Amarex KRT

Summary

Product identification

The KSB Amarex KRT is a fully floodable submersible motor pump, operating at 50 Hz.

The designation follows a key, for example: Amarex KRT K 150-503/155 4 UN G-D IE3.

• Type series: Amarex KRT
• Impeller type: K (Closed multi-channel impeller), S/S-max (Impeller with cutter), F/F-max (Vortex impeller), E/E-max (Closed single-channel impeller), D/D-max (Open, diagonal single-vane impeller / open, radial multi-vane impeller)
• Nominal discharge nozzle diameter: 150 mm (example)
• Maximum nominal impeller diameter: 503 mm (example)
• Motor size: 155 (example)
• Number of motor poles: 4 (example)
• Motor version: UN/UE (Non-explosion-proof, up to 40 °C fluid temp), UF (Non-explosion-proof, up to 40 °C fluid temp, 55 °C ambient temp), WN/WE (Non-explosion-proof, up to 60 °C fluid temp), XN/XE (Explosion protection II2G Ex db h IIB T3 Gb, up to 40 °C fluid temp), XF (Explosion protection II2G Ex db h IIB T3 Gb, up to 40 °C fluid temp, 55 °C ambient temp), YN/YE (Explosion protection II2G Ex db h IIB T4 Gb, up to 40 °C fluid temp), ZN/ZE (Explosion protection II2G Ex db h IIB T3 Gb, up to 60 °C fluid temp)
• Material variant: G (Standard, grey cast iron), G1 (Like G, impeller duplex stainless steel), G2 (Like G, impeller white cast iron), GH (Like G, impeller and discharge cover white cast iron), H (Wetted components white cast iron), C1 (Wetted parts duplex stainless steel, elastomer bellows mechanical seal, A4 bolts/screws), C2 (Wetted parts duplex stainless steel, covered spring mechanical seal, 1.4462 bolts/screws)
• Installation type: D (Stationary dry, vertical), H (Stationary dry, horizontal), K (Stationary wet, guide wire/rail), S (Stationary wet, submerged motor, guide wire/rail), P (Wet, transportable, submerged motor)
• Motor efficiency classification: IE3 (Premium Efficiency) or blank (No efficiency classification)

Operating limits

• Flow rate (Q):
  • ≤ 10080 m³/h
  • ≤ 2800 l/s
• Head (H): ≤ 120 m
• Fluid temperature (T): ≤ +60 °C
• Motor rating (P2): 0.8 - 850 kW
• Immersion depth: ≤ 30 m
• Minimum flow velocity in vertical risers: 1.2 m/s (for DN 100) to 2.4 m/s (for DN 1000)
• Minimum circumferential speed of impeller: 12 m/s (except for F impellers)
• Motor power reserve (recommended):
  • P2 ≤ 30 kW: 10% (Mains operation), 15% (With frequency inverter)
  • P2 > 30 kW: 5% (Mains operation), 10% (With frequency inverter)
  • For installation types D and K (with cooling jacket) with motors UN/XN/YN, an additional 1.5 kW must be added for the cooling circuit.

Feed water

Main applications:

• Waste water management
• Service water supply systems
• Disposal
• Waste water treatment plants
• Sludge disposal

Fluids handled:

• Waste water with faeces
• Activated sludge
• Digested sludge
• Raw sludge
• Gas-containing liquids
• Industrial waste water

Overview of fluids handled (selection aid for materials and hydraulic systems):

• Grey water, River water, Stormwater: Recommended material variant G; Impeller types K/K-max, D/D-max, E/E-max, F/F-max. Comments: Free passage > any solids contained, possibly pre-screened.
• Untreated municipal waste water: Recommended material variant G; Impeller types F/F-max, S/S-max, D/D-max, E/E-max, K/K-max. Comments: ATV recommends a free passage of 100 mm; minimum free passage: 76 mm.
• Waste water containing air and gas: Recommended material variant G; Impeller type F/F-max. Comments: Up to 8%, contact KSB for fluids with high outgassing rates.
• Sludges (Raw, Digested, Activated): Recommended material variant G; Impeller types F/F-max, D/D-max, E/E-max, K/K-max. Pumpable up to a dry substance content of: 13% (D), 8% (F/D-max), 6% (E), 5% (K).
• Industrial waste water containing:
  • Paint suspensions: G, K/K-max (solvent-free).
  • Lacquer/paint/varnish suspensions: G, F/F-max, E/E-max (solvent-free, contact KSB for silicone-free version).
  • Fibrous material: G, F/F-max, S/S-max, D/D-max.
  • Chips/swarf, Abrasive substances: G2 / GH, K/K-max, F/F-max. Comments: Solids content < 5 g/l, special mechanical seal.
• Mildly acidic industrial waste water: C, K/K-max, F/F-max. Comments: pH ≥ 6.5, material variant C1 and FPM (Viton) O-rings.
• Neutral non-corrosive waste water (e.g., Ammonium hydroxide, Urea, Potassium hydroxide, Calcium hydroxide, Sodium hydroxide, Sodium carbonate): G, K/K-max.
• Neutral, non-corrosive waste water containing Aliphatic hydrocarbons: G, K/K-max.
• Neutral, non-corrosive waste water containing Aromatic hydrocarbons, Chlorinated hydrocarbons: G, K/K-max. Comments: FPM (Viton) O-rings.
• Highly abrasive industrial waste water (chemically neutral): GH / H, K/K-max, F/F-max. Examples: Water containing iron ore sinter, Lime milk containing quartz and pigment suspensions, Wash water containing solids, Waste water containing dust or ash, Water/sand mixture. Material selection depends on content and operating conditions.
• Seawater: C, K/K-max, F/F-max. Comments: Material variant C2 ≤ 25 °C fluid temperature.
• Brackish water: G1 / C1, K/K-max, F/F-max. Comments: Material variant C1 or G1 (with 250 µm two-component epoxy resin), depending on salt content.
• Corrosive industrial waste water: C, K/K-max, F/F-max. Comments: Material variants C1 or C2, depending on fluid analysis.

Electrical

• Drive: Three-phase asynchronous squirrel-cage motor
• Type of protection: Ex db IIB (applies to explosion-proof pump sets only)
• Enclosure: IP68 to EN 60529/IEC529
• Motor efficiency classification: IE3 (Premium Efficiency)
• Starting method: DOL / star-delta (690 V only DOL), depending on motor size and voltage.
• Voltage: 400 V / 380 V / 415 V / 500 V / 690 V (some optional)
• Cooling: Cooled by surrounding fluid / air cooling (optional for some motors) / with cooling jacket (optional for some motors)
• Power cable:
  • Types: S1BN8-F rubber-sheathed cable (Standard), S07RC4N8-F rubber-sheathed cable (Optional), TEHSITE Tefzel cable (Optional)
  • Rated voltage: 1000 V (S1BN8-F), 750 V (S07RC4N8-F, TEHSITE)
  • EMC screening: S07RC4N8-F has EMC screening.
  • Insulation material: EPR (S1BN8-F, S07RC4N8-F), ETFE (TEHSITE)
  • Max. continuous temperature of insulation: 90 °C (EPR), 135 °C (ETFE)
  • Length: 10 m / ≤ 40 m (optional)
  • Cable entry: Absolutely water-tight
• Monitoring equipment:
  • Winding temperature: Temperature switches (bimetal) in the winding (for versions U, W, X, Y, Z); PTC thermistors for explosion protection (for versions X, Y, Z).
  • Coolant temperature (installation types D, K): PTC thermistor.
  • Bearing temperature: Pt100 resistance thermometer (pump end, drive end, optional for some configurations).
  • Leakage in the motor space: Leakage sensor.
  • Mechanical seal leakage: Float switch in leakage area (for some motor types).
  • Vibration sensor: Internal vibration sensor (optional).

Mechanical / hydraulic

• Design:
  • Fully floodable submersible motor pump
  • Not self-priming
  • Close-coupled design
• Shaft seal:
  • Two bi-directional mechanical seals in tandem arrangement with liquid reservoir, with leakage chamber on some models.
  • Double cartridge seal with leakage chamber.
  • Specific types available per motor design and material variant: Mechanical seal with elastomer bellows, Double cartridge mechanical seal, Pump-end mechanical seal with covered spring, Stationary mechanical seal with spring outside of fluid handled.
• Impeller types:
  • S/S-max (Impeller with cutter): For fluids containing coarse substances and/or long fibres (e.g., domestic waste water, grey water, waste water with faeces).
  • F/F-max (Free-flow impeller / Vortex impeller): For fluids containing solids and stringy material, as well as fluids with entrapped air or gas (e.g., activated sludge, digested sludge, raw waste water, raw sludge).
  • E/E-max (Closed single-channel impeller): For fluids containing solids and stringy material (e.g., activated sludge, digested sludge, raw waste water, raw sludge).
  • D (Open, diagonal single-channel impeller): For fluids containing solid substances and long fibres (e.g., activated sludge, digested sludge, raw waste water, raw sludge).
  • D-max (Open radial multi-vane impeller): For fluids containing solid substances and long fibres (e.g., activated sludge, digested sludge, raw waste water, raw sludge).
  • K/K-max (Closed multi-channel impeller): For contaminated, solids-laden, non-gaseous fluids without stringy material (e.g., activated sludge, landfill waste water, industrial waste water, stormwater).
• Bearings:
  • Drive end: Grease-packed bearings sealed for life, maintenance-free.
  • Pump end: Standard bearings (grease-packed, sealed for life, maintenance-free) or Reinforced bearings (grease-lubricated, can be re-lubricated).
• Materials:
  • Pump casing: EN-GJL-250, EN-GJN-HB555, 1.4517
  • Wear plate: EN-GJL-250, EN-GJN-HB555
  • Discharge cover: EN-GJL-250, EN-GJN-HB555, 1.4517
  • Shaft: 1.4021, 1.4462, C45+N
  • Impeller: EN-GJL-250, 1.4517, EN-GJN-HB555
  • Bearing housing: EN-GJL-250, 1.4517
  • O-ring: Nitrile butadiene rubber (NBR), Viton (FKM)
  • Mechanical seal (drive end): Carbon/SiC
  • Mechanical seal (pump end): SiC / SiC
  • Casing wear ring: EN-GJL-250, VG 434
  • Cooling jacket: 1.4571
  • Motor housing: EN-GJL-250, 1.4517
  • Bolts/screws: A4 (corresponds to 1.4571), 1.4462
  • Installation parts (e.g., Guide wire suspension bracket, Guide wire, Flanged bend, Claw, Lifting chain/rope, Foot plate/feet, Mounting bracket): Various materials including 1.4571, 1.4401, EN-GJL-250, EN-GJS-400-15/EN-GJS-500-7, 1.0038 + Z, polyamide, polypropylene.
• Coating: Environmentally friendly KSB standard coating (RAL 5002) / 250 µm, 2-component epoxy coating (optional); C1, C2 variants without coating.
• Technical data (Impeller details and pressures):
  • Impeller channels: 1, 2, 3, 4
  • Free passage: Ranges from 4 mm to 190 mm
  • Max. impeller diameter: Ranges from 180 mm to 908 mm
  • Min. impeller diameter: Ranges from 130 mm to 760 mm
  • Max. operating pressure: Ranges from 1.7 bar to 13 bar (for installation types D, H, K, S, P)
  • Max. test pressure: Ranges from 2.2 bar to 19.5 bar (for installation types D, H, K, S, P)
  • See the official PDF for exact tabulated values for specific pump sizes and material variants.
• Moments of inertia (J):
  • Impeller: Ranges from 0.018 kgm² to 50 kgm² (data applies to maximum impeller diameter and impeller with water fill).
  • Motor: Ranges from 0.002 kgm² (3 2 E motor) to 56.34 kgm² (850 6 N motor).
  • See the official PDF for exact tabulated values for specific pump sizes, impeller types, material variants, and motor types.

Disclaimer

This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the official OEM PDF datasheet. For contractual data and complete product information, always refer to the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror