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Pump type
SE 1250-45-11

Model: SE 1250-45-11
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Pump type
SE 1250-45-11

The SE 1250-45-11 pump and the unit based on it are designed for pumping water in district heating networks. The water must not contain solid particles larger than 0.2 mm and with a concentration exceeding 5 mg/L.

The pumps are manufactured in the UHL climate version — intended for macroclimatic regions with moderate and cold climates, placement category 4 — operation in rooms (volumes) with artificially controlled climatic conditions according to GOST 15150-69.

Pump designation FLOW RATE, m3/h Pressure, m ROTATION SPEED, rpm ALLOWABLE NET POSITIVE SUCTION HEAD, m Pump efficiency, % Motor power, kW Pump weight, kg Unit weight, kg
SE 1250-45-11 1250 45 1500 7,5 82 200 2300 3810

APPLICATION OF THE SE 1250-45-11 DISTRICT PUMP

The SE 1250-45-11 district pump belongs to a special group of power pumps, characterized by temperature fluctuations of the supplied water over a wide range of flows, and is designed to pump water with a temperature of up to 180 °C in district heating networks.

TECHNICAL CHARACTERISTICS

Nominal Pump Parameters

Parameter Value
Flow, m³/h 1250
Head, m 45
Allowable Cavitation Margin, m* 7.5
Efficiency, % 82
Temperature, °C 10–180
Rotation Speed, rpm 1500

*This parameter is important to consider when designing the external network (pipeline system and fittings) and selecting pump equipment.

Dimensions and Weight

Parameter Pump Unit
Weight, kg 2300 3810
Dimensions (W×L×H), mm 1800×1796×1235 1800×3160×1340

The SE 1250-45-11 district pump is driven by a squirrel-cage asynchronous electric motor with a power of 200 kW. The overall efficiency of this system is 78 %.

MAIN REQUIREMENTS FOR SE 1250-45-11 PUMP DESIGN

  • High reliability and cost-effectiveness
  • External tightness and absence of internal leaks at rotor and stator joints
  • Long service life – mean time to overhaul not less than 31,500 hours (when all maintenance requirements are met)
  • Dynamic stability across the entire operating range
  • Stable, continuously decreasing head curve for reliable operation when pumps are connected in parallel
  • Ease of assembly, disassembly, maintenance, and high serviceability under operating conditions

CONSTRUCTION FEATURES OF THE SE 1250-45-11 PUMP

  • Horizontal design providing high vibration resistance, reduced shaft misalignment, and extended service life of components
  • Spiral type with horizontal split along the pump axis, allowing easy maintenance, assembly, and operation. Inlet and discharge nozzles are located at the bottom for pump assembly/disassembly without disconnecting pipelines
  • Single-stage with a double-suction impeller made of two halves
  • Pump casing is a complex cast iron structure in two parts (pump cover and pump body), with semi-spiral inlet channels and double-spiral discharge, including chambers (thermal barriers) for cooling fluid supply and discharge to mechanical seals. Bottom section includes inlet/discharge nozzles, support feet, trough-like brackets for leakage collection, and bearing mounts. Support feet are close to the pump axis to minimize misalignment during heating. A longitudinal keyway fixes the casing to the foundation frame for directed thermal expansion
  • Rotor is a separate assembly consisting of shaft, double-suction impeller in two halves, bushings, protective bushings, bearings, and half-coupling. Axial movement of the impeller is fixed with bushings and protective bushings with round nuts. Thermal gaps compensate for thermal expansion of rotor components
  • Rotor is axially unloaded using the double-suction impeller
  • Rotor bearings are sliding bearings. Drive-side bearing handles radial loads; the other bearing is a combination of sliding and double-row angular contact ball bearing for radial and residual axial loads. Lubrication is liquid, ring-type (sump) with oil rings. Cooling jackets are provided in the bearing housings
  • Mechanical seals are of gland type with a seal ring. Cooling and prevention of air suction are provided by circulation chambers and supply holes for pressurized cooling fluid
  • Torque is transmitted from motor to pump via flexible sleeve-finger coupling

MATERIAL EXECUTION OF THE SE 1250-45-11 PUMP BY CHT SLOVAKIA S.R.O.

High reliability, durability, and efficiency are ensured by high-quality materials. Pump casing and bearing housings are made of cast iron СЧ200 for strength and corrosion resistance. Shaft is made of heat-treated steel 40Х for high strength and wear resistance. Impeller and protective bushings are made of stainless steel 20Х13; sealing rings – stainless steel 30Х13, ensuring efficiency and long service life.

ADDITIONAL SUPPLY OPTIONS FOR SE 1250-45-11 PUMP

  • Mechanical seal to reduce leakage and improve energy efficiency, easy to maintain
  • Higher-grade materials and coatings for pump flow parts to increase erosion resistance
  • Flexible plate coupling between motor and pump to improve vibration characteristics and reliability
  • VDS monitoring system with vibration, speed, and temperature sensors for condition monitoring, early problem detection, and maintenance planning

PURCHASE OF SE 1250-45-11 PUMP FROM CHT SLOVAKIA S.R.O.

To order a specific unit or get consultation for selection, contact our sales department by phone on the website or submit a request via the feedback form. Products are delivered to all CIS countries (except RF and BY) and European countries.