility, and periodic inspection requirements.
- EN 14015, BREF, EPA, NFPA 11: Cover emissions performance, environmental practices, and fire safety features such as foam dam or foam port integration.
Why tank seals matter
- Emission Control: Well-designed seal systems can reduce vapor losses by up to 97% versus fixed roof tanks, directly contributing to lower carbon emissions and meeting stringent environmental regulations.
- Safety & Asset Protection: Effective seals reduce the risk of rim fires and product contamination, ensuring safer working conditions and maintaining product quality.
- Operational Reliability: Maintenance-free, long-lifespan seals lower the total cost of ownership and improve tank uptime, supporting efficient terminal or refinery operations.
The coteso tank seal solutions:
Coteso provides engineered Tank Seal solutions manufactured and qualified to exceed global standards. Our designs are tailored for every installation and product, combining robust emission control, custom fit for all tank geometries, and the highest grades of materials. We encourage storage terminal professionals and engineers to discover more—including technical details and photo documentation—by engaging with our recent LinkedIn post: https://www.linkedin.com/feed/update/urn:li:activity:7396158600651608065
For inquiries or more information, visit www.coteso.eu or connect with us on LinkedIn.
