Pantograph Primary Seal

Name: Pantograph Primary Seal
Brand: Vyapar Infotech
Rating: 5.0 (2460 reviews)

A Pantograph Primary Seal is a mechanically actuated primary rim seal system designed for External Floating Roof Tanks (EFRTs). The seal utilizes a series of articulated pantograph linkage assemblies that apply a uniform radial force to press a reinforced elastomeric sealing element continuously against the tank shell. Unlike conventional spring-loaded seals, the pantograph mechanism maintains nearly constant sealing pressure throughout the full operating range of the floating roof, even under shell out-of-roundness, thermal expansion, wind loading, and roof movement. The system provides superior vapour-tight sealing, minimizes hydrocarbon emissions, reduces product evaporation losses, and enhances operational safety and service life. Pantograph Primary Seals are widely used where high sealing efficiency, low maintenance, and long-term reliability are required.

Typical Application

• External Floating Roof Tanks (EFRT).
• Crude Oil Storage Tanks.
• Gasoline Storage Tanks.
• Diesel Storage Tanks.
• Naphtha Storage Tanks.
• Kerosene Storage Tanks.
• Aviation Turbine Fuel (ATF) Storage Tanks.
• Aromatic Hydrocarbon and Petrochemical Storage Tanks.
• Petroleum Refineries.
• Petrochemical and Chemical Plants.
• Tank Farms and Bulk Liquid Storage Terminals.
• LNG/LPG terminals (where approved by project specifications for associated liquid hydrocarbon storage).
• New tank construction, floating roof upgrades, and seal 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 Electricity Protection
• API RP 545 Rev.1 – Lightning Protection of Aboveground Storage Tanks (bonding, insulation kits, and current bypass recommendations).
• 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 compatibility).
• 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, Saudi Aramco, ADNOC, Shell, ExxonMobil, Chevron, TotalEnergies and other EPC/PMC organizations.

Material of Construction (MOC) : - Shoe plate will be pre-galvanizing sheet as per IS 277 / AISI 304 / AISI 316 OR EN Equivalent grade as per customer requirement and compatible to the stored product in the tanks. The pantograph arms Mechanism will be AISI 304 / AISI 316 and the flexible fabric (Seal Curtain) will be PTFE / P U Coated Fabric or NBR coated Fabric as per customer requirement and can be select compatible to the stored product in the tanks.

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.