IS Single-Stage End-Suction Centrifugal Pump: A Comprehensive High-Efficiency & Energy-Saving Industrial Pump Solution

The IS series single-stage end-suction centrifugal pump stands as one of the most reliable, efficient, and widely adopted industrial pump solutions across global markets. Designed in accordance with ISO2858 standards, the IS pump delivers excellent hydraulic performance, superior structural stability, and high cost-effectiveness—making it a preferred choice in municipal water supply, industrial circulation, building HVAC systems, and agricultural irrigation.

Its hallmark advantages—high efficiency, low energy consumption, easy maintenance, and long service life—position the IS pump as an essential piece of fluid-handling equipment for manufacturing facilities, infrastructure projects, and commercial applications. This comprehensive article explores its technical features, working principles, performance specifications, application scenarios, selection guidelines, and competitive advantages in the market.

1. Product Overview

1.1 What is an IS Single-Stage End-Suction Centrifugal Pump?

The IS pump is a horizontal, single-suction, single-stage centrifugal pump designed for clean water or liquids with similar properties. This structure offers low noise, smooth operation, and minimal maintenance requirements.

1.2 Key Performance Features

• High pumping efficiency

• Energy-saving hydraulic structure

• Robust and durable design

• Low noise & stable operation

• Easy maintenance (back-pull-out design)

• Long operating lifespan

• Wide flow/head range

• ISO standardization ensures compatibility

2. Structural Design & Mechanical Advantages

The IS pump integrates multiple engineering optimizations to ensure performance stability and strong mechanical reliability.

2.1 Back-Pull-Out Structural Design

This feature allows:

• Maintenance of impeller, shaft, bearings without removing inlet/outlet pipelines

• Reduced service downtime

• Lower maintenance cost

The design is especially useful in industrial installations where pipelines are complex.

2.2 High-Efficiency Closed Impeller

The impeller is precision-cast and dynamically balanced to meet ISO standards. Benefits include:

• Higher hydraulic efficiency

• Reduced energy loss due to turbulence

• Extended wear resistance

• Stable flow delivery

2.3 High-Strength Pump Shaft

Made from high-grade carbon steel or stainless steel:

• High rigidity

• Minimal deflection

• Stable rotation at high speeds

This ensures smooth coupling with the motor and reduces bearing wear.

2.4 Bearing System

The pump adopts:

• Imported heavy-duty bearings

• Noise-reducing design

• Anti-vibration construction

Ensuring long service intervals.

2.5 Mechanical Seal or Packing Seal Options

Mechanical seal advantages：

• Excellent sealing performance

• Suitable for continuous operation

• Zero leakage design

Packing seal advantages：

• Easy to replace

• Cost-effective

Both sealing types are designed for long-term industrial operation.

2.6 High-Quality Pump Body Materials

Common options include:

Material	Application
Cast Iron	General water supply & HVAC
SS304/SS316	Food, chemical, seawater
Bronze	Shipbuilding, seawater circulation
Duplex Steel	Corrosive & high-pressure media

3. Working Principle

The IS pump operates based on the centrifugal force created by the rotating impeller:

1. Liquid enters the impeller eye through the suction port.

2. The rotating impeller increases the liquid’s velocity.

3. Kinetic energy is converted into pressure head in the volute casing.

4. The pressurized liquid flows out through the discharge port.

This simple yet efficient mechanism enables continuous and stable water delivery across industrial environments.

4. Performance Range

• Flow rate: 6.3–400 m³/h

• Head: 5–125 m

• Speed: 1450 / 2900 rpm

• Medium temperature: 0–80°C (higher temperature optional)

• Pressure rating: PN16

• Efficiency: up to 88%

The broad performance range gives the IS pump strong adaptability for both low-pressure and medium-pressure water systems.

5. Technical Parameter Table (HTML Format)

IS 50 series (small flow type)

Model	Flow m³/h	Head m	Speed r/min	Efficiency %	NPSHr m	Power kW	Inlet mm	Outlet mm
IS50-32-125	6.3	20	2900	63	2.0	2.2	50	32
IS50-32-160	6.3	32	2900	58	2.0	3	50	32
IS50-32-200	6.3	50	2900	54	2.0	5.5	50	32
IS50-32-250	6.3	80	2900	48	2.5	7.5	50	32
IS50-32-315	6.3	125	2900	45	3.0	11	50	32

IS 65 series (small and medium traffic type)

Model	Flow	Head	Speed	Efficiency	NPSHr	Power	Inlet	Outlet
IS65-50-125	12.5	20	2900	68	2.5	3	65	50
IS65-50-160	12.5	32	2900	65	2.5	5.5	65	50
IS65-50-200	12.5	50	2900	60	2.8	7.5	65	50
IS65-40-250	12.5	80	2900	55	3.0	11	65	40
IS65-40-315	12.5	125	2900	50	3.0	18.5	65	40

IS 80 series (conventional industrial flow type)

Model	Flow	Head	Speed	Efficiency	NPSHr	Power	Inlet	Outlet
IS80-65-125	25	20	2900	72	3.0	4	80	65
IS80-65-160	25	32	2900	72	3.0	7.5	80	65
IS80-65-200	25	50	2900	70	3.0	11	80	65
IS80-50-250	25	80	2900	68	3.2	18.5	80	50
IS80-50-315	25	125	2900	65	3.5	30	80	50

IS 100 Series (High Efficiency, Wide Application Type)

Model	Flow	Head	Speed	Efficiency	NPSHr	Power	Inlet	Outlet
IS100-80-125	50	20	2900	80	3.5	7.5	100	80
IS100-80-160	50	32	2900	78	3.5	11	100	80
IS100-80-200	50	50	2900	75	3.8	15	100	80
IS100-65-250	50	80	2900	72	4.0	22	100	65
IS100-65-315	50	125	2900	70	4.2	37	100	65

IS 125 series (medium to high flow type)

Model	Flow	Head	Speed	Efficiency	NPSHr	Power	Inlet	Outlet
IS125-100-125	100	20	2900	82	4.0	15	125	100
IS125-100-160	100	32	2900	80	4.2	18.5	125	100
IS125-100-200	100	50	2900	80	4.5	22	125	100
IS125-100-250	100	80	2900	78	4.8	37	125	100
IS125-80-315	100	125	2900	75	5.0	55	125	80

IS 150 series (high flow, high lift type)

Model	Flow	Head	Speed	Efficiency	NPSHr	Power	Inlet	Outlet
IS150-125-125	200	20	2900	85	4.5	22	150	125
IS150-125-160	200	32	2900	84	4.5	30	150	125
IS150-125-200	200	50	2900	83	4.8	45	150	125
IS150-125-250	200	80	2900	82	5.0	55	150	125
IS150-100-315	200	125	2900	80	5.5	75	150	100

IS 200 series (large industrial pump)

Model	Flow	Head	Speed	Efficiency	NPSHr	Power	Inlet	Outlet
IS200-150-125	400	20	1450	88	5.0	22	200	150
IS200-150-160	400	32	1450	88	5.0	30	200	150
IS200-150-200	400	50	1450	87	5.2	45	200	150
IS200-150-250	400	80	1450	85	5.2	75	200	150
IS200-125-315	400	125	1450	84	5.5	110	200	125

6. Application Scenarios

6.1 Industrial Production

Used for circulating water in machinery, cooling systems, industrial washing, heat exchange, and process pipelines.

6.2 HVAC Systems

Ideal for:

• Chilled water circulation

• Cooling tower water supply

• Boiler feed water (if temperature is low)

6.3 Municipal Engineering

• Urban water supply

• Pressure boosting stations

• Wastewater treatment (for clean water stages)

6.4 Agriculture & Irrigation

• Farmland irrigation

• Sprinkler systems

• River water transfer

6.5 Firefighting Systems

The IS pump is frequently used in:

• Fire hydrant booster pumps

• Fire water circulation systems

6. Competitive Comparison

Feature	IS Pump	Multistage Pump	Self-Priming Pump
Efficiency	★★★★★	★★★★	★★★
Maintenance	Easy	Medium	Easy
Cost	Low	High	Medium
Operating Pressure	Medium	Very High	Low
Installation	Simple	Medium	Simple
Ideal Use	General water transfer	High-pressure needs	Suction lift

7. Selection Guidelines

To choose the correct IS pump, consider:

• Required flow rate

• Required head

• Liquid type and temperature

• Installation environment

• Pipe diameter

• Motor efficiency range (standard / high-efficiency motor)

I can also help generate professional pump selection sheets if needed.

8. Frequently Asked Questions (FAQ)

Q1: What liquids can the IS pump handle?

Clean water or liquids with similar physical/chemical properties, up to 80°C (higher temperature optional).

Q2: Can it be used for seawater?

Yes—if stainless steel or bronze materials are selected.

Q3: How long is the lifespan?

5–10 years depending on working conditions and maintenance.

Q4: Is it easy to install?

Yes. The pump is horizontally mounted and fully compliant with ISO flange standards.

Q5: Can I use a VFD (frequency inverter)?

Absolutely. The IS pump works perfectly with variable-frequency control for energy savings.