What Pump Should You Use for Industrial Water Supply, HVAC Circulation and High-Rise Building Boosting? A Complete Guide to ISW Horizontal Inline Centrifugal Pumps
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The ISW horizontal pipeline centrifugal pump is designed based on a combination of the IS type centrifugal pump and the vertical pump structure. It is an efficient and energy-saving product designed and manufactured according to the international standard ISO2858 and the national pipeline centrifugal pump standard JB/T53058-93. The flow range is 1.1–1450 m³/h, the head range is 5–150 m, the power range is 0.18–160 kW, speed is 2900/1450 r/min, and the inlet and outlet diameters are DN25–DN500. The ISW pump adopts a horizontal single-stage single-suction centrifugal structure, with horizontal symmetry between the inlet and outlet, both located on the same centerline. It can be installed in pipelines like a valve, with a compact and attractive appearance, small footprint, and low construction investment. The main structural features are as follows: The impeller is mounted directly on the extended motor shaft, which shortens the axial dimension and makes the structure compact; the pump and motor bearing arrangement is reasonable, effectively balancing the radial and axial loads generated during pump operation, ensuring smooth operation and low vibration and noise. The shaft seal uses a mechanical seal or a combination of mechanical seals, employing imported titanium alloy seal rings, medium-size high-temperature resistant mechanical seals, and hard alloy material, which are wear-resistant and effectively extend the service life of the mechanical seals. Installation and maintenance are convenient, requiring no disassembly of the pipeline system; all rotor components can be removed by simply loosening the pump coupling seat nut. The outlet can be arranged in three directions—left, right, or upward—facilitating pipeline layout and saving space. Pump series can be operated in series or parallel according to usage requirements, and vertical or horizontal installation can be chosen according to pipeline layout. Depending on the temperature and medium, the ISW series has derivatives suitable for hot water, corrosive media, and oils, including the ISWR, ISWH, ISWY, and ISWB series. The ISW horizontal clean water pump operates at temperatures t ≤ 80℃; ISWR hot water pump operates at t ≤ 120℃; ISWH chemical pump operates at -20℃ to +120℃; ISWY oil pump operates at -20℃ to 120℃. Motor power can be optionally equipped with a standard three-phase asynchronous motor or an explosion-proof motor as required. ISW series is generally used in non-explosive environments. For coal mine underground or chemical explosive gas environments, an explosion-proof motor or ISWB explosion-proof type should be selected. Why choose the ISW horizontal pipeline centrifugal pump? First, the pipeline installation saves space. The coaxial design of the inlet and outlet allows it to be directly connected in the pipeline without requiring an additional foundation, occupying a small area, and incurring low construction costs. Second, it is highly efficient and energy-saving, using advanced hydraulic models and IS-type centrifugal pump performance parameters, operating smoothly with relatively low noise. Third, it has a compact structure, with the impeller directly mounted on the motor's extended shaft, resulting in a short axial dimension, smooth operation, and low vibration and noise. Fourth, maintenance is convenient, as the rotor components can be extracted without dismantling the pipeline. Fifth, it has a wide range of applications, covering industrial water supply and drainage, high-rise building pressurization, HVAC circulation, fire-fighting pressurization, and mine drainage, among other industries. The ISW series is mainly used for: industrial and urban water supply and drainage, pressurized water supply for high-rise buildings, garden irrigation, fire-fighting pressurization, long-distance transportation, HVAC circulation, and hot and cold water circulation and pressurization for bathrooms and equipment, with a use temperature of T≤80℃. The ISWR horizontal hot water pump is widely used in metallurgy, chemical industry, textile, paper-making, hotels, and other boiler hot water pressurization and circulation systems, as well as urban heating systems, with a use temperature of T≤120℃. The ISWH horizontal chemical pump is used to transport liquids without solid particles, corrosive, and with water-like viscosity. It is suitable for petroleum, chemical, metallurgy, power, paper-making, food and pharmaceutical, and synthetic fiber industries, with a use temperature of -20℃ to +120℃. The ISWY horizontal pipeline oil pump is for transporting gasoline, kerosene, diesel, and other oil products, with a conveyed medium temperature of -20℃ to +120℃. It is also used for mine water drainage and ore beneficiation processes. The people who need the ISW series include: industrial and urban water supply and drainage system integrators, high-rise building and fire-fighting project contractors, HVAC system integrators, chemical, petroleum, and pharmaceutical plant equipment procurement and engineering technicians, mining enterprise equipment procurement teams, OEM equipment manufacturers (for pump sets), industrial pump distributors and stockists, and overseas EPC project contractors. Under which circumstances should the ISW pump be chosen or replaced? When industrial water supply and drainage systems require pressurization pumps and space is limited, necessitating pipeline installation; when high-rise buildings require pressurized water supply and a small footprint is required; when HVAC systems need circulation pressurization pumps; when fire-fighting systems need pressurization pumps that operate reliably; and when mines require mine water drainage pumps with matching flow and head. The old pump has low efficiency and high energy consumption, requiring an energy-saving upgrade; pipeline modification is needed, which requires installing the pump directly in the existing pipeline; the project at the outlet requires pumps that meet ISO2858 standards. How to choose an ISW horizontal pipeline centrifugal pump? Step 1: Determine the flow rate and head by calculating the required flow rate and total head (static head + pipeline loss + outlet pressure) based on the pipeline system. The system design recommends reserving 5%–10% of the head as margin; Step 2: Select the pump model by matching the flow rate and head in the performance curve or model table. For example, in the model ISW100-160(I)AB, 100 is the inlet/outlet diameter in mm, 160 is the nominal impeller diameter in mm, I is the flow rate classification, and AB indicates the impeller has been trimmed; Step 3: Confirm medium characteristics. For corrosive media, choose stainless steel fluid-facing parts (304/316/316L), for clean water, cast iron is sufficient; Step 4: Confirm medium temperature. For temperatures below 80°C, select ISW clean water type; below 120°C, select ISWR hot water type; for -20°C to +120°C, select ISWH chemical type or ISWY oil pump type; Step 5: Confirm working pressure. Suction pressure ≤1.0MPa or the maximum pump system working pressure ≤1.6MPa; the pump static pressure test pressure is 2.5MPa. For pressures exceeding this, special orders are needed; Step 6: Select installation method. The outlet can be arranged to the left, right, or upward, supporting vertical and horizontal installation; Step 7: Confirm motor configuration. Power ranges from 0.18–160kW, standard voltage is 380V/50Hz, and custom options include 220V/380V/410V/460V/50Hz/60Hz; Step 8: If using a frequency converter, confirm frequency compatibility.
Model example: `ISW100-160(I)AB`, which means ISW horizontal single-stage single-suction direct-coupled centrifugal pump, 100 is the nominal diameter of the pump inlet and outlet in mm, 160 is the nominal impeller diameter in mm, I is the flow category, AB indicates the impeller has been trimmed.
Main models and parameter table of the ISW series (2-pole motor, 50Hz, example)
| Model | Flow m³/h | Head m | Motor power kW | Speed r/min | Efficiency % | NPSH m | Inlet/outlet diameter mm |
|---|---|---|---|---|---|---|---|
| ISW20-110 | 2.5 | 15 | 0.37 | 2900 | 36 | 2.0 | DN20 |
| ISW25-125 | 4.0 | 20 | 0.75 | 2900 | 36 | 2.3 | DN25 |
| ISW32-125 | 5.0 | 20 | 0.75 | 2900 | 44 | 2.3 | DN32 |
| ISW40-125 | 6.3 | 20 | 1.1 | 2900 | 54 | 2.3 | DN40 |
| ISW50-160 | 25 | 32 | 5.5 | 2900 | 65 | 2.5 | DN50 |
| ISW65-160 | 50 | 32 | 7.5 | 2900 | 70 | 3.0 | DN65 |
| ISW80-160 | 100 | 32 | 15 | 2900 | 76 | 3.5 | DN80 |
| ISW100-250 | 100 | 80 | 37 | 2950 | 71 | 4.0 | DN100 |
| ISW125-400 | 100 | 50 | 30 | 1450 | 76 | 4.5 | DN125 |
| ISW150-315 | 200 | 32 | 30 | 1450 | 77 | 5.0 | DN150 |
| ISW200-315 | 200 | 32 | 30 | 1480 | 77 | 3.5 | DN200 |
| ISW250-250 | 550 | 20 | 45 | 1450 | 80 | 4.0 | DN250 |
General technical parameter table
| Parameter | Specification |
|---|---|
| Series | ISW |
| Type | Horizontal single-stage single-suction centrifugal pump |
| Design standard | ISO2858，JB/T53058-93 |
| Flow range | 1.1–1450m³/h |
| Head range | 5–150m |
| Power range | 0.18–160kW |
| Speed | 2900/1450 r/min |
| Efficiency range | 36%–85% |
| Inlet and outlet diameter | DN25–DN500 |
| Medium temperature | ISW clear water type ≤ 80℃; ISWR hot water type ≤ 120℃; ISWH chemical type -20℃～+120℃; ISWY oil pump type -20℃～+120℃ |
| Working pressure | Suction pressure ≤ 1.0MPa or system maximum working pressure ≤ 1.6MPa, static pressure test ≤ 2.5MPa |
| Ambient temperature | <40℃ |
| Relative humidity | <95% |
| Solid particles | Volume content ≤ 0.1%, particle size < 0.2mm |
| Installation method | Horizontal/vertical, outlet can face left/right/up |
Dimension drawing placeholder: `[Image: /images/isw-pump-dimension-drawing.webp]`
Material table
| Component | Standard material | Optional material | Description |
|---|---|---|---|
| Pump body, impeller | Cast iron | 304/316/316L stainless steel | Choose stainless steel for corrosive media |
| Pump shaft | 45# carbon steel | 2Cr13, stainless steel | Quenched and tempered |
| Mechanical seal | Hard alloy | Silicon carbide, titanium alloy sealing rings, fluororubber | Wear-resistant seal to extend service life |
| Bearing | Sealed bearing | NSK/SKF | Maintenance-free |
| Motor | Standard three-phase asynchronous motor | Explosion-proof motor (ISWB) | Suitable for horizontal installation |
| Flange | National standard flange | American/Japanese standard flange | Convenient connection |
| Coating | Industrial paint | Epoxy paint, anti-corrosion paint | Optional for corrosive environments |
Installation method
| Installation method | Description | Typical applications |
|---|---|---|
| Horizontal installation | Horizontal pipeline installation, inlet and outlet coaxial | Industrial water supply and drainage, HVAC systems |
| Vertical installation | Vertical pipeline installation, inlet and outlet coaxial vertical | Space-restricted scenarios |
| Outlet direction | Outlet can face left, right, or upward | Convenient for pipeline layout and installation |
| Rigid connection | Rigid installation, inlet ball valve + straight pipe + outlet gate valve + base + concrete foundation | Fixed pipeline system |
| Flexible connection | Flexible joint + base + concrete foundation | Pipeline system requiring vibration reduction |
Key points for installation inspection: The pump should be installed on a smooth and level foundation, and the inlet and outlet pipelines should be stress-free; the weight of the pipeline should not be applied on the pump during installation, and the foundation bolts must be tightened; install one regulating valve on both the pump inlet and outlet pipelines, and install one pressure gauge on the pump outlet accessory; before startup, check that the pump shaft can rotate freely, rotating the pump shaft several turns by hand; confirm the motor rotation direction is consistent with the arrow direction on the pump; before startup, the pump must be filled with medium, and long-term operation in cavitation state is prohibited; periodically check motor current, which must not exceed the rated current.
Application scenario table
| Industry | Application | Recommended Configuration | Key Requirements |
|---|---|---|---|
| Industrial Water Supply and Drainage | Urban Water Supply and Drainage, Long-distance Transport | ISW Standard Type, 2-pole/4-pole | Large Flow, High Head |
| High-rise Buildings | Boost Water Supply, Firefighting Boost | ISW Standard Type, 2-pole | High Head, Small Footprint |
| HVAC | Hot and Cold Water Circulation Boost, Boiler Hot Water Circulation | ISWR Hot Water Type, 4-pole | High Temperature Resistance, Low Noise |
| Chemical and Petroleum | Corrosive Liquid Transport, Process Pump | ISWH Chemical Type, 4-pole/2-pole | Corrosion Resistance, Mechanical Seal |
| Mining | Mine Water Drainage, Mineral Processing | ISW Standard Type + Wear-resistant Seal | Wear-resistant, Large Flow |
| Power and Metallurgy | Boiler Feed Water, Cooling Water Circulation | ISWR Hot Water Type / ISW Standard Type | High Temperature Resistance, Continuous Operation |
| Food and Pharmaceutical | Liquid Transport, CIP Cleaning | ISWH Stainless Steel Type | Hygienic, Easy to Clean |
| Oil Transport | Gasoline, Kerosene, Diesel Transport | ISWY Oil Pump Type, 4-pole | Explosion-proof, Oil-resistant |
Note: For explosive environments, please choose the ISWB explosion-proof type or equip with an explosion-proof motor.
## Technical FAQ
1. What is an ISW horizontal pipeline centrifugal pump?
ISW is a horizontal single-stage single-suction pipeline centrifugal pump, designed according to the structural combination of IS type centrifugal pump and vertical pump, manufactured according to ISO2858 and JB/T53058-93 standards, with symmetrical horizontal inlet and outlet, and can be installed in pipelines like a valve.
2. What are the flow and head ranges of the ISW pump?
Flow: 1.1–1450 m³/h, Head: 5–150 m, Power: 0.18–160 kW.
3. What is the efficiency of the ISW pump?
Efficiency range: 36%–85%, varies with pump type and operating point.
4. What media is the ISW pump suitable for?
ISW clear water type can convey clean water and liquids with similar physicochemical properties, Temperature ≤ 80℃; ISWR hot water type ≤ 120℃; ISWH chemical type can convey corrosive liquids, -20℃ to +120℃; ISWY oil pump type can convey gasoline, kerosene, diesel, etc., -20℃ to +120℃.
5. What is the material of the ISW pump?
Standard flow-through parts are made of cast iron, optional 304/316/316L stainless steel, mechanical seal uses carbide/silicon carbide/titanium alloy sealing ring/fluororubber.
6. What installation methods does the ISW pump support?
Horizontal and vertical installation, outlet can be arranged to the left, right, or upward, facilitating pipeline layout and installation.
7. What is the working pressure of the ISW pump?
Suction pressure ≤ 1.0 MPa, maximum system working pressure ≤ 1.6 MPa, static pressure test ≤ 2.5 MPa, higher requires special order.
8. Can the ISW pump use a frequency converter?
Yes, it is recommended to confirm frequency compatibility; using a frequency converter can achieve energy-saving speed regulation.
9. What is the difference between ISW and ISG?
ISG is a vertical clear water pump, ISW is a horizontal clear water pump, both have the same performance parameters, only installation methods differ. ISG is suitable for vertical pipeline installation in limited spaces, while ISW is suitable for horizontal pipeline installation.
10. What is the difference between ISW and IHG?
ISW is a horizontal clean water pump, mainly used for conveying clean water with a temperature ≤80°C; IHG is a vertical chemical pump, with optional stainless steel flow components for stronger corrosion resistance, temperature ≤120°C.
11. Can ISW pumps be used in mines?
Yes, they are suitable for mine water drainage and mineral processing flows. It is recommended to equip them with wear-resistant mechanical seals.
12. What should be noted before starting an ISW pump?
Before starting, the pump must be filled with medium, check that the pump shaft can rotate freely, confirm the motor rotation direction is correct, and open the inlet and outlet valves.
13. What are the common faults of ISW pumps?
Pump not delivering water (valve not open, pipeline blocked, incorrect rotation), insufficient flow (impeller blocked, pipeline leakage), excessive power (bearing wear, medium density too high), noise and vibration (cavitation, misalignment).
14. What is the maintenance cycle for ISW pumps?
The main overhaul period for the unit is generally one year; after long-term operation, worn mechanical parts need to be replaced.
15. Can ISW pumps be customized?
Material (304/316/316L), voltage and frequency (220V/380V/410V/460V/50Hz/60Hz), installation method, explosion-proof configuration (ISWB), hot water type (ISWR), chemical type (ISWH), oil pump type (ISWY), frequency control, etc., can be customized.
16. Can ISW pumps be used in explosive environments?
Standard ISW is not suitable; ISWB explosion-proof type or explosion-proof motor must be selected.
17. What is the cavitation allowance of ISW pumps?
The cavitation allowance range is 2.0–6.0m, varying with specific models. When selecting, ensure that NPSHa (available net positive suction head) is greater than NPSHr (required net positive suction head).
18. Can the ISW pump outlet direction be adjusted?
Yes, the outlet can be arranged in three directions: left, right, and upwards, which is convenient for pipe layout and installation, saving space.
Keywords: Pump, Industrial, Water, Supply, HVAC, Circulation, High, Rise, Building, Boosting, ISW, Horizontal