Product Overview

The TD Series In-Line Circulation Pump (also known as Inline Circulator Pump, Pipeline Circulation Pump, or Vertical Inline Pump) is a high-efficiency centrifugal pump designed specifically for fluid circulation in HVAC systems, industrial cooling applications, and heating networks. Manufactured by Shanghai Chaodun Machinery Manufacturing Group Co., Ltd., this pump combines advanced hydraulic design with compact construction to deliver reliable performance across diverse circulation applications.

Featuring a vertical in-line configuration, the TD Series pump integrates directly into pipeline systems without requiring additional foundation or space. The motor and pump are mounted on a common shaft, creating a compact electromechanical unit that minimizes footprint while maximizing efficiency. This design makes it ideal for installations where space is limited, such as mechanical rooms, equipment skids, and retrofit projects.

The pump’s precision-engineered impeller and volute casing ensure smooth fluid flow with minimal turbulence, resulting in low noise operation and reduced energy consumption. The mechanical seal design allows for easy maintenance without removing the pump from the pipeline, significantly reducing downtime and service costs.

Whether you need a circulation pump for chilled water systems, hot water heating loops, industrial process cooling, or boiler feed applications, the TD Series delivers consistent, reliable performance with minimal maintenance requirements.

Key Features

1. High-Efficiency Hydraulic Design – Optimized impeller and volute geometry maximize flow efficiency while minimizing energy consumption, reducing operating costs by up to 30% compared to conventional circulation pumps.
2. Ultra-Low Noise Operation – Precision-balanced rotating assembly and advanced bearing design ensure noise levels below 55 dB(A), making it suitable for noise-sensitive environments such as hospitals, hotels, and office buildings.
3. Compact In-Line Configuration – Vertical design with motor and pump on common shaft eliminates need for separate foundation, reducing installation space by up to 50% compared to horizontal pump arrangements.
4. Cartridge Mechanical Seal – Pre-assembled seal cartridge allows for quick replacement without removing pump from pipeline, reducing maintenance time from hours to minutes.
5. Integrated Motor Protection – Built-in thermal overload protection and IP55-rated motor enclosure ensure reliable operation in demanding environments while extending motor service life.
6. Corrosion-Resistant Construction – Cast iron pump body with epoxy coating and stainless steel shaft provide excellent corrosion resistance for long-term reliability in various water quality conditions.

Applications

1. HVAC Chilled Water Circulation – Primary and secondary circulation pumps for commercial building air conditioning systems, providing reliable chilled water flow to air handling units, fan coil units, and cooling coils.
2. Hot Water Heating Systems – Circulation pumps for residential and commercial heating loops, including radiator systems, underfloor heating, and domestic hot water recirculation applications.
3. Industrial Process Cooling – Cooling water circulation for manufacturing equipment, injection molding machines, laser cutting systems, and other industrial processes requiring precise temperature control.
4. Boiler Feed and Condensate Return – Low-pressure boiler feed applications and condensate return systems in steam heating plants, power generation facilities, and industrial steam systems.
5. Solar Thermal Systems – Heat transfer fluid circulation in solar water heating systems, solar space heating installations, and solar-assisted industrial process heating applications.
6. Geothermal Heat Pump Systems – Ground loop circulation pumps for closed-loop geothermal heat pump systems, providing reliable fluid circulation for residential and commercial geothermal installations.

Customer Benefits

1. Reduced Energy Costs – High-efficiency hydraulic design and premium efficiency motors lower electricity consumption, delivering payback in as little as 12-18 months through energy savings alone.
2. Minimal Maintenance Requirements – Cartridge mechanical seal and precision-balanced rotating assembly extend service intervals to 3-5 years, reducing maintenance costs and unplanned downtime.
3. Space-Saving Installation – Compact in-line design eliminates need for separate foundation and reduces piping complexity, lowering installation costs and freeing up valuable mechanical room space.
4. Quiet Operation – Ultra-low noise levels below 55 dB(A) ensure comfortable working environments and eliminate noise complaints in occupied spaces such as offices, hospitals, and residential buildings.
5. Long Service Life – Corrosion-resistant materials and precision manufacturing ensure 15-20 year service life with proper maintenance, providing excellent return on investment and reducing lifecycle costs.
6. Flexible Installation Options – Vertical or horizontal mounting, flanged or threaded connections, and multiple voltage options allow installation in virtually any piping configuration without system modifications.

Technical Specifications

Parameter	Specification
Flow Rate Range	2-1200 m³/h
Head Range	10-80 m
Motor Power Range	1.1-160 kW
Speed Options	1450 / 2900 RPM
Inlet/Outlet Size	DN32-DN300
Maximum Operating Pressure	1.6 MPa
Maximum Operating Temperature	120°C (standard), 180°C (high-temp option)
Pump Material	Cast iron (standard), Stainless steel (optional)
Shaft Material	Stainless steel 304/316
Seal Type	Cartridge mechanical seal
Motor Protection	IP55, Class F insulation
Voltage Options	380V/50Hz, 440V/60Hz, 220V/60Hz
Connection Type	Flanged (PN16), Threaded (optional)
Noise Level	<55 dB(A) at rated speed

Selection Guidance

Selecting the right TD Series circulation pump requires careful consideration of your system requirements:

1. Determine System Flow Rate – Calculate total system flow based on heat load and temperature differential. For HVAC applications, typical ΔT is 5-10°C for chilled water and 10-20°C for hot water systems.
2. Calculate Required Head – System head includes static head (elevation difference), friction losses (pipe, fittings, valves), and equipment pressure drops. Use pump curve to select model that operates near best efficiency point.
3. Consider Operating Temperature – Standard pumps handle up to 120°C. For high-temperature applications above 120°C, specify high-temperature option with special seal and bearing arrangements rated to 180°C.
4. Select Appropriate Material – Cast iron construction is suitable for most water applications. For corrosive fluids, seawater, or high-purity water systems, specify stainless steel wetted parts.
5. Choose Connection Type – Flanged connections (PN16) are standard for DN50 and above. Threaded connections are available for DN32-DN40 sizes. Consider system pressure rating and installation requirements.
6. Evaluate Control Options – Single-speed pumps are suitable for constant flow applications. For variable flow requirements, consider pairing with VFD (Variable Frequency Drive) for energy savings and precise flow control.

Installation and Maintenance

Installation Requirements:

• Mount pump in horizontal or vertical position with motor above pump head
• Ensure adequate clearance for maintenance access (minimum 600mm around pump)
• Install isolation valves and strainer on suction side
• Provide proper pipe support to prevent stress on pump flanges
• Align piping to prevent excessive force on pump connections
• Install pressure gauges on suction and discharge for performance monitoring

Maintenance Schedule:

• Monthly: Visual inspection for leaks, unusual noise, or vibration
• Quarterly: Check motor current, bearing temperature, and seal condition
• Annually: Inspect mechanical seal, check alignment, clean strainer
• Every 3 Years: Replace mechanical seal cartridge, inspect bearings
• Every 5 Years: Complete pump overhaul, replace bearings if necessary

Maintenance Tips:

• Always shut off power and close isolation valves before maintenance
• Use manufacturer-recommended spare parts to maintain warranty
• Keep maintenance log to track service intervals and component replacement
• Monitor pump performance (flow, head, power) to detect efficiency degradation

Available Configurations

The TD Series is available in multiple configurations to match your specific application requirements:

Configuration Option	Available Choices
Flow Range	2-1200 m³/h (multiple models)
Motor Power	1.1-160 kW
Speed	1450 RPM (low speed), 2900 RPM (high speed)
Pump Material	Cast iron (standard), Stainless steel 304, Stainless steel 316
Seal Type	Standard mechanical seal, High-temp seal, Double mechanical seal
Connection Type	Flanged PN16, Threaded BSP/NPT
Voltage	380V/50Hz, 440V/60Hz, 220V/60Hz, Custom voltage
Temperature Rating	Standard (≤120°C), High-temp (≤180°C)
Motor Type	Standard efficiency, IE2 high efficiency, IE3 premium efficiency
Control Option	Direct-on-line, Star-delta, VFD compatible
Mounting	Vertical (standard), Horizontal (optional)

Custom Configurations:

• Explosion-proof motors for hazardous area installations
• ATEX-certified pumps for explosive atmospheres
• Special materials for corrosive or abrasive fluids
• Duplex mechanical seals for critical applications
• Integrated VFD for variable flow applications

FAQs

Q1: What is the difference between an in-line pump and a standard centrifugal pump?

An in-line pump (also called inline circulator pump or pipeline circulation pump) has suction and discharge ports on the same centerline, allowing it to be installed directly in the pipeline like a valve. Standard centrifugal pumps have perpendicular suction and discharge, requiring more complex piping arrangements. In-line pumps are more compact and easier to install in space-constrained applications.

Q2: Can TD Series pumps handle hot water above 100°C?

Yes, standard TD Series pumps handle water temperatures up to 120°C. For applications requiring temperatures up to 180°C (such as high-temperature heating systems or industrial process applications), specify the high-temperature option with special mechanical seal and bearing arrangements designed for elevated temperatures.

Q3: How do I select between 1450 RPM and 2900 RPM models?

Lower speed (1450 RPM) models offer quieter operation, longer bearing life, and better efficiency at higher flow rates. Higher speed (2900 RPM) models are more compact and cost-effective for lower flow, higher head applications. For noise-sensitive environments like hospitals or hotels, 1450 RPM is recommended. For industrial applications where noise is less critical, 2900 RPM provides better value.

Q4: What is the expected service life of a TD Series pump?

With proper installation and regular maintenance, TD Series pumps typically provide 15-20 years of reliable service. Key factors affecting service life include water quality, operating conditions, maintenance frequency, and proper pump selection. Regular mechanical seal replacement (every 3-5 years) and bearing inspection (every 5 years) significantly extend pump life.

Q5: Can these pumps be used with variable frequency drives (VFD)?

Yes, all TD Series pumps are VFD-compatible when paired with inverter-duty motors (IE3 premium efficiency recommended). VFD operation provides significant energy savings in variable flow applications, typically 20-50% energy reduction compared to constant speed operation. Ensure minimum motor speed is above 25% of rated speed to maintain proper motor cooling.

Q6: What maintenance is required for the mechanical seal?

The cartridge mechanical seal is designed for 3-5 years of service under normal operating conditions. Signs of seal wear include visible leakage at the seal location or increased power consumption. Seal replacement is straightforward: isolate the pump, remove the old cartridge, install new cartridge, and reconnect. No special tools or pump disassembly required. Typical seal replacement takes 30-60 minutes.

Contact Chaodun

For technical consultation, quotation requests, or project support regarding TD Series In-Line Circulation Pumps, please contact our engineering team:

Website: https://chaodunpump.com
Email: Suzion@chaodunpump.com
WhatsApp: +44 751 8050 473
Phone: +86 21 5744 5678

Our pump application engineers are available to assist with pump selection, system design, hydraulic calculations, and technical support for your circulation pump project. We provide comprehensive documentation including pump curves, dimensional drawings, and installation manuals for all TD Series models.

Shanghai Chaodun Machinery Manufacturing Group Co., Ltd.
Professional manufacturer of industrial pumps, circulation pumps, and fluid handling systems for HVAC, industrial, and commercial applications.