Stainless Steel Impeller Of Submersible Pump

The stainless steel impeller of the submersible pump is the core rotating component of the submersible pump. The submersible pump itself is a vertical, single suction, multi-stage centrifugal pump that works underwater. It achieves high head by connecting multiple impellers in series. Different from the logic of the slurry pump impeller and the dredging pump impeller, which mainly focus on "anti-corrosion", the core mission of the stainless steel impeller of the submersible pump is anti-corrosion + anti-slight wear + hygiene and safety - the medium is clean water, groundwater, well water, seawater, and slightly corrosive chemical liquids. Therefore, the material of the impeller has been switched from cast iron/high chromium to 304/316/316L/904L/dual phase steel/titanium.

This product is divided into two types based on manufacturing process:
Precision cast impeller: It is made using lost wax casting or resin sand casting techniques. The material can be 304/316/316L/904L/CD4MCu/dual-phase steel/titanium, with single-piece weights ranging from a few grams to 10 tons. It is suitable for large and medium-sized submersible electric pumps such as SP series, WQS series, and SFQ series.
Pressing and welding impeller: It is formed by pressing with AISI 304 stainless steel plates through advanced molds and laser welding. It is suitable for radial/mixed-flow impellers of 4SP/6SP/8SP/10SP series deep well pumps. It has low cost, good consistency, and is hygienic.

Series-connected structure - Submersible pumps use multiple-stage impellers connected in series (deep well pumps can have up to 20-60 stages), with each stage impeller achieving precise dynamic balance to ensure that the overall pump vibration value is below the ISO 10816 standard.
Dynamic balance G6.3 level - Each impeller is balanced before leaving the factory to ensure that it does not cause rapid bearing damage due to imbalance during long-term operation in deep well and narrow spaces.
Closed/semi-open options available - The impellers of clear water deep well pumps are mostly closed radial/mixed-flow structures (high efficiency); the impellers of submersible sewage pumps are semi-open (resistant to blockage)
Full coverage of corrosion resistance series - 304 (clear water/well water), 316/316L (seawater/containing chloride ions water), 904L (strongly corrosive chemical liquids), duplex steel 2205/329 (pump shaft, high strength + resistance to chloride stress corrosion), titanium (seawater/strong corrosion)

The stainless steel impeller of the submersible pump follows the submersible pump, and the core scenario is "multi-stage high-head transportation in corrosive/clear water media":
Municipal water supply and groundwater extraction (maximum single unit):
Urban water supply network pressurization, high-rise building water supply: 4SP/6SP deep well submersible pumps, 304 stainless steel multi-stage impeller, with a head of up to 620m
Rural drinking water projects, township water supply stations: V4/V6 series deep well pumps, SS304 impeller
Groundwater recharge and ground source heat pump: Corrosion-resistant 316 impeller
Agricultural irrigation
Large-scale farm sprinkler/drip irrigation systems: 6SP/8SP deep well pumps, flow rate 60-680 GPM
Orchards, vineyards, golf course irrigation: 4SP series, with built-in check valve to prevent backflow impact
Well water extraction in arid regions: Clear water conditions with a sand content of ≤0.01%, SS304 impeller, economical and durable
Industrial processes and building booster
Factory process water transportation, boiler feed water: Multi-stage submersible pumps, 316L impeller to handle mild chemical media
Constant pressure water supply, fire booster: 4SP/6SP series, NEMA standard coupling matched with mainstream motors
Mine drainage: Extraction of corrosive mine water (pH < 4) underground, must use 316 stainless steel cast impeller (Tsurumi SFQ/LH standard)

Radial-flow impeller vs Mixed-flow impeller:
Radial-flow impeller: The liquid flows radially out of the impeller, with high head and moderate flow rate, suitable for deep well high-head scenarios (V4 series, with a head of up to 350m)
Mixed-flow impeller: The liquid flows axially + radially in a combined direction, with large flow rate and moderate head, suitable for large-flow irrigation (V6/V8 series)
Closed impeller vs Semi-open impeller:
Closed impeller: The front and rear covers are sealed, with high efficiency, suitable for clean water deep well pumps (4SP/6SP/8SP/10SP, SP series)
Semi-open impeller: No front cover, with strong anti-clogging ability, suitable for submersible sewage pumps (WQS series)
Impeller fixation method:
Connected to the pump shaft through an SS329 spline coupling (C.R.I. standard)
The impeller and the diffuser (Diffuser) have clearance fit, and the neck ring (Neck Ring) uses SUS304+NBR or SUS316+NBR
Each stage of the impeller is independently dynamic balanced, and the entire pump rotor is done with total dynamic balance

Q: What are the differences between the stainless steel impeller of a submersible pump and that of a slurry pump?
A: Both are centrifugal pump impellers, but the materials are completely opposite: the impeller of the slurry pump is made of high-chromium white iron (A05, HRC ≥ 56), combining "hardness" to resist the abrasive nature of the mineral slurry; the stainless steel impeller of the submersible pump is made of austenitic stainless steel such as SS304/SS316, combining "corrosion resistance + hygiene and safety" to resist corrosive clean water/seawater/chemical liquids. In simple terms: for abrasive conditions, choose the impeller of the slurry pump; for corrosive conditions, choose the stainless steel impeller of the submersible pump.
Q: Why is the impeller of a deep well submersible pump multi-stage?
A: Deep well pumps require high head (up to 620m), a single-stage impeller cannot provide such a high head. Therefore, a multi-stage impeller is used in series - each stage impeller provides a fixed head, and the cumulative number of stages gives the total head. The number of stages of the 4" deep well pump can reach 20-60, and each stage impeller must be precisely dynamic balanced.
Q: Can it be compatible with the motors of Grundfos/Goulds/Franklin?
A: Yes. Our stainless steel impeller couplings comply with NEMA standards, and can be directly matched with the motors of Franklin Electric, Goulds, Grundfos, Pentair, Berkley, etc. RPS Steel Pro 300RPS250-S uses a full 304 stainless steel structure and is compatible with all of the above brands of motors.

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