Floating roof tanks (FRT) are the industry standard for minimizing evaporative loss and fire risk in crude oil storage. Center Enamel specializes in the engineering and manufacture of Internal (IFR) and External (EFR) Floating Roofs compliant with API 650 Appendix C & H. By eliminating the vapor headspace, our designs reduce Volatile Organic Compound (VOC) emissions by up to 99%, significantly enhancing operational safety and ROI for refineries, terminal hubs, and strategic reserves in over 100 countries.
Feature | Technical Specification | Strategic Reliability Value |
Design Standards | API 650, NFPA 30, BS EN 14015 | Ensures global compliance for flammable liquid storage. |
Roof Type | Pontoon or Double-Deck Floating Roof | Provides inherent buoyancy and emergency drainage. |
Vapor Mitigation | Primary & Secondary Seal Systems | Eliminates 98-99% of "breathing" and "filling" losses. |
Material Grade | ASTM A36 / Q345R / Aluminum 6061 | High-yield strength with marine-grade corrosion resistance. |
Drainage System | Articulated Pipe or Flexible Hose | Prevents roof sinking during heavy rainfall events. |
Compatibility | Welded Steel & Bolted FBE Tanks | Versatile integration for new builds or retrofits. |
In a traditional fixed-roof tank, the space between the liquid and the roof (headspace) allows crude oil to evaporate, leading to significant financial loss and environmental hazards. Center Enamel’s floating roof rests directly on the liquid surface.
● Mechanical Shoe Seals: Our primary seals use a metallic shoe held against the tank shell by a weighted or spring-loaded mechanism, ensuring a tight fit even as the roof moves.
● VOC Reduction: By eliminating the air-vapor interface, our tanks satisfy the most stringent global environmental regulations, such as EPA OOOOa, preventing the release of hazardous air pollutants (HAPs).
● Elimination of Explosive Atmosphere: Since there is no vapor-rich headspace, the risk of a lightning strike or static discharge causing an internal explosion is effectively neutralized.
● Auto-Bleeder Vents: These vents automatically open when the roof is low (supported by legs) and close when the roof is floating, ensuring safe pressure equalization during initial filling and final withdrawal.
● Seismic Stability: Utilizing Finite Element Analysis (FEA), our floating roofs are designed to withstand "sloshing" effects during seismic events, preventing roof-to-shell contact and maintaining seal integrity.
As Asia’s leading manufacturer of high-performance containment, Center Enamel offers a unique technological advantage:
● Hybrid Coating Solutions: We pair our floating roofs with Fusion Bonded Epoxy (FBE) or Glass-Fused-to-Steel (GFS) shells, providing the ultimate double-barrier against the corrosive components (sulfur and chlorides) found in sour crude.
● Customized Drainage & Access: Our roofs feature articulated drainage systems to handle high-intensity tropical rainfall and non-sparking rolling ladders for safe operator access.
● Global Project Footprint: With 30,000+ successful installations, our logistical team ensures the modular components of your floating roof arrive on-site for rapid, weld-free (bolted) or high-precision (welded) assembly.
Q: What is the difference between an IFR and an EFR?
A: An Internal Floating Roof (IFR) operates inside a fixed-roof tank, protecting the roof and seals from snow and rain. An External Floating Roof (EFR) is exposed and is typically used for massive-diameter tanks where a fixed roof is structurally impractical.
Q: How do you prevent the roof from "sinking" during operation?
A: We utilize multi-compartment pontoons. Each pontoon is individually pressure-tested. If one compartment is breached, the remaining pontoons provide sufficient buoyancy to keep the roof afloat, as per API 650 requirements.
Q: Can a floating roof be retrofitted into an existing tank?
A: Yes. Center Enamel’s modular Aluminum Internal Floating Roofs are designed to be brought through existing manways and assembled inside the tank, making them an ideal upgrade for older fixed-roof assets.
