Vapour-Mounted Foam Seal (VMFS)

Name: Vapour-Mounted Foam Seal (VMFS)
Brand: Vyapar Infotech
Rating: 5.0 (7495 reviews)

A Vapour-Mounted Foam Seal (VMFS), also known as a Vapour Mounted Primary Foam Seal, is a primary rim seal system installed above the liquid surface in the annular vapour space between the floating roof and the tank shell. The seal consists of a continuous closed-cell foam core enclosed within a reinforced hydrocarbon-resistant elastomeric fabric envelope. The foam-filled envelope is attached to the floating roof using clamp bars and continuously presses against the tank shell to provide an effective vapor barrier. Since the seal remains above the liquid level, it is not in continuous contact with the stored product, making it suitable for a wide range of petroleum products. The system accommodates shell irregularities, thermal expansion, roof movement, and wind-induced deflection while minimizing evaporative losses, reducing VOC emissions, and improving operational safety.

Typical Application

• External Floating Roof Tanks (EFRT).
• Crude Oil Storage Tanks.
• Gasoline Storage Tanks.
• Diesel Storage Tanks.
• Naphtha Storage Tanks.
• Kerosene Storage Tanks.
• Jet Fuel (ATF) Storage Tanks.
• Petrochemical and Chemical Storage Tanks (material compatibility to be verified).
• Petroleum Refineries.
• Petrochemical Plants.
• Oil Terminals and Tank Farms.
• Marine Storage Facilities.
• New installations, seal replacement, and retrofit projects.

Guideline / Standard

Storage Tank Standards
• API 650 – Welded Tanks for Oil Storage (Appendix C – External Floating Roofs and Rim Seal Systems).
• API 653 – Inspection, Repair, Alteration and Reconstruction of Storage Tanks.

Lightning & Static Protection
• API RP 545 Rev.1 – Lightning Protection of Aboveground Storage Tanks.
• API 2003 – Protection Against Ignitions Arising Out of Static, Lightning and Stray Currents.
• NFPA 780 – Standard for the Installation of Lightning Protection Systems.

Fire Protection
• NFPA 11 – Standard for Low-, Medium-, and High-Expansion Foam Systems (rim seal fire protection systems).
• NFPA 30 – Flammable and Combustible Liquids Code.

Environmental Standards
• EPA 40 CFR Part 60 – Subparts K, Ka & Kb – Standards of Performance for Volatile Organic Liquid Storage Vessels (VOC emission control using primary and secondary rim seals).

International Standards
• EN 14015 – Specification for the Design and Manufacture of Site-built Vertical Cylindrical Steel Storage Tanks.
• EEMUA 159 – Aboveground Flat-bottomed Storage Tanks – Design, Construction, Inspection and Maintenance.

Indian Standards
• OISD-118 – Inspection and Maintenance of Aboveground Petroleum Storage Tanks.
• OISD-244 – Fire Protection Requirements for Petroleum Installations.
• Owner specifications issued by BPCL, HPCL, IOCL, ONGC, ADNOC, Saudi Aramco, Shell, ExxonMobil, Chevron, TotalEnergies and other EPC/PMC organizations.

Material of Construction (MOC) : - The Foam Blocks will be 18 to 24 density Polyurethane (PU) foam sheet in octagonal shape and Envelope / Foam casing will be Nylon Fabric equally coated on both side with NBR / P U (Polyurethane) or FKM Rubber (Viton Rubber) as per compatibility of the stored product.

High-Performance System

Our Liquid Mounted Primary Foam Seal provides reliable vapour sealing, reduces product loss, and enhances the safety and efficiency of floating roof storage tanks.