3+1 Articulated System
Mechanical drainage system combining Steel Pipe with Flexible Swing Joint and Swivel Joint.
Floating Roof drainage solution backed by 30 years of field experience
The system is engineered to maintain roof buoyancy against accumulated rainwater based on tank size and site rainfall. Fully sealed units support articulated pipe drainage and submerged-liquid services, using NBR, Viton and Engineering Rubber seals for demanding pressure and temperature conditions.
3 / 4 / 6 / 8 inch
Multiple pipe diameters are available for site-specific configurations.
Hose Type
Smooth Bore flow paths support rapid drainage while repeatable lay patterns reduce internal interference.
DESIGN FEATURES
Product Design & Key Benefits
Key design, installation and inspection conditions for the Roof Drain System.
✓ Flexibility under Internal Tank Turbulence
✓ Easy Alignment of Sump and Outlet Nozzle During Installation
✓ Accommodates Lateral Floating Roof Movement
✓ NBR / Viton / Engineering Rubber Seal
✓ Suitable for High-Pressure / High-Temperature Conditions
✓ Refinery & Petrochemical Product Applications
✓ All Assemblies Inspected, Measured & Tested
PRODUCT CONFIGURATION
Drain System Components · Main Configuration
The articulated system is available in 3, 4, 6 and 8 inch pipe diameters, with joint durability engineered from long-term technical and field experience.
3+1 Articulated Type Roof Drain System
The system combines Steel Pipe with Mechanical Joints (Flexible Swing Joint and Swivel Joint) and is designed to withstand forces under diverse operating conditions.
Flexible Swing Joint
The patented WBI Twin Access Type Seal Drain System provides movement similar to a rubber hose.
Swivel Joint
A fully sealed joint for submerged-liquid service such as articulated Pipe Drain systems.
Check Valve
WB Float Check Valve design for preventing Drain Pipe overflow.
Hose Type Roof Drain
A Smooth Bore internal flow path and flexible Hose support rapid rainwater drainage while reducing internal tank interference.
ARTICULATED DRAIN
3+1 Articulated Drain System Configuration
The articulated drain system combines Steel Pipe and Mechanical Joints to accommodate vertical and lateral Floating Roof movement and internal tank turbulence. Configurations are available with 3, 4, 6 and 8 inch piping, Flexible Swing Joints and Swivel Joints.
TECHNICAL DATA
Roof Drain System Key Technical Conditions
Operating, configuration and quality conditions are summarized in the technical table.
| Item | Description |
|---|---|
| Main Configuration | Steel Pipe + Flexible Swing Joint + Swivel Joint |
| Pipe Diameter | 3 / 4 / 6 / 8 inch |
| Seal | NBR / Viton / Engineering Rubber |
| Design Purpose | Maintain Floating Roof buoyancy and discharge rainwater outside the tank |
| Application | Refinery / Petrochemical / Submerged Liquid Service |
| Installation Characteristics | Easy Sump / Outlet Nozzle alignment; accommodates lateral roof movement |
| Hose Type | Smooth Bore Inner Fluid Way / repeatable laydown pattern considered |
| Quality Control | All assemblies are inspected, measured and tested before supply |
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