Design Standards
Design considers applicable External Floating Roof requirements.
Rim Seal engineering that accounts for tank-shell variation and roof movement
External Floating Roofs move vertically with the product surface and are directly exposed to the environment. World Bridge engineers Primary Seal and Secondary Seal systems for crude-oil and refined-product tanks, focusing on effective sealing, shell variation and long-term durability.
Variable Rim Gap
Configurations accommodate different Rim Gap conditions caused by tank-shell variation.
Independent Primary / Secondary Seal
The Primary Seal operates independently without interfering with the Secondary Seal.
DESIGN FEATURES
Product Design & Key Benefits
Review the key design features and application benefits.
✓ API 650 Appendix C
✓ Chemical Resistance
✓ Tank Shell Condition Considered
✓ US EPA Requirements Considered
✓ FEM Structural Analysis Applied
✓ Accessories to Customer Requirements
✓ Accommodates Roof Movement, Shell Variation, Contraction & Expansion
✓ Crude Oil & Refined-Product Applications
✓ Liquid/Vapor sealing Application
✓ Supports 100–250mm Rim Gap
✓ Custom Riveted Tank Seal
✓ Teflon Wiper / Low Height Secondary / PE Coated Seal
PRODUCT CONFIGURATION
Multiple Seal Designs
WB-1 · Pantograph Type
Pantograph Type Seal widely used for crude-oil storage tanks
- Rim space 200mm ± 100mm
- Seal weight 45kg/m
WB-2 · Plate Spring Type
Crude-oil storage seal using a Plate Spring
- Rim space 200mm ± 100mm
- A240-301(Hard)
- Seal weight 40kg/m
WB-7 · Graver Foam Type
Liquid & Vapor Mounted Type
- Envelope: NBR / Teflon / PE
- Foam Block: PU
WB-50 · Secondary Wiper
Secondary Wiper Seal for weather shielding
- Wiper & Vapor Barrier Membrane
- Wiper Tip & Compression Plate
GALLERY
External Floating Roof Seal Application Images
Review External Floating Roof Seal structures and actual application configurations.
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