The TD Series In-Line Circulation Pump from Chaodun Pump is a single-stage pipeline circulation pump designed for reliable fluid transfer, pressurization, and circulation across HVAC, heating, cooling, and industrial applications. Engineered with a top pull-out maintenance design and robust mechanical sealing, the TD series minimizes downtime while maintaining consistent performance in continuous-duty environments.
Unlike conventional circulation pumps, the TD series features enhanced resistance to impurities in the pumped liquid, extended motor protection ratings, and flexible installation configurations that accommodate both small-bore and large-bore pipeline systems.
Key Design Features
Top Pull-Out Maintenance Design
The TD pump is engineered with a top pull-out configuration, allowing complete maintenance access without disconnecting the piping system. This design significantly reduces maintenance time and eliminates the need to drain the entire pipeline when servicing the pump internals.
Enhanced Impurity Resistance
Compared to similar products in its class, the TD series demonstrates improved tolerance to particulates and trace impurities in the pumped liquid, making it suitable for systems where water quality may not meet the most stringent purity standards.
Two Structural Configurations by Bore Size
- TD 32 – TD 150 (bore sizes): Extended shaft design for direct coupling to the motor
- TD 200 – TD 300 (bore sizes): Quick-detach structure with cartridge-type mechanical seal — seal replacement does not require motor disassembly
Reliable Motor System
- Fully enclosed, fan-cooled standard 2-pole or 4-pole motor
- Protection class: IP55
- Insulation class: F
- Standard voltage options (50 Hz): 1×220-230/240V or 3×200-220/346-380V
Rotation Direction
Clockwise rotation when viewed from the motor fan end.
Technical Specifications
| Parameter | Specification |
|---|---|
| Maximum Working Pressure | 12 bar (standard) / 16 bar (special type) |
| Liquid Temperature Range | -15°C to +110°C |
| Ambient Temperature | Up to +40°C |
| Maximum Altitude | 1,000 meters |
| Motor Protection Class | IP55 |
| Motor Insulation Class | Class F |
| Motor Poles | 2-pole or 4-pole |
| Rotation | Clockwise (viewed from motor fan end) |
Model Designation Guide
| Code Element | Meaning |
|---|---|
| TD | Pipeline Circulation Pump |
| 50 | Nominal Suction and Discharge Diameter (DN 50) |
| 24 | Rated Head (24 meters) |
| 2 | Number of Motor Poles (2-pole) |
| B | Explosion-Proof Motor |
Example: TD 50-24/2 B denotes a DN50 pipeline circulation pump with 24m rated head, 2-pole motor, and explosion-proof configuration.
Application Scenarios
The TD Series is a versatile circulation pump capable of handling a wide range of media — from clean tap water to industrial process liquids. Typical applications include:
1. District Heating Systems
Primary circulation in district heating networks, where water quality meets the recognized standards for heating system media. The pump’s -15°C to 110°C operating range covers the full spectrum of hot water heating requirements.
2. HVAC and Air Conditioning Systems
Secondary circulation loops in commercial and industrial HVAC installations. The TD pump’s compact in-line form factor integrates directly into existing pipe runs without requiring additional foundation work for motor sizes ≤2.2 kW.
3. Cooling Systems
Chilled water circulation, cooling tower supply, and process cooling loops. The pump’s robust mechanical seal design ensures reliable operation under continuous thermal cycling conditions.
4. Domestic Hot Water Systems
Hot water recirculation in residential and commercial buildings, maintaining consistent supply temperatures throughout the distribution network.
5. Industrial Liquid Transfer
Transfer and circulation of clean, non-aggressive, non-flammable liquids that are free from solid particles and fibrous materials — including process water, treated fluids, and similar low-viscosity media.
6. Water Supply Systems
Booster circulation in pressurized water supply networks, where the pump maintains adequate flow and pressure across the distribution system.
Installation Guidelines
Mounting Requirements
- Piping Support: The pipeline system must have adequate structural support for the pump. Pumps equipped with motors ≤2.2 kW can be suspended directly in the pipeline.
- Orientation: For motors ≤2.2 kW, installation may be horizontal or vertical within the working pipe. For motors >2.2 kW, the pump must be installed vertically (perpendicular to the horizontal plane).
- Pipeline Stress: Installation must ensure that pipeline tension is not transmitted to the pump body during operation.
- Motor Cooling: Adequate cooling airflow must be available around the motor, with cooling air temperature not exceeding 40°C.
- Outdoor Installation: When installed outdoors, an appropriate protective cover must be fitted to prevent water ingress or condensation on electrical components.
- Maintenance Clearance: Sufficient space must bereserved above and below the pump for inspection and servicing: minimum 300 mm for motors <5.5 kW; minimum 1,000 mm for motors ≥5.5 kW.
- Vibration Isolation: A vibration-damping base should be used — typically a concrete base weighing ≥1.5× the pump’s weight — to minimize noise and vibration for optimal operation.
- Baseplate Options: ENL32–ENL150 products are available with or without a baseplate to meet different installation requirements.
Standards Compliance
The TD Series In-Line Circulation Pump is designed and tested in accordance with relevant domestic pump design and testing standards, ensuring consistent quality and performance across all operating conditions.
Frequently Asked Questions
Q1: What types of liquids can the TD pump handle?
The TD pump is designed for thin, clean, non-aggressive, non-flammable liquids that do not contain solid particles or fibers. Typical media include tap water, treated water, and industrial liquids with physical-chemical properties similar to water. Viscous or high-density liquids will cause performance curve degradation and increased energy consumption.
Q2: Can the TD pump be installed horizontally?
Yes, for models with motors ≤2.2 kW, both horizontal and vertical installations are supported. For motors >2.2 kW, vertical installation is required.
Q3: How does the top pull-out design work?
The top pull-out configuration allows the pump’s core assembly to be removed from above without disconnecting the inlet and outlet piping. This means maintenance can be performed while the pipeline system remains intact and pressurized (after isolating the pump section).
Q4: What is the difference between the extended shaft and quick-detach structures?
TD 32–TD 150 bore sizes use an extended shaft design where the pump shaft extends directly from the motor. TD 200–TD 300 bore sizes use a quick-detach structure with a cartridge mechanical seal — this allows seal replacement without removing the motor, simplifying maintenance on larger units.
Q5: What is the maximum working pressure?
The standard type supports up to 12 bar maximum working pressure. A special type rated for 16 bar is also available for higher-pressure system requirements.
Q6: Can the TD pump be used outdoors?
Yes, provided an appropriate protective enclosure is installed to prevent water ingress and condensation on electrical components. The ambient temperature must not exceed 40°C.
Why Choose Chaodun Pump
Chaodun Pump manufactures the TD Series with attention to maintainability, operational reliability, and integration flexibility. The combination of top pull-out servicing, cartridge seal options for larger models, and dual mounting configurations makes the TD Series a practical choice for engineers designing circulation systems across HVAC, industrial, and water supply applications.
For technical consultation or product specifications, contact Chaodun Pump’s engineering team at chaodunpump.com.