FGD Slurry Pumps — Corrosion & Wear Resistant Desulfurization Duty

Combined wear and corrosion duty — where the medium attacks the matrix between the hard carbides, a material chosen on hardness alone fails quickly. Selection follows pH first, abrasion second.

• A49 (≥600 MPa, HRC43) — low-pH duty at pH ≥4, flue gas and desulphurisation
• A33 (HRC35) — oxidising slurry at pH ≥1, phosphogypsum and mineral acids
• A25 (HB300–350) — weldable, allows on-site repair of large castings
• Rubber and polyurethane wet ends for fine high-concentration slurry
• Ceramic (silicon carbide) supplied as a separate pump series

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CE · EAC · ISO 9001 · ISO 14001 · ISO 45001

Overview

Corrosion and wear together are a harder problem than either alone. A material chosen purely for hardness fails quickly when the medium is acidic, because corrosion attacks the matrix between the hard carbides and the carbides are then lost mechanically. Our anti-wear anti-corrosive grades are formulated for that combined attack, and the selection follows the pH of the medium first and the abrasion second.

Grades for Combined Wear and Corrosion

Impact toughness (αk) values are confirmed at quotation. Grade availability varies by component and pump series.

Selecting by pH

• pH 5–12 — A05 high-chrome white iron. The medium is not aggressive enough to require a corrosion-specific grade.
• pH ≥4 — A49 (≥600 MPa, HRC43). Erosion resistance with corrosion resistance in low-pH service, specifically suited to flue gas and desulphurisation duty.
• pH ≥1 — A33 (HRC35). For oxidising slurry including phosphogypsum and nitric, sulphuric and phosphoric acid media.
• Weldable requirement — A25 cast steel (HB300–350), lower hardness but good combined resistance and weldable for repair.

Non-Metallic Options

• Rubber — wear and corrosion resistant elastomer wet ends for fine, high-concentration slurry without sharp angular particles. Corrosion resistance is inherent rather than dependent on a passive layer, which is an advantage in acidic duty.
• Polyurethane — for fine abrasive slurry in sliding-wear duty.
• Ceramic (silicon carbide) — for strong wear combined with corrosion. Ceramic wet ends are supplied as a separate pump series rather than as a liner option in the standard range, because the construction differs.

What to Send Us

The medium pH and temperature, the particle size distribution and solids concentration, and — most useful of all — the failed part and where it failed. Corrosion-assisted wear leaves a different surface from pure abrasion, and identifying which mechanism dominated usually changes the grade recommendation.

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