In the demanding environment of pulp and paper mills, pump reliability is dictated by the performance of its seal. For those operating Sulzer® APP, APT, or NPP series centrifugal pumps, finding a seal that can handle high-stock consistency without the premium OEM price tag is a constant challenge.

FBU’s 2000 Series Cartridge Seals are specifically engineered as a high-performance, "drop-in" replacement for Sulzer® equipment. By integrating advanced clogging-resistance technology, the 2000 series helps plants extend MTBR (Mean Time Between Repairs) and reduce maintenance costs.

1. Why the FBU 2000 Series is the Superior Choice for Sulzer® Pumps

The FBU 2000 series is not just a generic alternative; it is a dedicated sealing line for the Pulp & Paper industry. Here is why it excels in Sulzer® APP11 through APP61 models:

Integrated Cartridge Design: The 2000 series (including the 2210 and 2220 models) features a robust cartridge construction that eliminates installation errors and ensures perfect axial alignment on the Sulzer shaft.

Abrasive Handling Capability: Designed to manage high-consistency pulp and abrasive slurries, the 2000 series uses specialized face geometries and materials that resist the "sandpaper effect" of paper stock.

Global Compatibility: These seals are 100% dimensionally compatible with original Sulzer® stuffing box dimensions, requiring zero modifications to your existing pump hardware.

7-Day Rapid Response: Our Quality & Speed Service (QSS) ensures that standard 2000 series seals for Sulzer® pumps are shipped within 7 days.

2. Solving Common Sealing Challenges in Sulzer® APP/APT Pumps

Challenge: Clogging and Scaling in Heavy Stock

Standard seals often fail because pulp fibers or chemical additives clog the springs or bellows, leading to seal "hang-up."

FBU 2000 Series Solution: The 2000 series features an isolated spring design. By moving the springs out of the process fluid, we prevent fibers from obstructing the seal's movement, ensuring consistent face contact even in thick slurry.

Challenge: Premature Failure During Pressure Surges

Sulzer® pumps often experience pressure fluctuations during start-ups or valve adjustments.

FBU 2000 Series Solution: Our 2000 series utilizes Hydraulic Balancing. This technology minimizes the closing force on the faces, reducing friction and heat buildup during pressure spikes, which prevents thermal cracking of the SiC faces. 

3. Product Spotlight: FBU 2000 Series for Sulzer® Equipment

FAQ

1: Which FBU 2000 series model is best for a Sulzer® APP32-150 pump handling 4% consistency pulp?

For 4% stock, we typically recommend the FBU 2210 or 2220 series. These are heavy-duty cartridge seals designed to handle the solids without the need for excessive flush water, provided the correct API plan is in place.

2: Can the FBU 2000 series handle chemical pulping liquors (White/Black Liquor)?

Yes. We offer the 2000 series with various elastomer options (like FFKM) and high-grade metallurgy (Duplex SS or Hastelloy) to resist the corrosive nature of cooking liquors used in Sulzer® pump applications.

3: How do I transition from my current OEM seal to an FBU 2000 series?

The transition is seamless. Because the 2000 series is a "drop-in" replacement, you simply remove the old OEM seal and slide on the FBU cartridge. No shaft sleeves need to be replaced, and no boring of the seal cover is required.

Contact our Pulp & Paper Technical Desk:

Send us your pump model or the Sulzer® part number, and our engineers will provide a technical quote and seal optimization plan within 24 hours.