High-Performance Sealing Solutions for Sulzer SALOMIX® SL Mixers: FBU 2450 & 2451

In the demanding environment of the pulp and paper industry, agitator reliability is critical. FBU Sealing Technologyprovides engineered mechanical seal alternatives specifically designed for Sulzer SALOMIX® SL series mixers. Our 2450 (Double) and 2451 (Single) series offer a robust, drop-in replacement that ensures leak-free operation in harsh slurry and chemical applications.

Why Choose FBU 2450 Double Mechanical Seals for Your Agitators?

The FBU 2450 Series is a double-balanced mechanical seal engineered for the extreme conditions found in pulp mill agitators and chemical processing tanks. Whether you are operating top-entry or side-entry agitators, the 2450 provides a superior barrier against abrasive media.

1. Stationary Pusher Seal Design

Unlike rotating seals that can be affected by centrifugal forces and misalignment, our stationary pusher seal design remains stable. This is particularly advantageous for large-diameter shafts or high-speed applications where stability is paramount.

2. Advanced Multi-Spring Structure

The 2450 features a multi-spring setup where the springs are protected from the process media. Crucially, the axial movement of the shaft does not affect the spring load, ensuring constant face pressure even during the hydraulic surges common in slurry mixing.

3. Dual-Balanced Feature for Maximum Versatility

The dual-balanced design is a "safety first" feature. It allows the 2450 to operate as a pressurized double mechanical seal (using Plan 53 or 54) or as an unpressurized dual seal device. This flexibility allows plants to standardize their inventory across different pumping and mixing systems.

Technical Specifications & Performance

Our seals are manufactured to meet or exceed OEM standards, ensuring full dimensional compliance with the Sulzer SALOMIXTM SL series.

Dimensional Compliance

• Shaft Diameters: Available for standard sizes including 45mm, 58mm, 77mm, 108mm, and other custom sizes upon request.

• Compatibility: Direct fit for Sulzer SALOMIX SL mixer chambers.

Performance Limits

Recommended Piping Plans

To optimize seal life, we recommend the following API piping plans for seal water control:

• Plan 54 (FBU GLD): External source for clean seal water (Highly Recommended).

• Plan 52, 53A, 53B, 53C: For pressurized or unpressurized barrier fluid systems.

Typical Industrial Applications

The FBU 2450 and 2451 series are built for "dry goods" reliability in:

• Pulp & Paper: Pulp mill agitators, stock chests, and bleaching towers.

• Mining & Slurry: Handling abrasive solids and high-viscosity fluids.

• Chemical Processing: Solvent and oil mixing involving side-entry or top-entry agitators.

FAQ

1: Can the FBU 2450 replace the original Sulzer SALOMIX SL seals without modifications?

Yes. The FBU 2450 is designed with full dimensional compliance. It is a drop-in replacement for the SL series mixers, covering standard shaft diameters like 45mm, 58mm, 77mm, and 108mm. No modifications to the agitator housing or shaft are required.

2: Why is the stationary design better for pulp and paper applications?

In pulp and paper, the media often contains fibers and abrasive particles. A stationary seal design keeps the springs out of the product, preventing "clogging" or "hang-up" that often causes rotating seals to fail prematurely.

3: What is the benefit of the multi-spring structure not being affected by axial movement?

Agitators often experience shaft deflection or axial float due to the weight of the impellers and the turbulence of the media. In our 2450 design, the spring load remains constant regardless of this movement, which prevents face opening and leakage.

4: Is Plan 54 mandatory for the 2450 double seal?

While Plan 54 (external seal water) is highly recommended for harsh slurry applications to keep the seal faces clean and cool, the 2450’s double-balanced design also allows for Plan 53 (A/B/C) pressurized barrier systems depending on your plant’s infrastructure.

5: What materials are available for corrosive media?

Our standard construction is 316 Stainless Steel, but for more aggressive environments, we offer Duplex Steel and other high-alloy materials to ensure chemical compatibility and longevity.

Interested in upgrading your Sulzer mixer reliability? Contact the FBU Technical Team today for a technical audit or a quote on the 2450/2451 series.