ISG Series Vertical Inline Pipeline Pump
A vertical inline pipeline pump whose suction and discharge flanges sit on the same centreline, so it installs straight into the pipe run — 1.5–1600 m³/h, 2–125 m, to 250 kW.
The ISG series is a vertical inline pipeline pump: the suction and discharge flanges sit on the same centreline, so the pump drops straight into the pipe run like a valve, with no base plate and no elbow offsets.
Flow covers 1.5–1600 m³/h with heads of 2–125 m and motor power from 0.18 to 250 kW, and it handles liquids from -20°C to 120°C.
Because the impeller is mounted directly on the extended motor shaft and the rotor can be lifted out by unbolting the casing, installation and maintenance are simple and the piping does not have to be dismantled.
It is the usual choice for HVAC and refrigeration circulation, hot-water and district-heating loops, high-rise water supply, fire-water pressure maintenance and industrial process lines.
| Parameter | Specification |
| Type | Vertical inline centrifugal pipeline pump |
| Flow | 1.5–1600 m³/h |
| Head | 2–125 m |
| Power | 0.18–250 kW |
| Temperature | -20°C to 120°C |
| Installation | Vertical inline — in-line suction and discharge flanges, no base plate |
| Seal | Hard alloy wear-resistant mechanical seal |
| Impeller | Mounted directly on the extended motor shaft, statically and dynamically balanced |
| Bearings | Low-noise motor bearings; pump and motor bearing arrangement optimised for radial and axial loads |
| Maintenance | Rotor assembly removable by unbolting the casing, without dismantling the pipework |
| Arrangement | Units can be run in series or parallel for higher flow or head |
| Medium | Clear water and liquids with similar physical and chemical properties |
| Model | Flow (m³/h) | Head (m) | Efficiency (%) | Rev (r/min) | Motor (kW) |
| 15-80 | 1.5 | 8 | 34 | 2800 | 0.18 |
| 20-110 | 2.5 | 15 | 34 | 2800 | 0.37 |
| 20-160 | 2.5 | 32 | 25 | 2900 | 0.75 |
| 25-110 | 4 | 15 | 42 | 2900 | 0.55 |
| 25-125 | 4 | 20 | 36 | 2900 | 0.75 |
| 25-125A | 3.6 | 16 | 35 | 2900 | 0.55 |
| 25-160 | 4 | 32 | 32 | 2900 | 1.5 |
| 25-160A | 3.7 | 28 | 31 | 2900 | 1.1 |
| 32-100 | 4.5 | 12.5 | 44 | 2900 | 0.55 |
| 32-100(I) | 6.3 | 12.5 | 54 | 2900 | 0.75 |
| 32-125 | 5 | 20 | 44 | 2900 | 0.75 |
| 32-125A | 4.5 | 16 | 43 | 2900 | 0.55 |
| 32-160 | 6.5 | 32 | 44 | 2900 | 1.5 |
| 32-160A | 4 | 25 | 34 | 2900 | 1.1 |
| 32-160(I) | 6.3 | 32 | 40 | 2900 | 2.2 |
| 32-200 | 4.5 | 50 | 32 | 2900 | 3 |
The table lists representative sizes; the full ISG range extends to 1600 m³/h and 125 m head — confirm the exact model and impeller trim for your duty point.
Sixteen published ISG sizes from 15-80 (1.5 m³/h at 8 m, 0.18 kW) to 32-200 (4.5 m³/h at 50 m, 3 kW); larger sizes extend the range to 1200 m³/h at heads up to 125 m. Duty points are nominal and motor selection may vary with the duty.
- Seal: a hard alloy wear-resistant mechanical seal replaces the packing of older centrifugal pumps, which cuts leakage, extends service life and keeps the pump area clean.
- Impeller & shaft: the impeller is mounted directly on the extended motor shaft and balanced statically and dynamically for low noise and vibration; the pump and motor bearing arrangement is optimised to balance radial and axial loads.
- Bearings & motor: low-noise motor bearings, with the motor mounted on top of the inline casing.
- Casing & ports: inlet and outlet are aligned on the same centreline so the pump installs at any position in the line, like a valve; a rain cover is available for outdoor installation.
- Body material: selected for clear water and liquids with similar physical and chemical properties — confirm suitability for other media.
- Maintenance & arrangement: the rotor assembly lifts out by unbolting the pump casing without disturbing the piping, and units can be run in series or parallel for specific flow and head requirements.
- Pipeline boosting: raises pressure in long pipeline runs and keeps flow steady along the line.
- HVAC and refrigeration circulation: circulates chilled and heating water in building services and refrigeration cycles.
- District heating and hot water: serves hot-water circulation and district-heating loops within the -20°C to 120°C range.
- High-rise water supply: boosts water supply for upper floors and pressurised building services.
- Fire water: supports fire-fighting pressure and fire-water pressure maintenance.
- Industrial and municipal water: water supply and drainage, garden irrigation and long-distance transmission.
- Process lines: maintains flow and pressure in industrial process lines handling water-like liquids.
- Confirm the pipe diameter, flange standard and layout, because the inline body fits directly into the run and replaces a section of pipe.
- Select motor power within the 0.18 to 250 kW range from the required flow and head, and check the duty point against the published curve.
- Check that the liquid temperature stays within -20°C to 120°C for the standard construction.
- Verify NPSH available at the inlet to avoid cavitation, particularly on suction-lifted or high-temperature duties.
- Allow headroom above the pump for lifting the motor and rotor assembly during maintenance.
- Confirm whether the installation is indoors or outdoors, and add the rain cover if it is exposed.
Where is the ISG pipeline pump used?
For pipeline boosting, HVAC and refrigeration circulation, district heating and hot water, high-rise water supply, fire-water pressure maintenance and industrial process lines.
What range does the ISG series cover?
Flow 1.5 to 1600 m³/h, head 2 to 125 m, motor power 0.18 to 250 kW, and liquid temperatures from -20°C to 120°C.
Why choose a vertical inline pump?
The inline body installs directly in the pipe run — suction and discharge on the same centreline — which saves floor space, removes the base plate and reduces the piping needed.
How is the ISG pump sealed?
It uses a hard alloy wear-resistant mechanical seal, which solves the packing-leakage problems of older centrifugal pumps and extends service life.
Can ISG pumps be combined for more flow or head?
Yes. Units can be operated in series or parallel to meet specific flow rate and head requirements.
Related Products
- GDL Series Vertical Multistage Pipeline Pump
- Pipeline Circulation Pump
How to Choose an ISG Inline Pipeline Pump
Quick answer: A pipeline circulation pump is selected for the flow and pressure drop of the system, plus fluid temperature, pipe size and installation arrangement. The ISG covers 1.5–1600 m³/h at 2–125 m and -20°C to 120°C, fitted directly into the line.
What is the difference between ISG and IS centrifugal pumps?
ISG is a vertical inline pump: both suction and discharge flanges are in line, so it installs directly in the pipeline with no base plate or elbow fittings. IS is a horizontal end-suction pump needing a base plate and separate inlet piping. ISG saves floor space and suits HVAC and building services; IS is preferred where low NPSHa requires a pump with lower NPSHr.
Which model covers my duty point?
Read the duty flow across to the model whose published head is above the calculated system head — for example 32-200 gives 4.5 m³/h at 50 m and 3 kW, while larger sizes extend the range to 1200 m³/h. The centrifugal pump selection guide covers the calculation method.
What data is needed to select a pipeline pump?
Required flow, head or pressure drop, liquid temperature, pipe size and length, fluid properties, NPSH available and the duty cycle, plus the motor supply.
Selection Data to Send Our Engineers
- Pipeline flow rate (m³/h)
- System head / pressure drop (m)
- Pipe size and length
- Liquid name and temperature
- NPSH available
- Duty cycle and motor supply
Industry Applications
Explore how this equipment can be applied in related industrial sectors and review application-specific selection guidance.
Technical selection & RFQ
Request a Quote for ISG Series Vertical Inline Pipeline Pump
Looking for a ISG Series Vertical Inline Pipeline Pump supplier for an industrial project? Share the operating conditions below so our team can review the duty, recommend a suitable configuration and prepare a quotation. Final model selection and performance should be confirmed against your actual process conditions and the applicable product data.
Information to include in your inquiry
- Duty point: Required flow rate and total head / discharge pressure; include the operating point if known
- Pumped medium: Fluid name, concentration, viscosity, density, solids content and corrosiveness
- Operating conditions: Normal and maximum temperature, inlet pressure, suction lift and duty cycle
- Materials & sealing: Preferred wetted materials, seal type and any leakage or hygiene requirements
- Motor & installation: Voltage, frequency, phase, hazardous-area requirements if applicable, and mounting / connection details
Not all details are available yet? Send the information you have, your datasheet or a process description. We can identify the missing selection data before confirming a model.