Introduction: The Critical Role of Waterproof Casings
When pipelines pass through concrete walls in basements, water tanks, or sewage treatment plants, they create a potential leakage path. Standard cementing is not enough; thermal movement and settling will inevitably cause cracks. The 02S404 Flexible Waterproof Casing is the engineered solution, designed to create a dynamic, robust, and permanent seal.
1. Anatomy of the 02S404 Flexible Design
The primary distinction of the VSSJAF (VSSJAF-1/CF) flexible model from a rigid casing is its ability to accommodate movement.
The Sealing Ring & Follower Flange: This system compresses a multi-layer rubber gasket (EPDM or NBR) against the carrier pipe. This creates a flexible interface that remains watertight even if the pipe vibrates or shifts slightly due to seismic activity.
The Internal Limit Ring: Integrated into the casing body, this ring prevents the carrier pipe from pulling out of the seal under extreme axial stress, protecting the integrity of the penetration.
2. Applications: Where Flexibility is Mandatory
B-NAI’s 02S404 casings are specifically demanded in projects with high hydro-static pressure or potential for vibration:
Pump Rooms & Mechanical Spaces: Absorbing equipment vibration before it damages the wall.
Water Storage Tanks & Pools: Ensuring a seamless seal that withstands constant water pressure.
Civil Defense Engineering : Meeting strict national standards for structural blast resistance and sealing.
3. The B-NAI Quality Advantage
Our 02S404 casings are not standard pipe segments; they are precision-fabricated components. We use full-thickness steel, expert welding, and a rigorous Fusion Bonded Epoxy (FBE) coating process (minimum 250 microns) to ensure a service life that matches the concrete structure.
