The ISG series vertical single-stage centrifugal pump platform extends far beyond standard clean water duty. Based on the IS-type centrifugal pump performance parameters and designed per ISO 2858, the series includes six distinct configurations — each engineered for a specific medium and operating environment. From 80°C clean water to 120°C hot water, corrosive chemicals, petroleum products, and explosive liquids, the ISG platform provides a vertical inline solution for nearly every industrial fluid transfer requirement.
The Six ISG Series Configurations
| Model | Full Name | Medium | Temperature |
| ISG | Vertical In-Line Centrifugal Pump | Clean water, similar liquids | < 80°C |
| IRG | Vertical In-Line Hot Water Pump | Hot water for boilers, heating | < 120°C |
| IHG | Vertical Chemical Centrifugal Pump | Corrosive liquids, no solids | -20°C to 120°C |
| YG | Vertical In-Line Oil Pump | Gasoline, kerosene, diesel | -20°C to 120°C |
| IHGB | Vertical Stainless Explosion-Proof Chemical Pump | Flammable chemical liquids | -20°C to 120°C |
| ISGD/IRGD/IHGD/YGD | Low-Speed Vertical Centrifugal Pump | Noise-sensitive environments | Varies by type |
Hot Water Circulation: IRG Configuration
The IRG hot water variant serves boiler feed, building heating systems, and industrial hot water circulation in textiles, wood processing, paper manufacturing, and hospitality. Key considerations for hot water operation:
- Pre-heating required before startup: temperature rise rate of 50°C/hour to ensure even thermal distribution
- During shutdown, cool gradually at less than 10°C/minute until temperature drops below 80°C
- Mechanical seal uses high-temperature resistant materials rated for continuous 120°C service
- Drain pump completely if ambient temperature may drop below freezing during extended shutdown
Chemical Transfer: IHG Configuration
The IHG chemical pump handles corrosive liquids without solid particles, with viscosity similar to water. Typical applications include petroleum refining, chemical processing, metallurgy, power generation, paper manufacturing, food processing, pharmaceutical production, and synthetic fiber operations. The pump’s wet-end materials resist chemical attack across the -20°C to 120°C temperature range.
Petroleum Transfer: YG Configuration
The YG oil pump is designed specifically for gasoline, kerosene, diesel, and similar petroleum products. Sealing materials and motor specifications meet the requirements for flammable liquid handling. The vertical inline design eliminates the need for specialized oil pump pits, reducing installation footprint.
Explosion-Proof Chemical: IHGB Configuration
For flammable chemical liquids, the IHGB stainless steel explosion-proof variant combines chemical corrosion resistance with explosion-proof motor certification. This configuration serves chemical plants, solvent handling, and any application where both corrosive media and ignition risk are present.
Low-Noise Operation: Suffix D Models
The low-speed variants (ISGD, IRGD, IHGD, YGD, IHGBD) are designed for environments where noise is a critical concern — hospitals, hotels, office buildings, and residential areas. Reduced rotational speed lowers both acoustic noise and vibration while maintaining adequate flow and head for HVAC circulation and building water supply.
Maintenance-Friendly Design
All ISG series pumps share a maintenance advantage that reduces downtime significantly:
- No piping disassembly required: Remove the pump coupling seat nuts and extract the entire rotor assembly — impeller, shaft, mechanical seal, and motor — as a single unit
- Inline installation: Inlet and outlet at the same diameter on the same centerline, installable directly in the pipeline like a valve
- Compact vertical footprint: Small floor space requirement, can be installed outdoors with a protective cover
- Direct-coupled impeller: Impeller mounts directly on the motor’s extended shaft — short axial dimension, compact structure
Operating Parameters
| Max Suction Pressure | ≤ 1.0 MPa |
| Max System Working Pressure | ≤ 1.6 MPa |
| Static Test Pressure | 2.5 MPa |
| Ambient Temperature | < 40°C |
| Relative Humidity | < 95% |
| Solid Particle Content | ≤ 0.1% by volume, particle size < 0.2mm |
| Mechanical Seal Leakage | ≤ 3 drops/minute (normal) |
| Motor Bearing Temperature | ≤ 70°C during operation |
Installation Guidelines
- Check all fasteners for tightness and clear flow channels of debris before installation
- Piping weight must not rest on the pump body — use independent pipe supports
- Tighten anchor bolts firmly to prevent vibration during startup
- Install regulating valves on both inlet and outlet, plus a pressure gauge near the outlet
- After installation, rotate the pump shaft by hand — no friction or binding should be present
- Two installation modes available: rigid coupling and flexible coupling
Series and Parallel Operation
The ISG series supports flexible system configuration:
- Parallel operation: Multiple pumps in parallel increase total flow while maintaining the same head — ideal for variable-demand building water supply systems
- Series operation: Pumps in series increase total head while maintaining the same flow — suitable for high-rise building zoned pressure systems
FAQ
Q: Can the standard ISG model handle hot water above 80°C?
A: No. For temperatures above 80°C up to 120°C, use the IRG hot water variant with high-temperature mechanical seal materials.
Q: What if my chemical has small solid particles?
A: Standard IHG requires liquids without solid particles. For liquids with fine particles (≤ 0.2mm, ≤ 0.1% by volume), specify wear-resistant mechanical seal at order time.
Q: How do I choose between rigid and flexible coupling installation?
A: Rigid coupling provides more stable alignment for continuous duty. Flexible coupling tolerates minor pipe misalignment and reduces vibration transmission. Choose based on your piping precision and noise requirements.
Q: What is the major overhaul interval?
A: Approximately one year of continuous operation. Replace bearings and wear parts as needed during overhaul.
Why Choose Chaodun Pump
Chaodun Pump manufactures the complete ISG series — all six configurations from a single production platform. This means consistent quality, interchangeable spare parts across models, and expert application support for selecting the right variant for your specific medium and operating conditions. Contact our engineering team with your flow, head, medium, and temperature requirements.