Sewabloc

Summary

Product identification

The KSB Sewatec / Sewabloc are dry-installed volute casing pumps designed for waste water applications, compatible with 50 Hz and 60 Hz systems and DIN / IEC motors.

• Sewatec: Volute casing pump, back pull-out design, single-stage.
• Sewabloc: Close-coupled pump with shaft seal, volute casing pump.

Designation Key Example: Sewatec K100-253G 3ENH 200L 4

• Sewatec or Sewabloc: Type series
• K: Impeller type (F/F-max: Vortex; E/E-max: Closed single-channel; D/D-max: Open diagonal single-vane / open radial multi-vane; K/K-max: Closed multi-channel)
• 100: Nominal discharge nozzle diameter [mm]
• 253: Nominal impeller diameter [mm]
• G: Material variant (G: Standard grey cast iron; G1: G with duplex stainless steel impeller; G2: G with white cast iron impeller; GH: G with white cast iron impeller and intermediate casing; GC: G with duplex stainless steel impeller and discharge cover)
• 3ENH: Installation type
• 200L: Motor size
• 4: Number of motor poles (2, 4, 6, 8, 10, 12)

Operating limits

• Flow rate (Q):
  • Impeller type F: ≤ 680 m³/h (≤ 189 l/s)
  • Impeller type E: ≤ 2520 m³/h (≤ 700 l/s)
  • Impeller type D: ≤ 1500 m³/h (≤ 450 l/s)
  • Impeller type K: ≤ 10000 m³/h (≤ 2775 l/s)
• Head (H):
  • Impeller type F: ≤ 80 m
  • Impeller type E: ≤ 50 m
  • Impeller type D: ≤ 80 m
  • Impeller type K: ≤ 115 m
• Fluid temperature (T): ≤ 70 °C (For Sewabloc with explosion protection, T ≤ 40 °C)
• Operating pressure (p): ≤ 10 bar (for all impeller types)
• Minimum flow velocity in vertical risers: Between 1.2 m/s (for nominal size 100) and 2.4 m/s (for nominal size 1000).
• Minimum circumferential speed of impeller: 12 m/s (except for F impellers, where lower speeds are permissible).

Feed water

The pumps are designed for waste water applications, handling a variety of fluids:

• Grey water
• Solids-laden river water
• Contaminated surface water
• Waste water with faeces
• Industrial waste water
• Gas-containing liquids
• Activated sludge
• Digested sludge
• Raw sludge

Recommended fluid properties and material variants:

• EN-GJL-250 grey cast iron (Material variant G): Suitable for neutral, slightly aggressive fluids with little wear. pH ≥ 6.5, sand content ≤ 0.5 g/l.
• Duplex stainless steel (1.4517 or equivalent, Material variant G1, GC, C): Resistant to cavitation, high strength, excellent resistance to pitting corrosion. Suitable for acidic waste water with high chloride content, seawater, brackish water, chemical waste water (pH 1–12).
• Wear-resistant white cast iron (EN-GJN-HB555 [XCR14] or equivalent, Material variant G2, GH, H): Rockwell hardness of at least 54 HRC. Suitable for highly abrasive fluids containing sand, ash, or iron ore sinter. pH ≥ 6.5.
• Sludge dry substance content:
  • Raw/Digested sludge: up to 13% (D impeller), 8% (F/D-max impeller), 6% (E impeller).
  • Activated sludge: up to 13% (D impeller), 8% (D-max impeller), 5% (K impeller).
• Gas-containing liquids: Up to 8% gas content for F/F-max impellers. Contact KSB for higher outgassing rates.
• Abrasive substances: Severe hydroabrasive wear occurs if solids contents of approx. 0.5 g/l or higher are combined with circumferential speeds exceeding 20 m/s or low-flow conditions.

Mechanical / hydraulic

Design Details:

• Shaft seal:
  • Sewatec (bearing brackets S01-S04) and Sewabloc: Two bi-directional mechanical seals in tandem arrangement, with liquid reservoir.
  • Sewatec (bearing brackets S05-S10): Two bi-directional mechanical seals in tandem arrangement, with liquid reservoir; Gland packing also available.
• Bearings:
  • Sewatec (S01-S04): Grease-packed, zero-maintenance deep groove ball bearings (sealed for life) on pump and drive end.
  • Sewatec (S05-S10): Grease-packed rolling element bearings with relubrication system on pump and drive end.
  • Sewabloc: Grease-packed, zero-maintenance deep groove ball bearing (sealed for life) on pump end.
• Impeller types: Various application-oriented impeller types are available:
  • F/F-max (Vortex impeller): Suitable for fluids containing solids, stringy material, and entrapped air/gas.
  • E/E-max (Closed single-channel impeller): Suitable for fluids containing solids and stringy material.
  • D/D-max (Open diagonal single-vane / open radial multi-vane impeller): Suitable for fluids containing solid substances and long fibres.
  • K/K-max (Closed multi-channel impeller): Suitable for contaminated, solids-laden, non-gaseous fluids without stringy material.

Materials:

The pumps are available in various material variants (G, G1, G2, GH, GC) with components made from:

• Pump casing: EN-GJL-250
• Wear plate: EN-GJL-250, EN-GJN-HB555 (XCR14)
• Discharge cover: EN-GJL-250, EN-GJN-HB555 (XCR14), 1.4517
• Shaft: 1.4021, 1.4462
• Impeller: EN-GJL-250, 1.4517, EN-GJN-HB555 (XCR14), EN-GJS-400
• Mechanical seal: SiC/SiC (Q1Q1 PGG)
• Sealing elements: NBR (Viton optional)
• Screws, bolts and nuts: Stainless steel (A4), CK 35N

Technical Data (General):

• Max. operating pressure: Up to 10 bar
• Max. test pressure: Up to 15 bar
• Impeller channels: 6, 7, 8, 10 (depending on size and type)
• Max. free passage: Up to 280 mm (varies significantly by model and impeller type)
• Max. impeller diameter: Up to 908 mm (varies significantly by model and impeller type)
• Min. impeller diameter: As low as 120 mm (varies significantly by model and impeller type)
• Torsional spring constant: Ranges from 13000 Nm/rad to 1400000 Nm/rad (varies by bearing bracket)

Specific impeller diameter and material variant availability for each pump size and bearing bracket are detailed in the official PDF. See the official PDF for exact tabulated values.

Electrical

• Motor poles: Available with 2, 4, 6, 8, 10, 12 poles.
• Motor power reserve:
  • For P₂ ≤ 30 kW (≤ 40 hp): 10% for mains operation, 15% with frequency inverter.
  • For P₂ > 30 kW (> 40 hp): 5% for mains operation, 10% with frequency inverter.
  • Larger reserves may be required by local regulations.

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Disclaimer This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the complete OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

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