HPK L

Summary

Product identification

The HPK-L is a centrifugal pump with a shaft seal, designed for handling hot water and organic or synthetic heat transfer fluids in piping or tank systems.

Main applications:

• Heating systems
• Forced circulation boilers
• District heating
• Heat transfer systems

Design details:

• Volute casing pump
• Horizontal installation
• Back pull-out design
• Single-stage
• Technical requirements to ISO 5199
• Dimensions and ratings to ISO 2858, complemented by pumps of nominal sizes DN 25, DN 200 and above.

Operating limits

Operating properties:

• Flow rate (Q):
  • 50 Hz: ≤ 1160 m³/h
  • 60 Hz: ≤ 1400 m³/h
• Head (H):
  • 50 Hz: ≤ 162 m
  • 60 Hz: ≤ 233 m
• Fluid temperature (T):
  • Variant S/Z: ≥ -40 °C to ≤ +350 °C
  • Variant E/Y: ≥ -40 °C to ≤ +400 °C
• Operating pressure (p):
  • Variant E/S: ≤ 25 bar
  • Variant Y/Z: ≤ 40 bar

Speed limits:

• Minimum: 800 rpm
• Maximum: 3600 rpm

Pressure and temperature limits: See the official PDF for the graphical representation of pressure and temperature limits for variants E, Y, Z, and S.

Feed water / Product water

Fluid handled:

• Hot water
• Heat transfer fluids

Electrical

Motor rating (PN):

• From 0.75 kW to 132.00 kW (as per designation key)

Drive:

• Surface-cooled IEC frame three-phase squirrel-cage motor

Automation (Europe only):

• PumpDrive

Mechanical / hydraulic

Pump casing:

• Single or double volute, depending on pump size
• Radially split volute casing
• Volute casing with integrally cast pump feet
• Replaceable casing wear rings

Shaft seal:

• KSB mechanical seal, optimized for HPK-L, with integrated shaft sleeve (standard Europe)
• Optional commercial single mechanical seals with replaceable shaft sleeve (standard Asia/Americas)
• Versions with two mechanical seals can be supplied for heat transfer applications.

Impeller type:

• Closed radial impeller with multiply curved vanes

Bearings:

• Version with single mechanical seal:
  • Radial bearing: plain bearing, product-lubricated
  • Fixed bearings: two angular ball bearings, grease-packed
• Version with two mechanical seals:
  • Radial bearing: plain bearing, product-lubricated
  • Fixed bearing: one deep groove ball bearing or one four-point bearing (depending on pump size), grease-packed

Bearing bracket designation:

• Code: CS (Bearing bracket) + Size (e.g., 50)
• Specific bearing types (e.g., SSiC plain bearings, 2x7307 ball bearings) are tabulated by bearing bracket size (CS40, CS50, CS60, CS80) in the official PDF.

Materials: Available materials for various components (Volute casing, Casing cover, Impeller, Shaft, Shaft sleeve, Bearing bracket, Support foot, Casing wear ring, Impeller wear ring, Impeller nut, Gasket) are detailed in tables for Europe and Asia in the official PDF. Examples include GP240GH+N, 1.7706, EN-GJS-400-18-LT, P250GH/1.7335/P355NL1, EN-GJL-250, 1.4408, 1.4021+QT800, AISI316, CrNi graphite 1G, A216 Gr WCB, A48CL35B, A276 Type 410 COND. H.

Flange design:

• Material E/S:
  • Standard: EN 1092-1
  • Pressure class: PN 25
  • Drilled to ASME B16.5 Class 300 (not possible for size 100-065-125)
• Material Y/Z:
  • Standard: EN 1092-1
  • Pressure class: PN 40
  • Drilled to ASME B16.5 Class 300

Connection types: Various connection types are available for pressure gauges, temperature measuring instruments, fluid drains, leakage drains, auxiliary connections, vent plugs, quench fluid IN/OUT, and vibration measurement. Connection threads vary by region (Europe: G, R; Asia/Americas: NPT) and discharge nozzle size (≤ DN 50, DN 65-DN 80, ≥ DN 100). See the official PDF for exact tabulated values.

Dimensions: Detailed pump dimensions (DN1, DN2, a, b, c, f, g1, g2, h1, h2, m1, m3, n1, n3, n5) and dimensions of shaft end and foot bolts (d1, l, t, u, y, i1, i2, m2, n2, n4, s1, s2, v, w) are provided in extensive tables in the official PDF.

Product benefits

• Low temperature in the mechanical seal chamber; no cooling water required due to air-cooled bearing bracket with heat barrier.
• Increased operating reliability for heat transfer applications by an optional two mechanical seals preventing leakage.
• Higher efficiencies than the previous HPK-L model due to continued development of the flow passage within the hydraulic system.
• Optimized venting of mechanical seal chamber by patented VenJet profile.

Scope of supply

Depending on the model, the following items are included:

• Pump
• Drive
• Flexible coupling with or without spacer
• Coupling guard
• Baseplate:
  • Europe: To ISO 3661, cast or welded, for pump and motor, in torsion-resistant design (Channel section steel or folded steel plate).
  • Asia/Americas: To local KSB standard.
• Special accessories (as required).

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Disclaimer: This summary is based on extracted text and may miss figures, footnotes, or recent revisions present in the complete OEM PDF. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror