Key Features & Advantages
- Stainless Steel Shaft & Construction: Utilizes corrosion-resistant stainless steel for all wetted parts, providing fundamental defense against saltwater corrosion and ensuring long-term structural integrity in marine environments.
- National Standard Motor: Powered by reliable, high-efficiency motors manufactured to national standards, ensuring consistent performance in challenging conditions.
- Premium Brand Bearings: Equipped with high-quality bearings designed for smooth operation and extended service life, even under continuous load in saline applications.
- Silicon Carbide (SiC) Mechanical Seals: Employs ultra-hard and corrosion-resistant silicon carbide as the sealing face material. This is critical for seawater applications, as SiC provides exceptional resistance to abrasion from sand or silt and corrosion from salt, dramatically improving seal longevity and preventing leakage.
- Fluor Rubber (FKM/Viton) O-Rings: Instead of standard rubber, this series uses Fluorocarbon Elastomer (FKM, commonly known as Viton) O-rings. FKM offers superior resistance to seawater, ozone, and a wide range of chemicals, ensuring the static seals remain effective and do not degrade quickly in harsh fluids.
- Full Head, Wide Voltage Design: Incorporates DONGTAO’s signature performance technology. The pump delivers stable operation across its entire performance curve, from zero to maximum head. It is also built to tolerate voltage fluctuations common in remote or marine power supplies:
- Single-Phase (QDX S) Models: Operate normally from 160V to 230V.
- Three-Phase (QX S) Models: Operate normally from 330V to 380V.
Model Number Instruction
The model code specifies the pump’s type and key parameters:
- Q: Submersible Pump (Three-phase)
- QD: Submersible Pump (Single-phase)
- X: Small / Clean Water Type
- S: Denotes “Seawater” version (appears in model suffix, e.g., QDX3-16-0.37S)
- First Number: Rated Flow (m³/h)
- Second Number: Rated Head (m)
- Third Number: Motor Power (kW)
Example: QDX3-16-0.37 S= Single-phase stainless steel seawater pump with 3 m³/h flow, 16m head, and 0.37kW power.
Technical Specifications (Partial List)
Single-Phase Seawater (QDX S) Models
| No. | Model | Voltage (V) | Rated Flow (m³/h) | Rated Head (m) | Power (kW) | Pipe Dia. (mm) |
|---|---|---|---|---|---|---|
| 1 | QDX3-16-0.37 S | 220 | 3 | 16 | 0.37 | 25 |
| 2 | QDX3-20-0.55 S | 220 | 3 | 20 | 0.55 | 25 |
| 3 | QDX15-7-0.55 S | 220 | 15 | 7 | 0.55 | 50 |
| 4 | QDX3-27-0.65 S | 220 | 3 | 27 | 0.65 | 25 |
| 5 | QDX10-12-0.65 S | 220 | 10 | 12 | 0.65 | 50 |
| 6 | QDX3-30-0.75 S | 220 | 3 | 30 | 0.75 | 25 |
| 7 | QDX7-18-0.75 S | 220 | 7 | 18 | 0.75 | 40 |
| 8 | QDX10-16-0.75 S | 220 | 10 | 16 | 0.75 | 50 |
| 9 | QDX15-10-0.75 S | 220 | 15 | 10 | 0.75 | 65 |
| … | … | … | … | … | … | … |
| 23 | QDX100-6-3 S | 220 | 100 | 6 | 3 | 150 |
Three-Phase Seawater (QX S) Models
| No. | Model | Voltage (V) | Rated Flow (m³/h) | Rated Head (m) | Power (kW) | Pipe Dia. (mm) |
|---|---|---|---|---|---|---|
| 1 | QX40-9-1.5 S1 | 380 | 40 | 9 | 1.5 | 80 |
| 2 | QX50-7-1.5 S / QX60-7-2.2 S1* | 380 | 50 / 60 | 7 | 1.5 / 2.2 | 100 |
| 3 | QX40-13-2.2 S | 380 | 40 | 13 | 2.2 | 80 |
| 4 | QX65-8-2.2 S | 380 | 65 | 8 | 2.2 | 100 |
| 5 | QX100-6-3 S | 380 | 100 | 6 | 3 | 150 |
Note: Model listed combines two flow/power variants for the same nominal head and outlet size.
Applications
- Seawater intake and circulation for aquaculture (fish farms, shrimp ponds).
- Saltwater transfer and boosting on boats, offshore platforms, and marinas.
- Desalination plant pre-treatment and process water handling.
- Cooling water systems using seawater or brackish water.
- Drainage and dewatering in coastal construction or mining sites.
- Processing and handling of brines or other highly corrosive industrial fluids.
Why Choose DONGTAO Q(D)X Stainless Steel Seawater Series?
- Marine-Grade Corrosion Resistance: Specifically configured with materials (Stainless Steel, SiC, FKM) chosen for maximum resistance to saltwater corrosion and degradation.
- Critical Seal Protection: The combination of Silicon Carbide mechanical seals and Fluoroelastomer O-rings forms a sealing system specifically engineered to survive in abrasive and corrosive seawater.
- Built for Harsh Conditions: From the motor to the seals, every component is selected or treated to enhance durability in marine environments.
- Operational Flexibility: The full-head and wide-voltage design ensures reliable performance despite varying system pressures and unstable power sources often found in remote coastal or offshore locations.
- Proven Reliability in Saline Environments: Offers a specialized solution where standard stainless steel or cast iron pumps would rapidly fail.
Contact Us for Marine & Corrosive Application Support
Selecting the right pump for seawater duty is critical. Contact our technical sales team for the complete seawater series catalog, detailed material specifications, and expert assistance in choosing the model that matches your specific salinity, flow, head, and duty cycle requirements.
