Overview of TD Series In-Line Circulation Pump
The TD Series In-Line Circulation Pump is a single-stage pipeline pump engineered for continuous fluid transfer and circulation duty in commercial and industrial systems. Designed with a top-pullout maintenance configuration, it allows full pump servicing without disturbing connected piping — a feature that significantly reduces downtime in facilities where uninterrupted operation matters. Compared to similar pump types, the TD Series is notably more resistant to impurities commonly found in circulated liquids.
This pump handles clean, non-aggressive, non-flammable liquids free of solid particles or fibers — essentially water or fluids with comparable physical and chemical properties. It is widely deployed in district heating networks, HVAC systems, cooling circuits, domestic hot water loops, and general industrial fluid transfer applications.
Key Design Features
- Top-Pullout Service Design: The pump can be disassembled from the top without breaking into the pipeline system, enabling quick inspection and repair of the impeller, mechanical seal, and bearing assembly.
- Extended Shaft Construction (DN32–DN150): Models in the TD 32 to TD 150 size range use an extended shaft design, directly coupling the pump impeller to the motor shaft for improved alignment and reduced vibration.
- Cartridge Mechanical Seal (DN200–DN300): Larger-diameter models adopt a quick-removal structure with a cartridge-type mechanical seal that can be replaced without removing the motor.
- Standard Enclosed Motor: Fully enclosed, fan-cooled 2-pole or 4-pole motor with IP55 protection and Class F insulation, compatible with both single-phase and three-phase 50 Hz power supplies.
- Inline Installation Flexibility: Pumps paired with motors ≤ 2.2 kW can be suspended directly in the pipeline, installed horizontally or vertically. Units with motors > 2.2 kW must be installed vertically.
Technical Specifications
| Max Working Pressure | 12 bar (standard) / 16 bar (special) |
| Liquid Temperature Range | -15°C to +110°C |
| Ambient Temperature | Up to +40°C |
| Max Altitude | 1,000 m |
| Rotation Direction | Clockwise (viewed from motor fan end) |
| Motor Protection | IP55 |
| Insulation Class | F |
| Power Supply (50 Hz) | 1×220-230/240V or 3×200-220/346-380V |
| Nominal Diameter Range | DN20 to DN300 |
Model Naming Convention
Example: TD 50-24/2 B
- TD — Pipeline Circulation Pump series designation
- 50 — Nominal suction and discharge diameter (DN 50)
- 24 — Rated head in meters (24 m)
- 2 — Number of motor poles (2-pole)
- B — Explosion-proof motor option
Installation Guidelines
- Piping Support: The system piping must be capable of supporting the pump. Units with motors ≤ 2.2 kW can be suspended directly in the pipeline.
- Orientation: Pumps with motors ≤ 2.2 kW may be installed horizontally or vertically in the working pipeline. Units with motors > 2.2 kW must be installed vertically relative to the horizontal plane.
- Pipeline Stress: Installation must ensure that system pipeline tension is not transferred to the pump body during operation.
- Motor Cooling: The pump must be installed in an environment with adequate cooling airflow, and the cooling air temperature must not exceed 40°C.
- Outdoor Protection: If installed outdoors, a suitable enclosure must be provided to prevent water ingress or condensation on electrical components.
- Service Clearance: Sufficient space must be reserved above and below the pump for inspection and maintenance. Minimum clearance: 300 mm for motors < 5.5 kW; 1,000 mm for motors ≥ 5.5 kW.
- Vibration Isolation: To minimize noise and vibration, the pump should be mounted on a vibration-dampening base — typically a concrete pad weighing at least 1.5 times the pump weight.
- Baseplate Options: DN32–DN150 models are available with or without a baseplate to suit different installation requirements.
Typical Applications
- District Heating Systems: Circulating heated water through network distribution loops, provided water quality meets recognized system standards.
- HVAC & Air Conditioning: Chilled water and hot water circulation in commercial building climate control systems.
- Cooling Systems: Industrial cooling water recirculation for process equipment and heat exchangers.
- Domestic Hot Water: Hot water circulation in residential and commercial plumbing systems.
- Industrial Fluid Transfer: General-purpose transfer of clean, non-aggressive liquids in manufacturing and processing plants.
- Water Supply Systems: Pressure boosting and circulation in municipal and building water supply networks.
Why Choose Chaodun TD Series?
Chaodun’s TD Series In-Line Circulation Pump combines a straightforward, service-friendly design with robust construction suited to continuous-duty applications. The top-pullout configuration means maintenance teams can service the pump without draining or disconnecting the piping system — a practical advantage in occupied buildings and critical infrastructure. With models spanning DN20 to DN300, the TD Series covers a wide range of flow and head requirements across heating, cooling, and industrial circulation applications.