Speck Hot Water Pumps D L

Summary

Product identification

• Type: HIGH-PRESSURE PLUNGER PUMPS FOR HOT WATER
• Description: SPECK TRIPLEX Plunger Pumps for operation with hot water are suitable for pumping condensate into steam boilers and for various fields of process technology where media are to be pumped at temperatures of up to 105°C.
• D-Model Series Construction Characteristics:
  • Crankcase of aluminium-cast or solid spheroidal-cast iron (P41, P50, P71) for high stability and vibration damping.
  • Crankshaft with grooved ball bearings or coned roller bearings (P41, P50, P71) together with plain bearing con rod running in oil-bath.
  • Solid ceramic plunger.
  • Double plunger sealing of high-temperature resistant fibre.
  • Coolant on P41DK, P50DK and P71DK to keep seals cool, increasing seal life.
  • Identical suction and discharge valves, easily accessible.
• Materials Used:
  • Valve Casing: Special Brass; P50DK and P71DK Cast Bronze; P71GDK – nickel-plated sphero-cast-iron.
  • Plunger: Solid ceramic.
  • Valves: High Grade Stainless Steel.
  • Sleeves: Nitrile / Hot Water Nitrile with fabric reinforcing.
  • Crankshaft: Drop-forged and case-hardened.

Operating limits

• Data provided is for intermittent operation. Data for continuous operation is available on request.
• A safety valve must be installed in accordance with guidelines for liquid spraying units, set so that the admissible operating pressure cannot be exceeded by more than 10%. Pump operation without a safety valve, or any excess in temperature or speed limits, automatically voids the warranty.

Note: Some models (P21/23-130D, P50/94-110DK, P71/145-180GDK, P71/250-100GDK) are listed with Code No. but do not have specific performance data provided in this table fragment.

Feed water

• NPSHR: NPSHR-values must be kept under control.
• Intake Pressure: Intake pressure must be determined depending on the medium temperature, potentially requiring a centrifugal pump as a booster pump.
• Pulsation Damping:
  • Water column pulsation on the suction side of the high-pressure pump must be damped by means of an air chamber or a diaphragm accumulator.
  • For pump models up to P30/43D, a suction line one size larger than the pump connection usually suffices. In this case, a flexible hose must be installed from a distance of at least 2m in front of the pump to damp pulsation.
  • For P41, P50, and P71 pumps, it is advisable to provide means for a pulsation damper which can be fitted in the inlet line so that all the water flows through the damper. The necessity depends largely on the conception of the whole system.
  • If several pumps are to be applied to one system, every individual high-pressure pump must be provided with a separate suction line leading out of either a ventilated or damped head tank. Depending on static suction height and temperature, every suction line must be fitted with its own booster pump to ensure NPSHR values are maintained.
  • Should several high-pressure pumps be connected to one common suction line, a suction stream stabiliser is to be installed in front of every pump which controls pulsation damping. Overlaying suction pulsations from individual high-pressure pumps can lead to cavitation.
• Seal Cooling (DK models): Pump models P41DK, P50/94DK, and P71DK are supplied equipped with fittings for a coolant for the high-pressure seals. The plunger seal cases are connected to one another by pipe fittings behind the high-pressure seals, through which cool water flows. This keeps the seals cool and extends their life considerably.

Electrical

• Power Calculation Formula: Intermediate values for power (kW) can be established by linear extrapolation. A general formula for calculating power is: P (bar) x Q (l/min) = kW / 475.

Mechanical / hydraulic

• Intermediate values for output / speed and pressure / output / kW can be established by linear extrapolation.
• Dimension sheets are available for various models (P11/10-100D, P11/13-100D, P11/15-100D, P21/18-130D, P21/23-130D, P30/36-150D, P30/43-130D, P41/58-110DK, P50/94-110DK, P71/145-180(G)DK, P71/250-100(G)DK). Dimensions are in mm.

Disclaimer

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

Official datasheet (PDF)

Lenntech datasheet mirror