ILN

Summary

Product identification

The KSB ILN / ILNC / ILNR series consists of vertical in-line centrifugal pumps with shaft seals.

• Pump types:
  • ILN: Long-coupled in-line pump
  • ILNC: Close-coupled in-line pump
  • ILNR: Long-coupled in-line pump, additional sizes
• Design:
  • Vertical installation
  • Single-stage
  • Radially split volute casing with integrally cast pump feet
  • Replaceable casing wear rings
  • Mechanical seal
  • Closed radial impeller
• Priming system options: Without priming system, with auxiliary pump (S), or with ejector (E).

Main applications

• Heating systems
• Cooling circuits
• Air-conditioning systems
• Marine applications
• Service water supply systems
• Water supply systems
• Cleaning systems
• Industrial recirculation systems

Operating limits

Operating data

ILN operating data (50 Hz / 60 Hz)

• Flow rate Q: ≤ 3310 m³/h / ≤ 3700 m³/h
• Head H: ≤ 112 m / ≤ 162 m
• Fluid temperature Tmin.: ≥ -20 °C
• Fluid temperature Tmax.: ≤ +70 °C
• Operating pressure p: ≤ 16 bar
• Speed n: ≤ 3000 rpm / ≤ 3600 rpm

ILNC operating data (50 Hz / 60 Hz)

• Flow rate Q: ≤ 370 m³/h / ≤ 447 m³/h
• Head H: ≤ 112 m / ≤ 161 m
• Fluid temperature Tmin.: ≥ -20 °C
• Fluid temperature Tmax.: ≤ +70 °C
• Operating pressure p: ≤ 16 bar
• Speed n: ≤ 3000 rpm / ≤ 3600 rpm

ILNR operating data (50 Hz / 60 Hz)

• Flow rate Q: ≤ 1600 m³/h / ≤ 2000 m³/h
• Head H: ≤ 93 m / ≤ 85 m
• Fluid temperature Tmin.: ≥ -15 °C
• Fluid temperature Tmax.: ≤ +70 °C
• Operating pressure p: ≤ 10 bar
• Speed n: ≤ 1450 rpm / ≤ 1750 rpm

Pressure limits

Maximum operating pressure varies by pump type and size:

• ILN: Ranges from 6 bar to 16 bar. For material variants AB, D1, and D2, max. operating pressure is 10 bar for sizes 250-200-330 and 300-250-330.
• ILNC: Ranges from 10 bar to 16 bar.
• ILNR: All listed sizes have a maximum operating pressure of 10 bar.

See the official PDF for exact tabulated values for each specific pump size.

Feed water

Fluids handled

• Brackish water
• Service water
• River water, lake water and groundwater
• Heating water
• Industrial service water
• Cooling water
• Fire-fighting water
• Seawater
• Cleaning agents
• Swimming pool water
• Brine
• Boiler feed water
• Drinking water
• High-temperature hot water
• Wash water
• Hydrocarbons (Consult KSB)

Electrical

Drive

• Motor type: Surface-cooled IEC three-phase motor
• Type of construction: IM V1
• Frequency: 50 Hz / 60 Hz
• Enclosure: IP55
• Voltage: 230/400 V and 400/690 V
• Automation options: PumpDrive, PumpMeter. Consultation with KSB is required for operation on a frequency inverter.
• Motor efficiency: Classified as IE1, IE2, IE3, IE4, or No classification.

Mechanical / hydraulic

Design details

• ILN: In-line design, vertical installation, single-stage, single-suction or double-suction (for sizes 350-300-330 and 500-400-430), coupling between pump and motor, spacer bush (except for 350-300-330 and 500-400-430).
• ILNC: Close-coupled design / in-line design, vertical installation, single-stage, single-suction.
• ILNR: In-line design, vertical installation, single-stage, single-suction, coupling between pump and motor.

Bearings

• ILN: Upper bearing is a closed deep groove ball bearing, greased for life. Lower bearing is a closed deep groove ball bearing or closed double-row angular contact ball bearing, greased for life. Sizes 350-300-330 and 500-400-430 use plain bearings for the upper bearing.
• ILNC: Closed deep groove ball bearing or closed double-row angular contact ball bearing, greased for life. Bearing design depends on motor size.
• ILNR: Upper bearing is a closed deep groove ball bearing or closed double-row angular contact ball bearing, greased for life. Lower bearing is a closed deep groove ball bearing, greased for life.

Materials

Overview of available materials for key components:

• Volute casing (102): EN-GJL-250, CC491K-GS, CC333G-GS, A995 Gr. 1 B, A995 Gr. 5 A
• Casing cover (161): EN-GJL-250, CC491K-GS, CC333G-GS, A995 Gr. 1 B, A995 Gr. 5 A
• Pump stool (181): EN-GJL-250 (C-15 for specific ILN sizes)
• Shaft (210): 1.4404/1.4462, 1.4501/UNS S32760 (specific variants for certain ILN/ILNC sizes)
• Impeller (230): CC480K-GS, CC333G-GS, A890 Gr. 1 B, A890 Gr. 5 A
• Drive lantern (341): Steel
• Gasket (400): DPAF
• O-ring (412): NBR 70
• Casing wear ring (502): CC493K-GC, A890 Gr. 1 B, A890 Gr. 5 A
• Hexagon head bolt (901): 8.8, A4-70
• Screw plug (903): 11SMNPB30+C, AISI 316, 1.4410 / 1.4501
• Impeller nut (922): Steel, 1.4404 / AISI 316 L, 1.4462, 1.4410/1.4501
• Key (940): 1.4571+C, 1.4462, 1.4501

Technical data (Impeller and Bearings)

Detailed technical data including bearing sizes, impeller outlet width, impeller inlet diameter, and maximum/minimum impeller diameter are provided for each pump size in the ILN, ILNC, and ILNR series.

See the official PDF for exact tabulated values for each specific pump size.

Dimensions and connections

Detailed pump dimensions (C, G, A, B1, B2, B3, L1, L2, L3, L4, S, E, F, H1, H2) are provided for various ILN, ILNC, and ILNR sizes, along with nominal suction (DNs) and discharge (DNd) nozzle diameters.

See the official PDF for exact tabulated values and dimension drawings for each specific pump size.

Pump connections

• 1M.1: G 1/4 Pressure gauge
• 6B: G 1/4 Fluid drain
• 5B: G 1/4 Vent, mechanical seal chamber
• 1M.2: G 1/4 Pressure gauge (optional)
• 6D: G 3/4 Venting / priming

Flange design

Flange design varies by material variant and nominal diameter:

• GB: EN 1092-2, Pressure class ≤ DN 150: PN 16, > DN 150: PN 10
• B: EN 1092-3
• AB: EN 1092-3
• D1: EN 1092-1
• D2: EN 1092-1

Product benefits

• Hydraulic characteristics optimized for excellent efficiency and NPSH.
• Operating costs reduced by impeller trimming and hard-wearing design.
• Reliable casing seal with O-ring or confined casing gasket.
• Maintenance-free with grease-packed bearings sealed for life.
• Long service life of mechanical seal due to continuous venting.
• Vertical design with small footprint and space-saving in-line design.
• Service-friendly with easy-to-replace casing wear rings.
• Flexible coupling for easy drive mounting (ILN and ILNR variants).
• High stability and flexibility with baseplate that can be turned in steps of 90° (ILN up to 150/400 and ILNC).
• Automatic priming by auxiliary pump or ejector (S/E variants).

Recommended spare parts stock

Recommended spare parts lists are provided for commissioning/start-up, 2 years’ operation, and 5 years’ operation, including components like gaskets, O-rings, mechanical seals, bearings, casing wear rings, shafts, and impellers. Additional spare parts are listed for auxiliary vacuum pump design variants (ILNS and ILNCS).

See the official PDF for detailed lists and quantities.

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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)

Lenntech datasheet mirror